CN102607091A - Combination method of waste heat of low-temperature industrial circulating cooling water and regional centralized heat supply - Google Patents
Combination method of waste heat of low-temperature industrial circulating cooling water and regional centralized heat supply Download PDFInfo
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- CN102607091A CN102607091A CN2012101015363A CN201210101536A CN102607091A CN 102607091 A CN102607091 A CN 102607091A CN 2012101015363 A CN2012101015363 A CN 2012101015363A CN 201210101536 A CN201210101536 A CN 201210101536A CN 102607091 A CN102607091 A CN 102607091A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002918 waste heat Substances 0.000 title claims abstract description 13
- 239000000498 cooling water Substances 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 121
- 238000010438 heat treatment Methods 0.000 claims abstract description 71
- 239000007789 gas Substances 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims description 14
- 230000005855 radiation Effects 0.000 claims description 13
- 238000010792 warming Methods 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000005265 energy consumption Methods 0.000 description 11
- 239000003245 coal Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 239000008400 supply water Substances 0.000 description 4
- 230000008676 import Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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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
- 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
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Abstract
The invention discloses a combination method of waste heat of low-temperature industrial circulating cooling water and regional heat supply, which includes the following steps: (1) feeding the low-temperature industrial circulating cooling water to an evaporator of a water source heat pump unit through a circulating pump; and (2) feeding heat collecting hot water in a primary pipeline network into a condenser of the water source heat pump unit, feeding a part of water absorbing heat into a first heat exchange device for heat exchange and returning the same to a condenser after being cooled, meanwhile, heating pipeline water of the secondary heat supply pipeline network of A-class heat users by heat exchange, and heating the pipeline water through a gas pitch-peak boiler and supplying heat for the A-class heat users; enabling the other part of water to exchange heat with the pipeline water in the secondary heat supply pipeline network of B-class heat users and returning the same to the condenser after being cooled, meanwhile, supplying heat of the pipeline water of the secondary heat supply pipeline network after heating by heat exchange for the B-class heat users. By the combination method, energy utilization efficiency for industrial enterprises is improved.
Description
Technical field
The present invention relates to industrial cooling circulating water bootstrap system and method, relate in particular to industrial cooling circulating water waste heat and regional heating and unite the method for utilizing.
Background technology
China is in urban construction fast-developing period at present, and the ratio of building energy consumption account whole nation total energy consumption rises to about 27.5%.The existing building of China has reached more than 400 hundred million m
2, and with newly-built 16 to 2,000,000,000 m in every year
2Speed increasing.Therefore, the market demand of building energy consumption and building heating energy consumption is very big.According to the data of Chinese Research Institute for Building Sciences, northern China cities and towns house energy consumption is about 2.07 hundred million tons of mark coals, accounts for 76% of national cities and towns house energy consumption, and wherein 65% is heating energy consumption.The about 1.3 hundred million tons of standard coals of northern area heating energy consumption account for 34% of national building energy consumption.We can say that the northern area building heating energy consumption is the maximum part of China's building energy consumption.
Owing to receive the influence of China's energy resource structure, technology, economic dispatch factor; China's building and heating energy is main with coal still at present; Main thermal source is cogeneration power plant, central heating boiler room; And the district boiler room that disperses etc., both aggravated the energy supply pressure, be with the serious environmental pollution again.Therefore, seek new, the low pollution or free of contamination building heating thermal source, just seem particularly urgent and necessary.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of utilization ratio that can improve primary energy is provided, reduce the low-temperature industrial cooling circulating water waste heat and the regional heating integrated processes of coal-fired consumption of heat supply and environmental pollution.
