A dehumidifying air conditioning unit suitable for the transformation of chilled water air conditioning system

Abstract

The utility model discloses a dehumidifying air-conditioning unit suitable for the transformation of a chilled water air-conditioning system, comprising a compressor, a water-cooled condenser, a filter and an evaporator which are arranged in sequence, and also comprises: an air-cooled condenser which is connected in parallel with the water-cooled condenser, the air-cooled condenser being located between the exhaust port of the compressor and the liquid return port of the evaporator; a liquid supply branch which is connected to the water-cooled condenser, a variable frequency cooling water pump being provided at the water inlet of the water-cooled condenser on the liquid supply branch, and a front surface cooler being further provided on the liquid supply branch; a first solenoid valve being provided on the branch where the air-cooled condenser is located, the first solenoid valve being located between the compressor and the air-cooled condenser; a second solenoid valve being provided on the branch where the water-cooled condenser is located, the second solenoid valve being located between the compressor and the water-cooled condenser; the air-cooled condenser being arranged downstream of the evaporator; the first solenoid valve and the second solenoid valve are not closed at the same time, the air humidity of the air-conditioning unit of the utility model is lower, and the heat recovery temperature is adjustable.

Description

Technical Field

[0001] The utility model belongs to the technical field of refrigeration systems, and in particular relates to a dehumidification air conditioning unit suitable for the transformation of a chilled water air conditioning system. Background Art

[0002] A cool warehouse is a special warehouse mainly used to store items that need to be kept at a constant low temperature, such as medicines, food, etc. Compared with general warehouses, cool warehouses have higher standards and requirements in design and operation.

[0003] Cool warehouses are usually equipped with air handling devices such as central chilled water air conditioning systems to control the temperature to ensure the quality and safety of stored items. However, since the chilled water temperature of the chilled water air conditioning terminal used in general cool warehouses is usually 7℃ / 12℃, the wind dew point temperature is relatively high. For cool warehouses with a temperature requirement below 20℃, it is difficult to ensure that the relative humidity is below 75%. Especially during the transition period of seasons such as the return of the south wind and the plum rain days, the humidity often exceeds the standard. If dehumidification is not carried out in time, the stored items will become damp and moldy.

[0004] To solve this problem, the existing practice is usually to use electric heating or industrial dehumidifiers in cool storage areas where the humidity exceeds the standard. This will bring a greater heat load to the storage and increase energy consumption. If the original chilled water is used for dehumidification, it is necessary to add air-conditioning terminals. This treatment method will change the water flow pipes and pipe network resistance of the original chilled water main pipeline, making the transformation difficult, long, and costly. Utility Model Content

[0005] The utility model aims to provide a dehumidification air conditioning unit suitable for the transformation of a chilled water air conditioning system, so as to solve at least one of the above-mentioned technical problems.

[0006] In order to achieve the above utility model purpose, the technical solution adopted by the utility model is as follows:

[0007] A dehumidifying air conditioning unit suitable for the transformation of a chilled water air conditioning system, comprising a compressor, a water-cooled condenser, a filter and an evaporator arranged in sequence, and also comprising:

[0008] An air-cooled condenser, the air-cooled condenser being connected in parallel with the water-cooled condenser, and the air-cooled condenser being located between the exhaust port of the compressor and the liquid return port of the evaporator;

[0009] A liquid supply branch, the liquid supply branch is connected to the water-cooled condenser, and a variable frequency cooling water pump is provided at the water inlet of the water-cooled condenser on the liquid supply branch;

[0010] A first solenoid valve is provided on the branch where the air-cooled condenser is located, and the first solenoid valve is located between the compressor and the air-cooled condenser;

[0011] A second solenoid valve is provided on the branch where the water-cooled condenser is located, and the second solenoid valve is located between the compressor and the water-cooled condenser;

[0012] The air-cooled condenser is arranged downstream of the evaporator;

[0013] The first solenoid valve and the second solenoid valve are not closed at the same time.

