CN204128049U - Combustion pond-ground hot coil coupling heating plant - Google Patents
Combustion pond-ground hot coil coupling heating plant Download PDFInfo
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- CN204128049U CN204128049U CN201420526447.8U CN201420526447U CN204128049U CN 204128049 U CN204128049 U CN 204128049U CN 201420526447 U CN201420526447 U CN 201420526447U CN 204128049 U CN204128049 U CN 204128049U
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Abstract
A kind of combustion pond-ground hot coil coupling heating plant, belongs to resource reutilization and energy-saving building technology field.It is characterized in that this device is using flue gas and water as heat transfer medium, flue gas in combustion pond on the one hand by heating combustion pond cover plate in the mode of convection current and radiation to indoor radiating, on the other hand by the water in the coil pipe of heating combustion pond by transfer of heat in hot coil, heating the ground of building two layers makes two layers of ground heat two layers of room air in the mode of convection current and radiation equally, and final common realization is heated while in architectural lower chamber.Effect of the present utility model and benefit are improved the indoor thermal comfort of building two layers, achieve the cascade utilization of combustion pond self-energy, the uncomfortable problem of heat that the temperature difference solving the overheated and architectural lower floor of combustion pond cover plate causes greatly, the cost of material is low for the employing of this device, good economy performance, the good heating effect to the two-layer indoor of building, easy and Integration of building, suits large area to popularize.
Description
Technical field
The utility model belongs to resource reutilization and energy-saving building technology field, relate to a kind of combustion pond and ground hot coil coupling heating plant, particularly relate to the radiant heat transfer of combustion pond cover plate, the transfer of heat between combustion pond coil pipe and ground hot coil, the radiation of ground hot coil and heat convection.
Background technology
Report 2012 annual data displays according to the energy-conservation annual developmental research of Chinese architecture, the house overall floorage of rural areas in our country increases year by year, is about 23,000,000,000 m at grange area in 2010
2, account for 50% of national overall floorage.Result display according to investigations, northern country energy resource consumption accounts for 56% of national rural area total energy consumption, and the rural energy consumption more than 80% needs for heating, is exactly therefore winter heating at the energy for building that the northern area of China is the most outstanding.The traditional heating mode in northern country area mainly contains a heatable brick bed, native heating installation, stove etc., it has the shortcomings such as indoor environment is poor, temperature fluctuation is large, heating cost is high, along with growth in the living standard, peasant requires higher to the comfortableness of indoor thermal environment, cause the usage ratio of commodity energy to raise gradually, make the consumption of the energy even more serious.Simultaneously, rural area all can produce a large amount of agricultural waste materials every year, and the method processing these biomass fuels is mostly field burning, the pernicious gases such as carbon monoxide, nitrogen oxide and the sulfur dioxide produced in burning process are caused to enter air, environment is produced and pollutes, and the dangerous generation such as fire and traffic accident can be there is.Therefore, in order to make full use of biomass energy, reducing the energy resource consumption of China, avoiding the regenerative resource of rural area to cause waste, improve indoor thermal environment and thermal comfort simultaneously, need to propose good heating effect, make full use of energy and be applicable to the technological means of popularization.
Along with the continuous progress of society, the economic condition of rural area have also been obtained fast development, all increases in house, and peasant starts to build two-layer house.But, for northern country winter, traditional heating mode is a heatable brick bed, native heating installation etc., and these heating systems have the shortcomings such as intermittence, indoor temperature be unstable, and for rural area two-layer building be difficult to adopt existing traditional heating mode to realize indoor thermal comfort.
