Air conditioning unit adopting double-working-condition surface air cooler and control method of air conditioning unit

Abstract

The invention discloses an air conditioning unit adopting a double-working-condition surface air cooler and a control method of the air conditioning unit, and relates to the technical field of air conditioning, and the unit comprises the double-working-condition surface air cooler, a filter unit, a fan, a water collecting tray and a box body. The double-working-condition surface air cooler is composed of a double-partition fin type heat exchanger and a valve assembly, wherein the double-partition fin type heat exchanger is provided with a first heat exchange area and a second heat exchange area. Through adjustment of the valve assembly, air conditioner cold and hot water flowing through the first heat exchange area completely or partially or does not flow through the second heat exchange area, the first heat exchange area of the double-partition fin heat exchanger operates under the wet working condition during cooling, and the second heat exchange area operates under the dry working condition. Indoor return air and / or fresh air enters the box body, passes through the filter unit, is cooled or heated by the first heat exchange area and the second heat exchange area of the double-working-condition surface air cooler, is pressurized by the fan, and is sent out by the air supply outlet formed in the box body. The air supply temperature and humidity are adjusted, a reheating device does not need to be arranged, and meanwhile the energy consumption of an air conditioner air and water transmission and distribution system is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner unit adopting a dual-condition surface cooler and a control method thereof. Background Art

[0002] As an air handling terminal device, an air conditioner unit mainly consists of components such as a box body, a filtration unit, a surface cooler, and a fan, and is widely used in commercial, office, hotel, hospital and other places. The air conditioner unit itself does not have a cold and heat source, and it is necessary to send the air conditioning cold and hot water produced by cold and heat source devices such as a chiller, a heat pump unit, and a boiler to the surface cooler of the air conditioner unit through a distribution system. The air conditioner unit makes the air in the area it serves continuously recirculate through the air conditioner unit through a fan. When the air passes through the surface cooler of the air conditioner unit, it absorbs the cold / heat of the cold / hot water flowing through the surface cooler through forced convection heat transfer on the fin surface, and then is cooled / heated to keep the temperature of the area it serves constant.

[0003] With the increasing maturity of low-temperature chiller technology and the popularization of the application of ice storage systems, more and more air conditioning projects will adopt low-temperature cold water systems to achieve the purpose of energy conservation. When the air conditioner unit can adopt low-temperature cold water supply, the lower the cold water supply temperature, the greater the temperature difference between the cold water supply and return, and the more cold capacity can be exchanged per unit water volume. For the same indoor heat load, the required cold water flow will be smaller, the energy consumption of the distribution system will be smaller, the operating cost will be greatly reduced, and the distribution pipeline can be designed according to a smaller specification, thereby reducing the investment cost of the distribution system.

[0004] Currently, the air conditioner unit sets the cold water supply / return temperature at 7.0°C / 12.0°C and the hot water supply / return temperature at 60°C / 50°C. Under the condition of a certain temperature difference between the cold water supply and return, when the water supply temperature of the air conditioner unit increases, the cooling capacity decreases. The higher the water supply temperature, the greater the reduction in cooling capacity, and the dehumidification capacity decreases. When the cold water supply temperature is lower than 7°C, the air supply temperature of the air conditioner unit is too low. When the room humidity is relatively high, it will cause condensation in the room; for a common air conditioner unit without a reheating surface cooler, the air supply temperature and humidity cannot be adjusted simultaneously under the cooling operating mode. Summary of the Invention

[0005] Aiming at the problems existing in the prior art that when using low-temperature cold water supply, the air supply temperature is too low, resulting in room condensation, and for an air conditioner unit adopting a group of surface coolers, the air supply temperature and humidity cannot be adjusted simultaneously under the cooling operation mode, the present invention provides an air conditioner unit adopting a dual-condition surface cooler and a control method thereof.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] An air conditioning unit using a dual-condition surface cooler specifically includes a dual-condition surface cooler, a filtering unit, a fan, a water collecting tray, and a box body. The dual-condition surface cooler consists of a dual-zone finned heat exchanger and a valve assembly. The dual-zone finned heat exchanger includes a first heat exchange zone and a second heat exchange zone, and the first heat exchange zone and the second heat exchange zone are connected through the valve assembly. The valve assembly adjusts the flow rate of the water flowing out of the first heat exchange zone into the second heat exchange zone to regulate the water inlet flow rate of the second heat exchange zone, so that the air-conditioning cold and hot water flowing through the first heat exchange zone of the dual-zone finned heat exchanger can all, partially, or not flow through the second heat exchange zone of the dual-zone finned heat exchanger, realizing that the first heat exchange zone of the dual-zone finned heat exchanger operates under a wet condition during cooling to be responsible for regulating the supply air temperature and humidity, and the second heat exchange zone of the dual-zone finned heat exchanger operates under a dry condition to mainly be responsible for regulating the supply air temperature. Indoor return air and / or fresh air enter the box body through the return air opening and / or fresh air opening provided on the box body. After passing through the filtering unit, it is cooled or heated by the first heat exchange zone and the second heat exchange zone of the dual-condition surface cooler, and after being pressurized by the fan, it is sent out through the air supply opening provided on the box body. During refrigeration, the condensed water generated by the dual-condition surface cooler flows into the water collecting tray and is discharged through the condensed water interface.

[0008] Based on the above technical solution, further, the dual-zone finned heat exchanger includes a first water supply header, a first water return header, a second water supply header, a second water return header, heat exchange tubes, U-shaped tubes, and fins. Among them, the first water supply header, the first water return header, multiple rows of U-shaped coils provided between the first water supply header and the first water return header, and multiple fins arranged approximately equidistantly and parallelly form the first heat exchange zone, which is located in the upper part of the dual-zone finned heat exchanger. One end of the U-shaped coil is connected to the first water supply header, and the other end of the U-shaped coil is connected to the first water return header. The U-shaped coil is formed by sequentially connecting multiple heat exchange tubes and multiple U-shaped tubes end to end in an alternating manner; the second water supply header, the second water return header, multiple rows of U-shaped coils provided between the second water supply header and the second water return header, and multiple fins arranged approximately equidistantly and parallelly form the second heat exchange zone, which is located in the lower part of the dual-zone finned heat exchanger. One end of the U-shaped coil is connected to the second water supply header, and the other end of the U-shaped coil is connected to the second water return header. The U-shaped coil is formed by sequentially connecting multiple heat exchange tubes and multiple U-shaped tubes end to end in an alternating manner. The multiple fins of the first heat exchange zone and the second heat exchange zone are sequentially connected to form a fluid passage for the air flow to pass through. The air-conditioning cold water flowing in the heat exchange tubes cools the air flowing between the fins, and the air-conditioning hot water flowing in the heat exchange tubes heats the air flowing between the fins.

[0009] Based on the above technical solution, further, the first water supply header is provided with a first water inlet joint, the first return water header is provided with a second water outlet interface, the second water supply header is provided with a second water inlet interface, and the second return water header is provided with a first water outlet joint and a third water inlet interface. The air-conditioning chilled and hot water flows into the first water supply header from the first water inlet joint of the dual-zone fin heat exchanger, and evenly flows into each U-shaped coil in the first heat exchange area through the openings on the first water supply header. The air-conditioning chilled and hot water flowing through each U-shaped coil converges into the first return water header through the openings on the first return water header and flows out from the second water outlet interface on the first return water header. The air-conditioning chilled and hot water flowing through the first heat exchange area flows into the second water supply header from the second water inlet interface of the first heat exchange area, and evenly flows into each U-shaped coil in the second heat exchange area through the openings on the second water supply header. The air-conditioning chilled and hot water flowing through each U-shaped coil converges into the second return water header through the openings on the second return water header and flows out from the first water outlet joint of the second return water header.

[0010] Based on the above technical solution, further, the first water supply header, the first return water header, the second water supply header, and the second return water header are made of seamless steel pipes; the heat exchange pipes and U-shaped pipes are made of copper pipes, and the fins are made of aluminum fins. A plurality of tube holes with the same size are evenly opened on the fins, and the fins are installed on the heat exchange pipes through the tube holes. The fins are expanded and connected with the heat exchange pipes by an expanding machine to achieve heat conduction and heat exchange with the heat exchange pipes.

