Dehumidification air conditioning unit for shady and cool storage

Abstract

The utility model discloses a shady and cool warehouse dehumidification air conditioning unit which comprises a compressor, a water cooling condenser, a filter and an evaporator which are arranged in sequence, the shady and cool warehouse dehumidification air conditioning unit further comprises a subcooler and an expansion valve, the subcooler is located between a liquid outlet of the filter and a liquid return opening of the evaporator, and refrigerant liquid in the water cooling condenser flows into the subcooler through the filter; the expansion valve is located between the subcooler and the evaporator and adjusts the refrigerant liquid flow according to the outlet pressure of the evaporator. According to the arrangement, low-temperature outlet air of the evaporator directly blows the subcooler to cool refrigerant liquid in the subcooler, so that the enthalpy value of the expansion valve before throttling is reduced, the heat exchange amount of the evaporator is increased, the temperature of the outlet air is increased while the temperature of the refrigerant liquid in the subcooler is reduced, and the heat exchange efficiency of the evaporator is improved. Compared with a traditional air conditioning unit, the air conditioning unit has the advantages that the temperature is increased under the condition that the humidity is not changed, that is, when the air outlet temperature of the air conditioning unit is the same as the air outlet temperature of the traditional air conditioning unit, the air outlet humidity of the air conditioning unit is lower.

Description

Technical Field

[0001] The utility model belongs to the technical field of warehouse air conditioning systems, and particularly relates to a dehumidifying air conditioning unit for a cool storage warehouse. Background Art

[0002] A cool storage warehouse is a special warehouse mainly used for storing items that need to maintain a constant low temperature, such as medicines, foods, etc. Compared with general warehouses, cool storage warehouses have higher standards and requirements in terms of design and operation.

[0003] Cool storage warehouses usually set up central chilled water air conditioning systems or water source heat pumps and other air handling devices to control temperature and humidity to ensure the quality and safety of stored items. General cool storage warehouses need to ensure temperature and humidity throughout the year. In some weather conditions, especially during transitional seasons such as the return of humidity and the plum rain season, there is usually a large moisture load in the warehouse, and the cooling load is relatively small. At this time, if only conventional air conditioning means are used, the temperature in the warehouse usually drops relatively low while dehumidifying. Although the moisture in the air is removed in this way, the relative humidity may not necessarily be low. It may be necessary to adopt a heating and temperature recovery scheme for some air conditioners to solve this problem. Whether it is electric heating temperature recovery or heat pump temperature recovery, it will increase the air conditioning load, and thus increase the operating cost of the warehouse. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an air conditioning unit capable of dehumidifying a cool storage warehouse to solve at least one of the above technical problems.

[0005] To achieve the above utility model purpose, the technical solution adopted by the utility model is as follows:

[0006] A dehumidifying air conditioning unit for a cool storage warehouse includes a compressor, a water-cooled condenser, a filter, and an evaporator arranged in sequence. It is characterized in that it further includes:

[0007] A subcooler, the subcooler is located between the liquid outlet of the filter and the liquid return port of the evaporator, and the refrigerant liquid in the water-cooled condenser flows into the subcooler through the filter;

[0008] An expansion valve, the expansion valve is located between the subcooler and the evaporator, and the expansion valve adjusts the refrigerant liquid flow rate according to the evaporator outlet pressure;

[0009] The subcooler is arranged downstream of the evaporator.

[0010] By setting it like this, the cold air discharged from the evaporator blows directly through the subcooler, cooling the refrigerant liquid in the subcooler, reducing the enthalpy value before the expansion valve throttles, and thus increasing the heat exchange capacity of the evaporator. On the other hand, when the cold air discharged from the evaporator blows directly through the subcooler, heat exchange occurs between the air and the subcooler. While the temperature of the refrigerant liquid in the subcooler decreases, the temperature of the discharged air increases. Compared with traditional air-conditioning units, it is equivalent to an increase in temperature under the condition of constant humidity. In other words, when the discharged air temperature of the air-conditioning unit of the present invention is the same as that of a traditional air-conditioning unit, the humidity of the discharged air of the air-conditioning unit of the present invention is lower. By adjusting the refrigerant flow rate through the subcooler, the heat exchange capacity of the subcooler can be controlled, that is, by adjusting the refrigerant flow rate through the subcooler, the relative humidity of the discharged air and / or the relative humidity of the return air can be controlled.