Low-temperature industrial cooling circulating water waste heat of the present invention and regional heating integrated processes, it may further comprise the steps:
(1) 20-30 ℃ low-temperature industrial cooling circulating water is sent into by circulating pump in the evaporimeter of water source heat pump units, emits to turn back to behind the heat in the commercial production flow process and continues to use as cooling water;
40-50 ℃ heating hot water gets in the condenser of water resource heat pump in (2) pipe networks; Absorb a water part that is elevated to 60-70 ℃ behind the heat get into be cooled to after the first heat-exchanger rig heat exchange return condensed device after 40-50 ℃ simultaneously the first pipeline water in the hot user's secondary of the category-A heating network after the first heat-exchanger rig heat exchange is warming up to 60-65 ℃; By the gas peak regulation boiler the first pipeline water is heated to 70-75 ℃ again and supplies the hot user heating of category-A; The first pipeline water is reduced to 40-45 ℃ after heat radiation; Return first heat-exchanger rig heat absorption back temperature again and be elevated to 60-65 ℃ again, get into the hot user heating formation of category-A secondary net hot water circuit again thereby be heated to 70-75 ℃ through the gas peak regulation boiler again; Another part temperature be cooled to after 60-70 ℃ water and the pipeline water heat exchange in the hot user's secondary of the category-B heating network return condensed device after 35-45 ℃ simultaneously the temperature of the second pipeline water in the hot user's secondary of the category-B heating network after heat exchange, be warming up to 45-55 ℃ and directly supply the hot user heating of category-B; The second pipeline water is reduced to 35-45 ℃ and turns back to the second heat-exchanger rig heat exchange again after heat radiation indoor, forms secondary net hot water circuit.
Advantage of the present invention: utilizing low-temperature industrial waste heat and central heating association system can the present low-temperature industrial waste heat that directly is discharged in the environment be converted into can be by the thermal source of the direct higher temperature that utilizes of hot user heating; Thereby improve the efficiency of energy utilization of industrial enterprise, reduce the consumption of primary energy such as fire coal and the pollutant discharge amount of environment.
Description of drawings
Accompanying drawing is the structural representation of low-temperature industrial cooling circulating water waste heat of the present invention and regional heating association system.
The specific embodiment
Describe the present invention below in conjunction with accompanying drawing and specific embodiment.
Low-temperature industrial cooling circulating water waste heat of the present invention and regional heating integrated processes shown in accompanying drawing; It may further comprise the steps: the low-temperature industrial cooling circulating water that (1) is 20-30 ℃; Send into by circulating pump in the evaporimeter of water source heat pump units, emit to turn back to behind the heat in the commercial production flow process and continue to use as cooling water; 40-50 ℃ heating hot water gets in the condenser of water resource heat pump in (2) pipe networks; Absorb a water part that is elevated to 60-70 ℃ behind the heat get into be cooled to after the first heat-exchanger rig heat exchange return condensed device after 40-50 ℃ simultaneously the first pipeline water in the hot user's secondary of the category-A heating network after the first heat-exchanger rig heat exchange is warming up to 60-65 ℃; By the gas peak regulation boiler the first pipeline water is heated to 70-75 ℃ again and supplies the hot user heating of category-A; The first pipeline water is reduced to 40-45 ℃ after heat radiation; Return first heat-exchanger rig heat absorption back temperature again and be elevated to 60-65 ℃ again, get into the hot user heating formation of category-A secondary net hot water circuit again thereby be heated to 70-75 ℃ through the gas peak regulation boiler again; Another part temperature be cooled to after 60-70 ℃ water and the pipeline water heat exchange in the hot user's secondary of the category-B heating network return condensed device after 35-45 ℃ simultaneously the temperature of the second pipeline water in the hot user's secondary of the category-B heating network after heat exchange, be warming up to 45-55 ℃ and directly supply the hot user heating of category-B; The second pipeline water is reduced to 35-45 ℃ and turns back to the second heat-exchanger rig heat exchange again after heat radiation indoor, forms secondary net hot water circuit.