[0011] Based on the above technical solution, further, the area ratio between the first heat exchange area and the second heat exchange area of the dual-zone fin heat exchanger is between 2:1 and 5:1, and the dual-zone fin heat exchanger can adopt one of 4-row pipes, 6-row pipes, and 8-row pipes.

[0012] Based on the above technical solution, further, the valve assembly includes a first regulating valve, a first connecting pipe, a second connecting pipe, and a third connecting pipe, and the first regulating valve adopts an electric three-way regulating valve. The first return water header of the first heat exchange area of the dual-zone fin heat exchanger is connected to the second water supply header of the second heat exchange area through the valve assembly. At the same time, the first return water header of the first heat exchange area is connected to the second return water header of the second heat exchange area through the valve assembly. The specific connection method is that one end of the first connecting pipe of the valve assembly is connected to the second water outlet interface of the first return water header, the other end of the first connecting pipe is connected to the inlet of the DC branch of the first regulating valve, one end of the second connecting pipe of the valve assembly is connected to the bypass branch of the first regulating valve, the other end of the second connecting pipe is connected to the second water supply port on the second water supply header, one end of the third connecting pipe of the valve assembly is connected to the outlet of the DC branch of the first regulating valve, and the other end of the third connecting pipe is connected to the third water inlet interface on the second return water header.

[0013] Based on the above technical solution, further, one or more of a return air fan unit, a water blocking unit, a humidifying unit and a preheating unit are further provided in the box body. When the unit is installed vertically, the fresh air inlet and / or the return air inlet are located at the lower rear part of the box body, the air supply outlet is located at the front or upper part of the box body, and the fan is located above the double-zone finned heat exchanger.

[0014] Based on the above technical solution, further, when in a combined form, the air conditioning unit is composed of functional sections such as a mixing section, a filtering section, a double-zone cooling coil section, and a fan section.

[0015] Based on the above technical solution, further, a controller, a control panel, a humidity sensor, a first temperature sensor, a second temperature sensor, a third temperature sensor, and a second regulating valve are further provided. The first temperature sensor is used to collect the dry bulb temperature of the return air, the humidity sensor is used to collect the relative humidity of the return air, the second temperature sensor is used to collect the dry bulb temperature of the air outlet in the first heat exchange area of the dual-condition cooling coil, the third temperature sensor is used to collect the dry bulb temperature of the supply air, and the second regulating valve is an electric two-way regulating valve, which is used to adjust the flow rate of the air-conditioning chilled / hot water flowing through the dual-condition cooling coil.

[0016] Based on the above technical solution, further, a calculation module and an information processing module are provided inside the controller. The connection mode between the calculation module and the information processing module is a communication connection. The controller and the control panel are connected through a non-polarized power communication interface of twisted pair. The controller is provided with a plurality of I / O interfaces, which are used to connect to the control panel, the first temperature sensor, the second temperature sensor, the third temperature sensor, the humidity sensor, the first regulating valve, the second regulating valve and the fan respectively; the control panel is provided with a display screen and operation buttons. When the control panel is set in a typical room, temperature sensors and humidity sensors are also provided inside the control panel, which are used to collect the indoor temperature and relative humidity of the typical room, and at the same time display the indoor temperature and indoor relative humidity of the typical room. The operation mode, the set dry bulb temperature of the return air, the relative temperature of the return air, or the indoor temperature and indoor relative humidity of the typical room can be set through the control panel.

[0017] Based on the above technical solution, further, the controller controls the opening and closing states of the DC branch and the bypass branch of the first regulating valve according to the parameters set on the on-site control panel, so as to realize the conversion of different operating modes; an information processing module is provided in the controller. According to the set return air temperature and return air relative humidity, or the set indoor temperature and indoor relative humidity of a typical room, the information processing module in the controller automatically compares the measured values and set values of the return air temperature and return air relative humidity, or the measured values and set values of the temperature sensor and humidity sensor set in the typical room, and automatically controls the opening degrees of the DC branch and the bypass branch of the first regulating valve, the opening degree of the second regulating valve, and the rotational speed of the fan, and adjusts the air-conditioning chilled and hot water flow rates and the fan air volume flowing through the first heat exchange area and the second heat exchange area of the dual-condition surface cooler, so as to achieve the purpose of adjusting the indoor temperature and humidity.

[0018] Based on the above technical solution, further, a control method for an air-conditioning unit using a dual-condition surface cooler according to the present invention includes a temperature and humidity dual-control cooling operation mode, a low-temperature chilled water cooling anti-condensation operation mode, a normal-temperature chilled water cooling operation mode, and a heating operation mode. The specific operation modes are described as follows:

[0019] The temperature and humidity dual-control cooling operation mode includes the following steps:

[0020] Step S1: Use the first temperature sensor and the first humidity sensor to collect the return air dry-bulb temperature and return air relative humidity, or use the temperature sensor and humidity sensor set in the control panel of the typical room to collect the indoor temperature and indoor relative humidity of the typical room; use the second temperature sensor to collect the dry-bulb temperature of the air outlet of the first heat exchange area of the dual-condition surface cooler; use the third temperature sensor to collect the supply air dry-bulb temperature of the unit; set the temperature and humidity dual-control cooling operation mode, return air dry-bulb temperature, return air relative temperature or indoor temperature of the typical room, and indoor relative humidity on the control panel.

[0021] Step S2: According to the set return air temperature and return air relative humidity, the calculation module in the controller calculates the return air dew point temperature and return air wet-bulb temperature according to the psychrometric chart, or according to the set indoor temperature and indoor relative humidity of the typical room, the calculation module in the controller calculates the indoor dew point temperature and indoor wet-bulb temperature of the typical room according to the psychrometric chart. The information processing module in the controller receives the return air dew point temperature and return air wet-bulb temperature input by the calculation module, or the indoor temperature and indoor relative humidity of the typical room, and sets the preset temperature of the second temperature sensor and the preset temperature of the third temperature sensor. Further, the preset temperature of the second temperature sensor is 2°C lower than the calculated return air wet-bulb temperature or indoor wet-bulb temperature, and the preset temperature of the third temperature sensor is 2°C higher than the calculated return air dew point temperature or indoor dew point temperature.

[0022] Step S3: The information processing module in the controller sets the first regulating valve to partially open the DC branch and the bypass branch to open inversely proportionally, and the second regulating valve to the preset open state; the fan operates, and the indoor return air and / or fresh air enter the box through the return air inlet and / or fresh air inlet provided on the box. After passing through the filtering unit, it is cooled by the first heat exchange area and the second heat exchange area of the dual-condition cooling coil, pressurized by the fan, and sent out through the air supply outlet provided on the box.

[0023] Step S4: The information processing module of the controller automatically compares the measured value of the third temperature sensor with the preset temperature, and automatically adjusts the opening degree of the bypass branch of the first regulating valve to reduce or increase the flow rate of the chilled water flowing through the second heat exchange area of the dual-condition cooling coil until the measured value of the third temperature sensor reaches the preset temperature; at the same time, the information processing module of the controller automatically compares the measured value of the first temperature sensor with the set value, or the measured value of the indoor temperature in the typical room with the set value. The information processing module in the controller automatically adjusts the opening degree of the second regulating valve and the rotational speed of the fan, adjusts the flow rate of the chilled water flowing through the first heat exchange area of the dual-condition cooling coil and adjusts the air volume of the fan until the return air temperature, return air relative humidity, or the indoor temperature and relative humidity in the typical room reach the set values. And make the supply air temperature of the air conditioning unit 2°C higher than the return air dew point temperature or the indoor dew point temperature to ensure that the supply air does not condense.

[0024] The low-temperature chilled water supply and anti-condensation operation mode includes the following steps:

[0025] Step A1: Use the first temperature sensor and the first humidity sensor to collect the dry bulb temperature and relative humidity of the return air, or use the temperature sensor and humidity sensor set in the control panel of the typical room to collect the indoor temperature and indoor relative humidity of the typical room; use the second temperature sensor to collect the dry bulb temperature of the air outlet of the first heat exchange area of the dual-condition cooling coil; use the third temperature sensor to collect the dry bulb temperature of the supply air of the unit; set the low-temperature chilled water supply and anti-condensation operation mode, the dry bulb temperature of the return air or the indoor temperature of the typical room, and the default value of the relative humidity of the return air or the indoor relative humidity on the control panel to 60%.

