Heat pump dehumidification system

Abstract

The utility model discloses a heat pump dehumidification system, which relates to the field of dehumidification and comprises an air handling unit, a filter, a heat pump, a fan and a main control unit. The air handling unit comprises a filtering chamber, a cooling chamber and a heat regeneration chamber which are arranged in the airflow flowing direction and communicate with one another. The filter is arranged in the filtering chamber; the heat pump comprises a compressor, a condenser and an evaporator, the compressor is connected with the condenser, an expansion valve is arranged between the condenser and the evaporator, the evaporator is connected with the compressor, the evaporator is arranged in the cooling chamber, and the condenser is arranged in the backheating chamber; and the fan is connected with an outlet of the regenerative chamber. According to the scheme, the heat pump system is adopted for cooling dehumidification and temperature rise backheating, fresh air can be dehumidified to be below the freezing point, it is guaranteed that the moisture content of fresh air flow can reach 3.0 g / kg + / -0.5, heat of the heat pump can be used for heating the fresh air back and forth, heat recovery of the heat pump is achieved, natural gas loss generated when the fresh air flow is heated subsequently is effectively reduced, and energy conservation and environment protection are achieved.

Description

Technical Field

[0001] The utility model relates to the field of dehumidification, in particular to a heat pump dehumidification system. Background Art

[0002] In the prior art, with the improvement of environmental protection standards, water-based paint has gradually been used to replace traditional paint in automobile processing and production. During the flash drying process of water-based paint, the moisture content of the fresh air in the workshop is relatively high, which needs to reach 3g / kg.

[0003] At present, the workshop's fresh air dehumidification mainly uses chilled water dehumidification. The chilled water flowing in at 7°C will be heated to 12°C after heat exchange dehumidification, while the outlet temperature of the fresh air after passing through the cold coil is 14°C and the moisture content is 10g / kg, which obviously cannot meet the 3g / kg moisture content requirement of fresh air for water-based paint flash drying. In addition, before the dehumidified air flows back to the workshop, it needs to be sent to the heating element heating area for heating. It needs to be heated from 14°C to 70°C to meet the process temperature. The outlet temperature of the fresh air refrigeration dehumidification is low, resulting in a large consumption of natural gas when heating the heating element, so it needs to be optimized and improved. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a heat pump dehumidification system.

[0005] The technical solution of the utility model is as follows: A heat pump dehumidification system, characterized in that it includes:

[0006] An air handling unit, the air handling unit comprising a filter chamber, a cooling chamber and a reheat chamber arranged and connected along the air flow direction;

[0007] A filter, wherein the filter is disposed in the filter chamber;

[0008] A heat pump, the heat pump comprising a compressor, a condenser and an evaporator, the compressor being connected to the condenser, the condenser being connected to the evaporator with an expansion valve arranged therebetween, the evaporator being connected to the compressor, the evaporator being arranged in the cooling chamber, and the condenser being arranged in the heat recovery chamber;

[0009] A fan connected to an outlet of the reheat chamber;

[0010] A main control unit, the heat pump and the fan are connected to the main control unit.

[0011] Furthermore, the filter comprises a plate filter and a bag filter, and along the flow direction of the airflow, the plate filter is arranged on the upstream side of the bag filter.

[0012] Furthermore, a water receiving tray is provided at the bottom of the air handling unit.

[0013] Furthermore, the water receiving tray is a heated water receiving tray.

[0014] Furthermore, there are multiple heat pumps, the cooling chamber is divided into multiple cooling zones, evaporators of different heat pumps are arranged in different cooling zones, and the heat recovery chamber is divided into multiple heat recovery zones, condensers of different heat pumps are arranged in different heat recovery zones.