Combustion pond is generally built in one deck below ground, it is with stalk, the agricultural waste materials such as corncob carry out compacting as fuel and glow, take full advantage of the distinctive biomass energy in rural area, making combustion pond is directly the heating of one deck architecture indoor, and for current two-layer building, only adopt combustion pond heating separately can not ensure the thermal environment that building two layers is indoor, cause there is the larger temperature difference between architectural time, cause the hot discomfort of people, simultaneously show the temperature distributing disproportionation of the combustion pond cover plate of one deck below ground according to road test settlement even, easy appearance local is too high, easily cause scald.Therefore, in order to make full use of heat, improve efficiency of utilization, indoor air quality, improve the indoor thermal comfort of two-layer island-type construction, reduce the impact that the temperature difference between architectural lower floor produces, need to be optimized combustion pond and expansion combustion pond and combine with other heating, extend heating cycle, simultaneously in conjunction with hot-water coil pipe heat radiation all with and the comfortable feature of health, improve indoor thermal comfort.But, current lifting combustion pool technology, combustion pond is combined with other heat-supplying modes or system, the research of the temperature difference improve heat supply distributing homogeneity, improve heat cascade utilization, reducing levels indoor is less, combustion pond and coil pipe combine by this utility model patent, may be used on, in two-layer above island-type construction, can making full use of biomass fuel, realize combustion pond heat supply, hot coil radiant heat transfer, effectively improve indoor environment.
Find through retrieval: the patent No. 02210130.6 discloses a kind of energy-saving air heater having heat generating device for sunlight greenhouse, base plate and the T-shaped shape of cover plate, form a T-shaped combustion pond with inner chamber, and fire inside, pond and be provided with insulation lining, this device utilizes combustion pond to combine with heliogreenhouse, once light and can reach 2-3 month to greenhouse heating, crop normal growth can be ensured.The patent No. 200420070368.7 discloses heat exchange heating installation in a kind of heliogreenhouse fuel pool ground, this device is the thermal-collecting tube in original combustion pond internal fixtion two groups of transverse directions, thermal-collecting tube is identical with adjacent plenum, the surface soil temperature in heliogreenhouse can be made to be heated evenly, to meet the requirement of chamber crop to soil surface face.Application number 201110054921.2 invention is a kind of utilizes hot water heating integrated system based on combustion pond, this system adds hot-water line on the basis in tradition combustion pond, hot-water line is connected with radiator, enter after water in hot-water line is heated in radiator and energy trasfer can be recycled, significantly reduce the phenomenon that the local temperature of combustion pond cover plate is too high.Application number 201220133794.5 discloses a kind of raised flooring type combustion pond radiant heating plant, this device take air as transmission medium, by combustion pond cover plate and the radiation of thin metal material, conductive force by the air heat in raised flooring layer above it, heat can be delivered in the Floor-board frame dead level of whole building uniformly, reduce the temperature difference of Indoor Residential Ecological adjacent room.The patent No. 200620021631.2 discloses a kind of Water-proof underground fuel pool, and this patent can be avoided pouring water outside combustion pond going deep in pond with underground water effectively, ensures the normal combustion in combustion pond.
Summary of the invention
The purpose of this utility model is to provide a kind of combustion pond-ground hot coil coupling heating plant, two-layer island-type construction is heated, it is respectively to fire in pond in flue gas and coil pipe water as heat transfer transmission medium, flue gas in underground fuel pool fires pond cover plate by heating on the one hand makes it in the mode of convection current and radiation to one deck indoor radiating, flue gas on the other hand in combustion pond by the water in the coil pipe of heating combustion pond by transfer of heat in the ground hot coil of building two layers, heating the ground of building two layers makes two layers of ground heat room air in the mode of convection current and radiation equally, the final common Appropriate application realized the bilevel indoor heating of building and countryside biomass energy source, solve combustion pond utilization ratio low and architectural lower two-layer between the hot discomfort that causes greatly of the indoor temperature difference.
The technical solution of the utility model is: a kind of combustion pond-ground hot coil coupling heating plant, whole device comprises four parts: underground fuel pool layer, one deck heating layer, Flows layer, two layers of heating layer, and wherein underground fuel pool layer comprises charging aperture cover plate 1, combustion pond, pond body 2, ventilation duct 3, filter 4, combustion pond coil pipe 5, combustion pond cover plate 6, chimney 9, closing door 22, feed tank body 23, charging aperture 24.One deck heating layer comprises one deck packed layer 7, one deck ground floor 8.Flows layer comprises combustion pond coil pipe 5, feed pipe 16, return pipe 17, water pump 18, control valve 19, expansion tank 20, filling pipe 21, water knockout drum 25, water collector 26.Two layers heating layer comprise two floor plates, 10, two layers of heat insulation layer, 11, two layers of packed layer, 12, two layers of screed-coat, 13, two layers of decorative layer 14, hot coil 15.Heat is passed to combustion pond cover plate 6 and one deck packed layer 7 and then is imported one deck ground floor 8 into by combustion pond, pond body 2 inner fuel smouldering, wherein fire pond cover plate 6 and be positioned at combustion body 2 top, pond, pond, one deck packed layer 7 is positioned at combustion cover plate 6 top, pond, one deck ground floor 8 is positioned at one deck packed layer 7 top, the heat of one deck ground floor 8 is by radiation with to flow direction building one deck indoor radiating, fire the combustion pond coil pipe 5 of heat heating combustion cover plate 6 bottom, pond of inside, pond simultaneously, take water as medium by transfer of heat to two layers of indoor ground hot coil 15, wherein hot coil 15 is positioned at two layers of packed layers 12 inside.