[0026] Step A2: According to the set return air temperature and the system default value of 60% for the return air relative humidity, the calculation module in the controller calculates the return air dew point temperature and the return air wet bulb temperature based on the psychrometric chart, or according to the set indoor temperature and the system default value of 60% for the indoor relative humidity of a typical room, the calculation module in the controller calculates the indoor dew point temperature and the indoor wet bulb temperature of the typical room based on the psychrometric chart. The information processing module in the controller receives the return air dew point temperature and the return air wet bulb temperature input by the calculation module, or the indoor temperature and the indoor relative humidity of the typical room, and sets the preset temperature of the second temperature sensor and the preset temperature of the third temperature sensor. Further, the preset temperature of the second temperature sensor is 2°C lower than the calculated return air wet bulb temperature or the indoor wet bulb temperature, and the preset temperature of the third temperature sensor is 2°C higher than the calculated return air dew point temperature or the indoor dew point temperature.

[0027] Step A3: The information processing module in the controller sets the preset state of partially opening the DC branch of the first regulating valve, opening the bypass branch in inverse proportion, and opening the second regulating valve; the fan operates, and the indoor return air and / or fresh air enters the box through the return air inlet and / or fresh air inlet provided on the box body. After passing through the filtering unit, it is cooled by the first heat exchange area and the second heat exchange area of the dual-condition surface cooler, and then sent out through the air supply outlet provided on the box body after being pressurized by the fan.

[0028] Step A4: The information processing module of the controller automatically compares the measured value of the third temperature sensor with the preset temperature, and automatically adjusts the opening degree of the bypass branch of the first regulating valve to reduce or increase the cold water flow rate through the second heat exchange area of the double-zone finned heat exchanger until the measured value of the third temperature sensor reaches the preset temperature; at the same time, the information processing module of the controller automatically compares the measured value of the first temperature sensor with the set value, or the measured value of the indoor temperature of the typical room with the set value. The information processing module in the controller automatically adjusts the opening degree of the second regulating valve and the rotational speed of the fan, adjusts the air-conditioning cold water flow rate through the first heat exchange area of the dual-condition surface cooler and / or adjusts the air volume of the fan until the return air temperature or the indoor temperature of the typical room reaches the set value. The return air relative humidity or the relative humidity of the typical room reaches the system default value of 60%, and the supply air temperature is 2°C higher than the return air dew point temperature or the indoor dew point temperature to ensure that the supply air does not condense.

[0029] The normal temperature chilled water cooling operation mode includes the following steps:

[0030] Step B1: Use the first temperature sensor to collect the dry bulb temperature of the return air, or use the temperature sensor set in the control panel of the typical room to collect the indoor temperature of the typical room; set the normal temperature chilled water cooling operation mode, the return air temperature or the indoor temperature of the typical room on the control panel.

[0031] Step B2: The information processing module in the controller adjusts the first regulating valve to a preset state where the bypass branch is fully open, the direct current branch is closed, and the second regulating valve is open; the fan operates, and the indoor return air and / or fresh air enter the box through the return air inlet and / or fresh air inlet provided on the box body. After passing through the filtering unit, it is cooled by the first heat exchange area and the second heat exchange area of the dual-zone finned heat exchanger, and then sent out through the air supply outlet provided on the box body after being pressurized by the fan.

[0032] Step B3: The information processing module of the controller automatically compares the measured value of the return air temperature with the set value, or the measured value of the indoor temperature in the typical room with the set value. The information processing module of the controller automatically adjusts the opening degree of the second regulating valve and the rotational speed of the fan, adjusts the air-conditioning chilled water flow rate flowing through the dual-condition surface cooler and / or adjusts the air volume of the fan until the return air temperature or the indoor temperature in the typical room reaches the set value.

[0033] The heating operation mode includes the following steps:

[0034] Step 1: Use the first temperature sensor to collect the dry bulb temperature of the return air, or use the temperature sensor set in the control panel of the typical room to collect the indoor temperature of the typical room; set the heating operation mode, the return air temperature or the indoor temperature of the typical room on the control panel.

[0035] Step 2: The information processing module in the controller adjusts the first regulating valve to a preset state where the bypass branch is fully open, the direct current branch is closed, and the second regulating valve is open; the fan operates, and the indoor return air and / or fresh air enter the box through the return air inlet and / or fresh air inlet provided on the box body. After passing through the filtering unit, it is heated by the first heat exchange area and the second heat exchange area of the dual-condition surface cooler, and then sent out through the air supply outlet provided on the box body after being pressurized by the fan.

[0036] Step 3: The information processing module of the controller automatically compares the measured value of the return air temperature with the set value or the measured value of the indoor temperature in the typical room with the set value. The information processing module of the controller automatically adjusts the opening degree of the second regulating valve and the rotational speed of the fan, adjusts the air-conditioning hot water flow rate flowing through the dual-condition surface cooler and / or adjusts the air volume of the fan until the return air temperature or the indoor temperature in the typical room reaches the set value.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1) An air conditioner unit using a dual-mode surface cooler according to the present invention changes the surface cooler in a common air conditioner unit to a dual-mode surface cooler. The dual-mode surface cooler consists of a dual-zone finned heat exchanger and a valve assembly. The dual-mode surface cooler is provided with a first heat exchange zone and a second heat exchange zone, and the first heat exchange zone and the second heat exchange zone are connected by the valve assembly. Through the adjustment of the valve assembly, during refrigeration, the chilled water for air conditioning flowing through the first heat exchange zone of the dual-mode surface cooler can all, partially, or not flow through the second heat exchange zone, enabling the first heat exchange zone of the dual-mode surface cooler to operate under a wet condition to adjust the temperature and humidity of the indoor return air, and the second heat exchange zone to operate under a dry condition to mainly adjust the temperature of the indoor return air. Cold and warm chilled water supply can be adopted to achieve the dual adjustment of the supply air temperature and humidity.

[0039] 2) In an air conditioner unit using a dual-mode surface cooler according to the present invention, the water inlet of the second heat exchange zone of the dual-mode surface cooler is the water outlet of the first heat exchange zone. Therefore, compared with a common air conditioner unit, the supply and return water temperature difference is increased, the air conditioning chilled and hot water flow is reduced, and the energy consumption of the air conditioning chilled and hot water distribution system is greatly reduced.

[0040] 3) An air conditioner unit using a dual-mode surface cooler according to the present invention can achieve the dual adjustment of temperature and humidity with a group of dual-mode surface coolers. In applications with humidity control requirements, there is no need to set up a heat exchange device like a common air conditioner unit, reducing the reheating energy consumption. At the same time, compared with a common air conditioner unit equipped with a reheating device, due to the reduced resistance, the fan energy consumption is reduced.

[0041] 4) A control method for an air conditioner unit using a dual-mode surface cooler according to the present invention can automatically calculate the outlet air temperature of the first heat exchange zone of the dual-mode surface cooler and the supply air temperature of the unit by setting the dry bulb temperature and relative humidity of the return air, or setting the room temperature and room relative humidity. The outlet air temperature of the first heat exchange zone of the dual-mode surface cooler and the supply air temperature of the unit are collected. The first regulating valve can adjust the air conditioning chilled and hot water flow of the first heat exchange zone of the dual-mode surface cooler, and the second regulating valve can adjust the air conditioning chilled and hot water flow of the second heat exchange zone of the dual-mode surface cooler, enabling various operating modes including a dual-control cooling operation mode for temperature and humidity, a low-temperature chilled water supply cooling anti-condensation operation mode, a normal-temperature chilled water supply cooling operation mode, a heating operation mode, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic structural diagram of a horizontal air conditioner unit using a dual-mode surface cooler according to an embodiment of the present invention.

[0043] Figure 2 It is a schematic structural diagram of a dual-mode surface cooler according to an embodiment of the present invention.

[0044] Figure 3 It is a front view of a dual-mode surface cooler according to an embodiment of the present invention.

[0045] Figure 4 This is a side view of a dual-condition surface cooler according to an embodiment of the present invention.

