CN210532731U - Hierarchical air treatment system - Google Patents
Hierarchical air treatment system Download PDFInfo
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- CN210532731U CN210532731U CN201920795619.4U CN201920795619U CN210532731U CN 210532731 U CN210532731 U CN 210532731U CN 201920795619 U CN201920795619 U CN 201920795619U CN 210532731 U CN210532731 U CN 210532731U
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Abstract
A hierarchical air treatment system comprises N stages of treatment units, wherein each stage of the front N-1 stage of treatment units comprises a two-in-one heat pump unit and an air-secondary refrigerant heat exchanger module; the one-to-two heat pump unit comprises a compressor, a four-way reversing valve, two electronic expansion valves and two dividing wall type heat exchangers, and is connected through branch pipelines to form a refrigeration/heat loop; the last stage 1 treatment unit includes a one-band heat pump unit and an air-to-coolant heat exchanger module. The natural energy collecting device is connected with the 1 st stage processing unit through a water pump; after the 1 st stage, the adjacent two stages of treatment units are connected in sequence through the dividing wall type heat exchanger, and the air is treated in the treatment units from the 1 st stage to the last 1 st stage in a cascade mode. The system is based on the idea of load classification, the loads are classified according to a certain temperature difference, the temperatures of the multiple groups of heat pump units are sequentially reduced from the 1 st level to the N level in summer, and the temperatures of the multiple groups of heat pump units are sequentially increased from the 1 st level to the N level in winter, so that the overall energy efficiency of the system is effectively improved.
Description
Technical Field
The utility model relates to an air treatment system, in particular to system and method for carrying out classification treatment on air by utilizing a heat pump unit, which belong to the field of heat supply and air conditioning.
Background
The traditional air treatment unit usually adopts a single cold and heat source to treat air (wherein the temperature of supply and return water in summer is 7/12 ℃, and the temperature of supply and return water in winter is 50/40 ℃). In the air treatment process, only the load amount is considered, and the grade of the load is not considered. The load is also of a grade in practice, and the load can be classified according to a certain temperature difference. Loads of different levels can be processed by cold and heat sources of different temperature grades, so that the overall energy efficiency of the system is improved, and the energy consumption is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a graded air treatment system aiming at the problems of higher energy consumption grade and energy waste of the traditional heat supply air conditioning system in the air treatment mode; so that loads of different levels can be processed by cold and heat sources of different temperature grades, thereby reducing energy consumption and further improving the overall energy efficiency of the system.
The technical scheme of the utility model as follows:
a hierarchical air handling system comprises a natural energy collecting device, a heat pump air handling unit, an air channel, a fan, an air inlet and an air outlet, and is characterized in that the heat pump air handling unit comprises N stages of handling units, and each stage of the front N-1 stages of handling units comprises a two-by-one heat pump unit and an air-secondary refrigerant heat exchanger module; the one-to-two heat pump unit comprises a compressor, a four-way reversing valve, two electronic expansion valves and two dividing wall type heat exchangers; the air-secondary refrigerant heat exchanger module is arranged in the air channel; the one-driving-two heat pump unit and the air-secondary refrigerant heat exchanger module are connected through a branch pipeline to form a refrigerating or heating circulation loop; the final stage 1 treatment unit comprises a one-by-one heat pump unit and an air-secondary refrigerant heat exchanger module; the one-with-one heat pump unit comprises a compressor, a four-way reversing valve, a dividing wall type heat exchanger and an electronic expansion valve; the compressor, the four-way reversing valve, the dividing wall type heat exchanger, the electronic expansion valve and the air-secondary refrigerant heat exchanger module are sequentially connected to form a refrigeration or heating circulation loop; the natural energy collecting device is connected with the 1 st stage processing unit through a water pump; from the 1 st stage, the adjacent two stages of treatment units are sequentially connected through a dividing wall type heat exchanger; a gradient forming air staging system.