Combustion pond coil pipe 5 is positioned at combustion cover plate 6 bottom, pond, combustion pond cover plate 6 is made up of reinforced concrete prefabricated board, the combustion pond coil pipe delivery port 5-1 of combustion pond coil pipe 5 is connected with water knockout drum 25 one end, the combustion pond coil inlets 5-2 of combustion pond coil pipe 5 is connected with water collector 26 one end, water knockout drum 25 other end is connected with the underground heat coil inlets 15-1 of ground hot coil 15, the ground hot coil delivery port 15-2 of ground hot coil 15 is connected with water collector 26 other end, the hot water of combustion pond, pond body 2 inner fuel combustion heating enters in water knockout drum 25 by the combustion pond coil pipe delivery port 5-1 and feed pipe 16 firing pond coil pipe 5, enter the underground heat coil inlets 15-1 of ground hot coil 15 afterwards, the ground hot coil delivery port 15-2 that hot water enters ground hot coil 15 at ground hot coil 15 internal circulation flow enters water collector 26 then, and the combustion pond coil inlets 5-2 of combustion pond coil pipe 5 is entered by return pipe 17, feed pipe 16 and return pipe 17 all arrange control valve 19 to regulate hot water flow, and water pump 18 and expansion tank 20 are set on return pipe 17, to ensure the normal operation of water circulation, the left side of expansion tank 20 arranges filling pipe 21.
The two-layer structure of combustion pond-ground hot coil coupling heating plant is by two floor plates 10, two layers of heat insulation layer 11, two layers of packed layer 12, two layers of screed-coat 13, two layers of decorative layer 14, ground hot coil 15 forms, wherein two-layer structure foot arranges two floor plates 10, two floor plates 10 adopt concrete slab, what be positioned at two floor plate 10 tops is two layers of heat insulation layer 11, the material of two layers of heat insulation layer 11 is polystyrol plastic foam plate, on two layers of heat insulation layer 11 top, two layers of packed layer 12 are set, two layers of packed layer 12 inside adopt pea gravel concrete, it is inner that ground hot coil 15 is fixed on two layers of packed layer 12, the material of ground hot coil 15 is crosslinked polyethylene pipe, two layers of packed layer 12 top set gradually two layers of screed-coat 13 and two layers of decorative layer 14.
The fuel combustion speed of combustion body 2 inside, pond, pond utilizes ventilation duct 3 to carry out air quantity regulable control, wherein ventilation duct 3 one end is positioned at feed tank body 23 side and communicates with outside, the other end is positioned at closing door 22 top and is connected with body 2 inside, combustion pond, pond, the flue gas that the burning of combustion pond, pond body 2 inner fuel produces enters and fires in chimney 9 that body 2 side, pond, pond is connected, discharges after filter 4 filtration, purification from chimney 9.
Effect of the present utility model and benefit: make full use of biomass energy, is heated to two-layer island-type construction with ground hot coil ingenious combining in combustion pond, the ground of partial heat to building one deck of wherein firing pond coil pipe is heated, partial heat is heated building two layers of ground by the ground hot coil on two layers of ground simultaneously, improve the thermal comfort that building two layers is indoor, achieve the cascade utilization of combustion pond self-energy, the uncomfortable problem of heat that the temperature difference that this technology solves the overheated and architectural lower floor of combustion pond cover plate causes greatly, the cost of material is low for the employing of this device, good economy performance, to the good heating effect of the two-layer indoor of building, easily and Integration of building, suit large area to popularize.Enforcement of the present utility model is significant in rural energy utilization with new countryside construction.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of combustion pond-ground hot coil coupling heating plant.