[0046] Figure 5 This is a schematic diagram of a control system of an air-conditioning unit using a dual-condition surface cooler according to an embodiment of the present invention.

[0047] Description of the drawings: 100. Box body; 110. Return air inlet; 120. Fresh air inlet; 130. Air supply outlet; 200. Dual-zone finned heat exchanger; 211. First water inlet joint; 212. First water outlet joint; 213. Second water outlet interface; 214. Second water inlet interface; 215. Third water inlet interface; 221. First water supply header; 222. First water return header; 223. Second water supply header; 224. Second water return header; 231. Heat exchange tube; 232. U-shaped tube; 240. Fins; 251. Left end plate; 252. Right end plate; 253. Upper guard plate; 254. Lower guard plate; 260. First heat exchange area; 270. Second heat exchange area; 300. Valve assembly; 310. First regulating valve; 320. First connecting pipe; 330. Second connecting pipe; 340. Second connecting pipe; 400. Filter unit; 500. Water collection tray; 510. Condensate interface; 600. Fan; 710. Controller; 720. Control panel; 730. Second regulating valve; 740. Humidity sensor; 750. First temperature sensor; 760. Second temperature sensor; 770. Third temperature sensor. Detailed implementation manners

[0048] The present invention will be further described and explained below in conjunction with the drawings and specific implementation manners. The technical features of each implementation manner in the present invention can be combined correspondingly without conflict.

[0049] To make the above objects, features, and advantages of the present invention more obvious and understandable, the specific implementation manners of the present invention will be described in detail below with reference to the drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below. The technical features in each embodiment of the present invention can be combined correspondingly without conflict.

[0050] In the description of the present invention, it should be understood that when an element is considered to be "connected" to another element, it can be directly connected to the other element or indirectly connected, that is, there is an intermediate element. On the contrary, when an element is referred to as being "directly" connected to another element, there is no intermediate element.

[0051] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for the purpose of distinguishing descriptions, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0052] Embodiment

[0053] As Figures 1 - 5 As shown, the basic structure of an air conditioning unit adopting a dual-condition surface cooler includes a box body 100, a dual-condition surface cooler, a filtering unit 400, and a fan 600. The dual-condition surface cooler is composed of a dual-zone fin heat exchanger 200 with two independent heat exchange zones, namely a first heat exchange zone 260 and a second heat exchange zone 270, and a valve assembly 300. The first heat exchange zone 260 and the second heat exchange zone 270 of the dual-zone fin heat exchanger 200 are connected by the valve assembly 300. The valve assembly 300 adjusts the water volume flowing into the second heat exchange zone 270 by adjusting the water flowing out of the first heat exchange zone 260. Through the adjustment of the valve assembly 300, the air-conditioning chilled / hot water flowing through the first heat exchange zone 260 of the dual-zone fin heat exchanger 200 can all, partially flow through, or not flow through the second heat exchange zone 270 of the dual-zone fin heat exchanger 200. When realizing cooling, the first heat exchange zone 260 of the dual-zone fin heat exchanger 200 operates under a wet condition and is responsible for adjusting the supply air temperature and humidity. The second heat exchange zone 270 of the dual-zone fin heat exchanger 200 operates under a dry condition and is mainly responsible for adjusting the supply air temperature. Indoor return air and / or fresh air enter the box body 100 through the return air inlet 110 and the fresh air inlet 120 provided on the box body. After passing through the filtering unit 400, they are cooled or heated by the first heat exchange zone 260 and the second heat exchange zone 270 of the dual-condition surface cooler, and then sent out through the air supply outlet 130 provided on the box body 100 after being pressurized by the fan 600. When refrigerating, the condensed water generated by the dual-condition surface cooler flows into the water collecting tray 500 and is discharged through the condensed water interface 510.

[0054] Furthermore, the double-zone finned heat exchanger 200 includes a first water supply header 221, a first water return header 222, a second water supply header 223, a second water return header 224, heat exchange tubes 231, U-shaped tubes 232, and fins 240. Among them, the first water supply header 221, the first water return header 222, multiple rows of U-shaped coiled pipes disposed between the first water supply header 221 and the first water return header 222, and multiple fins 240 arranged approximately equidistantly and in parallel form a first heat exchange zone 260, which is located at the lower part of the double-zone finned heat exchanger 220. The U-shaped coiled pipes in the first heat exchange zone 260 are formed by sequentially connecting multiple heat exchange tubes 231 and multiple U-shaped tubes 232 end to end in an alternating manner. One end of the U-shaped coiled pipe is connected to the first water supply header 221, and the other end of the U-shaped coiled pipe is connected to the first water return header 222. The second water supply header 223, the second water return header 224, multiple rows of U-shaped coiled pipes disposed between the second water supply header 223 and the second water return header 334, and multiple fins 240 arranged approximately equidistantly and in parallel form a second heat exchange zone 260, which is located at the upper part of the double-zone finned heat exchanger 220. The U-shaped coiled pipes in the second heat exchange zone 270 are formed by sequentially connecting multiple heat exchange tubes 231 and multiple U-shaped tubes 232 end to end in an alternating manner. One end of the U-shaped coiled pipe is connected to the second water supply header 223, and the other end of the U-shaped coiled pipe is connected to the second water return header 224. Multiple fins 240 in the first heat exchange zone 260 and the second heat exchange zone 270 of the double-zone finned heat exchanger 200 are sequentially connected to form a fluid passage for the air flow. The chilled water for air conditioning flowing in the heat exchange tubes 231 cools the air flowing between the fins 240, and the hot water for air conditioning flowing in the heat exchange tubes 231 heats the air flowing between the fins 240.

[0055] Furthermore, the first water supply header 221 is provided with a first water inlet joint 211, the first water return header 222 is provided with a second water outlet interface 213, the second water supply header 223 is provided with a second water inlet interface 214, and the second water return header 224 is provided with a first water outlet joint 212 and a third water inlet interface 215. The chilled and hot water for air conditioning flows into the first water supply header 221 from the first water inlet joint 211, and uniformly flows into each U-shaped coiled pipe in the first heat exchange zone 260 through the openings on the first water supply header 221. The chilled and hot water for air conditioning flowing through each U-shaped coiled pipe converges into the first water return header 222 through the openings on the first water return header 222 and flows out from the second water outlet interface 213 of the first water return header 222. The chilled and hot water for air conditioning flows into the second water supply header 223 from the second water inlet interface 214, and uniformly flows into each U-shaped coiled pipe in the second heat exchange zone 270 through the openings on the second water supply header 223. The chilled and hot water for air conditioning flowing through each U-shaped coiled pipe converges into the second water return header 224 through the openings on the second water return header 224 and flows out from the first water outlet joint 212 of the second water return header 224.

[0056] Furthermore, the double-partition fin heat exchanger 200 is also provided with a left end plate 251, a right end plate 252, an upper guard plate 253, and a lower guard plate 254. Among them, the upper guard plate 253, the lower guard plate 254, the left end plate 251, and the right end plate 252 are formed by bending and are fixedly connected in sequence by bolts at the head and tail, and are arranged on the periphery of the fins 240.

[0057] Furthermore, the first water supply header 221, the first water return header 222, the second water supply header 223, and the second water return header 224 are made of seamless steel pipes, the heat exchange tubes 231 and the U-shaped tubes 232 are made of copper tubes, and the fins 240 are made of aluminum fins. A plurality of tube holes with the same size are evenly formed in the fins 240, and the fins 240 are installed on the heat exchange tubes 231 through the tube holes. The fins 240 are expanded and connected with the heat exchange tubes 231 by an expanding machine to achieve heat conduction and heat exchange with the heat exchange tubes 231.

[0058] Furthermore, the area ratio of the first heat exchange area 260 and the second heat exchange area 270 of the double-partition fin heat exchanger 200 is between 2:1 and 5:1, and one of 4-row tubes, 6-row tubes, and 8-row tubes can be adopted.