[0011] Preferably, it further includes a three-way regulating valve, and the three-way regulating valve is provided with three mutually communicating openings, defined as the first opening, the second opening, and the third opening respectively;

[0012] The first opening communicates with the liquid outlet of the filter, the second opening communicates with the liquid inlet of the subcooler, and the third opening communicates with the liquid outlet of the subcooler.

[0013] Preferably, it further includes two electric valves, defined as the first electric valve and the second electric valve respectively;

[0014] The first electric valve and the second electric valve are respectively located in two parallel branches;

[0015] One end of the first electric valve communicates with the liquid outlet of the filter, and the other end communicates with the liquid return port of the evaporator;

[0016] One end of the second electric valve communicates with the liquid outlet of the filter, and the other end communicates with the liquid inlet of the subcooler.

[0017] Preferably, it further includes a fan, and the fan is arranged downstream of the subcooler.

[0018] Preferably, the subcooler is configured as a finned heat exchanger.

[0019] Beneficial effects:

[0020] The utility model provides a dehumidifying air-conditioning unit for a cool storage, which comprises a compressor, a water-cooled condenser, a filter and an evaporator arranged in sequence, and also comprises a subcooler and an expansion valve. The subcooler is located between the liquid outlet of the filter and the liquid return port of the evaporator, and the refrigerant liquid in the water-cooled condenser flows into the subcooler through the filter; the expansion valve is located between the subcooler and the evaporator, and the expansion valve adjusts the refrigerant liquid flow according to the evaporator outlet pressure; the subcooler is arranged downstream of the evaporator. With such an arrangement, the low-temperature air outlet of the evaporator blows directly on the subcooler to cool the refrigerant liquid in the subcooler, so that the enthalpy value before the throttling of the expansion valve is reduced, and further the heat exchange capacity of the evaporator is increased; on the other hand, when the low-temperature air outlet of the evaporator blows directly on the subcooler, heat exchange occurs between the air outlet and the subcooler. While the temperature of the refrigerant liquid in the subcooler decreases, the temperature of the air outlet increases. Compared with the traditional air-conditioning unit, it is equivalent to an increase in temperature under the condition of constant humidity; in other words, when the air outlet temperature of the air-conditioning unit of the utility model is the same as that of the traditional air-conditioning unit, the humidity of the air outlet of the air-conditioning unit of the utility model is lower. At the same time, with a preferred solution, a three-way regulating valve is arranged in front of the subcooler, and the relative humidity of the air outlet can be adjusted by adjusting the refrigerant flow through the subcooler, so as to change the latent heat ratio of the evaporator. When a large amount of dehumidification is required, the latent heat ratio is increased, and when a small amount of dehumidification is required, the latent heat ratio is reduced. It can effectively work according to the load characteristics of the cool storage, without generating redundant sensible cooling capacity or redundant latent heat, and can achieve the maximum energy-saving requirement under the condition of meeting the requirements of the storage temperature and humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the air-conditioning unit according to Embodiment 1 of the utility model;

[0022] Figure 2 is a schematic structural diagram of the air-conditioning unit according to Embodiment 2 of the utility model;

[0023] Figure 3 is a schematic structural diagram of the air-conditioning unit according to Embodiment 3 of the utility model.

[0024] REFERENCE NUMERALS

[0025] 1 - Compressor; 2 - Water-cooled condenser; 3 - Filter; 4 - Expansion valve; 5 - Evaporator; 6 - Fan; 7 - Subcooler; 8 - Three-way regulating valve; 9 - First electric valve; 10 - Second electric valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will describe the specific embodiments of the present invention with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other embodiments can also be obtained.

[0027] The following will introduce the technical solutions of the present invention in detail with specific embodiments.

[0028] Embodiment 1

[0029] As Figure 1 shown, an embodiment of the present invention discloses a dehumidifying air-conditioning unit for a cool storage. The air-conditioning unit includes a compressor 1, a water-cooled condenser 2, a filter 3, and an evaporator 5 arranged in sequence, and also includes a subcooler 7 and an expansion valve 4. The subcooler 7 is located between the liquid outlet of the filter 3 and the liquid return port of the evaporator 5, and the refrigerant liquid in the water-cooled condenser 2 flows into the subcooler 7 through the filter 3; the expansion valve 4 is located between the subcooler 7 and the evaporator 5, and the expansion valve 4 adjusts the refrigerant liquid flow rate according to the outlet pressure of the evaporator 5; the subcooler 7 is arranged downstream of the evaporator 5, and the low-temperature air blown out by the evaporator 5 blows towards the subcooler 7. It also includes a fan 6, and the fan 6 is arranged downstream of the subcooler 7. The low-temperature air passing through the subcooler 7 is then accelerated and dissipated into the cool storage by the fan 6; the return air also passes through the evaporator 5, the subcooler 7, and the fan 6 in sequence and is dissipated into the cool storage.