[0014] By such arrangement, under the premise that the first solenoid valve and the second solenoid valve are not closed at the same time, the first solenoid valve and the second solenoid valve have three different combination switch states, that is, there are three heat recovery gears: when the first solenoid valve is closed and the second solenoid valve is opened, the air-cooled condenser does not work, the water-cooled condenser works, and no condensation heat recovery is performed; when the first solenoid valve and the second solenoid valve are both opened, the air-cooled condenser and the water-cooled condenser both work, and the refrigerant discharged from the compressor exhaust port is diverted into the air-cooled condenser and the water-cooled condenser, and about 50% of the condensation heat can be recovered ... When the first solenoid valve is opened and the second solenoid valve is closed, the air-cooled condenser works and the water-cooled condenser does not work, and all condensation heat is recovered. It can be seen that when the air-cooled condenser works, the low-temperature air outlet of the evaporator blows toward the air-cooled condenser, exchanges heat with the high-temperature gaseous refrigerant in the air-cooled condenser, and the air outlet temperature rises. Compared with the traditional air-conditioning unit, it is equivalent to increasing the temperature under the condition of unchanged humidity. In other words, when the air outlet temperature of the air-conditioning unit of the present invention is the same as the air outlet temperature of the traditional air-conditioning unit, the air outlet humidity of the air-conditioning unit of the present invention is lower, and the heat recovery gear is adjustable.

[0015] Preferably, it further comprises a liquid storage tank, one end of which is connected to the liquid return port of the evaporator, and the other end of which is connected to the liquid outlet of the air-cooled condenser and / or the water-cooled condenser.

[0016] Preferably, it further comprises a gas-liquid separator, wherein the gas-liquid separator is located between the liquid outlet of the evaporator and the air return port of the compressor.

[0017] Preferably, an expansion valve is further included, and the expansion valve is located between the liquid outlet of the liquid storage tank and the liquid return port of the evaporator.

[0018] Preferably, a first one-way valve is provided on the branch where the air-cooled condenser is located, and the first one-way valve is used to allow the refrigerant to flow from the air-cooled condenser to the evaporator in one direction;

[0019] A second one-way valve is provided on the branch line where the water-cooled condenser is located, and the second one-way valve is used to allow the refrigerant to flow from the water-cooled condenser to the evaporator in one direction.

[0020] Preferably, a front surface cooler is further provided on the liquid supply branch, and the front surface cooler is arranged upstream of the evaporator.

[0021] Preferably, it also includes a fan, which is arranged downstream of the air-cooled condenser.

[0022] Beneficial effects:

[0023] The utility model provides a dehumidifying air-conditioning unit suitable for the transformation of a chilled water air-conditioning system, comprising a compressor, a water-cooled condenser, a filter and an evaporator which are arranged in sequence, and also comprising an air-cooled condenser and a liquid supply branch, the air-cooled condenser and the water-cooled condenser are connected in parallel, the air-cooled condenser is located between the exhaust port of the compressor and the liquid return port of the evaporator; the liquid supply branch is connected to the water-cooled condenser, and a variable frequency cooling water pump is provided at the water inlet of the water-cooled condenser on the liquid supply branch; a first solenoid valve is provided on the branch where the air-cooled condenser is located, and the first solenoid valve is located between the compressor and the air-cooled condenser; a second solenoid valve is provided on the branch where the water-cooled condenser is located, and the second solenoid valve is located between the compressor and the water-cooled condenser; the air-cooled condenser is arranged downstream of the evaporator; the first solenoid valve and the second solenoid valve are not closed at the same time; in this way, under the premise that the first solenoid valve and the second solenoid valve are not closed at the same time, the first solenoid valve and the second solenoid valve have three different combined switch states, that is, there are three heat recovery gears: When the first solenoid valve is closed and the second solenoid valve is opened, the air-cooled condenser does not work, the water-cooled condenser works, and no condensation heat recovery is performed; when the first solenoid valve and the second solenoid valve are both opened, the air-cooled condenser and the water-cooled condenser both work, and the refrigerant discharged from the compressor exhaust port is diverted into the air-cooled condenser and the water-cooled condenser, which can recover about 50% of the condensation heat; when the first solenoid valve is opened and the second solenoid valve is closed, the air-cooled condenser works, the water-cooled condenser does not work, and all the condensation heat is recovered; in summary, when the air-cooled condenser is working, the low-temperature air outlet of the evaporator blows toward the air-cooled condenser, exchanges heat with the high-temperature gaseous refrigerant in the air-cooled condenser, and the air outlet temperature rises. Compared with the traditional air-conditioning unit, it is equivalent to a temperature increase 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 the air outlet temperature of the traditional air-conditioning unit, the air outlet humidity of the air-conditioning unit of the utility model is lower, and the heat recovery temperature is adjustable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of an air conditioning unit according to Embodiment 1 of the present utility model;

[0025] Figure 2 This is a schematic diagram of the structure of an air conditioning unit according to Embodiment 2 of the present utility model;

[0026] Figure 3 This is a schematic diagram of an air conditioning unit according to this embodiment with a cool storage unit added;

[0027] Figure 4 A schematic diagram of adding cool storage units to multiple air conditioning units of this embodiment.

