CN111336714B - Absorption type cold and warm water unit - Google Patents

Absorption type cold and warm water unit Download PDF

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Publication number
CN111336714B
CN111336714B CN201910810923.6A CN201910810923A CN111336714B CN 111336714 B CN111336714 B CN 111336714B CN 201910810923 A CN201910810923 A CN 201910810923A CN 111336714 B CN111336714 B CN 111336714B
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China
Prior art keywords
temperature plate
heat exchanger
plate heat
hex
condenser
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CN201910810923.6A
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Chinese (zh)
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CN111336714A (en
Inventor
谷再丰
黄国华
李绍飞
常晟
秦冰
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TONGFANG ENERGY-SAVING ENGINEERING TECHNOLOGY CO LTD
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TONGFANG ENERGY-SAVING ENGINEERING TECHNOLOGY CO LTD
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Priority to CN201910810923.6A priority Critical patent/CN111336714B/en
Publication of CN111336714A publication Critical patent/CN111336714A/en
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Classifications

    • 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
    • F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
    • F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
    • F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/18—Hot-water central heating systems using heat pumps
    • 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
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • 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
    • F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/006—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the sorption type system
    • 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
    • F25B35/00—Boiler-absorbers, i.e. boilers usable for absorption or adsorption
    • 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
    • F25B39/00—Evaporators; Condensers
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • 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]
    • Y02B30/12—Hot water central heating systems using heat pumps
    • 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]
    • Y02B30/62—Absorption based systems

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Sorption Type Refrigeration Machines (AREA)

Abstract

An absorption type cold and warm water unit relates to the technical field of energy. The invention comprises an absorber, an evaporator, a condenser, a high-temperature plate heat exchanger and a low-temperature plate heat exchanger. The device is structurally characterized in that the unit consists of a solution circulation loop and a refrigerant circulation loop. The solution circulation loop comprises a high-temperature plate heat exchanger, a flash evaporation cavity of a condenser, a low-temperature plate heat exchanger and an absorber, and the refrigerant circulation loop is formed by connecting the condenser and an evaporator. Driving a heat source to enter a high-temperature plate heat exchanger to heat the lithium bromide dilute solution, and cooling the heated lithium bromide concentrated solution through a low-temperature plate heat exchanger. The unit cools water in two paths, one path passes through the absorber and the condenser, and the other path passes through the low-temperature plate heat exchanger. Compared with the prior art, the invention increases the overall heat exchange efficiency of the unit, can realize dual purposes of steam or hot water driving, reduces the initial investment and the operation cost of equipment, and widens the adaptability of the absorption type cold-warm water unit.

