CN103808065B - Equations of The Second Kind lithium bromide absorption type heat pump machine set system - Google Patents
Equations of The Second Kind lithium bromide absorption type heat pump machine set system Download PDFInfo
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- CN103808065B CN103808065B CN201410052588.5A CN201410052588A CN103808065B CN 103808065 B CN103808065 B CN 103808065B CN 201410052588 A CN201410052588 A CN 201410052588A CN 103808065 B CN103808065 B CN 103808065B
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- lithium bromide
- absorption type
- heat pump
- type heat
- bromide absorption
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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
- 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
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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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]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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- Sorption Type Refrigeration Machines (AREA)
Abstract
The present invention relates to a kind of Equations of The Second Kind lithium bromide absorption type heat pump machine set system, comprise two single-action Equations of The Second Kind lithium bromide absorption type heat pump units, two units are connected by pipeline, First unit and second unit include generator (1), condenser (2), evaporimeter (6), absorber (7) and solution heat exchanger (5), waste heat source series connection is driven to enter the evaporimeter (6) of First unit successively, the evaporimeter (6) of second unit, the generator (1) of second unit and the generator (1) of First unit, cooling water parallel connection enters the condenser (2) of First unit and the condenser (2) of second unit respectively, the high temperature heat source parallel connection of producing enters the absorber (7) of First unit and the absorber (7) of second unit respectively, two unit solution circulations and water as refrigerant circulation are separately independently, respectively by Equations of The Second Kind lithium bromide absorption type heat pump unit single-action process flow operation in the past.The present invention in (low) warm waste heat source drive, under using cooling water condition, the recovery of used heat heat can be increased.
Description
Technical field
The present invention relates to a kind of Equations of The Second Kind lithium bromide absorption type heat pump machine set system.Belong to air conditioner technical field.
Background technology
Warm heat sources is in a large number there is in production technology, directly emit and not only waste a large amount of thermals source, but also can thermal pollution be produced, water quench is adopted to need to consume a large amount of cooling waters, these have the place of used heat to need again a large amount of high temperature heat sources in art production process in addition, need the energy consuming a large amount of high-quality to supply.Adopt Equations of The Second Kind lithium bromide absorption type heat pump unit in such occasion, effectively can reclaim waste heat under using the condition of cooling water, produce higher temperature thermal source.Single-action Equations of The Second Kind lithium bromide absorption type heat pump unit in the past, as shown in Figure 1, it mainly contains the compositions such as the pipeline of generator 1, condenser 2, evaporimeter 6, absorber 7, heat exchanger 5, concentrated solution pump 4, cryogenic fluid pump 3, evaporimeter refrigerant cycle pump 8, control system (not shown) and connecting components, heating flow process is that waste heat source enters in evaporimeter and generator heat-transfer pipe, in generator 1, weak solution from absorber is heated refrigerant vapour, weak solution simmer down to concentrated solution by waste heat source heating generation.Concentrated solution delivers to absorber 7 by concentrated solution pump 4 through solution heat exchanger 5.Heat refrigerant vapour cooled water condensation in condenser 2 and become water as refrigerant, condensation heat is taken out of outside machine by cooling water, water as refrigerant delivers to evaporimeter water as refrigerant liquid capsule through cryogenic fluid pump 3 pressurization, then squeezes into evaporimeter 6 tube surface by evaporimeter refrigerant cycle pump 8, draws the heat of waste heat source and evaporates.Steam is absorbed by the concentrated solution in absorber 7, and concentrated solution becomes weak solution, and the absorption heat of generation adds heat absorber 7 and manages the interior high temperature heat source that will produce.The heat source temperature that single-action second-kind absorption-type heat pump unit is produced is compared with used heat heat source temperature, temperature elevating range only has about 30 DEG C, and also limit by cooling water temperature, thermal source increasing extent of temperature cannot improve further, thus make the thermal source grade produced limited, just cannot meet for the production technology of high grade with heat demand.To improve the increasing extent of temperature producing high temperature heat source, just need reduce the available waste heat source temperature difference, cause the used heat total amount of heat reclaimed to reduce, a part of used heat cannot be recycled and waste, thus causes energy resource consumption to increase.How (low) warm waste heat source in recycling as much as possible, produces out more high-grade thermal source and meets production technology or life uses, realize mixed economy and the social benefit of energy-saving and emission-reduction, become one of important topic of research at present.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, provide a kind of in (low) warm waste heat source drive, under using cooling water condition, the recovery of used heat heat can be increased, produce the Equations of The Second Kind lithium bromide absorption type heat pump machine set system of high-grade thermal source.
