CN119642286A - Refrigerating and dehumidifying system based on adsorption and desorption module - Google Patents
Refrigerating and dehumidifying system based on adsorption and desorption module Download PDFInfo
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- CN119642286A CN119642286A CN202411979348.XA CN202411979348A CN119642286A CN 119642286 A CN119642286 A CN 119642286A CN 202411979348 A CN202411979348 A CN 202411979348A CN 119642286 A CN119642286 A CN 119642286A
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Abstract
The invention discloses a refrigeration and dehumidification system based on an adsorption and desorption module, which comprises a first heat exchanger, a second heat exchanger and an additional heat exchange unit, wherein the first heat exchanger, the second heat exchanger and the additional heat exchange unit are connected in series and are used for sharing quantitative heat load of the system and reducing indoor temperature rise, the first heat exchanger, the second heat exchanger and the additional heat exchange unit are all arranged on the same air flow path, a moisture adsorption and desorption unit is arranged on the air flow path between the first heat exchanger and the second heat exchanger, the additional heat exchange unit is arranged at the downstream of the second heat exchanger, and the first heat exchanger, the second heat exchanger and the additional heat exchange unit are all communicated with a compressor through a four-way valve and a refrigerant pipeline. The invention can ensure the high-efficiency operation of the industrial dehumidification equipment in the medium-low temperature environment, and can effectively dehumidify while defrosting, thereby reducing the energy consumption of the equipment and achieving the purposes of energy conservation and emission reduction.
Description
Technical Field
The invention relates to an air dehumidifying system, in particular to a refrigerating dehumidifying system based on an adsorption and desorption module.
Background
Under normal temperature environment, the energy-saving effect of the heat pump type dehumidification system is obvious, but the dehumidification amount of the heat pump type dehumidification system is reduced when the heat pump type dehumidification system dehumidifies under low temperature environment. The main reasons are that the evaporator needs to be defrosted after frosting, and the system can not dehumidify during defrosting, so that the energy consumption is high. In addition, the adsorption type dehumidification system can deeply dehumidify in a low-temperature environment, but the regeneration air with the temperature of more than 60 ℃ is needed to desorb the rotating wheel, and the rotating wheel is heated by an electric heater generally, so that the energy-saving effect is difficult to achieve.
The adsorption and desorption unit is an important part for absorbing moisture in the dehumidifier, and can be formed by a corrugated medium made of special composite heat-resistant materials, wherein a drying agent (high polymer materials, high-efficiency active silica gel and the like) is loaded in the corrugated medium, as shown in figure 1. This design is compact and provides a large dehumidifying surface, as the moist air (process air) enters the adsorption unit, water molecules in the air are absorbed by the moisture absorbent in the unit, and the moisture content of the processed air is greatly reduced. When the material in the adsorption and desorption unit absorbs enough water molecules and becomes saturated, the water molecules in the unit are carried out through high-temperature air, the wet air is changed into hot air and then discharged outdoors by a fan, and the dehumidification purpose is achieved through periodically switching the treated air and the high-temperature air, and the principle is shown in figure 2.
The basic principle of condensation dehumidification is that by utilizing the cooling effect of a refrigerant, the temperature of air is reduced (the dew point temperature is reached), so that water vapor in the air is condensed into water drops, and then the water drops are collected, thereby achieving the dehumidification effect, and the specific process is as follows:
Cooling process humid air first enters the evaporator (cooler). The evaporator tubes are filled with a refrigerant which absorbs heat from the air and rapidly reduces the temperature of the air.
Moisture condensation-as the temperature of the air decreases, the water vapor in the air begins to condense into droplets as the temperature drops below the dew point temperature. These droplets will adhere to the surface of the cooler and accumulate in the condensation plate.
And (3) draining, namely draining the condensed water drops to the outside through a drain pipe, or optionally collecting the water drops indoors according to the design of the dehumidifier.
Heating (optional) in order to prevent the temperature of dehumidified air from being too low, some dehumidifiers will slightly heat during dehumidification, making the treated air more comfortable.
