CN103225909B - Cold-and-hot separated type multiple configuration control method and application of double heat source heating system - Google Patents
Cold-and-hot separated type multiple configuration control method and application of double heat source heating system Download PDFInfo
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- CN103225909B CN103225909B CN201310094325.6A CN201310094325A CN103225909B CN 103225909 B CN103225909 B CN 103225909B CN 201310094325 A CN201310094325 A CN 201310094325A CN 103225909 B CN103225909 B CN 103225909B
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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- Y02E10/44—Heat exchange systems
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Abstract
The invention relates to a cold-and-hot separated type multiple configuration control method and application of a double heat source heating system. The method comprises steps as follows: a valve is used for connection and is controlled to be opened, closed or adjusted, so that a main heat source device, an auxiliary heat source device and a heat storage water tank can supply heat for a heat needed side independently and respectively, and a main heat source can be connected with an auxiliary heat source or the front end of the heat storage water tank respectively in series to form series combination and supply heat. In any work state, a high temperature working medium can get in and out of a hot side port of the heat storage water tank only, and a low temperature working medium can get in and out of a cold side port of the heat storage water tank only. Particularly when solar and electrical energy priced according to time is used, the solar energy substitution rate can be improved, and peak load shifting and valley load filling of the electric energy can be achieved. Configuration logic of the method is embedded into software of a control device, so that the device can be intelligentized.
Description
Technical field
The present invention relates to the cold and hot cellular-type multiconfiguration control method of a kind of pair of heat supply system, and two heat supply systems of application the method.The present invention can be applicable to the control unit that solar energy heat utilization field uses.
Background technology
In the prior art, extensively adopt two heat supply systems with heat accumulation function, wherein main heat source can be solar energy, and auxiliary thermal source can be natural gas, electric power etc.In this class heat supply process, generally take the heat of main heat source first to send into hot water storage tank (storage tank), then by the mode of hot water storage tank outward supplying heat.
Auxiliary heating source for heating equipment generally has three kinds of access waies in system architecture:
The first, as shown in fig. 1, auxiliary heating source for heating equipment 1 is positioned in hot water storage tank 3, there are two kinds of work assembled state (hereinafter to be referred as " configuration ") in heating system: the temperature of main heat source 2 heating working mediums quits work when heat supply temperature lower than design, auxiliary heating source for heating equipment 1 is opened working medium is heated, main heat source 2 heating working mediums reach or put into operation when heat supply temperature higher than design, auxiliary heating source for heating equipment 1 stops working medium heating, and this belongs to the major-minor thermal source system architecture using in parallel.
Two kinds of corresponding courses of work of configuration are:
1) when working medium through main heat source 2(as solar thermal collector) heating and temperature be during higher than design heat supply temperature, enters hot water storage tank 3 under the promotion of pump 5, auxiliary heating source for heating equipment 1 closes.Due to Action of Gravity Field, the high temperature refrigerant at hot water storage tank 3 tops can not sink, and becomes cryogenic fluid after entering 4 heat releases of heat demand side under the effect of pump 6, enters hot water storage tank 3 bottoms through pump 6.Due to Action of Gravity Field, the cryogenic fluid of hot water storage tank 3 bottoms can not float equally, enters main heat source 2 heated under the effect of pump 5, and working medium has completed a heating for thermal cycle.
2) when working medium, after main heat source 2, temperature is lower than design heat supply temperature, and pump 5 stops, and auxiliary heating source for heating equipment 1 is opened heating.The high temperature refrigerant of hot water storage tank 3 tops through heating after 4 heat releases of heat demand side, enters hot water storage tank 3 bottoms through pump 6 under the effect of pump 6.Because pump 5 stops, under the effect of pump 6, the cryogenic fluid of hot water storage tank 3 bottoms floats and heats through auxiliary heating source for heating equipment 1, completes a heating for thermal cycle.