The present invention seeks to realize like this: a kind of Equations of The Second Kind lithium bromide absorption type heat pump machine set system, it is characterized in that described system comprises two single-action Equations of The Second Kind lithium bromide absorption type heat pump units, two single-action Equations of The Second Kind lithium bromide absorption type heat pump units are connected by pipeline, First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit and second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit include generator, condenser, evaporimeter, absorber, solution heat exchanger, concentrated solution pump, cryogenic fluid pump and evaporimeter refrigerant cycle pump, driving waste heat source is connected, be divided into three warm areas, be respectively high-temperature region, middle warm area and low-temperature space, waste heat source series connection is driven to enter the evaporimeter of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit successively, the evaporimeter of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit, the generator of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit and the generator of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit, cooling water parallel connection enters the condenser of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit and the condenser of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit respectively, the high temperature heat source parallel connection of producing enters the absorber of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit and the absorber of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit respectively, two single-action Equations of The Second Kind lithium bromide absorption type heat pump unit solution circulations and water as refrigerant circulation are separately independently, respectively by Equations of The Second Kind lithium bromide absorption type heat pump unit single-action process flow operation in the past.
Equations of The Second Kind lithium bromide absorption type heat pump machine set system of the present invention, the described evaporimeter of First single-action Equations of The Second Kind lithium bromide absorption type heat pump and the evaporimeter of absorber and second single-action Equations of The Second Kind lithium bromide absorption type heat pump and absorber are arranged in same cylindrical shell, centre dividing plate separates, the evaporimeter of First single-action Equations of The Second Kind lithium bromide absorption type heat pump and the absorber of First single-action Equations of The Second Kind lithium bromide absorption type heat pump are in a cavity, the evaporimeter of second single-action Equations of The Second Kind lithium bromide absorption type heat pump and the absorber of second single-action Equations of The Second Kind lithium bromide absorption type heat pump are in a cavity, the generator of First single-action Equations of The Second Kind lithium bromide absorption type heat pump and the generator of condenser and second single-action Equations of The Second Kind lithium bromide absorption type heat pump and condenser are arranged in same cylindrical shell, centre separates with dividing plate respectively, the generator of First single-action Equations of The Second Kind lithium bromide absorption type heat pump and the condenser of First single-action Equations of The Second Kind lithium bromide absorption type heat pump are in a cavity, and the generator of second single-action Equations of The Second Kind lithium bromide absorption type heat pump and the condenser of second single-action Equations of The Second Kind lithium bromide absorption type heat pump are in a cavity.
High-temperature region and low-temperature space are as the driving waste heat source of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit, and high-temperature region waste heat source enters evaporimeter, low-temperature space waste heat source enters generator.Middle warm area is as the driving waste heat source of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit, and the series connection of middle warm area waste heat source enters generator after being introduced into evaporimeter again.
The invention has the beneficial effects as follows:
The present invention is by above-mentioned Equations of The Second Kind lithium bromide absorption type heat pump machine set system, by waste heat source temperature subregion, make full use of the advantage of waste heat source high-temperature region, overcome the deficiency of waste heat source low-temperature space, middle warm area waste heat source is just right, make two to drive waste heat source grade Equations of The Second Kind lithium bromide absorption type heat pump unit that is different, independent operating separately to make thermal source of high grade on an equal basis, coefficient of performance in heating all reaches about 0.48.Under the same conditions, adopt this system, than general single-action Equations of The Second Kind lithium bromide absorption type heat pump unit, the high temperature heat source grade produced improves, can for use heat demand production technology of high grade, or it is identical to produce thermal source grade, driving waste heat source temperature is even lower, significantly increase the recovery of used heat heat, decrease the consumption of primary energy, achieve mixed economy and the social benefit of energy-saving and emission-reduction.
Accompanying drawing explanation
Fig. 1 is single-action Equations of The Second Kind lithium bromide absorption type heat pump unit schematic diagram in the past.
Fig. 2 is Equations of The Second Kind lithium bromide absorption type heat pump machine set system schematic diagram of the present invention.
In figure:
Generator 1
Condenser 2
Cryogenic fluid pump 3
Concentrated solution pump 4
Solution heat exchanger 5
Evaporimeter 6
Absorber 7
Evaporimeter refrigerant cycle pump 8
First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9
Second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 10.
