CN110749018A - Single-machine two-stage compression middle air exhaust heat recovery fresh air processing device - Google Patents
Single-machine two-stage compression middle air exhaust heat recovery fresh air processing device Download PDFInfo
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- 238000011084 recovery Methods 0.000 title claims abstract description 58
- 230000006835 compression Effects 0.000 title claims abstract description 20
- 238000007906 compression Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 67
- 239000003507 refrigerant Substances 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000005057 refrigeration Methods 0.000 claims abstract description 46
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 33
- 238000009833 condensation Methods 0.000 claims abstract description 24
- 230000005494 condensation Effects 0.000 claims abstract description 24
- 239000000498 cooling water Substances 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 238000004378 air conditioning Methods 0.000 claims description 5
- 230000001939 inductive effect Effects 0.000 claims description 2
- 238000003303 reheating Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000009290 primary effect Effects 0.000 abstract description 3
- 238000007791 dehumidification Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000005485 electric heating Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000012864 cross contamination Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
- F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a single-machine two-stage compression middle air exhaust heat recovery fresh air treatment device which comprises an independent refrigeration structure and a cold and hot dual-purpose structure, and further comprises a single-machine two-stage compressor, a conventional condenser, a fan, a first liquid storage device, a first refrigeration throttling device, an evaporator, a gas-liquid separator, a refrigerant flow control valve, a heat recovery condenser, a second liquid storage device, a second refrigeration throttling device, a central cold and hot water surface heat exchanger, a middle-effect filter, a primary-effect filter, a high-efficiency filter, a cooling water circulating pump, a cooling tower, a four-way reversing valve, a one-way valve, a heating liquid storage device and a heating throttling device. The invention utilizes the principle of single-machine two-stage compression intercooling, can remarkably improve the energy efficiency ratio of the system while recovering part of condensation heat for reheating fresh air, has simple system and high control precision, and can effectively solve the problem of high energy consumption of fresh air treatment in high-humidity areas in the south-middle China.
Description
Technical Field
The invention relates to a fresh air processing device, in particular to a single-machine two-stage compression middle air extraction heat recovery fresh air processing device, and belongs to the technical field of air conditioning.
Background
The central and south areas of China have high humidity climate characteristics, and are humid and stuffy in summer, and an air conditioning system usually needs to process air to a state point far lower than the air supply temperature in order to meet the dehumidification quantity requirement caused by fresh air and indoor humidity load. Thus, the temperature of the supplied air is guaranteed, and air reheating is a necessary measure. Especially in the fields of biology, medical treatment and sanitation, in many occasions, in order to avoid bacterial breeding and ensure indoor cleanliness, a fan coil needs to run in a dry mode, fresh air is required to bear all moisture load, and the moisture removal capacity is larger. More demanding applications even require the use of a completely fresh air system to avoid cross contamination of the air. The fresh air treatment system has the advantages of large fresh air demand, large refrigeration and dehumidification capacity, high reheating energy consumption and low refrigeration water temperature, and is a typical characteristic of the fresh air treatment process in the occasions.
The traditional fresh air processing device adopts the following modes to realize air heat and humidity treatment:
(1) adopting a central water chilling unit and electric heating: the method is low in cost, simple in system and high in control precision, but the temperature of supply water and return water of the central water chilling unit is generally 7-12 ℃, water is usually supplied to the central water chilling unit to be higher than 7 ℃ after unavoidable refrigeration capacity loss such as pipeline heating and water pump heating, and the refrigerant can not meet the low-temperature requirement required by cooling dehumidification; the electric heating is adopted to directly consume primary energy, so that the energy utilization efficiency is low and the operation cost is high; meanwhile, a large amount of condensation heat is directly discharged to the environment, so that heat is wasted, and the formation of an urban heat island effect is aggravated.