Main heat source 2 and auxiliary heating source for heating equipment 1 alternation in a manner described, form two configurations.Guarantee that on the one hand hot water storage tank 3 top Temperature of Workings are higher than design heat supply temperature, one side is avoided work conflict between main heat source 2, auxiliary thermal source 1.But the greatest problem of this heating system is under two configurations, all to have the problem of the upper and lower mixed flow disturbance of working medium of accelerating internal tank.Because having reduced the temperature difference of upper and lower working medium in container, mixed flow disturbance relatively reduces heat supply temperature, cause auxiliary heating source for heating equipment 1 to shift to an earlier date (or postponement) and enter (or exiting) heating work, result is to have extended the working time of auxiliary heating source for heating equipment 1 on the one hand, thereby has increased energy consumption; Be the working time that has shortened main heat source 2 and hot water storage tank 3 on the other hand, reduced solar thermal utilization efficiency and hot water storage tank heat storage efficiency.
The second, as shown in Figure 2, auxiliary heating source for heating equipment 1 is in hot water storage tank 3 outsides, and in parallel with hot water storage tank 3, and configuration and configuration condition are identical with the first connected mode.When the temperature of main heat source 2 heating working mediums quits work during lower than design heat supply temperature, pump 5 stops, and disconnects hot water storage tank 3, and auxiliary heating source for heating equipment 1 is opened working medium heating, and working medium forms circulation through pump 6, auxiliary heating source for heating equipment 1, heat demand side 4; When main heat source 2 heating working mediums reach or put into operation when heat supply temperature higher than design, auxiliary heating source for heating equipment 1 place pipeline disconnects, and stops working medium heating.The second connected mode is parallel-connection structure equally, the first connected mode relatively, the mixed flow disturbance to hot water storage tank 3 when which has avoided auxiliary heating source for heating equipment 1 to devote oneself to work, but the mixed flow perturbed problem of unresolved main heat source 2 to hot water storage tank 3.
There is a common issue in system architecture that above-mentioned two kinds of major-minor thermals source are connected in parallel: when the have the ability Temperature of Working of heating after making Temperature of Working at hot water storage tank 3 tops higher than 4 heat releases of heat demand side but during lower than design heat supply temperature of main heat source 2, the heat of this heating period can not be utilized, and this is the waste to the transition state energy.
Three, as shown in Figure 3, the working medium of sending from hot water storage tank 3 enters 4 heat supplies of heat demand side after auxiliary heating source for heating equipment 1, on this basis, increases the bypass line of being controlled commutation by two triple valves 7,8 at hot water storage tank 3 two ends.This connected mode has three kinds of configurations: when Temperature of Working that hot water storage tank 3 is exported higher than after 4 heat releases of heat demand side, send Temperature of Working time, bypass disconnects and connects hot water storage tank 3, be equivalent to major-minor thermal source series connection, and produce two kinds of configurations: the temperature of exporting working medium when hot water storage tank 3 is during lower than design heat supply temperature, auxiliary heating source for heating equipment 1 is opened heating, Temperature of Working during higher than design heat supply temperature auxiliary heating source for heating equipment 1 close; After temperature that hot water storage tank 3 is exported working medium is lower than 4 heat releases of heat demand side, send Temperature of Working time, bypass is connected, and disconnects hot water storage tank 3, auxiliary heating source for heating equipment 1 independent heat supply.
Specific works process is as follows:
In the time that main heat source 2 heating efficiencies drop to the temperature of hot water storage tank 3 top Temperature of Workings after lower than 4 heat releases of heat demand side, triple valve 7 and 8 is connected bypass lines, and disconnects energy storage water tank 5, and this is identical with foregoing the second method of attachment, repeats no more.
When Temperature of Working is in the time that main heat source 2 heats higher than temperature after 4 heat releases of heat demand side, triple valve 7 and 8 disconnects bypass lines.Energy storage water tank 3, triple valve 7, auxiliary heating source for heating equipment 1, heat demand side 4, pump 6, triple valve 8 connect successively, form channels in series.Now, when hot water storage tank 3 top Temperature of Workings in the Temperature of Working higher than after 4 heat releases of heat demand side but lower than design heat supply temperature transition state time, auxiliary heating source for heating equipment 1 is opened; When hot water storage tank 3 top Temperature of Workings are higher than design when heat supply temperature, auxiliary heating source for heating equipment 1 is closed.Although the combination of above-mentioned latter two configuration has solved the problem of transition state energy waste, the imbalance of the circulation of both sides and both sides flow can be accelerated mixed flow disturbance.