Detailed description of the invention
As shown in Figure 2, a kind of Equations of The Second Kind lithium bromide absorption type heat pump machine set system, connected and composed by pipeline by two single-action Equations of The Second Kind lithium bromide absorption type heat pump units, First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9 and second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 10 include the pipeline etc. of generator 1, condenser 2, evaporimeter 6, absorber 7, solution heat exchanger 5, concentrated solution pump 4, cryogenic fluid pump 3, evaporimeter refrigerant cycle pump 8, control system (not shown) and connecting components.Driving waste heat source is connected, and is divided into three warm areas, is respectively high-temperature region, middle warm area, low-temperature space.Waste heat source series connection is driven to enter the generator 1 of evaporimeter 6, second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 10 of evaporimeter 6, second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 10 of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9 and the generator 1 of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9 successively.High-temperature region and low-temperature space are as the driving waste heat source of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9, and the generator 1 that high-temperature region waste heat source enters the evaporimeter 6 of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9, low-temperature space waste heat source enters First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9.Middle warm area is as the driving waste heat source of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 10, and after the series connection of middle warm area waste heat source is introduced into the evaporimeter 6 of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 10, then enter the generator of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 10.Cooling water parallel connection enters the condenser 2 of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9 and the condenser 2 of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 10 respectively.The high temperature heat source parallel connection of producing enters the absorber 7 of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9 and the absorber 7 of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 10 respectively.Two unit solution circulations and water as refrigerant circulation separately independently, respectively by Equations of The Second Kind lithium bromide absorption type heat pump unit single-action process flow operation in the past, produce out the thermal source that grade is identical.In First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9, entering First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9 evaporimeter 6 drives the temperature of waste heat source the highest, improve the evaporating pressure of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9, the corresponding raising of absorption pressure, when producing the thermal source of uniform temperature, required concentrated solution, the concentration of weak solution is corresponding lower, these just compensate for low-temperature space waste heat source and are entering First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9 generator 1, that causes because temperature is low can not concentrate relatively dense defect by solution, make First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9 in weak solution, in the corresponding lower situation of concentration of concentrated solution, the high temperature heat source with second identical grade of single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 10 can be made.In second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 10, middle warm area waste heat source (namely from First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9 evaporimeter waste heat source out) is introduced into second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 10 evaporimeter 6, temperature is low relative to First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9 evaporimeter, absorption pressure is corresponding lower than First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9, when producing the thermal source of identical grade, required concentrated solution, the concentration of weak solution is corresponding higher, but second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 10 generator 1 drives waste heat source warm area higher than First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9, under equal cooling water condition, second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit 9 generator 1 is had the ability the concentrated solution of the higher concentration of weak solution simmer down to higher for relative concentration needs.Optimized integration by above-mentioned, constitute a kind of Equations of The Second Kind lithium bromide absorption type heat pump machine set system, produce out more high-grade high temperature heat source, for the production technology using heat demand of high grade, or it is identical to produce thermal source grade, driving waste heat source temperature is even lower, significantly increases the recovery of used heat heat, decrease the consumption of primary energy, achieve mixed economy and the social benefit of energy-saving and emission-reduction.
Two Equations of The Second Kind lithium bromide absorption type heat pump units in above scheme also can be: the evaporimeter 6 of First single-action Equations of The Second Kind lithium bromide absorption type heat pump and the evaporimeter 6 of absorber 7 and second single-action Equations of The Second Kind lithium bromide absorption type heat pump and absorber 7 are arranged in same cylindrical shell, centre dividing plate separates, the evaporimeter 6 of First single-action Equations of The Second Kind lithium bromide absorption type heat pump and the absorber 7 of First single-action Equations of The Second Kind lithium bromide absorption type heat pump are in a cavity, the evaporimeter 6 of second single-action Equations of The Second Kind lithium bromide absorption type heat pump and the absorber 7 of second single-action Equations of The Second Kind lithium bromide absorption type heat pump are in a cavity, the generator 1 of First single-action Equations of The Second Kind lithium bromide absorption type heat pump and the generator 1 of condenser 2 and second single-action Equations of The Second Kind lithium bromide absorption type heat pump and condenser 2 are arranged in same cylindrical shell, centre separates with dividing plate respectively, the generator 1 of First single-action Equations of The Second Kind lithium bromide absorption type heat pump and condenser 2 are in a cavity, the generator 1 of second single-action Equations of The Second Kind lithium bromide absorption type heat pump and condenser 2 are in a cavity, make this Equations of The Second Kind lithium bromide absorption type heat pump machine set system overall appearance compacter, volume reduces, and floor space reduces.
