CN113654112A - Multi-mode switching secondary air conditioning system and operation method - Google Patents
Multi-mode switching secondary air conditioning system and operation method Download PDFInfo
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- CN113654112A CN113654112A CN202110895619.3A CN202110895619A CN113654112A CN 113654112 A CN113654112 A CN 113654112A CN 202110895619 A CN202110895619 A CN 202110895619A CN 113654112 A CN113654112 A CN 113654112A
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- evaporator
- heat pipe
- composite integrated
- condenser
- heat
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
- F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0071—Indoor units, e.g. fan coil units with means for purifying supplied air
- F24F1/0073—Indoor units, e.g. fan coil units with means for purifying supplied air characterised by the mounting or arrangement of filters
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- 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
- F24F13/30—Arrangement or mounting of heat-exchangers
Abstract
The invention relates to a multi-mode switching two-stage air conditioning system and an operation method thereof, and the multi-mode switching two-stage air conditioning system comprises an outdoor unit and an indoor unit, wherein the outdoor unit and the indoor unit are connected through a pipeline to form a two-stage loop, the outdoor unit comprises a composite integrated condenser, a heat pipe condenser and a filter, an external fan is arranged on one side of the composite integrated condenser, the indoor unit comprises a composite integrated evaporator, a heat pipe evaporator and a compressor, an internal fan is arranged on one side of the composite integrated evaporator, the composite integrated condenser is sequentially connected with the filter, the composite integrated evaporator and the compressor through pipelines to form a loop, and the heat pipe condenser is connected with the heat pipe evaporator through a pipeline to form a loop. According to the invention, a secondary refrigeration loop is constructed, so that higher hot air can generate low enough air through the two-stage heat exchangers, and the cooling requirement of a machine room is met; the heat exchanger has uniform internal temperature difference, reduces temperature difference loss, improves heat exchange efficiency and improves heat exchange efficiency of a heat pipe system.
Description
Technical Field
The invention relates to a multi-mode switching two-stage air conditioning system and an operation method thereof, belonging to the technical field of machine room heat dissipation and heat pipes.
Background
At present, the IDC machine room adopts new technologies to improve the energy efficiency ratio of refrigeration and hot standby, and the new technologies comprise a fresh air type energy-saving system, a heat exchange system, a heat pipe exchanger for energy saving and the like. Among them, the heat pipe technology has been developed and used in the industries of spacecraft, electronic equipment, waste heat recovery, etc., and the air conditioning industry of the machine room mainly uses gravity separation type heat pipes (hereinafter referred to as "heat pipes"). The heat pipe heat exchanger has a simple structure and has no power part, the latent heat generated by the box transformer of the refrigerant in the heat exchanger is mainly used for exchanging heat, the heat transfer efficiency is very high, and the energy-saving effect is obvious.
The integrated density of rack server is higher and higher in the computer lab, and the calorific capacity of server is bigger and bigger, and in order to guarantee that server work is under optimum ambient temperature in the high heat density computer lab, high heat density computer lab heat transfer mode is constantly developing the change at present also.
The heat exchange system of the cold/hot channel closed machine room greatly improves the return air temperature of the air conditioning unit and the energy efficiency of the unit; compared with a room-level air conditioner, the air supply transmission distance is short, a high static pressure fan with high power consumption is not required, and the energy consumption is reduced; and the air conditioner is close to a heat source for refrigeration, so that the problem of local hot spots in a machine room is solved to a certain extent. Based on the above advantages, the heat exchange system of the cold/hot channel closed machine room is gaining market acceptance.
The heat exchange system of the cold/hot channel closed machine room adopts a direct evaporation type and a chilled water type, but adopts single-stage refrigeration, so that the temperature difference of the returned air is small, the lower air supply temperature is not easy to realize, and the return air with higher temperature of the cold/hot channel closed machine room cannot be fully utilized.