[0059] Furthermore, the valve assembly 300 includes a first regulating valve 310, a first connecting pipe 320, a second connecting pipe 330, and a third connecting pipe 340. The first regulating valve 310 is an electric three-way regulating valve. The first return water header 222 of the first heat exchange zone 260 of the dual-zone finned heat exchanger 200 is connected to the second water supply header of the second heat exchange zone 270 through the valve assembly 300. At the same time, the first return water header 222 of the first heat exchange zone 260 is connected to the second return water header 224 of the second heat exchange zone 270 through the valve assembly 300. The specific connection method is as follows: one end of the first connecting pipe 320 of the valve assembly 300 is connected to the second water outlet interface 213 of the first return water header 222, and the other end of the first connecting pipe 320 is connected to the inlet of the DC branch of the first regulating valve 310. One end of the second connecting pipe 320 of the valve assembly 300 is connected to the bypass branch of the first regulating valve 310, and the other end of the second connecting pipe 330 is connected to the second water supply port 214 on the second water supply header 223. One end of the third connecting pipe 340 of the valve assembly 300 is connected to the outlet of the DC branch of the first regulating valve 310, and the other end of the third connecting pipe 340 is connected to the third water inlet interface 215 on the second return water header 224. It realizes that the first return water header 222 of the first heat exchange zone 260 of the dual-zone finned heat exchanger 200 is connected to the second water supply header 223 of the second heat exchange zone 270 through the first connecting pipe 320 of the valve assembly 300, the bypass branch of the first regulating valve 310, and the second connecting pipe 330. At the same time, the first return water header 222 of the first heat exchange zone 260 of the dual-zone finned heat exchanger 200 is connected to the second return water header 224 of the second heat exchange zone 270 through the first connecting pipe 320 of the valve assembly 300, the DC branch of the first regulating valve 310, and the third connecting pipe 340.

[0060] In another specific embodiment of the air conditioner unit using a dual-condition surface cooler according to the present invention, one or more of a return air fan unit, a water retaining unit, a humidifying unit, and a preheating unit are further provided in the cabinet 100, and the rest of the settings are the same as those in this embodiment.

[0061] In another specific embodiment of the air conditioner unit using a dual-condition surface cooler according to the present invention, the unit is installed vertically, the fresh air inlet 120 and / or the return air inlet 110 are located at the lower part of the rear of the cabinet 100, the air supply outlet 130 is located at the front or upper part of the cabinet 100, and the fan 600 is located above the dual-zone finned heat exchanger, and the rest of the settings are the same as those in this embodiment.

[0062] In another specific embodiment of the technical solution of the air conditioner unit using a dual-condition surface cooler according to the present invention, the unit is in a combined form, and the unit is composed of functional sections such as a mixing section, a filtering section, a dual-condition surface cooling section, and a fan section, and the rest of the settings are the same as those in this embodiment.

[0063] Such as Figure 5As shown in the figure, this embodiment is further provided with a controller 710, a control panel 720, a first temperature sensor 750, a second temperature sensor 760, a third temperature sensor 770, a humidity sensor 740, and a second regulating valve 730. The first temperature sensor 750 is arranged at the air return opening 110 of the box body 100 for collecting the dry bulb temperature of the return air; the humidity sensor 740 is arranged at the air return opening 110 of the box body 100 for collecting the relative humidity of the return air. The second temperature sensor 760 is arranged at the air outlet of the first heat exchange area 260 of the dual-condition surface cooler for collecting the dry bulb temperature of the air outlet of the first heat exchange area 260 of the dual-condition coil. The third temperature sensor 770 is arranged at the air supply opening 130 for collecting the dry bulb temperature of the air supply of the unit. The second regulating valve 730 adopts an electric two-way regulating valve for regulating the flow rate of air-conditioning chilled and hot water flowing through the first heat exchange area 260 of the dual-zone finned heat exchanger 200.

[0064] Furthermore, a calculation module and an information processing module are provided inside the controller 710. The connection mode between the calculation module and the information processing module is a communication connection. The controller 710 and the control panel 720 are connected through a non-polarized power communication interface of twisted pair. The controller 710 is provided with a plurality of I / O interfaces for respectively connecting with the control panel 720, the first temperature sensor 750, the second temperature sensor 760, the third temperature sensor 770, the humidity sensor 740, the first regulating valve 310, the second regulating valve 730, and the fan 600; the control panel is provided with a display screen and operation buttons. When the control panel 720 is arranged in a typical room, temperature sensors and humidity sensors are arranged inside the control panel for collecting the indoor temperature and indoor relative humidity of the typical room, and at the same time, displaying the indoor temperature and indoor relative humidity of the typical room. The operation mode, the set return air temperature and return air relative humidity, or the indoor temperature and indoor relative humidity of the typical room can be set through the control panel 720.

[0065] Furthermore, the controller 710 controls the opening and closing states of the DC branch and the bypass branch of the first regulating valve 310 according to the parameters set by the on-site control panel 720 to realize the conversion of different operation modes; an information processing module is provided inside the controller 710. According to the set return air temperature and return air relative humidity, or the set indoor temperature and indoor relative humidity of the typical room, the information processing module inside the controller 710 automatically compares the measured values and set values of the return air temperature and return air relative humidity, or the measured values and set values of the temperature sensors and humidity sensors arranged in the typical room, and automatically controls the opening degrees of the DC branch and the bypass branch of the first regulating valve 310, the opening degree of the second regulating valve 730, and the rotation speed of the fan 600, and sequentially regulates the flow rates of air-conditioning chilled and hot water flowing through the first heat exchange area 260 and the second heat exchange area 270 of the dual-condition surface cooler and the air volume of the fan 600 to achieve the purpose of regulating the indoor temperature and humidity.

[0066] Refer to again Figure 5, A control method for an air conditioning unit using a dual-condition surface cooler according to the present invention is executed on an air conditioning unit using a dual-condition surface cooler in this embodiment. The control method includes a temperature and humidity dual-control cooling operation mode, a low-temperature chilled water cooling anti-condensation operation mode, a normal-temperature chilled water cooling operation mode, and a heating operation mode. The specific operation modes are described as follows:

[0067] 1. When the air conditioning chilled water uses low-temperature chilled water with a temperature below 7°C and normal-temperature chilled water with a temperature above 7°C, and there is a humidity control requirement, the temperature and humidity dual-control cooling operation mode can be adopted, including the following steps:

[0068] Step S1: Use the first temperature sensor 750 and the first humidity sensor 740 to collect the return air dry-bulb temperature and return air relative humidity, or use the temperature sensor and humidity sensor in the control panel 720 set in a typical room to collect the indoor temperature and indoor relative humidity of the typical room; use the second temperature sensor 760 to collect the dry-bulb temperature of the air outlet of the first heat exchange area 260 of the dual-condition surface cooler; use the third temperature sensor 770 to collect the dry-bulb temperature of the supply air of the unit; set the temperature and humidity dual-control cooling operation mode, return air dry-bulb temperature, return air relative temperature, or indoor temperature and indoor relative humidity of the typical room on the control panel 720.

[0069] Step S2: According to the set return air temperature and return air relative humidity, the calculation module in the controller 710 calculates the return air dew point temperature and return air wet-bulb temperature based on the psychrometric chart, or according to the set indoor temperature and indoor relative humidity of the typical room, the calculation module in the controller 710 calculates the indoor dew point temperature and indoor wet-bulb temperature of the typical room. The information processing module in the controller 710 receives the return air dew point temperature and return air wet-bulb temperature input by the calculation module, or the indoor temperature and indoor relative humidity of the typical room, and sets the preset temperature of the second temperature sensor 760 and the preset temperature of the third temperature sensor 770. Further, the preset temperature of the second temperature sensor 760 is 2°C lower than the calculated return air wet-bulb temperature or indoor wet-bulb temperature, and the preset temperature of the third temperature sensor 770 is 2°C higher than the calculated return air dew point temperature or indoor dew point temperature.

[0070] Step S3: The information processing module in the controller 710 partially opens the DC branch of the first regulating valve 310 and inversely opens the bypass branch, and sets the preset state of the second regulating valve 730 to open; the fan 600 operates, and the indoor return air and / or fresh air enter the box body 100 through the return air inlet 110 and / or fresh air inlet 120 provided on the box body. After passing through the filtering unit 400, it is cooled by the first heat exchange area 260 and the second heat exchange area 270 of the dual-condition surface cooler, and then sent out through the air supply outlet 130 provided on the box body 100 after being pressurized by the fan 600.

