Intelligent control method of heat recovery fresh air conditioning system

Abstract

According to the technical scheme, the intelligent control method is characterized in that an air conditioning box is included, a fresh air channel and an exhaust channel are arranged in the air conditioning box, the intelligent control system further comprises a heat recovery rotating wheel rotating in the fresh air channel and the exhaust channel, and an air feeder and an electric bypass air valve are arranged in the fresh air channel; an exhaust fan is arranged in the exhaust channel, the intelligent controller collects real-time operation parameters and air parameters of all equipment, and the intelligent controller controls operation parameters of the air feeder, the exhaust fan and the heat recovery rotating wheel according to total heat recovery efficiency and energy consumption data; efficient operation and energy-saving effects of the air conditioning system are achieved through intelligent linkage operation regulation and control of independent systems such as fresh air, exhaust air and the rotating wheel, the intelligent regulator optimizes starting, stopping and rotating speed control of the heat recovery rotating wheel and the air feeder by analyzing total heat recovery efficiency and energy consumption data, and therefore the energy utilization efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat recovery, and more specifically, it relates to an intelligent control method for a heat recovery fresh air air conditioning system. Background Art

[0002] Rotary heat recovery fresh air air conditioning units are widely used in various indoor air treatment occasions such as high-rise buildings, shopping malls, supermarkets, hotels, conference rooms, etc., as well as in waste heat recovery scenarios in industrial production. Especially in environments with high-temperature exhaust gas, such as drying equipment, painting workshops, etc., it can effectively recover the heat energy in industrial waste gas and reduce energy consumption.

[0003] However, the current heat recovery air conditioning units can only operate inefficiently and simply: after the rotary heat recovery air conditioning box unit starts, the fan operates at power frequency, and the rotary wheel also starts to operate accordingly. The control system does not coordinate the balance between various components or efficiently utilize heat recovery and natural cold and heat sources, and does not tap the heat recovery efficiency of the heat recovery air conditioning box unit. Therefore, a dedicated control method has been developed for such systems. Summary of the Invention

[0004] To solve the above problems, the present invention provides the following technical solutions:

[0005] An intelligent control method for a heat recovery fresh air air conditioning system, including an air conditioning box, in which a fresh air channel and an exhaust air channel are provided. It also includes a heat recovery rotary wheel rotating in the fresh air channel and the exhaust air channel. A supply fan and an electric bypass air valve are provided in the fresh air channel, and an exhaust fan is provided in the exhaust air channel. It further includes an intelligent regulator, which collects the real-time operating parameters of each device and air parameters, and the intelligent regulator controls the operating parameters of the supply fan, exhaust fan and heat recovery rotary wheel according to the total heat recovery efficiency and energy consumption data.

[0006] The present invention is further configured as follows: The intelligent regulator includes an input end, an output end and an information collection end. The input end collects the real-time operating parameters of each device, including the status feedback of the supply fan, exhaust fan, heat recovery rotary wheel and electric bypass air valve. The output end is used to control the operating status of each device, including the start-stop and speed control of the supply fan, exhaust fan and heat recovery rotary wheel, and the opening control of the electric bypass air valve. The information collection end is used to collect the personnel density information and air parameters.

[0007] The present invention is further configured as follows: The total heat recovery efficiency where h1 is the enthalpy value of the fresh air before passing through the heat recovery rotary wheel, h2 is the enthalpy value of the fresh air after heat recovery through the heat recovery rotary wheel, h3 is the enthalpy value of the exhaust air, and the enthalpy value is calculated by the intelligent regulator through the temperature and humidity of the real-time monitored air parameters. When the total heat recovery efficiency is relatively high, the rotary wheel speed is appropriately increased.

[0008] The present invention is further configured such that when the power P of the exhaust fan 排 <The heat recovery power P 全 is reached, the exhaust fan is turned off and the electric bypass air valve is opened.