And finally, the dried air after cooling and dehumidifying (and heating in some cases) is sent back to the room again, so that the humidity in the room is effectively reduced, and the principle is shown in figure 3.
The mixed low-temperature frostless dehumidification system consists of a heat exchanger 1, a heat exchanger 2, an adsorption and desorption dehumidification module, a four-way valve, an expansion valve, a compressor and the like. As shown in fig. 4, the expansion valve is located between the heat exchanger 1 and the heat exchanger 2, and the four-way valve switches the evaporator function and the condenser function of the heat exchanger 1 and the heat exchanger 2 at regular intervals. The adsorbent loaded in the adsorption and desorption unit is a high molecular adsorption material capable of being regenerated at low temperature, and the adsorption and desorption dehumidification module can be regenerated by utilizing heat removal during defrosting of the condenser, so that the energy efficiency of the system is improved while the dehumidification amount is increased. The adsorption process of the system is shown in fig. 5, the heat exchanger 1 is used as an evaporator, the heat exchanger 2 is used as a condenser, when air with high humidity flows into the heat exchanger 1, the air is condensed and dehumidified, then flows through an adsorption and desorption unit, moisture in the air is further adsorbed and removed, then low-temperature low-humidity air enters the heat exchanger 2 to be heated, and finally the air is fed into a room.
The desorption process of the mixed low-temperature frostless dehumidification system is shown in fig. 6, the heat exchanger 2 is used as an evaporator, the heat exchanger 1 is used as a condenser, when air flows through the heat exchanger 1, heated air passes through the adsorption and desorption unit, water molecules adsorbed in the adsorption mode are desorbed into the air, so that the air is humidified to become high-relative-humidity air, the high-relative-humidity air is condensed and dehumidified when the air passes through the heat exchanger 2, and finally the low-temperature low-humidity air is sent into a room.
The heat exchanger 1 acts as a condenser during desorption, and the heat of condensation thereof will defrost the frost produced during adsorption. On the other hand, the relative humidity of the air flowing into the heat exchanger 2 is much higher than that of the inlet air due to the desorption of the adsorbent by the adsorption and desorption unit, thereby increasing the amount of dehumidification. Compared with the heat pump type dehumidification system which does not play a dehumidification role in the defrosting process, the system utilizes the desorption mode of the adsorption and desorption unit to humidify air and dehumidifies the air through the evaporator.
However, the hybrid low-temperature frostless dehumidification system has two major problems that (1) the size of an evaporator in an air conditioning system is usually much smaller than that of a condenser to maintain the optimal design of the system, and the system has the same size as that of the condenser, and (2) when the heat exchanger 2 is used as the evaporator for dehumidification in the desorption process, the temperature of air at the outlet of the heat exchanger 2 is too low, so that the preset temperature of a room is disturbed.
Disclosure of Invention
The invention aims to provide a refrigeration and dehumidification system based on an adsorption and desorption module, which solves the problems of frosting phenomenon of an evaporator and efficiency reduction caused by defrosting operation in a heat pump type dehumidification system existing in the existing dehumidification system.
The refrigeration and dehumidification system comprises a first heat exchanger, a second heat exchanger and an additional heat exchange unit, wherein the first heat exchanger, the second heat exchanger and the additional heat exchange unit are connected in series, the additional heat exchange unit is used for sharing quantitative heat load of the system and reducing indoor temperature rise, the first heat exchanger, the second heat exchanger and the additional heat exchange unit are all arranged on the same air flow path, a moisture adsorption and desorption unit is arranged on the air flow path between the first heat exchanger and the second heat exchanger, the additional heat exchange unit is arranged at the downstream of the second heat exchanger, and the first heat exchanger, the second heat exchanger and the additional heat exchange unit are all communicated with a compressor through a four-way valve and a refrigerant pipeline.
Preferably, the additional heat exchange unit comprises two heat exchangers which are arranged in parallel, a stop valve is arranged between the two heat exchangers, one heat exchanger is arranged indoors and located at the downstream of the second heat exchanger, the other heat exchanger is arranged outdoors, and the two heat exchangers are respectively communicated with the four-way valve and the compressor through three-way pipes.