A kind of device implementation as the inventive method is as shown in the figure, and this device comprises: (1) waste heat extraction element 1; (2) water source heat pump units 2 that comprise choke valve, compressor, condenser and evaporimeter; The hot water inlet of the evaporimeter of described water source heat pump units links to each other with the delivery port of waste heat extraction element through first pipeline, and the hot water outlet of the evaporimeter of described water source heat pump units links to each other with the water return outlet of waste heat extraction element through second pipeline that first circulating pump is housed on it; (3) the first heat-exchanger rig 3-1 and the second heat-exchanger rig 3-2; The delivery port of the condenser of described water source heat pump units links to each other with the tube side import of the first heat-exchanger rig 3-1 through the 3rd pipeline that the second circulating pump 4-2 is housed on it; The tube side outlet of described first heat-exchanger rig links to each other with the water inlet of the condenser of water source heat pump units through the 4th pipeline that the 3rd circulating pump 4-3 is housed on it; One end of the 5th pipeline and described the 3rd pipeline that is positioned at the second circulating pump 4-2 port of export are connected and are provided with and the 5th pipeline other end links to each other with the tube side arrival end of the second heat-exchanger rig 3-2, and be connected setting and the 6th pipeline other end of an end and described the 4th pipeline that is positioned at the 3rd circulating pump 4-3 port of export that the 6th pipeline of the 4th pump 4-4 is housed on it links to each other with the tube side port of export of second heat-exchanger rig; The outlet of the shell side of described first heat-exchanger rig with its on the first heat supply outlet pipeline of first valve is installed an end link to each other; The shell side import of described first heat-exchanger rig with its on the first heat supply water return pipeline of the 5th circulating pump 4-5 is installed an end link to each other; Between described first heat supply outlet pipeline and heat supply water return pipeline, be connected with the hot user 7-1 of category-A of the bright dress radiator heating of a plurality of employings, be provided with the pipeline that second valve, gas peak regulation boiler 5 and the 3rd valve are installed on it successively in parallel connection on the water inlet of first valve and the first heat supply outlet pipeline between the hot user of a plurality of category-A; The shell side outlet of the described second heat-exchanger rig 3-2 links to each other with an end of the second heat supply outlet pipeline; The shell side import of described second heat-exchanger rig with its on the second heat supply water return pipeline of the 6th circulating pump 4-6 is installed an end link to each other, between the described second heat supply outlet pipeline and the second heat supply water return pipeline, be connected with the hot user 7-2 of category-B of a plurality of employing radiation floor heating.Described water source heat pump units 2 is on sale in market.
The main effect of waste heat extraction element is from industrial exhaust heat, to extract heat; The effect of water resource heat pump is to utilize the heat of low temperature exhaust heat to produce high-temperature-hot-water through contrary Carnot cycle; The effect of heat-exchanger rig is with the hot water of the exchange heat of once netting hot water to the secondary net; The effect of circulating pump is that the circulation for heating hot water provides power; The effect of gas peak regulation boiler is in order to satisfy the demand of portion of hot user to higher hot water, and hot user is the part of heating system.
Embodiment 1
(1) 25 ℃ low-temperature industrial cooling circulating water is sent into by circulating pump in the evaporimeter of water source heat pump units, emits to turn back to behind the heat in the commercial production flow process and continues to use as cooling water; 45 ℃ heating hot water gets in the condenser of water resource heat pump in (2) pipe networks; Absorb a water part that is elevated to 65 ℃ behind the heat get into be cooled to after the first heat-exchanger rig heat exchange return condensed device after 45 ℃ simultaneously the first pipeline water in the hot user's secondary of the category-A heating network after the first heat-exchanger rig heat exchange is warming up to 62 ℃; By the gas peak regulation boiler the first pipeline water is heated to 72 ℃ again and supplies the hot user heating of category-A; The first pipeline water is reduced to 42 ℃ after heat radiation; Return first heat-exchanger rig heat absorption back temperature again and be elevated to 62 ℃ again, get into the hot user heating formation of category-A secondary net hot water circuit again thereby be heated to 72 ℃ through the gas peak regulation boiler again; Another part temperature be cooled to after 65 ℃ water and the pipeline water heat exchange in the hot user's secondary of the category-B heating network return condensed device after 40 ℃ simultaneously the temperature of the second pipeline water in the hot user's secondary of the category-B heating network after heat exchange, be warming up to 50 ℃ and directly supply the hot user heatings of category-B; The second pipeline water is reduced to 40 ℃ and turns back to the second heat-exchanger rig heat exchange again after heat radiation indoor, forms the secondary pipe network hot water circuit.