Description

Absorption type cold and warm water unit
Technical Field
The invention relates to the technical field of energy, in particular to an absorption type cold-warm water unit driven by steam or hot water, which can be applied to occasions with cold and heat requirements such as central heating, central cooling, waste heat recovery, solar hot water utilization, steam and condensate depth utilization and the like.
Background
In the prior art, a shell-and-tube heat exchanger is commonly adopted as a generator of an absorption type cold-warm water unit driven by steam or hot water, so that the heat exchange efficiency is low and the cost is high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an absorption type cold and warm water unit. The invention has the greatest advantages of increasing the whole heat exchange efficiency of the unit, realizing dual purposes of steam or hot water driving, reducing the initial investment and the operation cost of equipment and widening the adaptability of the absorption type cold-warm water unit.
In order to achieve the above object, the technical solution of the present invention is realized in three ways as follows: mode one:
an absorption cold-warm water unit comprises an absorber, an evaporator, a condenser, a high-temperature plate heat exchanger and a low-temperature plate heat exchanger. The device is structurally characterized in that the unit consists of a solution circulation loop and a refrigerant circulation loop. The solution circulation loop comprises a high-temperature plate heat exchanger, a flash evaporation cavity of a condenser, a low-temperature plate heat exchanger and an absorber, and the refrigerant circulation loop is formed by connecting the condenser and an evaporator. Driving a heat source to enter a high-temperature plate heat exchanger to heat the lithium bromide dilute solution, and cooling the heated lithium bromide concentrated solution through a low-temperature plate heat exchanger. The unit cools water in two paths, one path passes through the absorber and the condenser, and the other path passes through the low-temperature plate heat exchanger.
In the absorption type cold-warm water unit, the driving heat source is steam or hot water.
Mode two:
an absorption cold-warm water unit comprises an absorber, an evaporator, a condenser, a high-temperature plate heat exchanger and a low-temperature plate heat exchanger. The device is structurally characterized in that the device consists of a solution circulation loop and a refrigerant circulation loop, wherein the solution circulation loop comprises a high-temperature plate heat exchanger, a flash evaporation cavity of a condenser, a low-temperature plate heat exchanger and an absorber, and the refrigerant circulation loop consists of the condenser and an evaporator which are connected. Driving a heat source to enter a high-temperature plate heat exchanger to heat the lithium bromide dilute solution, and carrying out heat exchange on the lithium bromide solution in the low-temperature plate heat exchanger by the lithium bromide concentrated solution. The cooling water of the unit enters the condenser through the absorber.
In the absorption type cold-warm water unit, the driving heat source is steam or hot water.
Mode three:
an absorption type cold-warm water unit comprises a basic unit consisting of an absorber, an evaporator, a condenser, a high-temperature plate heat exchanger and a low-temperature plate heat exchanger. The structure is characterized in that the unit consists of n basic units. Each basic unit is composed of a solution circulation loop and a refrigerant circulation loop, wherein the solution circulation loop comprises a high-temperature plate heat exchanger, a flash evaporation cavity of a condenser, a low-temperature plate heat exchanger and an absorber, and the refrigerant circulation loop is composed of the condenser and an evaporator which are connected. Driving heat sources to enter the n high-temperature plate heat exchangers respectively to heat lithium bromide dilute solutions with different concentrations, and cooling the heated lithium bromide concentrated solutions through the n low-temperature plate heat exchangers respectively. One path of cooling water of the unit passes through n absorbers and n condensers respectively, and the other path passes through n low-temperature plate heat exchangers.
In the absorption type cold-warm water unit, the driving heat source is steam or hot water.
In the absorption type cold and warm water unit, n is more than or equal to 2 and less than or equal to 20, and the quantity of heat exchange components in each basic unit is identical or different.
Due to the adoption of the structure, the invention provides a solution that the absorption type cold-warm water unit can realize free switching under the driving of steam or hot water, and can improve the heat exchange efficiency of the unit and reduce the unit cost. The interior of the inventive unit comprises two different pressures, an evaporation pressure and a condensation pressure. In the invention, the driving steam or hot water directly releases heat to the dilute solution through the high-temperature plate heat exchanger, thereby realizing the high-efficiency conversion of the driving heat. Because the high-temperature plate heat exchanger replaces the shell-and-tube generator and the accessory equipment thereof used in the prior art, the shell-and-tube generator and the thermal stress problem existing in the shell-and-tube generator are eliminated, the unit cost can be reduced, and the service life of the unit can be greatly prolonged.
The invention is further described below with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a third embodiment of the present invention.
Detailed Description
Example 1
Referring to fig. 1, an absorption type cold and warm water unit of the present invention includes an absorber a, an evaporator E, a condenser C, a high temperature plate heat exchanger HEX-H and a low temperature plate heat exchanger HEX-L. The unit is composed of a solution circulation loop and a refrigerant circulation loop, wherein the solution circulation loop comprises a high-temperature plate heat exchanger HEX-H, a flash evaporation cavity of a condenser C, a low-temperature plate heat exchanger HEX-L and an absorber A, and the refrigerant circulation loop is composed of the condenser C and an evaporator E which are connected. Driving a heat source to enter a high-temperature plate heat exchanger HEX-H to heat the lithium bromide dilute solution, and cooling the heated lithium bromide concentrated solution through a low-temperature plate heat exchanger HEX-L. And cooling water in the unit by two paths, wherein one path passes through the absorber A and the condenser C, and the other path passes through the low-temperature plate heat exchanger HEX-L.
Example two
Referring to fig. 2, the absorption type cold and warm water unit of the invention comprises an absorber A, an evaporator E, a condenser C, a high-temperature plate heat exchanger HEX-H and a low-temperature plate heat exchanger HEX-L. The unit is composed of a solution circulation loop and a refrigerant circulation loop, wherein the solution circulation loop comprises a high-temperature plate heat exchanger HEX-H, a flash evaporation cavity of a condenser C, a low-temperature plate heat exchanger HEX-L and an absorber A, and the refrigerant circulation loop is composed of the condenser C and an evaporator E which are connected. Driving a heat source to enter the high-temperature plate heat exchanger HEX-H to heat the lithium bromide dilute solution, and carrying out heat exchange on the lithium bromide solution in the low-temperature plate heat exchanger HEX-L by the lithium bromide concentrated solution. The unit cooling water enters the condenser C through the absorber A.
Example III
Referring to fig. 3, the absorption type cold and warm water unit of the invention comprises a basic unit consisting of an absorber A, an evaporator E, a condenser C, a high-temperature plate heat exchanger HEX-H and a low-temperature plate heat exchanger HEX-L. The unit consists of n basic units, n is more than or equal to 2 and less than or equal to 20, and each basic unit consists of a solution circulation loop and a refrigerant circulation loop. The solution circulation loop comprises a high-temperature plate heat exchanger HEX-H, a flash evaporation cavity of a condenser C, a low-temperature plate heat exchanger HEX-L and an absorber A, and the refrigerant circulation loop is formed by connecting the condenser C and an evaporator E. Driving a heat source to enter n high-temperature plate heat exchangers HEX-H respectively to heat lithium bromide dilute solutions with different concentrations, and cooling the heated lithium bromide concentrated solutions through the n low-temperature plate heat exchangers HEX-L respectively. One path of cooling water of the unit passes through n absorbers A and n condensers C respectively, and the other path of cooling water passes through n low-temperature plate heat exchangers HEX-L. The number of heat exchange components in each basic unit is consistent or different.
In the invention, the driving heat source uses steam or hot water, and the temperature range is 65-200 ℃.