[0009] The present invention is further configured such that the heat recovery power The Q 全 is the total heat recovery amount = η × ρ × min(L1, L3) × (h3 - h1), where: ρ is the air density, L1 is the fresh air volume, L3 is the exhaust air volume, and min(L1, L3) is the smaller value of the fresh air volume and the exhaust air volume.

[0010] The present invention is further configured such that the fresh air passage has a filter section, a surface cooler section, and a heating section. A surface cooler valve and a hot water valve connected to the intelligent controller are respectively provided on the surface cooler section and the heating section. The heat recovery runner is provided with a moisture absorption coating and has a humidity recovery function.

[0011] The present invention is further configured such that the intelligent controller controls the ratio between the fresh air volume Qoa and the exhaust air volume Qex according to the supply fan and the exhaust fan as: Qoa = (0.8 - 1.2)Qex.

[0012] The present invention is further configured such that the intelligent controller has a refrigeration control mode, and the refrigeration control mode includes adjusting the opening degree of the surface cooler valve according to the temperature and increasing the fresh air volume and the exhaust air volume according to the personnel density information.

[0013] The present invention is further configured such that the intelligent controller has a heating control mode, and the heating control mode includes adjusting the opening degree of the hot water valve according to the temperature and reducing the fresh air volume and the exhaust air volume.

[0014] The present invention is further configured such that the intelligent controller has a supply air control mode, and the supply air control mode includes closing the surface cooler valve and the hot water valve and opening the electric bypass air valve.

[0015] Compared with the prior art, the present invention has at least the following advantages:

[0016] 1. The present invention is applicable to the air conditioning system of a runner heat recovery fresh air air handling unit. Through the intelligent linkage operation control of independent systems such as fresh air, exhaust air, and runner, the efficient operation and energy-saving effect of the air conditioning system are realized. The intelligent controller optimizes the start-stop and speed control of the heat recovery runner and the supply fan by analyzing the total heat recovery efficiency and energy consumption data, thereby improving the energy utilization efficiency.

[0017] 2. The intelligent controller adjusts the coupled linkage control logic of the fresh air system and the exhaust system by obtaining the air temperature and humidity parameters and according to the personnel density in the air-conditioned area. On the basis of improving the indoor air quality, it optimizes the operating state of the air-conditioning system, realizes the utilization of the residual cold of the exhaust air by the air-conditioning system and the precise control of the fresh air supply volume, and reduces the energy consumption of the fresh air system. Description of the Drawings

[0018] Figure 1 is the schematic diagram of the air handling unit in this embodiment;

[0019] Figure 2 is the control system diagram of this embodiment.

[0020] Description of the Reference Numerals:

[0021] 1. Exhaust fan; 2. Heat recovery runner; 3. Electric fresh air valve; 4. Electric bypass air valve; 5. Filter section; 6. Cooling coil section; 7. Heating section; 8. Supply fan. Detailed Embodiments

[0022] To make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] An intelligent control method for a heat recovery fresh air air-conditioning system, as Figure 1 And Figure 2As shown in the figure, it includes an air handling unit. A fresh air passage and an exhaust air passage are arranged inside the air handling unit. It also includes a heat recovery runner 2 that rotates in the fresh air passage and the exhaust air passage. A supply fan 8 and an electric bypass air valve 4 are arranged in the fresh air passage, and an exhaust fan 1 is arranged in the exhaust air passage. It further includes an intelligent controller that collects the real-time operation parameters of each device and air parameters. The intelligent controller controls the operation parameters of the supply fan 8, the exhaust fan 1, and the heat recovery runner 2 according to the total heat recovery efficiency and energy consumption data. Through the intelligent linkage operation control of independent systems such as fresh air, exhaust air, and runner, the efficient operation and energy-saving effect of the air conditioning system are realized, thereby improving the energy utilization efficiency.

