A dual-air duct evaporation adjustment device

Abstract

The present invention discloses a dual-air duct evaporation adjustment device, which includes an evaporator, a main air duct, an auxiliary air duct, a damper regulator, a heating unit, a fan, etc. The evaporator is formed by an upper part and a lower part to form a combination. The upper part is the main evaporator, which is mainly used for cooling the air temperature to control the dry bulb temperature, and the lower part is the auxiliary evaporator, which is mainly used for condensing the air moisture to control the wet bulb temperature. The main evaporator is located in the main air duct, and the auxiliary evaporator is located in the auxiliary air duct. The auxiliary air duct is connected directly below the main air duct. There are 3 holes between the main air duct and the auxiliary air duct. The middle hole is used for passing through the evaporator. The hole on the leeward side of the evaporator is the bypass air outlet, and the hole on the windward side of the evaporator is the bypass air inlet. The damper regulator is provided on the air inlet. The present invention can meet the heat dissipation requirements of electronic cabinets and electronic shelters with large air volume demands.

Description

Technical Field

[0001] The present invention relates to the field of evaporation devices of air conditioning systems, and particularly to a dual-air duct evaporation regulation device. Background Art

[0002] In recent years, with the rapid development of electronic cabinets and electronic shelters, the integration degree and heat flux density of their electronic devices have been continuously climbing, which has promoted the air volume and air pressure of the air conditioners supporting them to be higher and higher, so as to provide enough cooling air flow to blow through the heating area, enhance heat dissipation, and thus ensure the continuous and reliable operation of electronic equipment. The biggest features of such air conditioners are: large air volume, small temperature difference, and controllable temperature and humidity.

[0003] For example, for a 25 kW ordinary air conditioner, the indoor side circulating air volume is designed to be 4000 m3 / h, and the average wind speed through the evaporator front face is 2.5 m / s, then an area of 0.444 m2 is required, and the cross-sectional size is taken as 888 mm×500 mm. When a large-air-volume air conditioner is adopted, such as when the circulating air volume is designed to be 8000 m3 / h, the average wind speed under the same cross-section will increase by 2.0 times to reach 5.0 m / s. Due to the increase in the average wind speed on the front face, for a finned-tube evaporator, the local wind speed through the narrowest cross-section will also increase in proportion. When the local wind speed at the narrowest cross-section increases from 4.0 m / s to 7.0 - 8.0 m / s, the condensed water generated on the fins no longer flows to the water tank by gravity, but is blown out by the wind, affecting the load insulation safety. Therefore, the common method in the industry is to increase the evaporation temperature of the evaporator, so that the surface temperature of the evaporator fins is higher than the dew point temperature of the air, so as not to generate the condensed water phenomenon, which has a good effect on a relatively stable system. At the same time, due to the increase in the evaporation temperature, the refrigeration capacity of the compressor is also increased, enabling the product to operate energy-efficiently. However, when the electronic equipment is in an environment with high humidity and needs to be frequently turned on and off, such large-air-volume air conditioners are difficult to be competent because there is no more feasible dehumidification method.

[0004] Currently, the main solutions are as follows: ① adding a set of dehumidifying air conditioner or rotary dehumidification device to work synchronously with the large-air-volume air conditioner; ② adding a dehumidification sub-system on the basis of the large-air-volume air conditioner to establish a dual evaporation temperature; ③ diverting air through a wind valve to let part of the air flow through the evaporator to achieve dehumidification. For solutions ① and ②, it usually causes the equipment structure to be complex and the volume to be large, which is unacceptable for small spaces; for solution ③, it is difficult to accurately control the method of both cooling and dehumidifying.

[0005] Based on the rapid development of the deep dehumidification technology under small air volume and the sensible heat refrigeration technology under large air volume, how to give full play to the advantages of both and achieve dehumidification under large air volume through the dual-channel evaporation regulation technology is worthy of research. Summary of the Invention

[0006] The object of the present invention is to solve the problems existing in the prior art, and to provide a dual-channel evaporation regulation technology to effectively control temperature and humidity under a large air volume.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A dual-duct evaporation regulation device, characterized in that: it includes a main duct and an auxiliary duct, the main duct and the auxiliary duct are separated by a partition, and it also includes an evaporator device. The evaporator device is divided into two sections, one section is the main evaporator and the other section is the auxiliary evaporator. The evaporator device is installed through the partition between the main and auxiliary ducts. The main evaporator in the evaporator device is located in the main duct, and the auxiliary evaporator in the evaporator device is located in the auxiliary duct. An air inlet penetrating the partition is provided on the partition on the windward side of the evaporator device, and an air outlet penetrating the partition is provided on the partition on the leeward side of the evaporator device. The main and auxiliary ducts are communicated by the air inlet and outlet respectively, and a damper regulator for adjusting the opening degree of the air inlet is installed at the air inlet.