Claims (7)

1. An absorption cold and warm water unit comprises an absorber (A), an evaporator (E), a condenser (C), a high-temperature plate heat exchanger (HEX-H) and a low-temperature plate heat exchanger (HEX-L); the device is characterized in that the unit consists of a solution circulation loop and a refrigerant circulation loop, wherein the solution circulation loop comprises a high-temperature plate heat exchanger (HEX-H), a flash evaporation cavity of a condenser (C), a low-temperature plate heat exchanger (HEX-L) and an absorber (A), and the refrigerant circulation loop consists of the condenser (C) and an evaporator (E) which are connected; driving a heat source to enter a high-temperature plate heat exchanger (HEX-H) to heat the lithium bromide dilute solution, and cooling the heated lithium bromide concentrated solution through a low-temperature plate heat exchanger (HEX-L); and cooling water of the unit is divided into two paths, wherein one path passes through the absorber (A) and the condenser (C), and the other path passes through the low-temperature plate heat exchanger (HEX-L).
2. An absorption chiller-heater unit according to claim 1 wherein the driving heat source is steam or hot water.
3. An absorption cold and warm water unit comprises an absorber (A), an evaporator (E), a condenser (C), a high-temperature plate heat exchanger (HEX-H) and a low-temperature plate heat exchanger (HEX-L); the device is characterized in that the unit consists of a solution circulation loop and a refrigerant circulation loop, wherein the solution circulation loop comprises a high-temperature plate heat exchanger (HEX-H), a flash evaporation cavity of a condenser (C), a low-temperature plate heat exchanger (HEX-L) and an absorber (A), and the refrigerant circulation loop consists of the condenser (C) and an evaporator (E) which are connected; driving a heat source to enter a high-temperature plate heat exchanger (HEX-H) to heat a lithium bromide dilute solution, and carrying out heat exchange on the lithium bromide solution in the low-temperature plate heat exchanger (HEX-L) by the lithium bromide concentrated solution; the cooling water of the unit enters the condenser (C) through the absorber (A).
4. An absorption chiller-heater unit according to claim 3 wherein the driving heat source is steam or hot water.
5. An absorption type cold and warm water unit comprises a basic unit consisting of an absorber (A), an evaporator (E), a condenser (C), a high-temperature plate heat exchanger (HEX-H) and a low-temperature plate heat exchanger (HEX-L); the device is characterized in that the unit consists of n basic units, each basic unit consists of a solution circulation loop and a refrigerant circulation loop, the solution circulation loop comprises a high-temperature plate heat exchanger (HEX-H), a flash evaporation cavity of a condenser (C), a low-temperature plate heat exchanger (HEX-L) and an absorber (A), and the refrigerant circulation loop consists of the condenser (C) and an evaporator (E) which are connected; driving a heat source to enter n high-temperature plate heat exchangers (HEX-H) to heat lithium bromide dilute solutions with different concentrations, and cooling the heated lithium bromide concentrated solution through the n low-temperature plate heat exchangers (HEX-L); the unit cools water in two paths, one path passes through n absorbers (A) and n condensers (C), and the other path passes through n low-temperature plate heat exchangers (HEX-L).
6. The absorption chiller-heater unit of claim 5, wherein the driving heat source is steam or hot water.
7. Absorption chiller-heater unit according to claim 5 or 6, wherein n satisfies: n is more than or equal to 2 and less than or equal to 20, and the quantity of heat exchange components in each basic unit is identical or different.
CN201910810923.6A 2019-08-30 2019-08-30 Absorption type cold and warm water unit Active CN111336714B (en)

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CN111336714B true CN111336714B (en) 2024-04-12