[0025] The two ends of the fresh air passage are a fresh air inlet and a supply air outlet respectively. Outdoor air enters the fresh air passage through the fresh air inlet and then enters the room through the supply air outlet. The two ends of the exhaust air passage are a return air inlet and an exhaust air outlet respectively. Indoor air enters the exhaust air passage through the return air inlet and is discharged outdoors through the exhaust air outlet. The fresh air passage and the exhaust air passage are separated by a partition, and the heat recovery runner 2 is located in both the fresh air passage and the exhaust air passage at the same time. When the exhaust air (i.e., the waste gas in the room) flows through the heat recovery runner 2, the heat recovery runner 2 will absorb the heat in the exhaust air, the temperature of the exhaust air decreases, and the temperature of the core body increases. As the heat recovery runner 2 rotates, the part that has absorbed heat will enter the supply air area (i.e., the fresh air passage). Here, the heat recovery runner 2 releases the previously absorbed heat into the fresh air flow, thereby preheating the fresh air (pre-cooling in summer and pre-heating in winter).

[0026] The intelligent controller includes an input end, an output end, and an information collection end. The input end collects the real-time operation parameters of each device, including the status feedback of the supply fan 8, the exhaust fan 1, the heat recovery runner 2, and the electric bypass air valve 4. The output end is used to control the operation status of each device, including the start-stop and speed control of the supply fan 8, the exhaust fan 1, and the heat recovery runner 2, and the opening control of the electric bypass air valve 4. The information collection end is used to collect the personnel density information and air parameters.

[0027] Among them, the air parameters include the fresh air temperature and humidity (fresh air that has not passed through the heat recovery runner 2), the supply air temperature and humidity (fresh air that has passed through the heat recovery runner 2), the return air temperature and humidity (exhaust air that has not passed through the heat recovery runner 2), the exhaust air temperature and humidity (exhaust air that has passed through the heat recovery runner 2), as well as the temperature and humidity of the indoor and outdoor air. The personnel density information is obtained through the installed infrared array sensor, and the air parameters are obtained through the temperature and humidity sensors installed at the outdoor fresh air inlet and inside.

[0028] The total heat recovery efficiency Among them, h1 is the enthalpy value of the fresh air before passing through the heat recovery runner 2, h2 is the enthalpy value of the fresh air after heat recovery through the heat recovery runner 2, and h3 is the enthalpy value of the exhaust air. The enthalpy value is calculated by the intelligent controller through the temperature and humidity of the real-time monitored air parameters. When the total heat recovery efficiency is relatively low, the rotation speed of the heat recovery runner 2 is appropriately increased to enhance the heat recovery effect. Specifically, when the total heat recovery efficiency is greater than 65% or lower than 50%, it can be considered relatively low, and the heat recovery runner 2 is adjusted by 5% each time. If the rotation speed is increased by 5% and the total heat recovery efficiency increases, the rotation speed can be further increased; if the total heat recovery efficiency decreases, the rotation speed is decreased, so as to find the highest point of the total heat recovery efficiency and the corresponding runner rotation speed.

[0029] When the power P of the exhaust fan 1 排 <Heat recovery power P 全 At this time, it means that the energy recovered by heat is not enough to offset the energy consumption of the exhaust fan 1. At this time, the energy consumption is too high, and heat recovery is not carried out. The exhaust fan 1 is turned off and the electric bypass air valve 4 is opened.

[0030] The heat recovery power Q 全 =η×ρ×min(L1, L3)×(h3 - h1), where: Q 全 Is the total heat recovery amount, kJ / h; ρ is the air density, ρ≈1.2kg / m3; L1 is the fresh air volume, m 3 ; L3 is the exhaust air volume, m 3 ; min(L1, L3) is the smaller value of the fresh air volume and the exhaust air volume.

[0031] The electric fresh air valve 3 and the heat recovery runner 2 are arranged side by side in the fresh air passage, and the orientation of the electric fresh air valve 3 coincides with the air supply direction. The fresh air passage has a filter section 5, a surface cooler section 6 and a heating section 7. A surface cooler valve and a hot water valve connected to the intelligent controller are respectively arranged on the surface cooler section 6 and the heating section 7. The intelligent controller adjusts the refrigeration and heating intensity by controlling the opening degrees of the surface cooler valve and the hot water valve.