[0009] The described dual-duct evaporation regulation device is characterized in that: a fan is arranged on one side of the evaporator device in the main duct.

[0010] The described dual-duct evaporation regulation device is characterized in that: the damper regulator includes a damper plate whose area can completely cover the air inlet, and one side of the damper plate is rotatably connected to the side wall of the air inlet.

[0011] The described dual-duct evaporation regulation device is characterized in that: the opening direction of the damper plate is opposite to the air inlet direction in the main duct.

[0012] The described dual-duct evaporation regulation device is characterized in that: an electric heating unit is installed near the air outlet in the auxiliary duct.

[0013] The described dual-duct evaporation regulation device is characterized in that: the interior of the auxiliary duct is designed to be streamlined.

[0014] The beneficial effects of the present invention:

[0015] 1. The present invention utilizes the gravity flow water characteristic on the surface of the evaporator fins to divide the evaporator into an upper and a lower layer of the main evaporator and the auxiliary evaporator with different temperatures, and realizes the functions of temperature regulation and humidity regulation respectively.

[0016] 2. The present invention makes use of the ingenious layout of the main and auxiliary ducts up and down to realize the distribution of large and small air volumes.

[0017] 3. The structure of the present invention is compact, the auxiliary duct fan is omitted, and the space design is reasonable.

[0018] 4. The present invention is easy to implement and has a low cost. Brief Description of the Drawings

[0019] Figure 1 It is a structural diagram of the present invention. Detailed Embodiment

[0020] The present invention will be further described below in conjunction with the drawings and embodiments.

[0021] As Figure 1 shown, the figure shows the air flow direction and the refrigerant flow direction provided externally. A dual-channel evaporation regulation technology of the present invention includes an evaporator device 1, a main air duct 2, an auxiliary air duct 4, a damper regulator 3, a heating unit 5, and a fan 6. A shroud is covered on the outer side wall of the lower part of the main air duct 2, and the space formed by the shroud and the lower side wall of the main air duct 2 constitutes the auxiliary air duct 4, and the lower side wall of the main air duct 2 serves as a partition for separating the main air duct 2 and the auxiliary air duct 4.

[0022] The evaporator device 1 is a combination formed by an upper part and a lower part. The upper part of the evaporator device 1 is the main evaporator 1.1, which is mainly used for cooling the air temperature to control the dry bulb temperature. The lower part of the evaporator device 1 is the auxiliary evaporator 1.2, which is mainly used for condensing the air moisture to control the wet bulb temperature. The windward sides of the main evaporator 1.1 and the auxiliary evaporator 1.2 are both located on the same side of the evaporator device 1 (the right side in the figure), and the leeward sides of the main evaporator 1.1 and the auxiliary evaporator 1.2 are both located on the other same side of the evaporator device 1 (the left side in the figure).

[0023] An installation hole is provided on the lower side wall of the main air duct 2 between the main air duct 2 and the auxiliary air duct 4. The evaporator device 1 is installed through the installation hole. The main evaporator 1.1 of the evaporator device 1 is located in the main air duct, and the auxiliary evaporator 1.2 is located in the auxiliary air duct.

[0024] A through hole is provided on the lower side wall of the main air duct 2 in the leeward side direction of the evaporator device 1 as an air outlet, and a through hole is provided on the lower side wall of the main air duct 2 in the windward side direction of the evaporator device 1 as an air inlet. The main air duct 2 and the auxiliary air duct 4 are respectively communicated by the air inlet and the air outlet.

[0025] Among them, at least a damper regulator 3 is installed at the air inlet. The damper regulator 3 is used to adjust the opening degree of the air inlet. The damper regulator 3 is a wind door plate. One side of the wind door plate is rotatably connected to the side wall of the air inlet, and the area of the wind door plate can completely cover the air inlet. Of course, a damper regulator can also be installed at the air outlet in the present invention.

[0026] A drain hole is provided below the auxiliary air duct 4, which is mainly used for discharging the condensed water generated by the auxiliary evaporator 1.2 from the drain hole; when the condensed water generated by the main evaporator 1.1 under special circumstances can directly drip onto the auxiliary evaporator 1.2 and then be discharged through the drain hole. The auxiliary evaporator 1.2 is designed with a small volume and a small air volume. For example, the corresponding heat exchange area is 10% - 40% of that of the main evaporator, so that the fin surface temperature is lower than the air dew point temperature.

[0027] The fan 6 is located on one side of the evaporator device 1 in the main air duct 2, forming a large air volume cooling requirement for the load and the main evaporator 1.1. The small air volume required for the auxiliary air duct 4 is achieved by adjusting the angle θ of the damper regulator 3. Usually, the air volume of the auxiliary air duct 4 is only 10% - 20% of the air volume of the main air duct 2.