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111912139A (en) * 2020-07-21 2020-11-10 同方节能工程技术有限公司 Plate-type heating absorption heat pump unit

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11344268A (en) * 1998-06-01 1999-12-14 Daikin Ind Ltd Absorption refrigeration equipment
JP2001099515A (en) * 1999-09-29 2001-04-13 Hitachi Building Systems Co Ltd Method for switching between cooling and heating modes in absorption chiller / heater and apparatus therefor
JP2003106695A (en) * 2001-09-26 2003-04-09 Daikin Ind Ltd Absorption refrigeration equipment
JP2005061652A (en) * 2003-08-20 2005-03-10 Hitachi Ltd Absorption refrigerating machine
CN101825369A (en) * 2010-04-02 2010-09-08 清华大学 High-efficiency compact high-temperature absorption type heat pump unit
CN101881526A (en) * 2010-04-28 2010-11-10 大连三洋制冷有限公司 Lithium bromide single and double effect absorption type cold and warm water simultaneous heat pump hot water unit
CN203704434U (en) * 2014-02-17 2014-07-09 双良节能系统股份有限公司 Two-stage lithium bromide absorption heat transformer unit with refrigerant water preheater
CN203731736U (en) * 2014-03-01 2014-07-23 双良节能系统股份有限公司 Double-effect lithium bromide absorption heat transformer with function of coolant water heat recovery
CN105423594A (en) * 2015-12-25 2016-03-23 双良节能系统股份有限公司 Heating normal-temperature smoke discharge smoke hot water type lithium bromide absorbing type cold and hot water unit
CN105605823A (en) * 2016-02-26 2016-05-25 中国人民解放军总后勤部建筑工程研究所 Double-effect waste heat complementary combustion type lithium bromide absorption refrigerator
CN106288497A (en) * 2016-10-17 2017-01-04 四川捷元科技有限公司 Absorption refrigeration unit internal heat assembly, absorption refrigeration unit and matrix
CN106440476A (en) * 2016-11-19 2017-02-22 双良节能系统股份有限公司 Two-stage independent cascade double-effect lithium bromide absorption type refrigerating heat pump unit
CN206113423U (en) * 2016-06-28 2017-04-19 北京联力源科技有限公司 Absorption heat pump and evaporimeter thereof
CN210861792U (en) * 2019-08-30 2020-06-26 同方节能工程技术有限公司 Absorption cold and warm water machine set

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11344268A (en) * 1998-06-01 1999-12-14 Daikin Ind Ltd Absorption refrigeration equipment
JP2001099515A (en) * 1999-09-29 2001-04-13 Hitachi Building Systems Co Ltd Method for switching between cooling and heating modes in absorption chiller / heater and apparatus therefor
JP2003106695A (en) * 2001-09-26 2003-04-09 Daikin Ind Ltd Absorption refrigeration equipment
JP2005061652A (en) * 2003-08-20 2005-03-10 Hitachi Ltd Absorption refrigerating machine
CN101825369A (en) * 2010-04-02 2010-09-08 清华大学 High-efficiency compact high-temperature absorption type heat pump unit
CN101881526A (en) * 2010-04-28 2010-11-10 大连三洋制冷有限公司 Lithium bromide single and double effect absorption type cold and warm water simultaneous heat pump hot water unit
CN203704434U (en) * 2014-02-17 2014-07-09 双良节能系统股份有限公司 Two-stage lithium bromide absorption heat transformer unit with refrigerant water preheater
CN203731736U (en) * 2014-03-01 2014-07-23 双良节能系统股份有限公司 Double-effect lithium bromide absorption heat transformer with function of coolant water heat recovery
CN105423594A (en) * 2015-12-25 2016-03-23 双良节能系统股份有限公司 Heating normal-temperature smoke discharge smoke hot water type lithium bromide absorbing type cold and hot water unit
CN105605823A (en) * 2016-02-26 2016-05-25 中国人民解放军总后勤部建筑工程研究所 Double-effect waste heat complementary combustion type lithium bromide absorption refrigerator
CN206113423U (en) * 2016-06-28 2017-04-19 北京联力源科技有限公司 Absorption heat pump and evaporimeter thereof
CN106288497A (en) * 2016-10-17 2017-01-04 四川捷元科技有限公司 Absorption refrigeration unit internal heat assembly, absorption refrigeration unit and matrix
CN106440476A (en) * 2016-11-19 2017-02-22 双良节能系统股份有限公司 Two-stage independent cascade double-effect lithium bromide absorption type refrigerating heat pump unit
CN210861792U (en) * 2019-08-30 2020-06-26 同方节能工程技术有限公司 Absorption cold and warm water machine set

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