[0028] Reference numerals

[0029] 1- compressor; 2- first solenoid valve; 3- second solenoid valve; 4- air-cooled condenser; 5- water-cooled condenser; 6- variable frequency cooling water pump; 7- first one-way valve; 8- second one-way valve; 9- gas-liquid separator; 10- evaporator; 11- liquid storage tank; 12- expansion valve; 13- front surface cooler; 14- fan. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0031] The technical solution of the utility model is described in detail below with specific embodiments.

[0032] Example 1

[0033] See also Figure 1 The embodiment of the utility model discloses a dehumidifying air-conditioning unit suitable for the transformation of a chilled water air-conditioning system, comprising a compressor 1, a water-cooled condenser 5, a filter and an evaporator 10 which are arranged in sequence, and also comprising an air-cooled condenser 4, which is connected in parallel with the water-cooled condenser 5 and is located between the exhaust port of the compressor 1 and the liquid return port of the evaporator 10; the water-cooled condenser 5 is externally connected to a liquid supply branch, and a variable frequency cooling water pump 6 is provided at the water inlet of the water-cooled condenser 5 on the liquid supply branch; a first solenoid valve 2 is provided on the branch where the air-cooled condenser 4 is located, and the first solenoid valve 2 is located between the compressor 1 and the air-cooled condenser 4; a second solenoid valve 3 is provided on the branch where the water-cooled condenser 5 is located, and the second solenoid valve 3 is located between the compressor 1 and the water-cooled condenser 5; the air-cooled condenser 4 is arranged downstream of the evaporator 10; the first solenoid valve 2 and the second solenoid valve 3 are not closed at the same time.

[0034] Furthermore, a first one-way valve 7 is provided on the branch where the air-cooled condenser 4 is located, and the first one-way valve 7 is used to allow the refrigerant to flow from the air-cooled condenser 4 to the evaporator 10 in one direction; a second one-way valve 8 is provided on the branch where the water-cooled condenser 5 is located, and the second one-way valve 8 is used to allow the refrigerant to flow from the water-cooled condenser 5 to the evaporator 10 in one direction.

[0035] Specifically, the air conditioning unit of this embodiment further includes a liquid storage tank 11, one end of the liquid storage tank 11 is connected to the liquid return port of the evaporator 10, and the other end is connected to the liquid outlet of the air-cooled condenser 4 and / or the water-cooled condenser 5. The liquid storage tank 11 can effectively adjust the refrigerant quality inside the condenser under different heat recovery conditions in the unit; and further includes an expansion valve 12, which is located between the liquid outlet of the liquid storage tank 11 and the liquid return port of the evaporator 10. The expansion valve 12 adjusts the refrigerant in the air-cooled condenser 4 and / or the water-cooled condenser 5 according to the outlet pressure of the evaporator 10. Refrigerant flow rate; the air-conditioning unit of this embodiment also includes a gas-liquid separator 9, which is located between the liquid outlet of the evaporator 10 and the return air port of the compressor 1. The gas-liquid separator 9 can protect the compressor 1 when the refrigerant liquid returns. Specifically, the protection is achieved by separating and preserving the refrigerant liquid in the return air pipe. The gas-liquid separator 9 provides additional internal volume on the low-pressure side of the air-conditioning unit, which can temporarily store excess refrigerant liquid and also prevents excess refrigerant from flowing into the crankcase of the compressor 1 to cause oil dilution.

[0036] Preferably, the air conditioning unit of this embodiment further includes a fan 14, which is arranged downstream of the air-cooled condenser 4 to provide the air circulation volume required for heat exchange.

[0037] Furthermore, point A of the liquid supply branch is the water inlet, and point B is the water outlet. The variable frequency cooling water pump 6 can be controlled by variable frequency to extract an appropriate amount of water to ensure that the water-cooled condenser 5 has a suitable condensing temperature (condensing pressure). For example, when the state of the air-conditioning unit changes from the first solenoid valve 2 being closed and the second solenoid valve 3 being opened to the first solenoid valve 2 and the second solenoid valve 3 being opened, the condensing pressure of the water-cooled condenser 5 will suddenly drop. At this time, the variable frequency cooling water pump 6 will automatically reduce the frequency of operation and reduce the water inlet flow rate at the water inlet to maintain the condensing temperature of the refrigerant unchanged, thereby ensuring that the air-cooled condenser 4 has sufficient heat exchange temperature difference to achieve the effect of condensation heat recovery.