Disclosure of Invention
In order to solve the technical problems, the invention provides a multi-mode switching two-stage air conditioning system and an operation method thereof, and the specific technical scheme is as follows:
a multi-mode switching two-stage air conditioning system comprises an outdoor unit and an indoor unit, wherein the outdoor unit and the indoor unit are connected through a pipeline to form a two-stage loop, the outdoor unit comprises a composite integrated condenser, a heat pipe condenser and a filter, an outer fan is arranged on one side of the composite integrated condenser, the indoor unit comprises a composite integrated evaporator, a heat pipe evaporator and a compressor, an inner fan is arranged on one side of the composite integrated evaporator,
the composite integrated condenser is sequentially connected with the filter, the composite integrated evaporator and the compressor through pipelines to form a loop, and the heat pipe condenser is connected with the heat pipe evaporator through pipelines to form a loop.
Further, be connected with the expansion valve between filter and the compound integral type evaporimeter, expansion valve both sides parallel connection has first solenoid valve, connect the second solenoid valve between compound integral type evaporimeter and the compressor, be connected with the first check valve that switches on towards compound integral type condenser between compressor and the compound integral type condenser, the second solenoid valve is close to compound integral type evaporimeter one side and is close to compound integral type condenser one side parallel connection with first check valve and has the second check valve that third solenoid valve and the compound integral type condenser of orientation switched on.
Furthermore, the heat pipe evaporator is formed by one or a combination of two of copper pipe aluminum fins or a micro-channel radiator.
Furthermore, the composite integrated evaporator is formed by combining one or two of copper pipe aluminum fins or a micro-channel radiator.
A multi-mode switching two-stage air conditioning system operation method comprises the following steps:
step 1: the first-stage heat exchange is carried out, an inner fan of the indoor unit is started, so that high-temperature hot air in the machine room flows through the heat pipe evaporator, and the high-temperature hot air and a low-temperature refrigerant in the heat pipe evaporator are subjected to heat exchange and converted into low-temperature cold air;
step 2: secondary heat exchange, namely, cold air with lower temperature passes through the composite integrated evaporator to exchange heat with a low-temperature refrigerant in the composite integrated evaporator to form cold air with lower temperature, and the cold air enters the machine room, so that the machine room is cooled;
and step 3: the refrigerant conversion, the low-temperature liquid refrigerant provided by the heat pipe condenser of the outdoor unit enters the indoor unit along the transmission pipeline under the action of gravity, and then passes through the heat pipe evaporator, the low-temperature liquid refrigerant becomes gaseous refrigerant after heat exchange, the gaseous refrigerant rises under the action of density difference, and the gaseous refrigerant enters the outdoor unit through the transmission pipeline;
and 4, step 4: mode switching
4.1 when the mechanical refrigeration state is switched, the compressor sucks in gaseous refrigerant from the composite integrated evaporator, the gaseous refrigerant is compressed by the compressor and discharged into the composite integrated condenser for heat exchange and condensation to form liquid refrigerant, the liquid refrigerant flows into the composite integrated evaporator through the expansion valve for heat absorption and evaporation, and the mechanical refrigeration of the compressor is rotated again, and the operation is repeated;
4.2 when the heat pipe refrigeration state is switched, the low-temperature liquid refrigerant provided by the heat pipe condenser of the outdoor unit enters the indoor unit along the transmission pipeline under the action of gravity, then passes through the heat pipe evaporator, becomes gaseous refrigerant after heat exchange, rises under the action of density difference, and enters the outdoor unit through the transmission pipeline, thus the reciprocating circulation is realized.
Further, the horizontal height of the outdoor unit is higher than that of the indoor unit.
The invention has the beneficial effects that:
according to the invention, a secondary refrigeration loop is constructed, so that higher hot air can generate low enough air through the two-stage heat exchangers, and the cooling requirement of a machine room is met; the heat exchanger has uniform internal temperature difference, reduces temperature difference loss, improves heat exchange efficiency and improves heat exchange efficiency of a heat pipe system.