[0071] Step S4: The information processing module of the controller 710 automatically compares the measured value of the third temperature sensor 770 with the preset temperature, and automatically adjusts the opening degree of the bypass branch of the first regulating valve 310 to reduce or increase the chilled water flow rate passing through the second heat exchange area 270 of the dual-condition surface cooler until the measured value of the third temperature sensor 770 reaches the preset temperature. At the same time, the information processing module of the controller 710 automatically compares the measured value of the first temperature sensor 750 with the set value, or the measured value of the indoor temperature in the typical room with the set value. The information processing module in the controller 710 automatically adjusts the opening degree of the second regulating valve 730 and the rotation speed of the fan 600, adjusts the chilled water flow rate passing through the first heat exchange area 260 of the dual-condition surface cooler and / or adjusts the air volume of the fan 600 until the return air temperature, return air relative humidity, or the indoor temperature and relative humidity in the typical room reach the set values. And make the supply air temperature 2°C higher than the return air dew point temperature or the indoor dew point temperature to ensure that the supply air does not condense.

[0072] 2. When the chilled water for air conditioning uses low-temperature chilled water with a temperature lower than 7°C and there is no humidity control requirement, the low-temperature chilled water supply and condensation prevention operation mode can be adopted, including the following steps:

[0073] Step A1: Use the first temperature sensor 750 and the humidity sensor 740 to collect the return air dry bulb temperature and return air relative humidity, or use the temperature sensor and humidity sensor in the control panel 720 set in the typical room to collect the indoor temperature and indoor relative humidity in the typical room; use the second temperature sensor 760 to collect the dry bulb temperature of the air outlet of the first heat exchange area 260 of the dual-zone finned heat exchanger; use the third temperature sensor 770 to collect the supply air dry bulb temperature of the unit; set the low-temperature chilled water supply and condensation prevention operation mode, return air dry bulb temperature or indoor temperature in the typical room, and the system default value of the return air relative temperature or indoor relative humidity on the control panel 720 is 60%.

[0074] Step A2: According to the set return air temperature and the system default value of 60% for the return air relative humidity, the calculation module in the controller 710 calculates the return air dew point temperature and return air wet bulb temperature according to the psychrometric chart, or according to the set indoor temperature and indoor relative humidity system default value of 60% in the typical room, the calculation module in the controller 710 calculates the indoor dew point temperature and indoor wet bulb temperature in the typical room. The information processing module in the controller 710 receives the return air dew point temperature and return air wet bulb temperature, or the indoor temperature and indoor relative humidity input by the calculation module, and sets the preset temperature of the second temperature sensor 760 and the preset temperature of the third temperature sensor 770. Further, the preset temperature of the second temperature sensor 760 is 2°C lower than the calculated return air wet bulb temperature or indoor wet bulb temperature, and the preset temperature of the third temperature sensor 770 is 2°C higher than the calculated return air dew point temperature or indoor dew point temperature.

[0075] Step A3: The information processing module in the controller 710 sets the preset state where the DC branch of the first regulating valve 310 is partially opened, the bypass branch is opened in inverse proportion, and the second regulating valve 730 is opened; the fan 600 operates, and the indoor return air and / or fresh air enter the box body 100 through the return air opening 110 and the fresh air opening 120 provided on the box body. After passing through the filtering unit 400, it is cooled by the first heat exchange area 260 and the second heat exchange area 270 of the dual-condition surface cooler, and then sent out through the air supply opening 130 provided on the box body 100 after being pressurized by the fan 600.

[0076] Step A4: The information processing module of the controller 710 automatically compares the measured value of the third temperature sensor 770 with the preset temperature, and automatically adjusts the opening degree of the bypass branch of the first regulating valve 310 to reduce or increase the cold water flow rate through the second heat exchange area 270 of the dual-condition surface cooler until the measured value of the third temperature sensor 770 reaches the preset temperature; at the same time, the information processing module of the controller 710 automatically compares the measured value of the first temperature sensor 750 with the set value, or the measured value of the indoor temperature in the typical room with the set value. The information processing module in the controller 710 automatically adjusts the opening degree of the second regulating valve 730 and the rotation speed of the fan 600, adjusts the cold water flow rate through the first heat exchange area 260 of the dual-condition surface cooler and / or adjusts the air volume of the fan 600 until the return air temperature or the indoor temperature in the typical room reaches the set value. The return air relative humidity or the relative humidity in the typical room reaches the system default value of 60%, and the supply air temperature is higher than the return air dew point temperature or the indoor dew point temperature by 2°C to ensure that the supply air does not condense.

[0077] 3. When the air-conditioning chilled water uses normal-temperature chilled water with a temperature higher than 7°C and there is no humidity control requirement, the normal-temperature chilled water cooling operation mode can be adopted, including the following steps:

[0078] Step B1: Use the first temperature sensor 750 to collect the dry bulb temperature of the return air, or use the temperature sensor in the control panel 720 set in the typical room to collect the indoor temperature of the typical room; set the normal-temperature chilled water cooling operation mode, the return air temperature or the indoor temperature of the typical room on the control panel 720.

[0079] Step B2: The information processing module in the controller 710 adjusts the first regulating valve 310 to the preset state where the bypass branch is fully opened and the DC branch is closed, and the second regulating valve 730 is opened; the fan 600 operates, and the indoor return air and / or fresh air enter the box body 100 through the return air opening 110 and / or the fresh air opening 120 provided on the box body. After passing through the filtering unit 400, it is cooled by the first heat exchange area 260 and the second heat exchange area 270 of the dual-condition surface cooler, and then sent out through the air supply opening 130 provided on the box body 100 after being pressurized by the fan 600.

[0080] Step B3: The information processing module of the controller 710 automatically compares the measured value of the return air temperature with the set value, or the measured value of the indoor temperature in the typical room with the set value. The information processing module of the controller 710 automatically adjusts the opening degree of the second regulating valve 730 and the rotation speed of the fan 600, adjusts the air-conditioning chilled water flow rate flowing through the dual-condition cooling coil, and / or adjusts the air volume of the fan 600 until the return air temperature or the indoor temperature in the typical room reaches the set value.

[0081] 4. Heating operation mode, including the following steps:

[0082] Step 1: Use the first temperature sensor 750 to collect the dry bulb temperature of the return air, or use the temperature sensor set in the control panel 720 of the typical room to collect the indoor temperature of the typical room; set the heating operation mode, the return air temperature or the indoor temperature of the typical room on the control panel 720.

[0083] Step 2: The information processing module in the controller 710 adjusts the first regulating valve 310 to the preset state where the bypass branch is fully open, the direct current branch is closed, and the second regulating valve 730 is open; the fan 600 operates, and the indoor return air and / or fresh air enter the box body 100 through the return air opening 110 and / or the fresh air opening 120 provided on the box body. After passing through the filtering unit 400, it is heated by the first heat exchange area 260 and the second heat exchange area 270 of the dual-condition cooling coil, and then sent out through the air supply opening 130 provided on the box body 100 after being pressurized by the fan 600.

[0084] Step 3: The information processing module of the controller 710 automatically compares the measured value of the return air temperature with the set value or the measured value of the indoor temperature in the typical room with the set value. The information processing module of the controller 710 automatically adjusts the opening degree of the second regulating valve 730 and the rotation speed of the fan 600, adjusts the air-conditioning hot water flow rate flowing through the dual-condition cooling coil, and / or adjusts the air volume of the fan 600 until the return air temperature or the indoor temperature in the typical room reaches the set value.

[0085] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than a limitation on the protection scope of the present invention. Any simple modification or equivalent replacement made by those of ordinary skill in the art to the technical solution of the present invention does not depart from the essence and scope of the technical solution of the present invention.