[0015] Furthermore, it also includes a circulating water system, and the air handling unit also includes a circulating water pre-cooling chamber and a circulating water heat recovery chamber, the circulating water pre-cooling chamber is arranged between the filter chamber and the cooling chamber, and the circulating water heat recovery chamber is arranged between the cooling chamber and the heat recovery chamber, the circulating water system includes a circulating water pipe and a circulating pump, the circulating water pipe is provided with the circulating pump, a part of the circulating water pipe is arranged in the circulating water pre-cooling chamber, and a part of the pipe is arranged in the circulating water heat recovery chamber.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0017] This solution mainly uses a heat pump system for cooling and dehumidification and heating and heat recovery. It can not only dehumidify the fresh air to below the freezing point and ensure that the moisture content of the fresh air flow can reach 3.0g / kg±0.5, but also use the heat of the heat pump to heat the fresh air back and forth, realizing heat recovery of the heat pump, thereby effectively reducing the natural gas loss during the subsequent heating of the fresh air flow, saving energy and protecting the environment.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0020] Figure 1 It is a schematic diagram of the utility model.

[0021] Reference numerals:

[0022] 1. Air handling unit; 11. Filter chamber; 12. Circulating water pre-cooling chamber; 13. Cooling chamber; 14. Circulating water heat recovery chamber; 15. Heat recovery chamber; 2. Filter; 21. Plate filter; 22. Bag filter; 3. Heat pump; 31. Compressor; 32. Expansion valve; 4. Fan; 5. Circulating water system; 51. Circulating water pipe; 52. Circulating pump. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "vertical", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the description of the present utility model, "first feature" and "second feature" may include one or more of the features. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0027] like Figure 1A heat pump dehumidification system shown includes: an air handling unit 1, a filter 2, a heat pump 3, a fan 4 and a main control unit.

[0028] The air handling unit 1 includes a filter chamber 11, a cooling chamber 13 and a heat recovery chamber 15 arranged and connected along the air flow direction. Specifically, the air handling unit 1 in this system adopts a box-type structure, the insulation board of the box is 75mm thick, the inner wall plate is SUS304, the thickness is 1mm, the outer wall plate is a color steel plate, the thickness is 0.8mm, and a plurality of functional chambers are arranged in the box, namely, the filter chamber 11, the cooling chamber 13 and the heat recovery chamber 15. The three functional chambers are arranged and connected in sequence along the air flow direction, so that when the air flows, it will first flow through the filter chamber 11 for filtration, then flow through the cooling chamber 13 for cooling and dehumidification, and finally flow through the heat recovery chamber 15 for heating and heat recovery.

[0029] Among them, the filter 2 is arranged in the filter chamber 11. In this system, the filter 2 includes a plate filter 21 and a bag filter 22. Along the flow direction of the airflow, the plate filter 21 is arranged on the upstream side of the bag filter 22, that is, the airflow is first filtered by the plate filter 21, and then filtered by the bag filter 22. The model of the plate filter 21 is G4, and the model of the bag filter 22 is F5. In practical applications, for example, the filter chamber 11 can be divided into two-stage filter chambers 11, the plate filter 21 is arranged in the first-stage filter chamber 11, and the bag filter 22 is arranged in the second-stage filter chamber 11, so as to filter in different functional chambers. Of course, the type, model, quantity, etc. of the filter 2 can also adopt other styles according to actual needs, which is not limited here.

[0030] For cooling, dehumidification and heating of air flow, heat pump 3 is used. Figure 1 As shown, the heat pump 3 includes a compressor 31, a condenser and an evaporator. The compressor 31 is connected to the condenser, the condenser is connected to the evaporator and an expansion valve 32 is provided therebetween. The evaporator is connected to the compressor 31, the evaporator is arranged in the cooling chamber 13, and the condenser is arranged in the heat recovery chamber 15.

[0031] When the heat pump 3 is working, the compressor 31 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant flows to the condenser for condensation and heat release, and becomes a medium-temperature and high-pressure liquid refrigerant. At this time, the air temperature in the space at the condenser rises, and then the medium-temperature and high-pressure liquid refrigerant is throttled by the electronic expansion valve 32 and becomes a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant flows to the evaporator for evaporation and heat absorption, and becomes a low-temperature and low-pressure gaseous refrigerant. At this time, the air temperature in the space at the evaporator decreases, and then the low-temperature and low-pressure gaseous refrigerant enters the compressor 31 again. In this cycle, the refrigerant continuously releases and absorbs heat, completing the supply of heat and cooling required for the production process.