Drawings
Figure 1 is a schematic view of the overall structure of the present invention,
figure 2 is a flow chart of the method of operation of the present invention,
in the figure: the system comprises an external fan 1, a compound integrated condenser 2, a heat pipe condenser 3, a filter 4, an expansion valve 5, a first electromagnetic valve 6, a heat pipe evaporator 7, an internal fan 8, a compound integrated evaporator 9, a third electromagnetic valve 10, a second electromagnetic valve 11, a compressor 12, a first one-way valve 13 and a second one-way valve 14.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1, a multi-mode switching two-stage air conditioning system includes an outdoor unit and an indoor unit, which are connected by a pipe to form a two-stage loop. The outdoor unit comprises a composite integrated condenser 2, a heat pipe condenser 3 and a filter 4. An outer fan 1 is arranged on one side of the composite integrated condenser 2. The indoor unit comprises a composite integrated evaporator 9, a heat pipe evaporator 7 and a compressor 12, wherein an inner fan 8 is arranged on one side of the composite integrated evaporator 9. The composite integrated condenser 2 is sequentially connected with the filter 4, the composite integrated evaporator 9 and the compressor 12 through pipelines to form a loop, and the heat pipe condenser 3 is connected with the heat pipe evaporator 7 through pipelines to form a loop. An expansion valve 5 is connected between the filter 4 and the composite integrated evaporator 9, and a first electromagnetic valve 6 is connected in parallel on two sides of the expansion valve 5. A second electromagnetic valve 11 is connected between the composite integrated evaporator 9 and the compressor 12, and a first check valve 13 which is conducted toward the composite integrated condenser 2 is connected between the compressor 12 and the composite integrated condenser 2. The side of the second electromagnetic valve 11 close to the composite integrated evaporator 9 and the side of the first check valve 13 close to the composite integrated condenser 2 are connected in parallel with a third electromagnetic valve 10 and a second check valve 14 which is communicated towards the composite integrated condenser 2. The multi-mode switching secondary air-conditioning heat system can be divided into four operating states. The first is the secondary cooling operation of the heat pipe and the heat pipe; the second is the secondary cooling operation of heat pipe and mechanical refrigeration; the third is single heat pipe operation; and the fourth is single mechanical refrigeration operation. The four operation states can be automatically switched to operate, so that the energy-saving effect is achieved.
As shown in fig. 2, the operation process of a multi-mode switching two-stage air conditioning heating system is as follows: under the power action of the fan 8 in the indoor unit, the hot air in the machine room firstly passes through the heat pipe evaporator 7, and the low-temperature refrigerant in the heat pipe evaporator 7 exchanges heat to become cold air with lower temperature. The cold air with lower temperature passes through the composite integrated evaporator 9 to exchange heat with the low-temperature refrigerant in the composite integrated evaporator 9, so that the cold air with lower temperature is formed. Cold air enters the machine room, so that the machine room is cooled. The structure types of the heat pipe evaporator 7 and the composite integrated evaporator 9 include, but are not limited to, copper pipe aluminum fins, micro-channel radiators and the like. The outdoor unit must be installed at a level higher than that of the indoor unit so that the liquid refrigerant can be introduced into the machine room along the transfer pipe by gravity. The low-temperature liquid refrigerant provided by the heat pipe condenser 3 of the outdoor unit enters the indoor unit along the transmission pipeline under the action of gravity, then passes through the heat pipe evaporator 7, becomes gaseous refrigerant after heat exchange, rises under the action of density difference, and enters the outdoor unit through the transmission pipeline. A system loop with switchable heat pipes and a compressor 12 is formed by the compressor 12, the first check valve 13, the second check valve 14, the first electromagnetic valve 6, the second electromagnetic valve 11, the composite integrated condenser 2, the expansion valve 5 and the composite integrated evaporator 9 in the outdoor unit. When the mechanical refrigeration state is switched, the compressor 12 sucks gaseous refrigerant from the composite integrated evaporator 9, the gaseous refrigerant is compressed by the compressor 12 and is discharged into the composite integrated condenser 2 for heat exchange and condensation to form liquid refrigerant, and the liquid refrigerant flows into the composite integrated evaporator 9 through the expansion valve 5 to absorb heat and evaporate and then returns to the mechanical refrigeration cycle process of the compressor 12. When the outdoor unit is switched to the heat pipe refrigeration state, the low-temperature liquid refrigerant provided by the heat pipe condenser 3 of the outdoor unit enters the indoor unit along the transmission pipeline under the action of gravity, passes through the heat pipe evaporator 7 again, becomes a gaseous refrigerant after heat exchange, rises under the action of density difference, and enters the circulation process of the outdoor unit through the transmission pipeline.