Claims

1. An air conditioning unit using a dual-condition surface cooler, characterized in that, It includes a dual-condition surface cooler, a filtration unit, a fan, a water collecting tray and a box body. The dual-condition surface cooler is composed of a dual-zone finned heat exchanger and a valve assembly. The dual-zone finned heat exchanger includes a first heat exchange zone and a second heat exchange zone. The first heat exchange zone and the second heat exchange zone are connected through the valve assembly. The valve assembly adjusts the flow rate of the water flowing out of the first heat exchange zone into the second heat exchange zone to regulate the water inlet flow rate of the second heat exchange zone, so that all, part or none of the air-conditioning chilled water and hot water flowing through the first heat exchange zone flows through the second heat exchange zone, realizing that the first heat exchange zone of the dual-zone finned heat exchanger operates under wet conditions and the second heat exchange zone operates under dry conditions during cooling. Indoor return air and / or fresh air enter the box body through the return air inlet and / or fresh air inlet provided on the box body. After passing through the filtration unit, it is cooled or heated by the first heat exchange zone and the second heat exchange zone of the dual-condition surface cooler, pressurized by the fan, and sent out through the air supply outlet provided on the box body. During refrigeration, the condensed water generated by the dual-condition surface cooler flows into the water collecting tray and is discharged through the condensed water interface.

2. The air conditioner unit with a dual-condition surface cooler according to claim 1, wherein The dual-zone finned heat exchanger includes a first water supply header, a first water return header, a second water supply header, a second water return header, heat exchange tubes, U-shaped tubes and fins. Among them, the first water supply header, the first water return header, multiple rows of U-shaped coils arranged between the first water supply header and the first water return header and multiple parallel fins form the first heat exchange zone, which is located in the upper part of the dual-zone finned heat exchanger. The U-shaped coils are formed by sequentially connecting multiple heat exchange tubes and multiple U-shaped tubes end to end in an alternating manner. One end of the U-shaped coil is connected to the first water supply header, and the other end of the U-shaped coil is connected to the first water return header. The second water supply header, the second water return header, multiple rows of U-shaped coils arranged between the second water supply header and the second water return header and multiple parallel fins form the second heat exchange zone, which is located in the lower part of the dual-zone finned heat exchanger. The U-shaped coils are formed by sequentially connecting multiple heat exchange tubes and multiple U-shaped tubes end to end in an alternating manner. One end of the U-shaped coil is connected to the second water supply header, and the other end of the U-shaped coil is connected to the second water return header. The multiple fins in the first heat exchange zone and the second heat exchange zone are sequentially connected to form a fluid channel for air flow. The air-conditioning chilled water flowing in the heat exchange tubes cools the air flowing between the fins, and the air-conditioning hot water flowing in the heat exchange tubes heats the air flowing between the fins.

3. The air conditioner unit using a dual-condition surface cooler according to claim 2, characterized in that, The first water supply header is provided with a first water inlet joint, the first return water header is provided with a second water outlet interface, the second water supply header is provided with a second water inlet interface, and the second return water header is provided with a first water outlet joint and a third water inlet interface; The air-conditioning chilled and hot water flows into the first water supply header from the first water inlet joint of the double-zone fin heat exchanger, and evenly flows into each U-shaped coil in the first heat exchange zone through the openings on the first water supply header. The air-conditioning chilled and hot water flowing through each U-shaped coil converges into the first return water header through the openings on the first return water header, and flows out from the second water outlet interface on the first return water header; The air-conditioning chilled and hot water flowing through the first heat exchange zone flows into the second water supply header from the second water inlet interface of the first heat exchange zone, and evenly flows into each U-shaped coil in the second heat exchange zone through the openings on the second water supply header. The air-conditioning chilled and hot water flowing through each U-shaped coil converges into the second return water header through the openings on the second return water header, and flows out from the first water outlet joint of the second return water header.

4. The air conditioner unit adopting a dual-condition surface cooler according to claim 2, characterized in that, The double-zone fin heat exchanger is further provided with a left end plate, a right end plate, an upper guard plate, and a lower guard plate. Among them, the upper guard plate, the front end plate, the lower guard plate, and the rear end plate are formed by bending, and are fixedly connected in sequence by bolts at the head and tail, and are arranged outside the fins; The area ratio of the first heat exchange zone and the second heat exchange zone of the double-zone fin heat exchanger is between 2:1 and 5:1, and the double-zone fin heat exchanger adopts one of 4-row tubes, 6-row tubes, and 8-row tubes; The first water supply header, the first return water header, the second water supply header, and the second return water header are made of seamless steel pipes, and the heat exchange tubes and U-shaped tubes are made of copper tubes; The fins are made of aluminum fins, and a plurality of tube holes with the same size are evenly opened on the fins. The fins are installed on the heat exchange tubes through the tube holes, and the fins are expanded and connected with the heat exchange tubes by an expansion tube machine to realize heat conduction heat exchange with the heat exchange tubes.

5. The air conditioner unit using a dual-condition surface cooler according to claim 3, characterized in that, The valve assembly includes a first regulating valve, a first connecting pipe, a second connecting pipe, and a third connecting pipe. The first regulating valve adopts an electric three-way regulating valve; The first return water header of the first heat exchange zone of the double-zone fin heat exchanger is connected to the second water supply header of the second heat exchange zone through the valve assembly. At the same time, the first return water header of the first heat exchange zone is connected to the second return water header of the second heat exchange zone through the valve assembly; The specific connection method is that one end of the first connecting pipe of the valve assembly is connected to the second water outlet interface of the first return water header, the other end of the first connecting pipe is connected to the inlet of the DC branch of the first regulating valve, one end of the second connecting pipe of the valve assembly is connected to the bypass branch of the first regulating valve, the other end of the second connecting pipe is connected to the second water supply port on the second water supply header, one end of the third connecting pipe of the valve assembly is connected to the outlet of the DC branch of the first regulating valve, and the other end of the third connecting pipe is connected to the third water inlet interface on the second return water header.

6. The air conditioner unit using a dual-condition surface cooler according to claim 1, characterized in that One or more of a return air fan unit, a water blocking unit, a humidifying unit, and a preheating unit are further provided in the box body; When the unit is installed in a vertical form, the fresh air inlet and / or the return air inlet are located at the lower rear part of the box body, the air supply outlet is located at the front part or the upper part of the box body, and the fan is located above the double-zone fin heat exchanger.

7. An air conditioner unit using a dual-condition surface cooler according to claim 1, characterized in that, When the air-conditioning unit is in a combined form, the air-conditioning unit is composed of a mixing section, a filtering section, a dual-conditioning surface cooler section, and a fan section.

8. An air conditioning unit using a dual-condition surface cooler according to claim 1, characterized in that, It also includes a controller, a control panel, a humidity sensor, a first temperature sensor, a second temperature sensor, a third temperature sensor, and a second regulating valve. The first temperature sensor is used to collect the return air dry-bulb temperature, the humidity sensor is used to collect the return air relative humidity, the second temperature sensor is used to collect the dry-bulb temperature of the outlet air of the first heat exchange area of the dual-condition surface cooler, the third temperature sensor is used to collect the supply air dry-bulb temperature, and the second regulating valve is an electric two-way regulating valve, which is used to regulate the flow rate of air-conditioning chilled / hot water flowing through the first heat exchange area of the dual-condition surface cooler.

9. The air conditioner unit using a dual-condition surface cooler according to claim 8, wherein, The controller is internally provided with a calculation module and an information processing module. The connection mode between the calculation module and the information processing module is a communication connection. The controller and the control panel are connected through a non-polarized powered communication interface of twisted pair. The controller is provided with a plurality of I / O interfaces, which are used to be connected to the control panel, the first temperature sensor, the second temperature sensor, the third temperature sensor, the humidity sensor, the first regulating valve, the second regulating valve, and the fan respectively; the control panel is provided with a display screen and operation buttons. When the control panel is set in a typical room, the control panel is also provided with a temperature sensor and a humidity sensor, which are used to collect the indoor temperature and indoor relative humidity of the typical room, and at the same time display the indoor temperature and indoor relative humidity of the typical room. The operation mode, the set return air dry-bulb temperature, the return air relative temperature, or the indoor temperature and indoor relative humidity of the typical room are set through the control panel.