[0038] Specifically, the air is first cooled and dehumidified by the evaporator 10, and then is heated by the air-cooled condenser 4 to reduce the relative humidity of the outlet air. Under the premise that the first solenoid valve 2 and the second solenoid valve 3 are not closed at the same time, the first solenoid valve 2 and the second solenoid valve 3 have three different combined switch states, that is, there are three heat recovery gears: when the first solenoid valve 2 is closed and the second solenoid valve 3 is opened, the air-cooled condenser 4 does not work, the water-cooled condenser 5 works, and no condensation heat recovery is performed; when the first solenoid valve 2 and the second solenoid valve 3 are both opened, the air-cooled condenser 4 and the water-cooled condenser 5 both work, and the refrigerant discharged from the exhaust port of the compressor 1 is diverted into the air-cooled condenser 4 and the water-cooled condenser 5. 5, can recover about 50% of the condensation heat; when the first solenoid valve 2 is opened and the second solenoid valve 3 is closed, the air-cooled condenser 4 works and the water-cooled condenser 5 does not work, and all the condensation heat is recovered. It can be seen that when the air-cooled condenser 4 works, the low-temperature air outlet of the evaporator 10 blows to the air-cooled condenser 4, and exchanges heat with the high-temperature gaseous refrigerant in the air-cooled condenser 4, and the air outlet temperature increases. Compared with the traditional air-conditioning unit, it is equivalent to increasing the temperature under the condition of unchanged humidity; in other words, when the air outlet temperature of the air-conditioning unit of the utility model is the same as the air outlet temperature of the traditional air-conditioning unit, the air outlet humidity of the air-conditioning unit of the utility model is lower, and the heat recovery gear is adjustable.

[0039] Example 2

[0040] This embodiment is improved on the basis of embodiment 1, and the repeated parts will not be described in detail. Figure 2 The liquid supply branch of the air-conditioning unit of this embodiment is also provided with a front surface cooler 13, which is arranged upstream of the evaporator 10. The water at the water inlet at A is pumped in by the variable frequency cooling water pump 6, first enters the front surface cooler 13, then flows into the water-cooled condenser 5, and finally flows out from the water outlet at B. The air is first cooled by the front surface cooler 13, then cooled and dehumidified by the evaporator 10, and then heated by the air-cooled condenser 4. Compared with the embodiment 1, the air-conditioning unit of this embodiment has a better effect of reducing the relative humidity of the outlet air.

[0041] Combining Example 1 and Example 2, it can be seen that the air conditioning unit provided by the utility model can effectively reduce the relative humidity of the air outlet. Figure 3As shown, C and D are the main water supply pipe and the main return pipe of the chilled water, respectively. When any one of the air-conditioning units of Example 1 and Example 2 is added to the existing cool storage ventilation system, there is no need to change the original chilled water main pipes at C and D. It is only necessary to add the air-conditioning unit of the utility model at an appropriate position (for example, at E). According to the characteristics of the cool storage, humidity usually exceeds the standard during the seasonal transition period. At this time, the entire ventilation system is actually in a partial load operation period. Therefore, the total cooling capacity is sufficient and there is no need to change the original cold source system. If the cooling capacity is indeed insufficient, it is only necessary to increase the cooling capacity of the cold source. Compared with changing the water flow pipe and pipe network resistance of the chilled water main pipe, the renovation project of increasing the cooling capacity of the cold source is very easy.

[0042] If the dehumidification effect of adding a set of air conditioning units of the utility model is not enough, more units can be added, such as Figure 4 As shown, a group of air conditioning units are added at F and G respectively, and the specific process is not further described.