(2) Adopting an independent refrigerating unit and electric heating: the mode is also economical, the system is simple and high in control precision, the independent refrigerating unit can meet the low-temperature requirement for cooling and dehumidifying, and the problems of low energy utilization efficiency and poor economic performance are still not solved. And the condensation heat is not recycled.
(3) Adopting an independent refrigerating unit and a boiler: this approach has certain limitations, typically in situations where hot water or steam is required throughout the year. The gas or oil-fired boiler is adopted to replace direct electric heating, the energy utilization efficiency is improved, the operation cost is lower than that of direct electric heating, but the condensation heat of the refrigeration system directly exhausting air outwards is still not recycled, and the comprehensive economy is still poor.
In order to save energy and reduce the heat pollution caused by condensation heat to the surrounding environment, the mode of applying condensation heat recovery to fresh air treatment gradually gains attention of people, and the condensation heat recovery technology applied to the fresh air treatment process at present can be summarized into the following types:
(1) recovering condensation heat to produce hot water: the hot water is produced by the condensation heat of the refrigerating unit in a partial heat recovery mode, and then the hot water is sent to a fresh air treatment device through a hot water transmission and distribution pipe network to replace an electric boiler or a boiler to carry out reheating treatment on fresh air. Although this method recovers the condensation heat, it adds one more hot water cycle, which makes the system more complicated. Meanwhile, two-stage heat exchange (condenser-hot water and hot water-fresh air) is added, so that the heat exchange efficiency is reduced.
(2) Directly recovering the condenser for heat dissipation: the condenser of the refrigeration cycle is divided into a main condenser (radiating through cooling water or outdoor air) and a heat recovery condenser (used for reheating fresh air) through a parallel connection or series connection mode to realize direct recovery of condensation heat. At present, the mode is the most economical and efficient, however, the energy efficiency ratio of the compressor is determined by the condensation temperature of the main condenser, and in order to meet the heat dissipation requirement, the condensation temperature in summer is as high as 50 ℃ or more (the outdoor air temperature is higher than 35 ℃), so that the compression ratio is high and the energy efficiency ratio is low. In fact, the temperature of the fresh air after cooling and dehumidification is very low, so that the heat recovery condenser exchanging heat with the fresh air does not need very high condensation temperature, and the circulation efficiency is not optimized.
Disclosure of Invention
The invention aims to solve the problems and provide a single-machine two-stage compression intermediate extraction heat recovery fresh air processing device, which utilizes the principle of single-machine two-stage compression intermediate cooling to recover part of condensation heat for reheating fresh air on one hand; on the other hand, the energy efficiency ratio of the compressor can be obviously improved. The system is simple, high control precision can be guaranteed, and the problem of high energy consumption in fresh air treatment in high-humidity areas in the south and the middle of China is effectively solved.
The invention realizes the purpose through the following technical scheme: a single-machine two-stage compression middle air extraction heat recovery fresh air treatment device comprises an independent refrigeration structure and a cold and hot dual-purpose structure, and further comprises a single-machine two-stage compressor, a conventional condenser, a fan, a first liquid reservoir, a first refrigeration throttling device, an evaporator, a gas-liquid separator, a refrigerant flow control valve, a heat recovery condenser, a second liquid reservoir, a second refrigeration throttling device, a central cold and hot water surface heat exchanger, a middle-effect filter, a primary-effect filter, a high-efficiency filter, a cooling water circulating pump, a cooling tower, a four-way reversing valve, a one-way valve, a heating liquid reservoir and a heating throttling device;