[0032] Since the evaporator is arranged in the cooling chamber 13 and the condenser is arranged in the reheat chamber 15, when the heat pump 3 is working in a cycle, it is equivalent to that the cooling chamber 13 is in a cooling state and the reheat chamber 15 is in a heating state. Therefore, the filtered airflow can be cooled and dehumidified first, and then heated and reheated. Moreover, by using the heat pump 3 for cooling and dehumidification, the fresh air can be dehumidified to below the freezing point, which effectively ensures the dehumidification effect. Then, the heat of the heat pump 3 is used to reheat the fresh air, realizing heat recovery of the heat pump 3, thereby effectively reducing the natural gas loss during the subsequent heating of the fresh air flow.

[0033] In this system, the heat pump 3 pipeline uses environmentally friendly refrigerant R134a, which is a colorless, odorless, non-corrosive gas at room temperature, has zero ozone destruction potential, is non-flammable, and has good thermal and chemical stability. In addition, the pipeline connections between the compressor 31, evaporator, and condenser of the heat pump 3 are all connected by copper pipes, and the exposed copper pipes are wrapped with rubber and plastic, and the flow direction of the pipeline is marked.

[0034] In this system, the compressor 31 of the heat pump 3 adopts the Bitzer brand screw compressor 31CSH series to ensure the reliable operation of the equipment. The built-in energy regulation device can perform 25%-100% step-by-step or stepless energy regulation on the compressor 31. In order to save energy, a direct expansion heat pump 3 heat recovery system is used to provide a cold and heat source for the air handling unit 1. The compressor 31, gas-liquid separator also called heat exchanger, oil separator, pressure switch, liquid storage device and other components of the heat pump 3 are centrally installed in a box. The layout meets the needs of convenient inspection and maintenance, and the strength of the unit box meets the needs of forklift transportation or lifting and handling.

[0035] In this system, a stainless steel water tray is provided at the bottom of the entire box of the air handling unit 1. In the cooling chamber 13, if the temperature of a part of the area is low and a freezing area is formed, the water tray in the area needs to have a heating function. Each functional room of the air handling unit 1 is provided with an inspection door, each inspection door is equipped with an observation window, and each functional section is equipped with a moisture-proof LED lamp with a power of 20W.

[0036] Furthermore, in order to improve the cooling and dehumidification effect and the heating and heat recovery effect, Figure 1 As shown, there are multiple heat pumps 3, the cooling chamber 13 is divided into multiple cooling zones, the evaporators of different heat pumps 3 are arranged in different cooling zones, the reheat chamber 15 is divided into multiple reheat zones, the condensers of different heat pumps 3 are arranged in different reheat zones. Thus, for the airflow, multi-stage cooling and multi-stage reheating can be formed, so as to ensure the dehumidification effect and increase the reheating temperature, thereby reducing the natural gas loss in the subsequent heating of the airflow.

[0037] In this system, three heat pumps 3 are used, the cooling zone is divided into a primary cooling zone, a secondary cooling zone and a tertiary cooling zone, and the reheat zone is divided into a primary reheat zone, a secondary reheat zone and a tertiary reheat zone. Of course, the number of heat pumps 3 and the number of cooling zones and reheat zones can also be adjusted accordingly according to actual needs, and there is no restriction here.

[0038] Furthermore, if Figure 1 As shown, the system further includes a circulating water system 5, the air handling unit 1 also includes a circulating water precooling chamber 12 and a circulating water heat recovery chamber 14, the circulating water precooling chamber 12 is arranged between the filter chamber 11 and the cooling chamber 13, the circulating water heat recovery chamber 14 is arranged between the cooling chamber 13 and the heat recovery chamber 15, the circulating water system 5 includes a circulating water pipe 51 and a circulating pump 52, the circulating water pipe 51 is provided with a circulating pump 52, a part of the circulating water pipe 51 is arranged in the circulating water precooling chamber 12, and a part of the pipe is arranged in the circulating water heat recovery chamber 14.