Fig. 2 is the decomposing schematic representation of combustion pond-ground hot coil coupling heating plant.
Fig. 3 is the A-A generalized section of pond, the combustion pond body of combustion pond-ground hot coil coupling heating plant.
Fig. 4 is the B-B generalized section of pond, the combustion pond body of combustion pond-ground hot coil coupling heating plant.
Fig. 5 is the C-C generalized section of the two-layer structure of combustion pond-ground hot coil coupling heating plant.
In figure: 1 charging aperture cover plate; 2 combustion Chi Chiti; 3 ventilation ducts; 4 filters; 5 combustion pond coil pipes; 5-1 fires pond coil pipe delivery port; 5-2 fires pond coil inlets; 6 combustion pond cover plates; 7 one deck packed layers; 8 one deck ground floors; 9 chimneys; 10 2 floor plates; 11 2 layers of heat insulation layer; 12 2 layers of packed layer; 13 2 layers of screed-coat; 14 2 layers of decorative layer; 15 ground hot coils; 15-1 underground heat coil inlets; 15-2 ground hot coil delivery port; 16 feed pipes; 17 return pipes; 18 water pumps; 19 control valves; 20 expansion tanks; 21 filling pipes; 22 closing doors; 23 feed tank bodies; 24 charging apertures; 25 water knockout drums; 26 water collectors.
Detailed description of the invention
Illustrate below in conjunction with technical scheme and accompanying drawing and describe detailed description of the invention of the present utility model in detail.
Embodiment 1:
As Figure 1-5, this combustion pond-ground hot coil coupling heating plant comprises four parts: underground fuel pool layer, one deck heating layer, Flows layer, two layers of heating layer, wherein underground fuel pool layer comprises charging aperture cover plate 1, combustion pond, pond body 2, ventilation duct 3, filter 4, combustion pond coil pipe 5, combustion pond cover plate 6, chimney 9, closing door 22, feed tank body 23, charging aperture 24, one deck heating layer comprises one deck packed layer 7, one deck ground floor 8, Flows layer comprises combustion pond coil pipe 5, feed pipe 16, return pipe 17, water pump 18, control valve 19, expansion tank 20, filling pipe 21, water knockout drum 25, water collector 26, two layers of heating layer comprise two floor plates 10, two layers of heat insulation layer 11, two layers of packed layer 12, two layers of screed-coat 13, two layers of decorative layer 14, ground hot coil 15, combustion pond, pond body 2 is positioned at building one deck subsurface, for rectangle, the degree of depth is 1.4 meters, charging aperture 24 is positioned at feed tank body 23 top, charging aperture cover plate 1 is provided with on charging aperture 24 top, be provided with closing door 22 entering between combustion pond, pond body 2 and charging aperture cover plate 1 bottom, scattering and disappearing of heat is reduced when being convenient to fuel combustion, this closing door 22 can freely open and close, the fuel combustion speed of combustion body 2 inside, pond, pond utilizes ventilation duct 3 to carry out air quantity regulable control, by controlling to enter the air capacity in combustion pond to the adjustment of air quantity, air capacity number determine the speed of burning velocity.Wherein ventilation duct 3 one end is positioned at feed tank body 23 side and communicates with outside, the other end is positioned at closing door 22 top and is connected with body 2 inside, combustion pond, pond, the flue gas that the burning of combustion pond, pond body 2 inner fuel produces enters and fires in chimney 9 that body 2 side, pond, pond is connected, discharge from chimney 9 after filter 4 filtration, purification, decrease the pollution of pernicious gas to air, wherein fire pond cover plate 6 and be positioned at combustion body 2 top, pond, pond.
Embodiment 2:
As Fig. 1, shown in 2, combustion pond cover plate 6 in this combustion pond-ground hot coil coupling heating plant is made up of reinforced concrete prefabricated board, combustion cover plate 6 top, pond be one deck packed layer 7, one deck packed layer 7 can ensure that in combustion pond, even heat is transferred to one deck ground floor 8, the also Packed effect of tool simultaneously, prevent combustion pond flue gas from revealing in indoor, one deck packed layer 7 top is one deck ground floor 8, heat to be passed to combustion pond cover plate 6 and one deck packed layer 7 through smouldering and then is imported one deck ground floor 8 into by combustion pond, pond body 2 inner fuel, the heat of one deck ground floor 8 is by radiation with to flow direction building one deck indoor radiating, fire the combustion pond coil pipe 5 of heat heating combustion cover plate 6 bottom, pond of inside, pond simultaneously, take water as medium by transfer of heat to two layers of indoor ground hot coil 15, wherein hot coil 15 is positioned at two layers of packed layers 12 inside.