when the single refrigeration structure is adopted, the high-pressure exhaust port of the single double-stage compressor is connected with a conventional condenser, the conventional condenser is connected with the inlet of a first liquid storage device, the fan is arranged on one side of the conventional condenser, the conventional condenser forms cooling water circulation with a cooling tower and a cooling water circulating pump, the outlet of the first liquid storage device is connected with the inlet of a first refrigeration throttling device, the outlet of the first refrigeration throttling device is connected with the inlet of an evaporator, the outlet of the evaporator is connected with the inlet of a gas-liquid separator, the outlet of the gas-liquid separator is connected with the suction port of the single double-stage compressor, the middle exhaust port of the single double-stage compressor is connected with the inlet of a refrigerant flow regulating valve, the outlet of the refrigerant flow regulating valve is connected with the inlet of a heat recovery condenser, the outlet of the heat recovery condenser is connected with the inlet of a second liquid storage device, the outlet of the second refrigeration throttling device is connected with the evaporator, the inlet and the outlet of the central cold and hot water surface heat exchanger are respectively connected with the supply and return water of the air-conditioning water system, and the primary filter, the intermediate filter, the central cold and hot water surface heat exchanger, the evaporator, the water baffle, the heat recovery condenser and the high-efficiency filter sequentially flow through fresh air;
when the cooling and heating dual-purpose structure is adopted, a high-pressure exhaust port of the single-machine two-stage compressor is connected with an inlet of a four-way reversing valve, the other three ports of the four-way reversing valve are respectively connected with a conventional condenser, an evaporator and a gas-liquid separator, an outlet of the conventional condenser is respectively connected with a first liquid receiver and a heating throttling device, the first liquid receiver is connected with a one-way valve, and an outlet of the one-way valve is connected with a first refrigerating throttling device; heating choke valve and check valve exit linkage, the check valve entry is connected with the heating cistern, heating cistern and first refrigeration throttling arrangement all are connected with the evaporimeter, the evaporimeter is connected with the four-way reversing valve, the middle gas vent and the refrigerant flow control valve entry linkage of unit double stage compressor, the export and the heat recovery condenser entry linkage of refrigerant flow control valve, the entry linkage of heat recovery condenser export and second cistern, the export and the second refrigeration throttling arrangement entry of second cistern link to each other, the second refrigeration throttling arrangement export links to each other with the evaporimeter, just imitate filter, well effect filter, evaporimeter, breakwater, heat recovery condenser and high efficiency filter and flow through the new trend in proper order.
As a still further scheme of the invention: the independent refrigerating structure and the cold and hot dual-purpose structure are two different structural forms, the independent refrigerating structure is preferentially adopted when a concentrated cold and heat source convenient to take is available, and the cold and hot dual-purpose structure is adopted when the concentrated cold and heat source convenient to take is unavailable.
As a still further scheme of the invention: and a temperature sensor is arranged behind the heat recovery condenser, and the opening degree of the refrigerant flow regulating valve is controlled through the temperature signal.
As a still further scheme of the invention: the refrigerant flow regulating valve is controlled to be in an open or closed state according to an outdoor temperature signal detected by a fresh air inlet or an outdoor temperature sensor.
As a still further scheme of the invention: a water baffle is arranged between the evaporator and the heat recovery condenser, a water condensation disc is arranged at the bottom of a cooling section where the evaporator and the central cold-hot water surface heat exchanger are located, and the water condensation disc is communicated with a water condensation drain pipe.
As a still further scheme of the invention: the conventional condenser can be a finned tube heat exchanger, a plate heat exchanger, a shell and tube heat exchanger and the like, when air cooling is adopted, the conventional condenser leads outdoor air, indoor exhaust air or mixed airflow of the indoor exhaust air and the outdoor air to uniformly flow through the finned tube heat exchanger by inducing air through a fan, and when water cooling is adopted, the conventional condenser, a cooling tower and a cooling water circulating pump form cooling water circulation.
As a still further scheme of the invention: the first refrigeration throttling device, the second refrigeration throttling device and the heating throttling device can adopt an electronic expansion valve, a capillary tube or a thermal expansion valve.