The invention adopts split arrangement, additionally adds two heat exchangers as condensers, dehumidifies mainly through an indoor air circulation device, and balances the heat load of rooms mainly through an outdoor unit. Not only can effectively avoid the frosting phenomenon of an evaporator in a heat pump type dehumidification system, but also can prevent the problem of efficiency reduction caused by defrosting operation. Through the combined design of a plurality of heat exchangers, the dehumidification effect is effectively increased, and the heat load generated by the indoor condenser is reduced, so that the indoor condenser has good dehumidification and energy-saving characteristics.
Preferably, the outdoor heat exchanger is provided with a heat dissipation assembly.
Preferably, the first heat exchanger is communicated with the second heat exchanger through an expansion valve and a refrigerant pipeline.
Preferably, the moisture absorption and desorption unit is adapted to absorb or release moisture from or into the gas stream as it passes through the unit.
Preferably, the moisture absorption and desorption unit is provided with a high molecular adsorption material capable of being regenerated at low temperature.
Preferably, at least one of the moisture absorption and desorption unit, the first heat exchanger and the second heat exchanger is provided with a device for driving the gas to flow unidirectionally.
Compared with the prior art, the invention has the following remarkable advantages:
the invention adopts split installation, and solves the problems of frosting phenomenon of an evaporator and efficiency reduction caused by defrosting operation in the heat pump type dehumidification system existing in the existing dehumidification system by utilizing the effective combination of the heat pump system and the adsorption and desorption module. The invention can ensure the high-efficiency operation of the industrial dehumidification equipment in the medium-low temperature environment, and can effectively dehumidify while defrosting, thereby reducing the energy consumption of the equipment and achieving the purposes of energy conservation and emission reduction.
Drawings
FIG. 1 is a schematic diagram of a structure of a moisture adsorbing and desorbing unit;
fig. 2 is a schematic diagram of the principle of the moisture adsorption and desorption unit for adsorbing or desorbing moisture;
FIG. 3 is a schematic diagram of the operation of a condensing dehumidification system;
FIG. 4 is a schematic diagram of a hybrid low temperature frostless dehumidification system;
FIG. 5 is a schematic diagram of a moisture adsorption process of a hybrid low temperature frostless dehumidification system;
FIG. 6 is a schematic diagram of a moisture desorption process of a hybrid low temperature frostless dehumidification system;
FIG. 7 is a schematic diagram of a refrigeration and dehumidification system according to the present invention;
FIG. 8 is a schematic view of the moisture adsorption process of the present invention;
FIG. 9 is a diagram of the psychrometric chart of the moisture adsorption process of the present invention;
FIG. 10 is a schematic diagram of a moisture desorption process according to the present invention;
Fig. 11 is a diagram of the enthalpic humidity of the moisture desorption process of the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
Embodiment 1A refrigerating and dehumidifying system based on an adsorption and desorption module is shown in fig. 7, and mainly comprises a heat exchanger 1, a heat exchanger 2, a heat exchanger 3, a heat exchanger 4, a moisture adsorption and desorption unit, a four-way valve, an expansion valve, a compressor and the like.
The heat exchanger 3 and the heat exchanger 4 are connected in parallel to form an additional heat exchange unit, and the additional heat exchange unit is used for sharing the quantitative heat load of the system and reducing the indoor temperature rise. The heat exchanger 1, the heat exchanger 2 and the additional heat exchange unit are connected with the compressor in series through the four-way valve and the refrigerant pipeline, the heat exchanger 1, the heat exchanger 2 and the heat exchanger 3 are all arranged on the same air flow path, the moisture absorption and desorption unit is arranged on the air flow path between the heat exchanger 1 and the heat exchanger 2, and the heat exchanger 3 is arranged at the downstream of the heat exchanger 2. The heat exchanger 3 is provided with a stop valve, and the heat exchanger 3 and the heat exchanger 4 are respectively communicated with the four-way valve and the compressor through three-way pipes. The heat exchanger 4 is arranged outdoors, and the heat exchanger 1, the heat exchanger 2, the heat exchanger 3 and the moisture absorption and desorption unit are all arranged indoors. A fan or other air driving device for driving air to flow is arranged on the air flow path. The fan may be provided at one side of the heat exchanger 1 or the heat exchanger 2, or the moisture absorption and desorption unit may be designed in a rotor shape to drive air flow.