Embodiment 3:
As Fig. 1, shown in 2, combustion pond coil pipe 5 in this combustion pond-ground hot coil coupling heating plant is fixed on the bottom of combustion pond cover plate 6, the combustion pond coil pipe 5 of heat heating combustion cover plate 6 bottom, pond of combustion inside, pond, the combustion pond coil pipe delivery port 5-1 of combustion pond coil pipe 5 is connected with water knockout drum 25 one end, the combustion pond coil inlets 5-2 of combustion pond coil pipe 5 is connected with water collector 26 one end, water knockout drum 25 other end is connected with the underground heat coil inlets 15-1 of ground hot coil 15, the ground hot coil delivery port 15-2 of ground hot coil 15 is connected with water collector 26 other end, the hot water of combustion pond, pond body 2 inner fuel combustion heating enters in water knockout drum 25 by the combustion pond coil pipe delivery port 5-1 and feed pipe 16 firing pond coil pipe 5, enter the underground heat coil inlets 15-1 of ground hot coil 15 afterwards, the ground hot coil delivery port 15-2 that hot water enters ground hot coil 15 at ground hot coil 15 internal circulation flow enters water collector 26 then, and the combustion pond coil inlets 5-2 of combustion pond coil pipe 5 is entered by return pipe 17, feed pipe 16 and return pipe 17 all arrange control valve 19 to regulate hot water flow, and water pump 18 and expansion tank 20 are set on return pipe 17, to ensure the normal operation of water circulation, the left side of expansion tank 20 arranges filling pipe 21, utilize expansion tank 20 and filling pipe 21 to meet the requirement of pressure and the water yield.
Embodiment 4:
As shown in Fig. 1,2,5, two layers of heating layer in this combustion pond-ground hot coil coupling heating plant by two floor plates, 10, two layers of heat insulation layer, 11, two layers of packed layer, 12, two layers of screed-coat, 13, two layers of decorative layer 14, hot coil 15 form.Wherein, two floor plates 10 are positioned at the bottom of two-layer structure, two floor plates 10 adopt concrete slab to make, two layers of heat insulation layer 11 are set directly over two floor plates 10, two layers of heat insulation layer 11 adopt material to be Polystyrene plastic plate, this heat insulation layer 11 dispels the heat in order to avoid the heat of ground hot coil 15 to bottom, two layers of ground, makes the heat as much as possible upwards radiation on ground.Two layers of heat insulation layer 11 top arrange two layers of packed layer 12, the inside of two layers of packed layer 12 adopts pea gravel concrete, ground hot coil 15 is fixed in two layers of packed layer 12, the material of ground hot coil 15 is crosslinked polyethylene pipe, the effect of two layers of packed layer 12 is hot coils 15 and increase thermal resistance regularly, makes heat that in ground hot coil 15, hot water brings evenly provide required energy for the indoor of building two layers.The top of two layers of packed layer 12 sets gradually two layers of screed-coat 13 and two layers of decorative layer 14, and wherein to adopt cement mortar to carry out floating for two layers of screed-coat 13, and two layers of decorative layer 14 can adopt ceramic tile or other ornament materials to decorate.
Claims (4)
1. fire pond-ground hot coil coupling heating plant, comprise charging aperture cover plate (1), combustion Chi Chiti (2), combustion pond coil pipe (5), combustion pond cover plate (6), one deck packed layer (7), one deck ground floor (8), two floor plates (10), two layers of heat insulation layer (11), two layers of packed layer (12), two layers of screed-coat (13), two layers of decorative layer (14), ground hot coil (15), feed pipe (16), return pipe (17), water knockout drum (25), water collector (26), it is characterized in that: combustion Chi Chiti (2) inner fuel imports heat into one deck ground floor (8) by combustion pond cover plate (6) and one deck packed layer (7) by smouldering, wherein fire pond cover plate (6) and be positioned at combustion Chi Chiti (2) top, one deck packed layer (7) is positioned at combustion cover plate (6) top, pond, one deck ground floor (8) is positioned at one deck packed layer (7) top, the heat of one deck ground floor (8) is by radiation with to flow direction building one deck indoor radiating, fire combustion pond coil pipe (5) of heat heating combustion cover plate (6) bottom, pond of inside, pond simultaneously, take water as medium by transfer of heat to the indoor ground hot coil (15) of building two layers, wherein hot coil (15) is positioned at two layers of packed layers (12) inside.