[0043] In summary, the utility model provides a dehumidifying air-conditioning unit suitable for the transformation of a chilled water air-conditioning system, comprising a compressor 1, a water-cooled condenser 5, a filter and an evaporator 10 arranged in sequence, and also comprising an air-cooled condenser 4 and a liquid supply branch, the air-cooled condenser 4 is connected in parallel with the water-cooled condenser 5, and the air-cooled condenser 4 is located between the exhaust port of the compressor 1 and the liquid return port of the evaporator 10; the liquid supply branch is connected to the water-cooled condenser 5, and a variable frequency cooling water pump 6 is provided at the water inlet of the water-cooled condenser 5 on the liquid supply branch; a first solenoid valve 2 is provided on the branch where the air-cooled condenser 4 is located, and the first solenoid valve 2 is located between the compressor 1 and the air-cooled condenser 4; a second solenoid valve 3 is provided on the branch where the water-cooled condenser 5 is located, and the second solenoid valve 3 is located between the compressor 1 and the water-cooled condenser 5; the air-cooled condenser 4 is arranged downstream of the evaporator 10; the first solenoid valve 2 and the second solenoid valve 3 are not closed at the same time; in this way, under the premise that the first solenoid valve 2 and the second solenoid valve 3 are not closed at the same time, the first solenoid valve 2 and the second solenoid valve 3 have three different combination switch states, namely There are three heat recovery gears: when the first solenoid valve 2 is closed and the second solenoid valve 3 is opened, the air-cooled condenser 4 does not work, the water-cooled condenser 5 works, and no condensation heat recovery is performed; when the first solenoid valve 2 and the second solenoid valve 3 are both opened, the air-cooled condenser 4 and the water-cooled condenser 5 both work, and the refrigerant discharged from the exhaust port of the compressor 1 is divided into the air-cooled condenser 4 and the water-cooled condenser 5, which can recover about 50% of the condensation heat; when the first solenoid valve 2 is opened and the second solenoid valve 3 is closed, the air-cooled condenser 4 works, and the water-cooled condenser 5 works. The cold condenser 5 is not working, and all the condensation heat is recovered; in summary, when the air-cooled condenser 4 is working, the low-temperature air outlet of the evaporator 10 is blown toward the air-cooled condenser 4, and heat is exchanged with the high-temperature gaseous refrigerant in the air-cooled condenser 4, and the air outlet temperature increases. Compared with the traditional air-conditioning unit, it is equivalent to a temperature increase 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 the air outlet temperature of the traditional air-conditioning unit, the air outlet humidity of the air-conditioning unit of the utility model is lower, and the heat recovery temperature is adjustable.

[0044] The above is a detailed description of an embodiment of a dehumidification air conditioning unit suitable for the transformation of a chilled water air conditioning system provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A dehumidifying air conditioning unit suitable for the transformation of a chilled water air conditioning system, comprising a compressor (1), a water-cooled condenser (5), a filter and an evaporator (10) arranged in sequence, characterized in that: Also includes: An air-cooled condenser (4), the air-cooled condenser (4) being connected in parallel with the water-cooled condenser (5), the air-cooled condenser (4) being located between the exhaust port of the compressor (1) and the liquid return port of the evaporator (10); A liquid supply branch, the liquid supply branch being connected to the water-cooled condenser (5), a variable frequency cooling water pump (6) being provided on the liquid supply branch at the water inlet of the water-cooled condenser (5), and a front surface cooler (13) being provided on the liquid supply branch, wherein the front surface cooler (13) is provided upstream of the evaporator (10); A first solenoid valve (2) is provided on the branch where the air-cooled condenser (4) is located, and the first solenoid valve (2) is located between the compressor (1) and the air-cooled condenser (4); A second solenoid valve (3) is provided on the branch where the water-cooled condenser (5) is located, and the second solenoid valve (3) is located between the compressor (1) and the water-cooled condenser (5); The air-cooled condenser (4) is arranged downstream of the evaporator (10); The first solenoid valve (2) and the second solenoid valve (3) are not closed at the same time.

2. A dehumidification air conditioning unit suitable for the transformation of a chilled water air conditioning system according to claim 1, characterized in that: It also comprises a liquid storage tank (11), one end of which is connected to the liquid return port of the evaporator (10), and the other end of which is connected to the liquid outlet of the air-cooled condenser (4) and / or the water-cooled condenser (5).

3. A dehumidification air conditioning unit suitable for reconstruction of a chilled water air conditioning system according to claim 1, characterized in that: It also includes a gas-liquid separator (9), which is located between the liquid outlet of the evaporator (10) and the gas return port of the compressor (1).

4. A dehumidification air conditioning unit suitable for reconstruction of a chilled water air conditioning system according to claim 2, characterized in that: It also includes an expansion valve (12), wherein the expansion valve (12) is located between the liquid outlet of the liquid storage tank (11) and the liquid return port of the evaporator (10).

5. A dehumidification air conditioning unit suitable for reconstruction of a chilled water air conditioning system according to claim 1, characterized in that: A first one-way valve (7) is provided on the branch line where the air-cooled condenser (4) is located, and the first one-way valve (7) is used to allow the refrigerant to flow from the air-cooled condenser (4) to the evaporator (10) in one direction; A second one-way valve (8) is provided on the branch line where the water-cooled condenser (5) is located. The second one-way valve (8) is used to allow the refrigerant to flow from the water-cooled condenser (5) to the evaporator (10) in one direction.

6. A dehumidification air conditioning unit suitable for reconstruction of a chilled water air conditioning system according to claim 1, characterized in that: It also includes a fan (14), which is arranged downstream of the air-cooled condenser (4).

Images