The utility model discloses another technical characteristic is: the system also comprises an air pretreatment unit, wherein the air pretreatment unit is arranged between the natural energy collecting device and the 1 st-stage treatment unit; the air pretreatment unit comprises a regulating valve, a connecting pipeline and an air-water heat exchanger arranged in an air channel; the natural energy collecting device is connected with the air-water heat exchanger through a water pump, a regulating valve and a connecting pipeline to form an air preheating circulation loop.
In the above technical scheme, the energy collected by the natural energy collection device is low-grade energy, and the low-grade energy comprises cooling tower effluent, surface water, underground water or ground heat exchanger effluent.
The utility model has the advantages of ① based on the thought of load classification, classifying the load according to a certain temperature difference, summer low-grade cold load is handled with the high temperature cold source, high-grade cold load is handled with the low temperature cold source, winter low-grade heat load is handled with the low temperature heat source, high-grade heat load is handled with the high temperature heat source, ⑵ summer multiunit one drags two heat pump unit's evaporimeter temperature to reduce from 1-N level in proper order, winter multiunit one drags two heat pump unit's condenser temperature to rise from 1-N level in proper order, the classification treatment air, realize the energy cascade utilization, improve whole system's efficiency ③ gathers low-grade natural energy and carries out the preliminary treatment to the air, can be with the natural cold source precooling air that is less than the temperature of inlet air summer, can be with the natural heat source preheating air that is higher than the inlet air winter.
In general, the technical scheme can fully utilize low-grade natural energy to efficiently process air in a grading manner, the energy grade corresponds to the energy utilization, and the overall energy consumption of the system is obviously reduced.
Drawings
Fig. 1 is a schematic view of the structural principle of a staged air treatment system according to the present invention.
Fig. 2 is a schematic diagram of a staged air treatment system with an air pre-treatment unit.
The figures are labeled as follows: 1-an air inlet; 2-a natural energy collection device; 3-a water pump; 5-a compressor; a 6-four-way reversing valve; 7-dividing wall type heat exchanger; 8-an electronic expansion valve; 9-air channel; 10-air outlet; 11-an air-coolant heat exchanger module; 12-a fan; 13-one-to-two heat pump unit; 14-with-a heat pump unit; 15-air-water heat exchanger.
Detailed Description
The structure, the working principle and the operation mode of the present invention are further explained with reference to the accompanying drawings as follows:
fig. 1 is a schematic diagram of the structural principle of a staged air treatment system disclosed in the present invention. The grading air treatment system comprises a natural energy collecting device 2, a heat pump air treatment unit, an air channel 9, a fan 12, an air inlet 1 and an air outlet 10; the heat pump air treatment unit comprises N stages of treatment units, wherein each stage of the front N-1 stage of treatment units comprises a one-to-two heat pump unit 13 and an air-secondary refrigerant heat exchanger module 11; the one-driving-two heat pump unit comprises a compressor 5, a four-way reversing valve 6, two electronic expansion valves 8 and two dividing wall type heat exchangers 7; the air-secondary refrigerant heat exchanger module 11 is arranged in the air channel 9; the one-driving-two heat pump unit and the air-secondary refrigerant heat exchanger module 11 are connected through branch pipelines to form a refrigerating or heating circulation loop.
The last stage 1 treatment unit, which is slightly different from the treatment units preceding it, includes a single-band heat pump unit 14 and an air-to-coolant heat exchanger module 11; the one-with-one heat pump unit 14 comprises a compressor, a four-way reversing valve, a dividing wall type heat exchanger 7 and an electronic expansion valve; the compressor 5, the four-way reversing valve 6, the dividing wall type heat exchanger 7, the electronic expansion valve 8 and the air-secondary refrigerant heat exchanger module 11 are sequentially connected to form a refrigerating or heating circulation loop.
The natural energy collecting device 2 is connected with the 1 st stage processing unit through a water pump 3; from the 1 st stage, the adjacent two stages of treatment units are connected in sequence through the dividing wall type heat exchanger 7, so that the air is treated in a cascade mode in the multi-stage treatment units.