[0030] When the air-conditioning unit of this embodiment works, the low-temperature air blown out by the evaporator 5 directly blows on the subcooler 7 to cool the refrigerant liquid in the subcooler 7, reducing the enthalpy value before the throttling of the expansion valve 4, and thus increasing the heat exchange capacity of the evaporator 5; on the other hand, when the low-temperature air blown out by the evaporator 5 directly blows on the subcooler 7, heat exchange occurs between the air and the subcooler 7. While the temperature of the refrigerant liquid in the subcooler 7 decreases, the temperature of the air blown out increases. Compared with traditional air-conditioning units, it is equivalent to an increase in temperature under the condition of constant humidity; in other words, when the outlet air temperature of the air-conditioning unit of the present invention is the same as that of the traditional air-conditioning unit, the humidity of the outlet air of the air-conditioning unit of the present invention is lower.

[0031] Preferably, the subcooler 7 in this embodiment is configured as a finned heat exchanger. With this setting, the contact area between the outlet air and the return air of the evaporator 5 and the subcooler 7 can be increased, and the heat exchange efficiency is higher.

[0032] The traditional air conditioner unit was used as a control group for a comparative experiment with the air conditioner unit of this embodiment. The difference lies in whether a subcooler 7 is provided downstream of the evaporator 5. After multiple experiments, according to the calculation of cooling and heating capacity by the enthalpy difference method and taking the average value and rounding it to an integer value, the return air at 19°C and 70% relative humidity passes through the evaporator 5 of the traditional air conditioner unit, the outlet air temperature is 11°C, the relative humidity is 95%, and the dehumidification capacity is 16 kg / h; the return air at 19°C and 70% relative humidity passes through the evaporator 5 and the subcooler 7 of the air conditioner unit of this embodiment, the outlet air temperature is 13°C, the relative humidity is 75%, and the dehumidification capacity is 21 kg / h. That is, the dehumidification capacity of the air conditioner unit of this embodiment increases by 30%, and the outlet air relative humidity drops by more than 20%. The traditional air conditioner unit and the air conditioner unit of this embodiment use the same model of compressor 1. Under the same power consumption, the air conditioner unit of this embodiment is more energy-efficient.

[0033] Embodiment 2

[0034] This embodiment is an improvement based on Embodiment 1, and the repeated parts will not be described additionally. Please refer to Figure 2 , the air conditioner unit of this embodiment further includes a three-way regulating valve 8. The three-way regulating valve 8 is provided with three interconnected openings, which are defined as the first opening, the second opening, and the third opening respectively. The first opening is connected to the liquid outlet of the filter 3, the second opening is connected to the liquid inlet of the subcooler 7, and the third opening is connected to the liquid outlet of the subcooler 7. The first opening is in a normally open state. When the second opening is closed and the third opening is opened, the refrigerant liquid in the water-cooled condenser 2 does not flow into the subcooler 7 and directly passes through the evaporator 5. At this time, the effect of the air conditioner unit of this embodiment is the same as that of the traditional air conditioner unit; when the second opening is opened and the third opening is closed, the refrigerant liquid in the water-cooled condenser 2 flows into the subcooler 7. At this time, the effect of the air conditioner unit of this embodiment is the same as that of the air conditioner unit in Embodiment 1; when the second opening and the third opening are opened simultaneously, the refrigerant liquid can be split. At this time, through the unit controller, according to the set outlet air relative humidity, the split opening of the three-way regulating valve 8 is automatically adjusted. When the outlet air relative humidity is higher than the set value, the opening of the second opening increases and the opening of the third opening decreases, so that the refrigerant flow rate in the subcooler 7 increases, the heat exchange amount of the subcooler 7 is increased, and the outlet air relative humidity is reduced. On the contrary, when the outlet air humidity is lower than the set value, the opening of the second opening decreases and the opening of the third opening increases, so that the refrigerant flow rate in the subcooler 7 decreases, the heat exchange amount of the subcooler 7 is reduced, and the outlet air relative humidity is increased.