[0032] An electric fresh air valve 3 is arranged at the fresh air inlet. The electric fresh air valve 3 is connected to the intelligent controller, and the total fresh air inlet volume of the fresh air passage is adjusted by controlling the opening degree of the electric fresh air valve 3.

[0033] The heat recovery runner 2 is a rotating wheel with a honeycomb structure and can be made of aluminum alloy, galvanized steel or other corrosion-resistant materials. In addition to heat recovery, the heat recovery runner 2 is also provided with a moisture absorption coating and has a humidity recovery function. In winter, this can reduce the need for fresh air humidification, and in summer, it can reduce the humidity burden of fresh air.

[0034] The intelligent controller controls the ratio between the fresh air volume Qoa and the exhaust air volume Qex according to the air supply fan 8 and the exhaust fan 1 as: Qoa = (0.8 - 1.2)Qex. That is, the fresh air volume Qoa is 0.8 to 1.2 times the exhaust air volume Qex.

[0035] The specific ratio value can be set in the intelligent controller according to the air-conditioning use environment. It is dynamically adjusted according to the indoor space function, personnel density, and air quality requirements. For example, in crowded places such as meeting rooms and shopping malls, the proportion of fresh air volume is appropriately increased to meet the personnel's demand for fresh air; in areas with fewer people, the fresh air volume can be appropriately reduced to improve the total heat recovery efficiency and reduce energy consumption.

[0036] The intelligent controller has a cooling control mode, which is applicable to meeting the indoor cooling demand in summer. The cooling control mode includes adjusting the opening degree of the surface cooler valve according to the air temperature to cool and dehumidify the fresh air, and increasing the fresh air volume and the exhaust air volume according to the personnel density information.

[0037] According to the indoor personnel density situation and the air quality detection data, the fresh air volume and the exhaust air volume are dynamically adjusted. When the number of indoor personnel increases and the CO2 concentration rises, the fresh air introduction volume is increased, and at the same time, the exhaust air volume is correspondingly increased to maintain the indoor air quality and pressure balance.

[0038] In the cooling control mode, when the total heat recovery efficiency is lower than the set threshold (such as 60%), the runner speed is automatically adjusted or the operation mode is switched to improve the heat recovery effect.

[0039] The intelligent controller has a heating control mode, which is applicable to meeting the indoor temperature comfort demand in winter. The heating control mode includes adjusting the opening degree of the hot water valve according to the air temperature to heat and raise the temperature of the fresh air, and reducing the fresh air volume and the exhaust air volume.

[0040] Considering the large temperature difference between indoor and outdoor in winter, the fresh air volume is appropriately reduced to reduce heat loss, but it is necessary to ensure that the fresh air volume meets the basic needs of indoor personnel to prevent the indoor air quality from deteriorating due to insufficient fresh air.

[0041] In the heating control mode, the heat in the exhaust air is transferred to the fresh air through the heat recovery runner 2 to increase the temperature of the fresh air and reduce the heating energy consumption. By real-time monitoring the total heat recovery efficiency, when the efficiency is not good, the operation parameters of the heat recovery runner 2 are optimized, such as adjusting the speed, cleaning the heat recovery runner 2, etc.

[0042] The intelligent controller has a air supply control mode, which is applicable when the outdoor temperature and humidity are appropriate in the transitional season. The air supply control mode includes closing the surface cooler valve and the hot water valve, and opening the electric bypass air valve 4 to improve the air supply efficiency and make full use of the natural cold source or heat source.

[0043] In other embodiments, the air supply control mode can also flexibly adjust the fresh air volume and the exhaust air volume according to outdoor meteorological conditions and indoor air quality. When the outdoor air quality is good, increase the fresh air volume to improve the indoor air environment; when the outdoor air quality is poor, reduce the fresh air volume and strengthen the air purification treatment.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the design concept of the present invention shall be included within the protection scope of the present invention.