The invention has the beneficial effects that: the single-machine two-stage compression middle exhaust heat recovery fresh air processing device is reasonable in design, 1) a low-temperature cold source can be provided for fresh air processing, and the problem that central cold water cannot meet the low-temperature requirement of high dehumidification capacity is avoided; 2) condensation heat can be recovered to provide free heat for the reheating process of fresh air; 3) the working condition of the compressor can be improved, the compression ratio is reduced, and the input electric energy of the compressor is saved. In conclusion, the invention has the characteristics of high efficiency, energy conservation, intelligent control, optimized operation, safety, reliability, low cost and low operation cost.
Drawings
FIG. 1 is a schematic view of a single refrigeration configuration in an air cooling mode according to the present invention;
FIG. 2 is a schematic view of a single refrigeration configuration in a water cooling mode according to the present invention;
FIG. 3 is a schematic diagram of a dual-purpose structure of cold and hot water according to the present invention.
In the figure: 1. the system comprises a single-machine two-stage compressor, 2, a conventional condenser, 3, a fan, 4, a first liquid receiver, 5, a first refrigeration throttling device, 6, an evaporator, 7, a gas-liquid separator, 8, a refrigerant flow control valve, 9, a heat recovery condenser, 10, a second liquid receiver, 11, a second refrigeration throttling device, 12, a central cold-hot water surface heat exchanger, 13, a medium-effect filter, 14, a primary-effect filter, 15, a high-effect filter, 16, a cooling water circulating pump, 17, a cooling tower, 18, a four-way reversing valve, 19, a one-way valve, 20, a heating liquid receiver, 21 and a heating throttling device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 3, a single-unit two-stage compression intermediate extraction heat recovery fresh air processing device includes a single refrigeration structure and a cold-hot dual-purpose structure, and further includes a single-unit two-stage compressor 1, a conventional condenser 2, a fan 3, a first liquid receiver 4, a first refrigeration throttling device 5, an evaporator 6, a gas-liquid separator 7, a refrigerant flow control valve 8, a heat recovery condenser 9, a second liquid receiver 10, a second refrigeration throttling device 11, a central cold-hot water surface heat exchanger 12, a medium-efficiency filter 13, a primary-efficiency filter 14, a high-efficiency filter 15, a cooling water circulating pump 16, a cooling tower 17, a four-way reversing valve 18, a one-way valve 19, a heating liquid receiver 20 and a heating throttling device 21;
during the structure of refrigerating alone, the high-pressure exhaust port of the single-machine two-stage compressor 1 is connected with the conventional condenser 2, the conventional condenser 2 is connected with the inlet of the first liquid receiver 4, the fan 3 is arranged on one side of the conventional condenser 2, the cooling tower 17 and the cooling water circulating pump 16 form cooling water circulation, the outlet of the first liquid receiver 4 is connected with the inlet of the first refrigerating throttling device 5, the outlet of the first refrigerating throttling device 5 is connected with the inlet of the evaporator 6, the outlet of the evaporator 6 is connected with the inlet of the gas-liquid separator 7, the outlet of the gas-liquid separator 7 is connected with the air suction port of the single-machine two-stage compressor 1, the middle exhaust port of the single-machine two-stage compressor 1 is connected with the inlet of the refrigerant flow regulating valve 8, the outlet of the refrigerant flow regulating valve 8 is connected with the inlet of the heat recovery condenser 9, and, an outlet of the second liquid receiver 10 is connected with an inlet of a second refrigeration throttling device 11, an outlet of the second refrigeration throttling device 11 is connected with an evaporator 6, an inlet and an outlet of a central cold and hot water surface heat exchanger 12 are respectively connected with supply and return water of an air-conditioning water system, and fresh air sequentially flows through a primary filter 14, a medium-efficiency filter 13, the central cold and hot water surface heat exchanger 12, the evaporator 6, a water baffle, a heat recovery condenser 9 and a high-efficiency filter 15;