According to the multi-mode switching two-stage air conditioning heat system, high-temperature hot air in a machine room can generate air with lower temperature through two-stage heat exchange with the heat pipe evaporator 7 and the composite integrated evaporator 9. According to the invention, a secondary refrigeration loop is constructed, so that higher hot air can generate low enough air through the two-stage heat exchangers, and the cooling requirement of a machine room is met; the heat exchanger has uniform internal temperature difference, reduces temperature difference loss, improves heat exchange efficiency and improves heat exchange efficiency of a heat pipe system.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. A multi-mode switching two-stage air conditioning system is characterized in that: the outdoor unit and the indoor unit are connected through a pipeline to form a secondary loop, the outdoor unit comprises a composite integrated condenser (2), a heat pipe condenser (3) and a filter (4), an outer fan (1) is arranged on one side of the composite integrated condenser (2), the indoor unit comprises a composite integrated evaporator (9), a heat pipe evaporator (7) and a compressor (12), an inner fan (8) is arranged on one side of the composite integrated evaporator (9),
the composite integrated condenser (2) is sequentially connected with the filter (4), the composite integrated evaporator (9) and the compressor (12) through pipelines to form a loop, and the heat pipe condenser (3) is connected with the heat pipe evaporator (7) through pipelines to form a loop.
2. The multi-mode switching two-stage air conditioning system according to claim 1, wherein: be connected with expansion valve (5) between filter (4) and compound integral type evaporimeter (9), expansion valve (5) both sides parallel connection has first solenoid valve (6), connect second solenoid valve (11) between compound integral type evaporimeter (9) and compressor (12), be connected with between compressor (12) and compound integral type condenser (2) first check valve (13) that switch on towards compound integral type condenser (2), second solenoid valve (11) are close to compound integral type evaporimeter (9) one side and first check valve (13) and are close to second check valve (14) that compound integral type condenser (2) one side parallel connection has third solenoid valve (10) and switches on towards compound integral type condenser (2).
3. The multi-mode switching two-stage air conditioning system according to claim 1, wherein: the heat pipe evaporator (7) is formed by one or two of copper pipe aluminum fins or a micro-channel radiator.
4. The multi-mode switching two-stage air conditioning system according to claim 1, wherein: the composite integrated evaporator (9) is formed by combining one or two of copper pipe aluminum fins or a micro-channel radiator.
5. A multi-mode switching two-stage air conditioning system operation method is characterized in that: the method comprises the following steps:
step 1: primary heat exchange, starting an inner fan (8) of the indoor unit to enable high-temperature hot air in the machine room to flow through the heat pipe evaporator (7), and performing heat exchange between the high-temperature hot air and a low-temperature refrigerant in the heat pipe evaporator (7) to convert the high-temperature hot air into low-temperature cold air;
step 2: secondary heat exchange, namely, cold air with lower temperature passes through the composite integrated evaporator (9) to exchange heat with a low-temperature refrigerant in the composite integrated evaporator (9) to form cold air with lower temperature, and the cold air enters the machine room, so that the machine room is cooled;
and step 3: the refrigerant conversion, the low-temperature liquid refrigerant that the heat pipe condenser (3) of the outdoor unit provides is under the action of gravity, enter the indoor unit along the transmission line, pass the heat pipe evaporator (7) again, become the gaseous refrigerant after the heat exchange, the gaseous refrigerant rises under the action of the density difference, enter the outdoor unit through the transmission line;
and 4, step 4: mode switching
4.1 when the mechanical refrigeration state is switched, the compressor (12) sucks gaseous refrigerant from the composite integrated evaporator (9), the gaseous refrigerant is compressed by the compressor (12) and discharged into the composite integrated condenser (2) for heat exchange and condensation to form liquid refrigerant, the liquid refrigerant flows into the composite integrated evaporator (9) through the expansion valve (5) for heat absorption and evaporation, and the mechanical refrigeration of the compressor (12) is carried out again, and the cycle is repeated in the way;
4.2 when the outdoor unit is switched to the heat pipe refrigeration state, the low-temperature liquid refrigerant provided by the heat pipe condenser (3) of the outdoor unit enters the indoor unit along the transmission pipeline under the action of gravity, passes through the heat pipe evaporator (7) again, becomes a gaseous refrigerant after heat exchange, rises under the action of density difference, enters the outdoor unit through the transmission pipeline, and circulates in a reciprocating manner.