Claims

1. An intelligent control method for a heat recovery fresh air air-conditioning system, characterized in that: It includes an air handling unit, in which a fresh air passage and an exhaust air passage are provided. It also includes a heat recovery wheel rotating in the fresh air passage and the exhaust air passage. A supply fan and an electric bypass air valve are provided in the fresh air passage, and an exhaust fan is provided in the exhaust air passage. It further includes an intelligent controller which collects the real-time operation parameters of each device and air parameters, and controls the operation parameters of the supply fan, the exhaust fan and the heat recovery wheel according to the total heat recovery efficiency and energy consumption data.

2. The intelligent control method of a heat recovery fresh air air conditioning system according to claim 1, characterized in that: The intelligent controller includes an input end, an output end and an information collection end. The input end collects the real-time operation parameters of each device, including the status feedback of the supply fan, the exhaust fan, the heat recovery wheel and the electric bypass air valve. The output end is used to control the operation status of each device, including the start-stop and speed control of the supply fan, the exhaust fan and the heat recovery wheel, and the opening control of the electric bypass air valve. The information collection end is used to collect the personnel density information and air parameters.

3. The intelligent control method of a heat recovery fresh air air-conditioning system according to claim 2, characterized in that: The total heat recovery efficiency where h1 is the enthalpy value of the fresh air before passing through the heat recovery runner, h2 is the enthalpy value of the fresh air after heat recovery through the heat recovery runner, h3 is the enthalpy value of the exhaust air, and the enthalpy value is calculated by the intelligent controller through real-time monitoring of the temperature and humidity of the air parameters. When the total heat recovery efficiency is lower than 50%, the rotation speed of the heat recovery runner is increased.

4. The intelligent control method of a heat recovery fresh air air-conditioning system according to claim 3, characterized in that: When the power P of the exhaust fan 排 <the heat recovery power P 全 is reached, turn off the exhaust fan and open the electric bypass air valve.

5. The intelligent control method of a heat recovery fresh air air-conditioning system according to claim 4, characterized in that: The heat recovery power The Q 全 The total heat recovery amount = η × ρ × min(L1, L3) × (h3 - h1), where: ρ is the air density, L1 is the fresh air volume, L3 is the exhaust air volume, and min(L1, L3) is the smaller value between the fresh air volume and the exhaust air volume.

6. The intelligent control method of a heat recovery fresh air air-conditioning system according to claim 2, characterized in that: The fresh air passage has a filtration section, a cooling coil section and a heating section. A cooling coil valve and a hot water valve connected to the intelligent controller are respectively provided on the cooling coil section and the heating section. The heat recovery wheel is provided with a moisture absorption coating and has a humidity recovery function.

7. The intelligent control method of a heat recovery fresh air air-conditioning system according to claim 6, characterized in that: The intelligent controller controls the ratio between the fresh air volume Qoa and the exhaust air volume Qex according to the supply fan and the exhaust fan as: Qoa = (0.8 - 1.2)Qex.

8. The intelligent control method of a heat recovery fresh air air-conditioning system according to claim 7, characterized in that: The intelligent controller has a refrigeration control mode, which includes adjusting the opening of the cooling coil valve according to the air temperature and increasing the fresh air volume and the exhaust air volume according to the personnel density information.

9. The intelligent control method of a heat recovery fresh air air - conditioning system according to claim 7, characterized in that: The intelligent controller has a heating control mode, which includes adjusting the opening of the hot water valve according to the air temperature and reducing the fresh air volume and the exhaust air volume.

10. The intelligent control method of a heat recovery fresh air air-conditioning system according to claim 7, characterized in that: The intelligent controller has a supply air control mode, which includes closing the cooling coil valve and the hot water valve and opening the electric bypass air valve.

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