[0035] It can be understood that by adjusting the opening ratio of the second opening and the third opening, the refrigerant flow rate passing through the subcooler 7 can be adjusted. By adjusting the refrigerant flow rate passing through the subcooler 7, the heat exchange amount of the subcooler 7 can be controlled. That is, by adjusting the refrigerant flow rate passing through the subcooler 7, the outlet air relative humidity and / or the return air relative humidity can be controlled.

[0036] Compared with the non-adjustable air-conditioning unit in Embodiment 1, the relative humidity of the air outlet of the air-conditioning unit in this embodiment is adjustable, which is adjusted according to the actual needs of the cool storage to prevent excessive dehumidification in the dry season of autumn, resulting in low humidity alarm. It can effectively work according to the load characteristics of the cool storage, without generating redundant sensible cooling capacity or redundant latent heat. Under the condition of meeting the requirements of the storage temperature and humidity, the maximum energy-saving requirement is achieved.

[0037] Embodiment 3

[0038] This embodiment is improved on the basis of Embodiment 1, and the achieved effect is the same as that of Embodiment 2. The repeated parts will not be elaborated additionally. The air-conditioning unit of this embodiment also includes two electric valves, which are defined as the first electric valve 9 and the second electric valve 10 respectively, as specifically shown in Figure 3 As shown, the first electric valve 9 and the second electric valve 10 are respectively located on two parallel branches. One end of the first electric valve 9 is connected to the liquid outlet of the filter 3, and the other end is connected to the liquid inlet of the subcooler 7; one end of the second electric valve 10 is connected to the liquid outlet of the filter 3, and the other end is connected to the liquid inlet of the subcooler 7. The two parallel branches are defined as the first branch and the second branch respectively. The first branch includes the first electric valve 9 and the subcooler 7, and the second branch includes the second electric valve 10. When the first electric valve 9 is closed and the second electric valve 10 is opened, the refrigerant liquid in the water-cooled condenser 2 flows through the filter 3 and the second electric valve 10 into the subcooler 7, and then into the evaporator 5; when the first electric valve 9 is opened and the second electric valve 10 is closed, the effect of the air-conditioning unit in this embodiment is the same as that of the traditional air-conditioning unit at this time; when both the first electric valve 9 and the second electric valve 10 are opened, the refrigerant liquid can be shunted, so that the refrigerant flow rate in the subcooler 7 is less than that in the subcooler 7 when the first electric valve 9 is closed and the second electric valve 10 is opened. The heat exchange time of the subcooler 7 can be controlled by controlling the opening and closing time of the first electric valve 9 and the second electric valve 10, achieving the same effect as the air-conditioning unit in Embodiment 2. The relative humidity of the air outlet is adjustable, which is adjusted according to the actual needs of the cool storage to prevent excessive dehumidification in the dry season of autumn, resulting in low humidity alarm, and can also save the operating electric energy of the entire air-conditioning unit.

[0039] The above has elaborated in detail on the embodiments of a dehumidifying air-conditioning unit for a cool storage provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A cool storage dehumidification air conditioning unit, comprising a compressor (1), a water-cooled condenser (2), a filter (3) and an evaporator (5) arranged in sequence, characterized in that: Also includes: A subcooler (7), the subcooler (7) being located between the liquid outlet of the filter (3) and the liquid return port of the evaporator (5), and the refrigerant liquid in the water-cooled condenser (2) flows into the subcooler (7) through the filter (3); an expansion valve (4), the expansion valve (4) being located between the subcooler (7) and the evaporator (5), the expansion valve (4) adjusting the refrigerant liquid flow rate according to the outlet pressure of the evaporator (5); The subcooler (7) is arranged downstream of the evaporator (5); It also includes two electric valves, which are defined as a first electric valve (9) and a second electric valve (10); The first electric valve (9) and the second electric valve (10) are respectively located in two parallel branches; One end of the first electric valve (9) is connected to the liquid outlet of the filter (3), and the other end is connected to the liquid return port of the evaporator (5); One end of the second electric valve (10) is connected to the liquid outlet of the filter (3), and the other end is connected to the liquid inlet of the supercooler (7); The subcooler (7) is configured as a fin heat exchanger.

2. A cool storage dehumidification air conditioning unit according to claim 1, characterized in that: It also includes a fan (6), which is arranged downstream of the subcooler (7).

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