After the project of 438.93 ten thousand square metres of total area of heat-supply services was gone into operation, the heat altogether in each heating season was about 1700525GJ, utilizes industrial exhaust heat 1204847GJ.Compare with direct coal heating, primary energy ratio is equivalent to annual 41110 tons of the standard coals of practicing thrift up to 146%, economizes on water 296092 tons/year simultaneously, reduces CO
2Discharge 107708 tons/year, reduce SO
2Discharge 987 tons/year, reduce NO
xDischarge 373 tons/year.
Embodiment 2
(1) 20 ℃ low-temperature industrial cooling circulating water is sent into by circulating pump in the evaporimeter of water source heat pump units, emits to turn back to behind the heat in the commercial production flow process and continues to use as cooling water; 40 ℃ heating hot water gets in the condenser of water resource heat pump in (2) pipe networks; Absorb a water part that is elevated to 60 ℃ behind the heat get into be cooled to after the first heat-exchanger rig heat exchange return condensed device after 40 ℃ simultaneously the first pipeline water in the hot user's secondary of the category-A heating network in first heat-exchanger rig after heat exchange is warming up to 60 ℃; By the gas peak regulation boiler the first pipeline water is heated to 70 ℃ again and supplies the hot user heating of category-A; The first pipeline water is reduced to 40 ℃ after heat radiation; Return first heat-exchanger rig heat absorption back temperature again and be elevated to 60 ℃ again, get into the hot user heating formation of category-A secondary net hot water circuit again thereby be heated to 70 ℃ through the gas peak regulation boiler again; Another part temperature be cooled to after 60 ℃ water and the pipeline water heat exchange in the hot user's secondary of the category-B heating network return condensed device after 35 ℃ simultaneously the temperature of the second pipeline water in the hot user's secondary of the category-B heating network after heat exchange, be warming up to 45 ℃ and directly supply the hot user heatings of category-B; The second pipeline water is reduced to 35 ℃ and turns back to the second heat-exchanger rig heat exchange again after heat radiation indoor, forms the secondary pipe network hot water circuit.
After the project of 2,000,000 square metres of total area of heat-supply services was gone into operation, the heat altogether in each heating season was about 772960GJ, utilizes industrial exhaust heat 547657GJ.Compare with direct coal heating, primary energy ratio is equivalent to annual 18686 tons of the standard coals of practicing thrift up to 140%, economizes on water 134584 tons/year simultaneously, reduces CO
2Discharge 48953 tons/year, reduce SO
2Discharge 448 tons/year, reduce NO
xDischarge 169 tons/year.
Embodiment 3
(1) 30 ℃ low-temperature industrial cooling circulating water is sent into by circulating pump in the evaporimeter of water source heat pump units, emits to turn back to behind the heat in the commercial production flow process and continues to use as cooling water; 50 ℃ heating hot water gets in the condenser of water resource heat pump in (2) pipe networks; Absorb a water part that is elevated to 70 ℃ behind the heat get into be cooled to after the first heat-exchanger rig heat exchange return condensed device after 50 ℃ simultaneously the first pipeline water in the hot user's secondary of the category-A heating network after the first heat-exchanger rig heat exchange is warming up to 65 ℃; By the gas peak regulation boiler the first pipeline water is heated to 75 ℃ again and supplies the hot user heating of category-A; The first pipeline water is reduced to 45 ℃ after heat radiation; Return first heat-exchanger rig heat absorption back temperature again and be elevated to 65 ℃ again, get into the hot user heating formation of category-A secondary net hot water circuit again thereby be heated to 75 ℃ through the gas peak regulation boiler again; Another part temperature be cooled to after 70 ℃ water and the pipeline water heat exchange in the hot user's secondary of the category-B heating network return condensed device after 45 ℃ simultaneously the temperature of the second pipeline water in the hot user's secondary of the category-B heating network after heat exchange, be warming up to 55 ℃ and directly supply the hot user heatings of category-B; The second pipeline water is reduced to 45 ℃ and turns back to the second heat-exchanger rig heat exchange again after heat radiation indoor, forms the secondary pipe network hot water circuit.