In the system, the energy collected by the natural energy collecting device is low-grade energy, and the low-grade energy can be cooling tower effluent, surface water, underground water or ground heat exchanger effluent and the like.
The working principle is as follows: under the refrigeration working condition, the natural energy collected by the natural energy collecting device 2 is conveyed into the dividing wall type heat exchanger of the 1 st-stage one-driving-two heat pump unit 13 through the water pump 3, indirect heat exchange is carried out on the natural energy and a high-pressure high-temperature refrigerant compressed by the compressor, the heat of the refrigerant is taken away, and the natural energy is used as a heat sink of the whole system. After being cooled, the high-pressure high-temperature refrigerant is further decompressed and cooled by the two electronic expansion valves 8 and respectively enters the air-secondary refrigerant heat exchanger module 11 and the dividing wall type heat exchanger 7. The low-temperature refrigerant exchanges heat with air in the air-secondary refrigerant heat exchanger module 11, and the air is cooled. The low-temperature refrigerant in the dividing wall type heat exchanger 7 exchanges heat with the high-temperature high-pressure refrigerant in the 2 nd-stage one-driving-two heat pump unit 13, and the heat of the high-temperature high-pressure refrigerant in the 2 nd-stage one-driving-two heat pump unit 13 is taken away. The 2 nd-stage one-driving-two heat pump unit 13 adopts the same working principle, and the process is repeated until the Nth stage, and the high-temperature and high-pressure refrigerant in the one-driving-one heat pump unit 14 is cooled by the refrigerant of the N-1 th stage, is subjected to pressure reduction and temperature reduction by an electronic expansion valve 8, and directly enters the air-secondary refrigerant heat exchanger module 11 to exchange heat with air to serve as the last stage of air cooling treatment. Under the refrigeration working condition, the temperatures of the 1 st to N-th-stage air-secondary refrigerant heat exchanger modules 11 are sequentially reduced, and the gradient cooling of air is realized from the air inlet 1 to the air outlet 10.
The four-way reversing valve is switched to a heating working condition, and under the heating working condition, natural energy collected by the natural energy collecting device 2 is conveyed into the dividing wall type heat exchanger of the 1 st-stage one-driving-two heat pump unit 13 through the water pump and indirectly exchanges heat with a low-pressure low-temperature refrigerant in the heat pump unit. The refrigerant absorbs heat from the natural energy source, which acts as the heat source for the entire system. The low-pressure low-temperature refrigerant absorbs heat and is heated, then enters the compressor to be compressed into high-pressure high-temperature refrigerant, and then enters the air-secondary refrigerant heat exchanger module 11 and the dividing wall type heat exchanger 7 through the two branch pipelines respectively. The high temperature refrigerant exchanges heat with air in the air-secondary refrigerant heat exchanger module 11 to heat the air. The high-temperature refrigerant in the dividing wall type heat exchanger 7 exchanges heat with the low-temperature refrigerant in the 2 nd-stage one-driving-two heat pump unit 13, and heat is transferred to the low-temperature refrigerant in the 2 nd-stage one-driving-two heat pump unit 13. The two high-temperature refrigerants exchange heat in the air-secondary refrigerant heat exchanger module 11 and the dividing wall type heat exchanger 7, are reduced in pressure and temperature by the electronic expansion valve 8 on each branch, and finally are converged to complete the whole cycle. The 2 nd-stage one-to-two heat pump unit 13 adopts the same working principle, and the like, until the Nth stage, after absorbing the heat of the refrigerant of the N-1 st stage by the low-temperature refrigerant in the one-to-one heat pump unit 14, the low-temperature refrigerant enters the compressor to be compressed into high-pressure high-temperature refrigerant, and directly enters the air-secondary refrigerant heat exchanger module 11 to exchange heat with air to serve as the last stage of air heating treatment. Under the heating working condition, the temperatures of the 1 st to N th-stage air-secondary refrigerant heat exchanger modules 11 are increased in sequence. The air is heated in a gradient manner from the air inlet 1 to the air outlet 10.