when the cold and hot dual-purpose structure is adopted, a high-pressure exhaust port of the single-machine two-stage compressor 1 is connected with an inlet of a four-way reversing valve 18, the other three ports of the four-way reversing valve 18 are respectively connected with a conventional condenser 2, an evaporator 6 and a gas-liquid separator 7, an outlet of the conventional condenser 2 is respectively connected with a first liquid receiver 4 and a heating throttling device 21, the first liquid receiver 4 is connected with a one-way valve 19, and an outlet of the one-way valve 19 is connected with a first refrigerating throttling device 5; the heating throttle valve is connected with the outlet of the one-way valve 19, the inlet of the one-way valve 19 is connected with the heating liquid storage device 20, the heating liquid storage device 20 and the first refrigerating throttling device 5 are both connected with the evaporator 6, the evaporator 6 is connected with the four-way reversing valve 18, the middle exhaust port of the single-machine two-stage compressor 1 is connected with the inlet of the refrigerant flow regulating valve 8, the outlet of the refrigerant flow regulating valve 8 is connected with the inlet of the heat recovery condenser 9, the outlet of the heat recovery condenser 9 is connected with the inlet of the second liquid storage device 10, the outlet of the second liquid storage device 10 is connected with the inlet of the second refrigerating throttling device 11, the outlet of the second refrigerating throttling device 11 is connected with the evaporator 6, and the primary filter 14, the intermediate-effect filter 13, the evaporator 6, the water baffle, the heat recovery condenser 9 and the high-efficiency;
further, in the embodiment of the present invention, the independent refrigerating structure and the dual-purpose cooling and heating structure are two different structural forms, the independent refrigerating structure is preferentially adopted when there is a centralized cooling and heating source convenient to use, and the dual-purpose cooling and heating structure is adopted when there is no centralized cooling and heating source convenient to use.
Further, in the embodiment of the present invention, a temperature sensor is provided after the heat recovery condenser 9, and the opening degree of the refrigerant flow rate adjustment valve 8 is controlled by the temperature signal.
Further, in the embodiment of the present invention, the refrigerant flow regulating valve 8 is controlled to be in an open or closed state according to an outdoor temperature signal detected by a fresh air inlet or an outdoor temperature sensor.
Further, in the embodiment of the present invention, a water baffle is disposed between the evaporator 6 and the heat recovery condenser 9, and a water condensation tray is disposed at the bottom of the cooling section where the evaporator 6 and the central cold and hot water surface heat exchanger 12 are located, and is communicated with the water condensation drain pipe.
Further, in the embodiment of the present invention, the conventional condenser 2 may be a finned tube heat exchanger, a plate heat exchanger, a shell-and-tube heat exchanger, etc., when air cooling is adopted, the conventional condenser 2 uses the fan 3 to induce air so as to make the outdoor air, indoor exhaust air or the mixed air flow of the indoor exhaust air and the outdoor air uniformly flow through the finned tube heat exchanger, and when water cooling is adopted, the conventional condenser 2, the cooling tower 17 and the cooling water circulating pump 16 form cooling water circulation.
Further, in the embodiment of the present invention, the first cooling throttling device 5, the second cooling throttling device 11, and the heating throttling device 21 may adopt an electronic expansion valve, a capillary tube, or a thermal expansion valve.