[0039] Therefore, after being filtered, the airflow will first pass through the circulating water precooling chamber 12 for a preliminary precooling and dehumidification, then flow to the cooling chamber 13 for formal cooling and dehumidification, then flow to the circulating water heat recovery chamber 14 for preliminary heating and heat recovery, and then flow to the heat recovery chamber 15 for formal heating and heat recovery, which helps to reduce the energy consumption of the heat pump 3.

[0040] The main control unit of this system is a PLC controller. The air handling unit 1 has an independent control cabinet with its own Siemens or Mitsubishi PLC controller, which is responsible for the operation of the heat pump dehumidification system, as well as the start and stop, alarm, protection and other functions of the heat pump 3 itself. The start and stop of the heat pump 3 system receives the start and stop control of the upper computer equipment.

[0041] The working process of this system is roughly as follows: the heat pump dehumidification system draws air from the workshop and enters the air handling unit 1, first filtered by the filter 2 to remove mixed workshop impurities, and enters the cooling chamber 13. After cooling and dehumidification, the moisture content reaches 3.0g / kg±0.5, and then passes through the heat recovery chamber 15 for heating and heat recovery, and finally is discharged to the heating element duct through the fan 4.

[0042] Therefore, this scheme mainly adopts the heat pump 3 system for cooling and dehumidification and heating and heat recovery, which can not only dehumidify the fresh air to below the freezing point and ensure that the moisture content of the fresh air flow can reach 3.0g / kg±0.5, but also use the heat of the heat pump 3 to heat the fresh air back and forth, realizing heat recovery of the heat pump 3, thereby effectively reducing the natural gas loss during the subsequent heating of the fresh air flow, saving energy and protecting the environment.

[0043] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat pump dehumidification system, It is characterized in that include: An air handling unit, the air handling unit comprising a filter chamber, a cooling chamber and a reheat chamber arranged and connected along the air flow direction; A filter, wherein the filter is disposed in the filter chamber; A heat pump, the heat pump comprising a compressor, a condenser and an evaporator, the compressor being connected to the condenser, the condenser being connected to the evaporator with an expansion valve arranged therebetween, the evaporator being connected to the compressor, the evaporator being arranged in the cooling chamber, and the condenser being arranged in the heat recovery chamber; A fan connected to an outlet of the reheat chamber; A main control unit, the heat pump and the fan are connected to the main control unit.

2. The heat pump dehumidification system according to claim 1, It is characterized in that The filter comprises a plate filter and a bag filter. Along the flow direction of the airflow, the plate filter is arranged on the upstream side of the bag filter.

3. The heat pump dehumidification system according to claim 1, It is characterized in that A water receiving tray is provided at the bottom of the air handling unit.

4. The heat pump dehumidification system according to claim 3, It is characterized in that The water receiving tray is a heated water receiving tray.

5. The heat pump dehumidification system according to claim 1, It is characterized in that There are multiple heat pumps, the cooling chamber is divided into multiple cooling zones, evaporators of different heat pumps are arranged in different cooling zones, and the heat recovery chamber is divided into multiple heat recovery zones, condensers of different heat pumps are arranged in different heat recovery zones.

6. The heat pump dehumidification system according to claim 1, It is characterized in that It also includes a circulating water system, and the air handling unit also includes a circulating water pre-cooling chamber and a circulating water heat recovery chamber. The circulating water pre-cooling chamber is arranged between the filter chamber and the cooling chamber, and the circulating water heat recovery chamber is arranged between the cooling chamber and the heat recovery chamber. The circulating water system includes a circulating water pipe and a circulating pump. The circulating pump is arranged on the circulating water pipe. A part of the circulating water pipe is arranged in the circulating water pre-cooling chamber, and a part of the pipe is arranged in the circulating water heat recovery chamber.

Images