6. The multi-mode switching two-stage air conditioning system operating method according to claim 5, wherein: the horizontal height of the outdoor unit is higher than that of the indoor unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110895619.3A CN113654112A (en) | 2021-08-05 | 2021-08-05 | Multi-mode switching secondary air conditioning system and operation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110895619.3A CN113654112A (en) | 2021-08-05 | 2021-08-05 | Multi-mode switching secondary air conditioning system and operation method |
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| CN113654112A true CN113654112A (en) | 2021-11-16 |
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| CN202110895619.3A Pending CN113654112A (en) | 2021-08-05 | 2021-08-05 | Multi-mode switching secondary air conditioning system and operation method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4843832A (en) * | 1987-03-12 | 1989-07-04 | Takenaka Komuten Co., Ltd. | Air conditioning system for buildings |
| CN102853501A (en) * | 2012-08-23 | 2013-01-02 | 华为技术有限公司 | Communication base station and temperature control method thereof |
| CN202938440U (en) * | 2012-12-05 | 2013-05-15 | 北京纳源丰科技发展有限公司 | Gravity assisted heat pipe and steam compression composite refrigerating air conditioner in machine room |
| CN103423823A (en) * | 2013-06-25 | 2013-12-04 | 上海理工大学 | Compound base station room air conditioner |
| CN205860310U (en) * | 2016-07-28 | 2017-01-04 | 湖北兴致天下信息技术有限公司 | A kind of double loop machine room refrigeration heat pipe air conditioner |
| CN106403116A (en) * | 2016-11-25 | 2017-02-15 | 中国科学院理化技术研究所 | Integrated natural cooling machine room air conditioner system |
| US20190316803A1 (en) * | 2018-04-13 | 2019-10-17 | Mitek Holdings, Inc. | Heat exchanger |
| CN211781522U (en) * | 2019-09-19 | 2020-10-27 | 深圳市亿凌捷科技有限公司 | Integrated refrigeration heat pipe air conditioning system |
-
2021
- 2021-08-05 CN CN202110895619.3A patent/CN113654112A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4843832A (en) * | 1987-03-12 | 1989-07-04 | Takenaka Komuten Co., Ltd. | Air conditioning system for buildings |
| CN102853501A (en) * | 2012-08-23 | 2013-01-02 | 华为技术有限公司 | Communication base station and temperature control method thereof |
| CN202938440U (en) * | 2012-12-05 | 2013-05-15 | 北京纳源丰科技发展有限公司 | Gravity assisted heat pipe and steam compression composite refrigerating air conditioner in machine room |
| CN103423823A (en) * | 2013-06-25 | 2013-12-04 | 上海理工大学 | Compound base station room air conditioner |
| CN205860310U (en) * | 2016-07-28 | 2017-01-04 | 湖北兴致天下信息技术有限公司 | A kind of double loop machine room refrigeration heat pipe air conditioner |
| CN106403116A (en) * | 2016-11-25 | 2017-02-15 | 中国科学院理化技术研究所 | Integrated natural cooling machine room air conditioner system |
| US20190316803A1 (en) * | 2018-04-13 | 2019-10-17 | Mitek Holdings, Inc. | Heat exchanger |
| CN211781522U (en) * | 2019-09-19 | 2020-10-27 | 深圳市亿凌捷科技有限公司 | Integrated refrigeration heat pipe air conditioning system |
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Application publication date: 20211116 |