The expansion valve is positioned between the heat exchanger 1 and the heat exchanger 2, and the four-way valve switches the evaporator function and the condenser function of the heat exchanger 1 and the heat exchanger 2 at regular intervals. The heat exchanger 4 is used as a heat rejection condenser, and the heat exchanger 3 is opened and closed by a stop valve according to the system requirement and is used as a condenser. The adsorbent in the moisture absorption and desorption unit is a high molecular adsorption material capable of regenerating at low temperature, and the heat rejection during defrosting of the condenser is utilized to regenerate the moisture absorption and desorption unit, so that the energy efficiency of the system can be effectively improved.
The regeneration process of the moisture adsorption and desorption unit is alternately and circularly completed by a moisture adsorption process and a moisture desorption process, wherein the moisture adsorption process is shown in fig. 8, and the specific implementation manner is as follows:
The heat exchanger 1 is controlled to serve as an evaporator, the heat exchanger 2 and the heat exchanger 4 serve as condensers, the heat exchanger 3 is in a closed state at the moment, the heat exchanger 2 serving as a condenser can properly heat and raise the temperature of air, when high-humidity air flows into the heat exchanger 1, the air is cooled, condensed and dehumidified, then the air flows into the moisture absorption and desorption unit, moisture in the air is absorbed and fixed by an adsorbent in the moisture absorption and desorption unit, and the air is further dehumidified when the air flows through the moisture absorption and desorption unit. The low-temperature and low-humidity air enters the heat exchanger 2 to be heated, and finally is sent into the room. The heat exchanger 4 is arranged outdoors and used as a condenser, the main function of the heat exchanger 4 is to share the quantitative heat load of the system with the heat exchanger 2, and the heat load in the room is not increased, so that the temperature rise of the room can be reduced.
It can be seen from the psychrometric chart (fig. 9) that the a process corresponds to cooling dehumidification (air passing through the heat exchanger 1) to a dew point temperature, the air humidity rises to 100%, the water vapor condenses into water, the b process corresponds to adsorption dehumidification (air passing through the adsorption and desorption unit), the adsorption process changes along the isenthalpic line, the c process corresponds to heating (air passing through the heat exchanger 2), the temperature of the air rises, the relative humidity drops, and the d process corresponds to outdoor heating (air passing through the heat exchanger 4), the temperature of the air discharged from the outside rises, but the heat load of the room is not increased.
The moisture desorption process is shown in fig. 10, and the specific implementation manner is as follows:
By switching the four-way valve, the heat exchanger 1 becomes a condenser, the heat exchanger 2 becomes an evaporator, the heat exchanger 3 and the heat exchanger 4 serve as condensers, when air flows into the heat exchanger 1, the heated air is heated, the moisture of the adsorbent is desorbed when the heated air flows through the moisture adsorption and desorption unit, at the moment, the water molecules adsorbed in the adsorption mode are desorbed by the hot air, which is equivalent to humidifying the hot air into high-relative-humidity air, and the high-relative-humidity air enters the heat exchanger 2, and after condensing and dehumidifying the high-relative-humidity air by the heat exchanger 2, the low-temperature low-humidity air enters the heat exchanger 3 to be heated, and finally is sent into a room. The heat exchanger 4 is arranged outdoors and also serves as a condenser, and the heat exchanger 4 has the main function of sharing the quantitative heat load of the system with the heat exchanger 3, so that the heat load in a room is not increased, and the temperature rise of the room can be reduced.