The working principle is as follows: when the single-machine two-stage compression middle-suction heat recovery fresh air processing device is used, when a single refrigeration structure runs in a summer system, high-temperature and high-pressure refrigerant discharged from a high-pressure exhaust port of a single-machine two-stage compressor 1 enters a conventional condenser 2, the refrigerant is changed into high-temperature and high-pressure liquid after being condensed and enters a first liquid storage device 4, the pressure of the refrigerant at the outlet of the first liquid storage device 4 is reduced after passing through a first refrigeration throttling device 5, and the refrigerant is subjected to heat absorption and evaporation in an evaporator 6 and is changed into low-temperature and low. The medium-temperature medium-pressure refrigerant gas discharged from the middle exhaust port of the single-unit two-stage compressor 1 flows through the refrigerant flow regulating valve 8 and enters the heat recovery condenser 9, the medium-temperature medium-pressure refrigerant gas is condensed into medium-temperature medium-pressure refrigerant liquid after heat exchange with low-temperature fresh air, the refrigerant liquid is discharged from the outlet of the heat recovery condenser 8 and enters the second liquid reservoir 10, then flows through the second refrigeration throttling device 11, is subjected to pressure reduction, and absorbs heat and evaporates in the evaporator 6 to become low-temperature low-pressure refrigerant gas. The low-temperature and low-pressure refrigerant gas finally discharged from the outlet of the evaporator 6 passes through the gas-liquid separator 7 and enters the suction port of the single-unit two-stage compressor 1. After the outdoor high-temperature high-humidity fresh air is introduced, the fresh air passes through the primary filter 14 and the intermediate filter 13, is firstly cooled with the central cold water surface heat exchanger 12 for the first time, then exchanges heat with the evaporator 6 and is cooled for the second time, and the required dehumidification quantity requirement is met. The low-temperature fresh air passes through the heat recovery condenser 8, reaches a fresh air processing state point after being heated, and is directly sent into a room through the high-efficiency filter 15 or is sent into the room after being mixed with return air. The temperature sensor arranged behind the heat recovery condenser detects the temperature of the heated fresh air, and controls the opening of the refrigerant flow regulating valve 8 according to the temperature signal, so as to realize the accurate control of the fresh air processing state.
When the system operates in winter with an independent refrigeration structure, the single-unit two-stage compressor 1 stops operating, and outdoor low-temperature fresh air is heated to a temperature state needing to be processed by the central hot water surface heat exchanger 12 after passing through the primary filter 14 and the intermediate filter 13.
When the cold and hot dual-purpose structure operates in summer, high-temperature and high-pressure refrigerant gas discharged from a high-pressure exhaust port of the single-machine two-stage compressor 1 enters the four-way reversing valve 18 and then enters the conventional condenser 2, the refrigerant is changed into high-temperature and high-pressure liquid after being condensed and enters the first liquid storage device 4, the pressure of the refrigerant at the outlet of the first liquid storage device 4 is reduced after passing through the check valve 19 and the first refrigeration throttling device 5, and the refrigerant is changed into low-temperature and low-pressure refrigerant gas through heat absorption evaporation in. The medium-temperature medium-pressure refrigerant gas discharged from the middle exhaust port of the single-unit two-stage compressor 1 flows through the refrigerant flow regulating valve 8 and enters the heat recovery condenser 9, the medium-temperature medium-pressure refrigerant gas is condensed into medium-temperature medium-pressure refrigerant liquid after heat exchange with low-temperature fresh air, the refrigerant liquid is discharged from the outlet of the heat recovery condenser 9 and enters the second liquid reservoir 10, then flows through the second refrigeration throttling device 11, is subjected to pressure reduction, and absorbs heat and evaporates in the evaporator 6 to become low-temperature low-pressure refrigerant gas. The low-temperature and low-pressure refrigerant gas discharged from the outlet of the evaporator 6 finally flows through the four-way reversing valve 18, enters the gas-liquid separator 7 and finally returns to the suction port of the single-unit two-stage compressor 1. After the outdoor high-temperature high-humidity fresh air is introduced, the fresh air is subjected to heat exchange with the evaporator 6 through the primary filter 14 and the intermediate filter 13 and is cooled, and the required dehumidification amount requirement is met. The low-temperature fresh air passes through the heat recovery condenser 9, reaches a fresh air processing state point after being heated, and is directly sent into a room through the high-efficiency filter 15 or is sent into the room after being mixed with return air. The temperature sensor arranged behind the heat recovery condenser 9 detects the temperature of the heated fresh air, and controls the opening of the refrigerant flow regulating valve 8 according to the temperature signal, so as to realize the accurate control of the fresh air processing state. The temperature sensor arranged at the fresh air inlet detects the temperature of outdoor air, and controls the refrigerant flow regulating valve 8 to be in an open state according to an outdoor temperature signal.