After the project of 3,500,000 square metres of total area of heat-supply services was gone into operation, the heat altogether in each heating season was about 1502361GJ, utilizes industrial exhaust heat 1102336GJ.Compare with direct coal heating, primary energy ratio is equivalent to annual 37612 tons of the standard coals of practicing thrift up to 152%, economizes on water 26617 tons/year simultaneously, reduces CO
2Discharge 94030 tons/year, reduce SO
2Discharge 940 tons/year, reduce NO
xDischarge 338 tons/year.
Claims (1)
1. low-temperature industrial cooling circulating water waste heat and regional heating integrated processes is characterized in that it may further comprise the steps:
(1) 20-30 ℃ low-temperature industrial cooling circulating water is sent into by circulating pump in the evaporimeter of water source heat pump units, emits to turn back to behind the heat in the commercial production flow process and continues to use as cooling water;
40-50 ℃ heating hot water gets in the condenser of water resource heat pump in (2) pipe networks; Absorb a water part that is elevated to 60-70 ℃ behind the heat get into be cooled to after the first heat-exchanger rig heat exchange return condensed device after 40-50 ℃ simultaneously the first pipeline water in the hot user's secondary of the category-A heating network after the first heat-exchanger rig heat exchange is warming up to 60-65 ℃; By the gas peak regulation boiler the first pipeline water is heated to 70-75 ℃ again and supplies the hot user heating of category-A; The first pipeline water is reduced to 40-45 ℃ after heat radiation; Return first heat-exchanger rig heat absorption back temperature again and be elevated to 60-65 ℃ again, get into the hot user heating formation of category-A secondary net hot water circuit again thereby be heated to 70-75 ℃ through the gas peak regulation boiler again; Another part temperature be cooled to after 60-70 ℃ water and the pipeline water heat exchange in the hot user's secondary of the category-B heating network return condensed device after 35-45 ℃ simultaneously the temperature of the second pipeline water in the hot user's secondary of the category-B heating network after heat exchange, be warming up to 45-55 ℃ and directly supply the hot user heating of category-B; The second pipeline water is reduced to 35-45 ℃ and turns back to the second heat-exchanger rig heat exchange again after heat radiation indoor, forms secondary net hot water circuit.