The heat exchanger 1 becomes a condenser during desorption, and the condensation heat thereof will defrost frost generated during adsorption. On the other hand, the relative humidity of the air flowing into the heat exchanger 2 (which now functions as an evaporator) is much higher than that of the air flowing into the heat exchanger 1 due to the moisture desorption action of the adsorbent in the moisture adsorption-desorption unit, thereby increasing the amount of dehumidification. That is, the present apparatus can also achieve effective dehumidification by utilizing the desorption action of the adsorption and desorption unit, and finally achieve high-efficiency dehumidification, with respect to the defrosting process that does not play a role in dehumidification when the heat pump type dehumidification system.
It can be seen from the psychrometric chart (fig. 11) that the a process corresponds to heating (air passing through the heat exchanger 1) and the temperature of the air increases and the relative humidity decreases, the b process corresponds to desorption humidification (air passing through the moisture adsorption and desorption unit) and the desorption process changes along the isenthalpic line, the c process corresponds to cooling and dehumidification (air passing through the heat exchanger 2) and the temperature of the air decreases to reach the dew point temperature and the air humidity increases to 100%, water vapor condenses into water, the d process corresponds to heating (air passing through the heat exchanger 3), the e process corresponds to outdoor heating (air passing through the heat exchanger 4) and the temperature of the air discharged from the outside increases, but the heat load of the room is not increased.
Claims (7)
1. The refrigeration dehumidification system is characterized by comprising a first heat exchanger, a second heat exchanger and an additional heat exchange unit, wherein the first heat exchanger, the second heat exchanger and the additional heat exchange unit are connected in series, the additional heat exchange unit is used for sharing quantitative heat load of the system and reducing indoor temperature rise, the first heat exchanger, the second heat exchanger and the additional heat exchange unit are all arranged on the same air flow path, a moisture absorption and desorption unit is arranged on the air flow path between the first heat exchanger and the second heat exchanger, the additional heat exchange unit is arranged at the downstream of the second heat exchanger, and the first heat exchanger, the second heat exchanger and the additional heat exchange unit are all communicated with a compressor through a four-way valve and a refrigerant pipeline.
2. The refrigeration and dehumidification system of claim 1, wherein the additional heat exchange unit comprises two heat exchangers arranged in parallel, a stop valve is arranged between the two heat exchangers, one heat exchanger is arranged indoors and positioned downstream of the second heat exchanger, the other heat exchanger is arranged outdoors, and the two heat exchangers are respectively communicated with the four-way valve and the compressor through three-way pipes.
3. The refrigeration and dehumidification system of claim 1, wherein the outdoor heat exchanger is provided with a heat sink assembly.
4. The refrigeration and dehumidification system of claim 1, wherein the first heat exchanger and the second heat exchanger are in communication with a refrigerant conduit through an expansion valve.
5. A refrigeration and dehumidification system as recited in claim 1 wherein the moisture absorption and desorption unit is adapted to absorb moisture from or release moisture to the air stream as it passes through the unit.
6. The refrigeration and dehumidification system according to claim 1, wherein the moisture absorption and desorption unit is provided with a polymer adsorption material capable of regenerating at a low temperature.
7. A refrigeration and dehumidification system as set forth in claim 1 wherein at least one of said moisture absorption and desorption unit, first heat exchanger and second heat exchanger is provided with means for driving the unidirectional flow of gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411979348.XA CN119642286A (en) | 2024-12-31 | 2024-12-31 | Refrigerating and dehumidifying system based on adsorption and desorption module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411979348.XA CN119642286A (en) | 2024-12-31 | 2024-12-31 | Refrigerating and dehumidifying system based on adsorption and desorption module |
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| CN119642286A true CN119642286A (en) | 2025-03-18 |
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| CN202411979348.XA Pending CN119642286A (en) | 2024-12-31 | 2024-12-31 | Refrigerating and dehumidifying system based on adsorption and desorption module |
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| CN (1) | CN119642286A (en) |
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- 2024-12-31 CN CN202411979348.XA patent/CN119642286A/en active Pending
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