Fig. 2 is a schematic diagram of a staged air treatment system with an air pre-treatment unit. When the air temperature is relatively high in summer and the low-grade natural energy can be used as a cold source, or when the air temperature is relatively low in winter and the low-grade natural energy can be used as a heat source, the graded air treatment system can be additionally provided with an air pretreatment unit for air cooling or air heating. The air pre-treatment unit comprises a regulating valve, a connecting pipeline and an air-water heat exchanger 15 arranged in the air channel 9; the natural energy collecting device 2 is connected with the air-water heat exchanger 15 through the water pump 3, the regulating valve and the connecting pipeline to form an air pretreatment circulation loop as the 0 th level of air treatment.
The working process is as follows: when the temperature of an air inlet is relatively high and the temperature of low-grade natural energy is proper in summer and can be directly used as an initial cold source, the arranged air pretreatment unit is used as the 0 th level of air treatment, and the natural energy is directly used for air pre-cooling. When the air temperature is relatively low and low-grade natural energy can be used as a heat source in winter, a branch pipeline can be arranged to be connected into the air pretreatment unit and used as the 0 th level of air treatment for air preheating. When the low-grade natural energy has proper temperature and can be used as a cold and heat source for air pretreatment, the branch pipeline valve is opened, and a part of the natural energy is connected into the air-water heat exchanger 15 for pretreating air. And if the temperature of the low-grade natural energy is not suitable to be used as a cold and heat source for air pretreatment, closing the branch pipeline valve. The working principle of the 1 st to N stages is the same as that of the figure 1.
Claims (2)
1. A hierarchical air treatment system comprises a natural energy collecting device (2), a heat pump air treatment unit, an air channel (9), a fan (12), an air inlet (1) and an air outlet (10), and is characterized in that the heat pump air treatment unit comprises N stages of treatment units, wherein each stage of the front N-1 stage of treatment units comprises a one-to-two heat pump unit (13) and an air-secondary refrigerant heat exchanger module (11); the one-driving-two heat pump unit comprises a compressor (5), a four-way reversing valve (6), two electronic expansion valves (8) and two dividing wall type heat exchangers (7); the air-secondary refrigerant heat exchanger module (11) is arranged in the air channel (9); the one-driving-two heat pump unit and the air-secondary refrigerant heat exchanger module (11) are connected through a branch pipeline to form a refrigeration or heating circulation loop;
the last stage 1 treatment unit comprises a one-by-one heat pump unit (14) and an air-coolant heat exchanger module (11); the one-with-one heat pump unit (14) comprises a compressor, a four-way reversing valve, a dividing wall type heat exchanger (7) and an electronic expansion valve; the compressor, the four-way reversing valve, the dividing wall type heat exchanger, the electronic expansion valve and the air-secondary refrigerant heat exchanger module (11) are sequentially connected to form a refrigeration or heating circulation loop; the natural energy collecting device (2) is connected with the 1 st stage processing unit through a water pump (3); from the 1 st stage, the adjacent two stages of treatment units are connected in sequence through a dividing wall type heat exchanger (7) to form a gradient air grading treatment system.
2. A staged air treatment system according to claim 1, wherein the system further comprises an air pre-treatment unit disposed between the natural energy harvesting device (2) and the stage 1 treatment unit; the air pretreatment unit comprises a regulating valve, a connecting pipeline and an air-water heat exchanger (15) arranged in an air channel (9); the natural energy collection device (2) is connected with the air-water heat exchanger (15) through the water pump (3), the regulating valve and the connecting pipeline to form an air preheating circulation loop.
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| CN201920795619.4U CN210532731U (en) | 2019-05-29 | 2019-05-29 | Hierarchical air treatment system |
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| CN201920795619.4U CN210532731U (en) | 2019-05-29 | 2019-05-29 | Hierarchical air treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110145887A (en) * | 2019-05-29 | 2019-08-20 | 清华大学 | A kind of classification air treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145887A (en) * | 2019-05-29 | 2019-08-20 | 清华大学 | A kind of classification air treatment system |
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