When the cold and hot dual-purpose structure operates in winter, high-temperature and high-pressure refrigerant gas discharged from a high-pressure exhaust port of the single-machine two-stage compressor 1 enters the four-way reversing valve 18, then enters the evaporator and is converted into the condenser 6, after heat exchange is carried out with fresh air, the high-temperature and high-pressure refrigerant gas is condensed into high-temperature and high-pressure liquid, the high-temperature and high-pressure liquid enters the heating liquid reservoir 20, the refrigerant at the outlet of the heating liquid reservoir 20 passes through the one-way valve 19 and the heating throttling device 21, the pressure of the refrigerant is reduced, the refrigerant enters the conventional condenser and is converted into the evaporator 6, the refrigerant is subjected to heat absorption and evaporation to become low-. The intermediate discharge port of the single-unit two-stage compressor 1 is not discharged with the intermediate refrigerant at this time, and the refrigerant flow rate adjustment valve 11 is in a closed state. After the low-temperature outdoor fresh air is introduced, the low-temperature outdoor fresh air passes through the primary filter 14 and the intermediate filter 13 and then is converted into the condenser 6 with the evaporator, so that the low-temperature outdoor fresh air is heated to the required treatment temperature, and finally is directly sent into the room through the high-efficiency filter 15 or is sent into the room after being mixed with return air. The temperature sensor arranged at the fresh air inlet detects the temperature of outdoor air, and controls the refrigerant flow regulating valve 8 to be in a closed state according to an outdoor temperature signal.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a heat recovery fresh air processing apparatus bleeds in middle of unit doublestage compression, includes independent refrigeration structure and cold and hot dual-purpose structure, its characterized in that: the system is characterized by also comprising a single-machine double-stage compressor (1), a conventional condenser (2), a fan (3), a first liquid receiver (4), a first refrigeration throttling device (5), an evaporator (6), a gas-liquid separator (7), a refrigerant flow control valve (8), a heat recovery condenser (9), a second liquid receiver (10), a second refrigeration throttling device (11), a central cold (hot) water surface heat exchanger (12), a medium-efficiency filter (13), a primary-efficiency filter (14), a high-efficiency filter (15), a cooling water circulating pump (16), a cooling tower (17), a four-way reversing valve (18), a one-way valve (19), a heating liquid receiver (20) and a heating throttling device (21);
during the independent refrigeration structure, the high-pressure exhaust port of the single double-stage compressor (1) is connected with the conventional condenser (2), the conventional condenser (2) is connected with the inlet of the first liquid receiver (4), the fan (3) is arranged on one side of the conventional condenser (2), the conventional condenser (2) forms cooling water circulation with the cooling tower (17) and the cooling water circulating pump (16), the outlet of the first liquid receiver (4) is connected with the inlet of the first refrigeration throttling device (5), the outlet of the first refrigeration throttling device (5) is connected with the inlet of the evaporator (6), the outlet of the evaporator (6) is connected with the inlet of the gas-liquid separator (7), the outlet of the gas-liquid separator (7) is connected with the suction port of the single double-stage compressor (1), the middle exhaust port of the single double-stage compressor (1) is connected with the inlet of the refrigerant flow regulating valve (8), an outlet of the refrigerant flow regulating valve (8) is connected with an inlet of a heat recovery condenser (9), an outlet of the heat recovery condenser (9) is connected with an inlet of a second liquid storage device (10), an outlet of the second liquid storage device (10) is connected with an inlet of a second refrigeration throttling device (11), an outlet of the second refrigeration throttling device (11) is connected with an evaporator (6), an inlet and an outlet of the central cold (hot) water surface heat exchanger (12) are respectively connected with water supply and return of an air-conditioning water system, and the primary filter (14), the intermediate filter (13), the central cold (hot) water surface heat exchanger (12), the evaporator (6), the water baffle, the heat recovery condenser (9) and the high-efficiency filter (15) sequentially flow through fresh air;