[0028] The direction in which the damper regulator 3 rotates and opens from the air inlet should be opposite to the wind direction in the main air duct 2. The damper regulator 3 uses an automatic damper for automatic control, but it does not exclude using a fixed damper through experiments.

[0029] In the present invention, a heating unit 5 is installed near the air outlet in the auxiliary air duct 4. The heating unit 5 can be a local heat pipe from the high-pressure side of the compressor, or an electric heater, etc., which is used to increase the temperature of the air after flowing through the auxiliary evaporator for refrigeration and dehumidification.

[0030] In the present invention, the auxiliary air duct 4 can be designed into a streamlined structure according to the characteristics of the airflow field to reduce resistance.

[0031] The present invention is further elaborated as follows:

[0032] In the background technology, the indoor side circulation air volume of a 25kW large air volume air conditioner is designed to be 8000 m3 / h, a 300Pa static pressure fan is selected, and the power consumption is 2200W; the designed condensation temperature is 50°C, the condensation air volume is 10000 m3 / h, and the power consumption of the condensation fan is 1760W.

[0033] According to the conventional scheme, assuming the evaporation temperature is 7°C and the condensation temperature is 50°C, the selected compressor refrigerating capacity is 28000 W, COP is 3.5, and the compressor power consumption is 8000W; then the total power consumption of the equipment is 11960 W.

[0034] According to the scheme of the present invention, for the main evaporator system: assuming the evaporation temperature is 12°C and the condensation temperature is 50°C, the selected compressor refrigerating capacity is 25200 W, COP is 4.2, and the compressor power consumption is 6000 W; for the auxiliary evaporator system: according to the evaporation temperature of 0°C and the condensation temperature of 50°C, the selected compressor refrigerating capacity is 2800 W, COP is 2.3, and the compressor power consumption is 1217W; then the total power consumption of the equipment is 11177 W, saving 783W relatively, that is, 6.5%.

[0035] After starting to work using the present invention, the fan 6 is always in the working state to ensure a stable large air volume to meet the wind speed required by the load. At the same time, according to the temperature and humidity requirements, it enters the following 3 state modes or switches respectively:

[0036] 1) When cooling is achieved but dehumidification is not required, the main evaporator of the device is turned on, and the large-volume air directly passes through the main evaporator for cooling and is sent to the load to achieve sensible heat cooling.

[0037] 2) When both cooling and dehumidification requirements are met, the main evaporator, auxiliary evaporator and air damper regulator of the device are turned on. The main evaporator mainly cools the sensible heat part of the air, and the auxiliary evaporator mainly cools the latent heat part of the air and condenses out water.

[0038] 3) When cooling is not required and only dehumidification is needed, the auxiliary evaporator, air damper regulator and heating unit of the device are turned on. The auxiliary evaporator mainly cools the latent heat part of the air and condenses out water, and the heating unit reheats the air after cooling and dehumidification to keep the outlet air temperature in line with the air supply requirements. In this mode, the air conditioner is more energy-efficient.

[0039] What needs to be supplemented for the present invention is that: in addition to the refrigerant from the external compression refrigeration cycle, the cooling medium in the main evaporator 1.1 and the auxiliary evaporator 1.2 does not rule out the selection of two different temperature heat transfer fluids.

[0040] The embodiments described in the present invention are only descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design idea of the present invention, various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. A dual-air duct evaporation regulation device, characterized in that: It includes a main air duct and an auxiliary air duct. The main air duct and the auxiliary air duct are separated by a partition. It also includes an evaporator device which is divided into two sections, one of which is the main evaporator and the other is the auxiliary evaporator. The evaporator device is installed through the partition between the main and auxiliary air ducts. The main evaporator in the evaporator device is located in the main air duct, and the auxiliary evaporator in the evaporator device is located in the auxiliary air duct. An air inlet penetrating the partition is provided on the partition on the windward side of the evaporator device, and an air outlet penetrating the partition is provided on the partition on the leeward side of the evaporator device. The main and auxiliary air ducts are communicated by the air inlet and the air outlet respectively, and a damper regulator for adjusting the opening degree of the air inlet is installed at the air inlet; A blower is arranged on one side of the evaporator device in the main air duct; The damper regulator includes a wind door plate whose area can completely cover the air inlet, and one side of the wind door plate is rotatably connected to the side wall of the air inlet; The opening direction of the wind door plate is opposite to the incoming air direction in the main air duct; A heating unit is installed near the air outlet in the auxiliary air duct; When only dehumidification is required without cooling, the equipment turns on the auxiliary evaporator, the damper regulator and the heating unit. The auxiliary evaporator mainly cools the latent heat part in the air and condenses out water, and the heating unit reheats the air after cooling and dehumidification to keep the outlet air temperature meeting the air supply requirements; The interior of the auxiliary air duct is designed to be streamlined.

Images