10. A control method for an air conditioning unit using a dual-condition surface cooler, which is applied to an air conditioning unit using a dual-condition surface cooler according to any one of claims 1-9, characterized in that, The control methods include a temperature and humidity dual-control cooling operation mode, a low-temperature chilled water cooling anti-condensation operation mode, a normal-temperature chilled water cooling operation mode, and a heating operation mode. The operation modes are described as follows: The temperature and humidity dual-control cooling operation mode includes the following steps: Step S1: Use the first temperature sensor and the humidity sensor to collect the return air dry-bulb temperature and the return air relative humidity, or use the temperature sensor and the humidity sensor set in the control panel of the typical room to collect the indoor temperature and indoor relative humidity of the typical room; use the second temperature sensor to collect the dry-bulb temperature of the outlet air of the first heat exchange area of the dual-condition surface cooler; use the third temperature sensor to collect the supply air dry-bulb temperature of the unit; set the temperature and humidity dual-control cooling operation mode, the return air dry-bulb temperature, the return air relative temperature, or the indoor temperature and indoor relative humidity of the typical room on the control panel; Step S2: According to the set return air temperature and return air relative humidity, the calculation module in the controller calculates the return air dew point temperature and return air wet-bulb temperature according to the psychrometric chart, or according to the set indoor temperature and indoor relative humidity of the typical room, the calculation module in the controller calculates the indoor dew point temperature and indoor wet-bulb temperature of the typical room; the information processing module in the controller receives the return air dew point temperature and return air wet-bulb temperature input by the calculation module, or the indoor temperature and indoor relative humidity of the typical room, and sets the preset temperature of the second temperature sensor and the preset temperature of the third temperature sensor. Among them, the preset temperature of the second temperature sensor is 2°C lower than the calculated return air wet-bulb temperature or indoor wet-bulb temperature, and the preset temperature of the third temperature sensor is 2°C higher than the calculated return air dew point temperature or indoor dew point temperature; Step S3: The information processing module in the controller sets the preset state where the DC branch of the first regulating valve is partially opened, the bypass branch is opened inversely, and the second regulating valve is opened; the fan operates, and the indoor return air and / or fresh air enter the box through the return air inlet and / or fresh air inlet provided on the box. After passing through the filtering unit, it is cooled by the first heat exchange area and the second heat exchange area of the dual-condition cooler, pressurized by the fan, and then sent out through the air supply outlet provided on the box. Step S4: The information processing module of the controller automatically compares the measured value of the third temperature sensor with the preset temperature, and automatically adjusts the opening degree of the bypass branch of the first regulating valve to reduce or increase the flow rate of chilled water for air conditioning flowing through the second heat exchange area of the dual-condition cooler until the measured value of the third temperature sensor reaches the preset temperature; at the same time, the information processing module of the controller automatically compares the measured value of the first temperature sensor with the set value, or the measured value of the indoor temperature in the typical room with the set value. The information processing module in the controller automatically adjusts the opening degree of the second regulating valve and the rotational speed of the fan, adjusts the flow rate of chilled water for air conditioning flowing through the first heat exchange area of the dual-condition cooler and adjusts the air volume of the fan until the return air temperature, return air relative humidity, or the indoor temperature and relative humidity in the typical room reach the set values, and makes the supply air temperature of the air conditioning unit higher than the return air dew point temperature or the indoor dew point temperature by 2°C to ensure that the supply air does not condense. The low-temperature chilled water supply and anti-condensation operation mode includes the following steps: Step A1: Use the first temperature sensor and the first humidity sensor to collect the dry bulb temperature and relative humidity of the return air, or use the temperature sensor and humidity sensor set in the control panel of the typical room to collect the indoor temperature and indoor relative humidity of the typical room; use the second temperature sensor to collect the dry bulb temperature of the air outlet of the first heat exchange area of the dual-condition cooler; use the third temperature sensor to collect the dry bulb temperature of the supply air of the unit; set the low-temperature chilled water supply and anti-condensation operation mode, the dry bulb temperature of the return air or the indoor temperature of the typical room, and the default value of the relative humidity of the return air or indoor relative humidity on the control panel to 60%. Step A2: According to the set default value of 60% for the return air temperature and return air relative humidity, the calculation module in the controller calculates the return air dew point temperature and return air wet bulb temperature according to the psychrometric chart, or according to the set default value of 60% for the indoor temperature and indoor relative humidity of the typical room, the calculation module in the controller calculates the indoor dew point temperature and indoor wet bulb temperature of the typical room according to the psychrometric chart; the information processing module in the controller receives the return air dew point temperature and return air wet bulb temperature, or the indoor temperature and indoor relative humidity input by the calculation module, and sets the preset temperature of the second temperature sensor and the preset temperature of the third temperature sensor. Among them, the preset temperature of the second temperature sensor is 2°C lower than the calculated return air wet bulb temperature or indoor wet bulb temperature, and the preset temperature of the third temperature sensor is 2°C higher than the calculated return air dew point temperature or indoor dew point temperature. Step A3: The information processing module in the controller sets the first regulating valve to partially open the DC branch and inversely open the bypass branch, and the second regulating valve to the preset open state; the fan operates, and indoor return air and / or fresh air enter the box through the return air inlet and / or fresh air inlet provided on the box. After passing through the filter unit, it is cooled by the first heat exchange area and the second heat exchange area of the dual-condition cooling coil, pressurized by the fan, and sent out through the air supply outlet provided on the box. Step A4: The information processing module of the controller automatically compares the measured value of the third temperature sensor with the preset temperature, and automatically adjusts the opening degree of the bypass branch of the first regulating valve to reduce or increase the cold water flow rate through the second heat exchange area of the double-zone finned heat exchanger until the measured value of the third temperature sensor reaches the preset temperature; at the same time, the information processing module of the controller automatically compares the measured value of the first temperature sensor with the set value, or the measured value of the indoor temperature in the typical room with the set value. The information processing module in the controller automatically adjusts the opening degree of the second regulating valve and the speed of the fan, adjusts the air-conditioning cold water flow rate through the first heat exchange area of the dual-condition cooling coil and / or adjusts the air volume of the fan until the return air temperature or the indoor temperature in the typical room reaches the set value; the return air relative humidity or the relative humidity in the typical room reaches the system default value of 60%, and the supply air temperature is higher than the return air dew point temperature or the indoor dew point temperature by 2°C to ensure that the supply air does not condense. The normal temperature cold water cooling operation mode includes the following steps: Step B1: Use the first temperature sensor to collect the dry bulb temperature of the return air, or use the temperature sensor set in the control panel of the typical room to collect the indoor temperature of the typical room; set the normal temperature cold water cooling operation mode, the return air temperature or the indoor temperature of the typical room on the control panel. Step B2: The information processing module in the controller adjusts the first regulating valve to the preset state where the bypass branch is fully open and the DC branch is closed, and the second regulating valve is open; the fan operates, and indoor return air and / or fresh air enter the box through the return air inlet and / or fresh air inlet provided on the box. After passing through the filter unit, it is cooled by the first heat exchange area and the second heat exchange area of the double-zone finned heat exchanger, pressurized by the fan, and sent out through the air supply outlet provided on the box. Step B3: The information processing module of the controller automatically compares the measured value of the return air temperature with the set value, or the measured value of the indoor temperature in the typical room with the set value. The information processing module of the controller automatically adjusts the opening degree of the second regulating valve and the speed of the fan, adjusts the air-conditioning cold water flow rate through the dual-condition cooling coil and / or adjusts the air volume of the fan until the return air temperature or the indoor temperature in the typical room reaches the set value. The heating operation mode includes the following steps: Step 1: Use the first temperature sensor to collect the dry bulb temperature of the return air, or use the temperature sensor set in the control panel of the typical room to collect the indoor temperature of the typical room; set the heating operation mode, the return air temperature or the indoor temperature of the typical room on the control panel. Step 2: The information processing module in the controller adjusts the first regulating valve to the preset state where the bypass branch is fully open, the direct current branch is closed, and the second regulating valve is open; the fan operates, and the indoor return air and / or fresh air enter the box body through the return air inlet and / or fresh air inlet provided on the box body. After passing through the filtering unit, it is heated by the first heat exchange area and the second heat exchange area of the dual-condition surface cooler, and then sent out through the air supply outlet provided on the box body after being pressurized by the fan; Step 3: The information processing module of the controller automatically compares the measured value of the return air temperature with the set value or the measured value of the indoor temperature in the typical room with the set value. The information processing module of the controller automatically adjusts the opening degree of the second regulating valve and the rotational speed of the fan, adjusts the air-conditioning hot water flow rate flowing through the dual-condition surface cooler and / or adjusts the air volume of the fan until the return air temperature or the indoor temperature in the typical room reaches the set value.

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