Drive used heat can be spent hot water in above scheme, conduction oil or other media.
Claims (3)
1. an Equations of The Second Kind lithium bromide absorption type heat pump machine set system, it is characterized in that described system comprises two single-action Equations of The Second Kind lithium bromide absorption type heat pump units, two single-action Equations of The Second Kind lithium bromide absorption type heat pump units are connected by pipeline, First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit (9) and second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit (10) include generator (1), condenser (2), evaporimeter (6), absorber (7), solution heat exchanger (5), concentrated solution pump (4), cryogenic fluid pump (3) and evaporimeter refrigerant cycle pump (8), driving waste heat source is connected, be divided into three warm areas, be respectively high-temperature region, middle warm area and low-temperature space, waste heat source series connection is driven to enter the evaporimeter (6) of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit (9) successively, the evaporimeter (6) of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit (10), the generator (1) of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit (10) and the generator (1) of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit (9), cooling water parallel connection enters the condenser (2) of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit (9) and the condenser (2) of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit (10) respectively, the high temperature heat source parallel connection of producing enters the absorber (7) of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit (9) and the absorber (7) of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit (10) respectively, two single-action Equations of The Second Kind lithium bromide absorption type heat pump unit solution circulations and water as refrigerant circulation are separately independently, respectively by Equations of The Second Kind lithium bromide absorption type heat pump unit single-action process flow operation in the past.
2. a kind of Equations of The Second Kind lithium bromide absorption type heat pump machine set system according to claim 1, it is characterized in that the evaporimeter (6) of described First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit and the evaporimeter (6) of absorber (7) and second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit and absorber (7) are arranged in same cylindrical shell, centre dividing plate separates, the evaporimeter (6) of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit and the absorber (7) of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit are in a cavity, the evaporimeter (6) of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit and the absorber (7) of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit are in a cavity, generator (1) and the condenser (2) of the generator (1) of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit and condenser (2) and second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit are arranged in same cylindrical shell, centre separates with dividing plate respectively, the generator (1) of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit and the condenser (2) of First single-action Equations of The Second Kind lithium bromide absorption type heat pump unit are in a cavity, the generator (1) of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit and the condenser (2) of second single-action Equations of The Second Kind lithium bromide absorption type heat pump unit are in a cavity.
3. a kind of Equations of The Second Kind lithium bromide absorption type heat pump machine set system according to claim 1 and 2, is characterized in that described driving used heat is spent hot water or conduction oil.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061709A (en) * | 2014-07-03 | 2014-09-24 | 李建峰 | Hot-dry rock single-effect lithium bromide absorbing-type heat pump heat supply system |
| CN109443081B (en) * | 2018-12-17 | 2023-09-26 | 国电龙源节能技术有限公司 | Heat pump driven steam condensate system and cleaning method thereof |
| CN111608886B (en) * | 2020-04-09 | 2022-09-02 | 陕西秦风气体股份有限公司 | Air inlet cooling system and method for air separation air compressor |
| CN114216287B (en) * | 2021-12-24 | 2023-05-12 | 北京华源泰盟节能设备有限公司 | Method and system for controlling heat source valve of absorption heat pump based on multiple PID |
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| CN1189598A (en) * | 1998-01-08 | 1998-08-05 | 江苏双良集团公司 | Two-section or multi-section hot water lithium bromide absorbing refrigerating unit |
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| CN102052799A (en) * | 2009-10-27 | 2011-05-11 | 中国石油化工股份有限公司 | Device for producing low-temperature water by using waste heat |
| CN203704443U (en) * | 2014-02-17 | 2014-07-09 | 双良节能***股份有限公司 | Lithium bromide absorption heat transformer unit system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4035570B2 (en) * | 1997-10-16 | 2008-01-23 | 三洋電機株式会社 | Engine exhaust heat recovery unit |
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| CN1189598A (en) * | 1998-01-08 | 1998-08-05 | 江苏双良集团公司 | Two-section or multi-section hot water lithium bromide absorbing refrigerating unit |
| JP4045914B2 (en) * | 2002-09-30 | 2008-02-13 | アイシン精機株式会社 | Waste heat recovery heat pump |
| CN101619907A (en) * | 2009-07-24 | 2010-01-06 | 大连三洋制冷有限公司 | High-efficiency vapor double effect lithium bromide absorption type refrigerating unit |
| CN102052799A (en) * | 2009-10-27 | 2011-05-11 | 中国石油化工股份有限公司 | Device for producing low-temperature water by using waste heat |
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