2. one combustion pond according to claim 1-ground hot coil coupling heating plant, it is characterized in that: combustion pond coil pipe (5) is positioned at combustion cover plate (6) bottom, pond, combustion pond cover plate (6) is made up of reinforced concrete prefabricated board, combustion pond coil pipe delivery port (5-1) of combustion pond coil pipe (5) is connected with water knockout drum (25), combustion pond coil inlets (5-2) of combustion pond coil pipe (5) is connected with water collector (26), water knockout drum (25) is connected with the underground heat coil inlets (15-1) on ground hot coil (15), ground hot coil delivery port (15-2) on ground hot coil (15) is connected with water collector (26), water knockout drum (25) and water collector (26) are connected ground, multiple room hot coil respectively, the hot water of combustion Chi Chiti (2) inner fuel combustion heating enters in water knockout drum (25) by combustion pond coil pipe delivery port (5-1) and feed pipe (16) of firing pond coil pipe (5), enter the underground heat coil inlets (15-1) on ground hot coil (15) afterwards, ground hot coil delivery port (15-2) that hot water enters ground hot coil (15) at ground hot coil (15) internal circulation flow enters water collector (26) then, and combustion pond coil inlets (5-2) of combustion pond coil pipe (5) is entered by return pipe (17), feed pipe (16) and return pipe (17) all arrange control valve (19), and water pump (18) and expansion tank (20) are set on return pipe (17), the left side of expansion tank (20) arranges filling pipe (21).
3. one combustion pond according to claim 1-ground hot coil coupling heating plant, it is characterized in that: the two-layer structure of this combustion pond-ground hot coil coupling heating plant is by two floor plates (10), two layers of heat insulation layer (11), two layers of packed layer (12), two layers of screed-coat (13), two layers of decorative layer (14), ground hot coil (15) composition, wherein two-layer structure foot arranges two floor plates (10), what be positioned at two floor plate (10) tops is two layers of heat insulation layer (11), the material of two layers of heat insulation layer (11) is Polystyrene plastic plate, on two layers of heat insulation layer (11) top, two layers of packed layer (12) are set, the inside of two layers of packed layer (12) adopts pea gravel concrete, it is inner that ground hot coil (15) is in two layers of packed layer (12), the material on ground hot coil (15) is crosslinked polyethylene pipe, two layers of packed layer (12) top set gradually two layers of screed-coat (13) and two layers of decorative layer (14).
4. one combustion pond according to claim 1-ground hot coil coupling heating plant, it is characterized in that: the fuel combustion speed of combustion Chi Chiti (2) inside utilizes ventilation duct (3) to carry out air quantity regulable control, wherein ventilation duct (3) one end is positioned at the side of feed tank body (23) and communicates with outside, the other end is positioned at closing door (22) top and communicates with combustion Chi Chiti (2) inside, the flue gas that the burning of combustion Chi Chiti (2) inner fuel produces enters and fires in chimney (9) that Chi Chiti (2) side is connected, discharge from chimney (9) after filter (4) filtration, purification.
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| CN201420526447.8U CN204128049U (en) | 2014-09-12 | 2014-09-12 | Combustion pond-ground hot coil coupling heating plant |
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| CN201420526447.8U CN204128049U (en) | 2014-09-12 | 2014-09-12 | Combustion pond-ground hot coil coupling heating plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266253A (en) * | 2014-09-12 | 2015-01-07 | 大连理工大学 | Fire pit-terrestrial heat coil coupled heating system |
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2014
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266253A (en) * | 2014-09-12 | 2015-01-07 | 大连理工大学 | Fire pit-terrestrial heat coil coupled heating system |
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