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|---|---|---|---|
| CN201210101536.3A CN102607091B (en) | 2012-04-09 | 2012-04-09 | Combination method of waste heat of low-temperature industrial circulating cooling water and regional centralized heat supply |
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| CN201210101536.3A CN102607091B (en) | 2012-04-09 | 2012-04-09 | Combination method of waste heat of low-temperature industrial circulating cooling water and regional centralized heat supply |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017230A (en) * | 2012-12-05 | 2013-04-03 | 大连优力特换热设备制造有限公司 | Double-heat supply heat exchanger unit |
| CN103185332A (en) * | 2012-10-08 | 2013-07-03 | 哈尔滨工大金涛科技股份有限公司 | Water-to-steam heating method and steam direct-heating machine |
| CN103256756A (en) * | 2013-05-31 | 2013-08-21 | 锦西天然气化工有限责任公司 | Chemical industry device circulating water cooling, low-grade heat energy utilization and water saving system and method |
| CN104949184A (en) * | 2015-07-06 | 2015-09-30 | 珠海格力电器股份有限公司 | Water waste heat recovery heating system and water waste heat recovery heating method |
| CN108072088A (en) * | 2016-11-15 | 2018-05-25 | 长春中安鸿程伟业节能科技有限公司 | A kind of central heating secondary network electric heating pump peak regulation system |
| CN108930996A (en) * | 2017-05-22 | 2018-12-04 | 山西三合盛节能环保技术股份有限公司 | A kind of provide multiple forms of energy to complement each other heating system and the heat supply method of cascaded utilization of energy |
| CN109631131A (en) * | 2018-12-21 | 2019-04-16 | 哈尔滨工业大学 | A kind of central heating system based on thermal radiation transmission pipe |
| CN111981552A (en) * | 2020-05-22 | 2020-11-24 | 太原大四方节能环保股份有限公司 | Heat pump and gas boiler combined heating system and regulation and control method thereof |
| CN113091122A (en) * | 2021-05-11 | 2021-07-09 | 杭州英集动力科技有限公司 | Afterburning type building heat exchange unit and regulation and control method thereof |
| CN113757772A (en) * | 2021-09-22 | 2021-12-07 | 孟伟 | Multi-heat-source complementary heating system and method |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103185332A (en) * | 2012-10-08 | 2013-07-03 | 哈尔滨工大金涛科技股份有限公司 | Water-to-steam heating method and steam direct-heating machine |
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| CN103017230B (en) * | 2012-12-05 | 2016-01-20 | 大连优力特换热设备制造有限公司 | Two for heat-exchange unit |
| CN103017230A (en) * | 2012-12-05 | 2013-04-03 | 大连优力特换热设备制造有限公司 | Double-heat supply heat exchanger unit |
| CN103256756A (en) * | 2013-05-31 | 2013-08-21 | 锦西天然气化工有限责任公司 | Chemical industry device circulating water cooling, low-grade heat energy utilization and water saving system and method |
| CN104949184B (en) * | 2015-07-06 | 2018-01-23 | 珠海格力电器股份有限公司 | Water waste heat recovery heating system and water waste heat recovery heating method |
| CN104949184A (en) * | 2015-07-06 | 2015-09-30 | 珠海格力电器股份有限公司 | Water waste heat recovery heating system and water waste heat recovery heating method |
| CN108072088A (en) * | 2016-11-15 | 2018-05-25 | 长春中安鸿程伟业节能科技有限公司 | A kind of central heating secondary network electric heating pump peak regulation system |
| CN108930996A (en) * | 2017-05-22 | 2018-12-04 | 山西三合盛节能环保技术股份有限公司 | A kind of provide multiple forms of energy to complement each other heating system and the heat supply method of cascaded utilization of energy |
| CN108930996B (en) * | 2017-05-22 | 2024-03-26 | 山西三合盛智慧科技股份有限公司 | Multi-energy complementary heat supply system and heat supply method for energy cascade utilization |
| CN109631131A (en) * | 2018-12-21 | 2019-04-16 | 哈尔滨工业大学 | A kind of central heating system based on thermal radiation transmission pipe |
| CN111981552A (en) * | 2020-05-22 | 2020-11-24 | 太原大四方节能环保股份有限公司 | Heat pump and gas boiler combined heating system and regulation and control method thereof |
| CN111981552B (en) * | 2020-05-22 | 2021-12-14 | 太原大四方节能环保股份有限公司 | Heat pump and gas boiler combined heating system and regulation and control method thereof |
| CN113091122A (en) * | 2021-05-11 | 2021-07-09 | 杭州英集动力科技有限公司 | Afterburning type building heat exchange unit and regulation and control method thereof |
| CN113757772A (en) * | 2021-09-22 | 2021-12-07 | 孟伟 | Multi-heat-source complementary heating system and method |
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