when the cold and hot dual-purpose structure is adopted, a high-pressure exhaust port of the single-machine two-stage compressor (1) is connected with an inlet of a four-way reversing valve (18), the other three ports of the four-way reversing valve (18) are respectively connected with a conventional condenser (2), an evaporator (6) and a gas-liquid separator (7), an outlet of the conventional condenser (2) is respectively connected with a first liquid receiver (4) and a heating throttling device (21), the first liquid receiver (4) is connected with a one-way valve (19), and an outlet of the one-way valve (19) is connected with a first refrigerating throttling device (5); heating throttle valve and check valve (19) exit linkage, check valve (19) entry is connected with heating cistern (20), heating cistern (20) and first refrigeration throttling arrangement (5) all are connected with evaporimeter (6), evaporimeter (6) are connected with cross reversing valve (18), the middle gas vent and refrigerant flow control valve (8) entry linkage of unit double stage compressor (1), the export and the heat recovery condenser (9) entry linkage of refrigerant flow control valve (8), the entry linkage of heat recovery condenser (9) export and second cistern (10), the export and the second of second cistern (10) refrigerate throttling arrangement (11) entry linkage, second refrigerate throttling arrangement (11) export and evaporimeter (6) link to each other, primary filter (14), medium efficiency filter (13)'s, The evaporator (6), the water baffle, the heat recovery condenser (9) and the high-efficiency filter (15) flow through fresh air in sequence.
2. The single-machine double-stage compression intermediate air exhaust heat recovery fresh air processing device according to claim 1, characterized in that: the independent refrigerating structure and the cold and hot dual-purpose structure are two different structural forms, the independent refrigerating structure is preferentially adopted when a concentrated cold and heat source convenient to take is available, and the cold and hot dual-purpose structure is adopted when the concentrated cold and heat source convenient to take is unavailable.
3. The single-machine double-stage compression intermediate air exhaust heat recovery fresh air processing device according to claim 1, characterized in that: and a temperature sensor is arranged behind the heat recovery condenser (9), and the opening degree of the refrigerant flow regulating valve (8) is controlled through the temperature signal.
4. The single-machine double-stage compression intermediate air exhaust heat recovery fresh air processing device according to claim 1, characterized in that: the refrigerant flow regulating valve (8) is controlled to be in an open or closed state according to an outdoor temperature signal detected by a fresh air inlet or an outdoor temperature sensor.
5. The single-machine double-stage compression intermediate air exhaust heat recovery fresh air processing device according to claim 1, characterized in that: a water baffle is arranged between the evaporator (6) and the heat recovery condenser (9), a water condensation disc is arranged at the bottom of a cooling section where the evaporator (6) and the central cold (hot) water surface heat exchanger (12) are located, and the water condensation disc is communicated with a water condensation drain pipe.
6. The single-machine double-stage compression intermediate air exhaust heat recovery fresh air processing device according to claim 1, characterized in that: the conventional condenser (2) can be a finned tube heat exchanger, a plate heat exchanger, a shell-and-tube heat exchanger and the like, when air cooling is adopted, the conventional condenser (2) leads the mixed airflow of outdoor air, indoor exhaust air or indoor exhaust air and outdoor air to uniformly flow through the finned tube heat exchanger by inducing air through the fan (3), and when water cooling is adopted, the conventional condenser (2), the cooling tower (17) and the cooling water circulating pump (16) form cooling water circulation.
7. The single-machine double-stage compression intermediate air exhaust heat recovery fresh air processing device according to claim 1, characterized in that: the first refrigeration throttling device (5), the second refrigeration throttling device (11) and the heating throttling device (21) can adopt an electronic expansion valve, a capillary tube or a thermal expansion valve.
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