Because above-mentioned system architecture of the prior art cannot be set up the configuration method that can make main heat source 2 and hot water storage tank 3 separate work, and in the time that working, hot water storage tank 3 always there is unnecessary mixed flow disturbance, therefore seriously reduce the service efficiency of main heat source 2 and the heat storage efficiency of hot water storage tank 3, also greatly shortened the effective time of hot water storage tank 3.
Summary of the invention
The problem existing for prior art, the object of the present invention is to provide the cold and hot cellular-type multiconfiguration control method of a kind of pair of heat supply system, and applies two heat supply systems of the method.
The two cold and hot cellular-type multiconfiguration of the heat supply system control methods of the present invention, described two heat supply systems comprise main heat source, auxiliary thermal source, hot water storage tank, pump, heat demand side apparatus, in system, between each part, be connected by pipeline, described heating system makes by control valve being set on described pipeline the master that flows through, auxiliary thermal source, hot water storage tank, pump, and the circulation path of the working medium of heat demand side apparatus all can independently separate, to can form following duty and change between each configuration, to realize in the mixed flow disturbance of eliminating or reduce hot water storage tank to produce, improve the utilization ratio of main heat source, realize the peak load shifting to auxiliary thermal source:
1) make main heat source, auxiliary thermal source, hot water storage tank carry out heat supply to heat demand side apparatus separately respectively;
2) make the working medium can be more respectively through auxiliary thermal source or the heat supply of hot water storage tank thermotropism Demand-side equipment after main heat source;
3) make main heat source, auxiliary thermal source carry out heat supply to heat demand side apparatus and hot water storage tank separately respectively simultaneously;
4) make working medium can be after main heat source again through auxiliary thermal source thermotropism Demand-side equipment and hot water storage tank heat supply simultaneously, and the heat ratio of supplying with heat demand side apparatus and hot water storage tank can be adjusted;
5) hot water storage tank has two ports, and one of them port is connected with the entry and exit of described pump respectively by valve, under any configuration, guarantees that high temperature refrigerant is only from a port turnover of hot water storage tank, and cryogenic fluid only passes in and out from another port of hot water storage tank.
Further, the configuration of described pair of heat supply system specifically comprises:
1. described in, hot water storage tank is as heat demand side apparatus, while carrying out accumulation of heat,
Described in 1.1, main heat source is separately hot water storage tank heat supply,
Described in 1.2, auxiliary thermal source is separately hot water storage tank heat supply,
Described in 1.3, after main heat source and the series connection of described auxiliary thermal source, be hot water storage tank heat supply;
2. described in, hot water storage tank is disconnected completely, directly by leading and/or auxiliary thermal source during to described heat demand side apparatus heat supply,
Described in 2.1, main heat source is separately the heat supply of heat demand side apparatus,
Described in 2.2, auxiliary thermal source is separately the heat supply of heat demand side apparatus,
Described in 2.3, after main heat source and the series connection of described auxiliary thermal source, be the heat supply of heat demand side apparatus;
3. by described master and/or auxiliary thermal source during simultaneously to described heat demand side apparatus and described hot water storage tank heat supply, now, heat demand side apparatus and hot water storage tank are in state in parallel, and hot water storage tank carries out accumulation of heat,
The independent heat supply of main heat source described in 3.1,
The independent heat supply of auxiliary thermal source described in 3.2,
Heat supply after main heat source and the series connection of described auxiliary thermal source described in 3.3;
By described master and/or auxiliary thermal source to described hot water storage tank heat supply, then by hot water storage tank during to described heat demand side apparatus heat supply,
The independent heat supply of main heat source described in 4.1,
Heat supply after main heat source and the series connection of described auxiliary thermal source described in 4.2.
Further, described main heat source is connected on the front end of described auxiliary thermal source, for the working medium that enters auxiliary heating source for heating is carried out preheating, the heat producing in transition state to make full use of main heat source, described transition state refers to the Temperature of Working of main heat source heating higher than the Temperature of Working after the heat release of heat demand side apparatus, but lower than the design heat supply temperature of heat demand side apparatus.
Further, described control method utilizes control device to control the described control valve arranging on described pipeline, realizes the automatic control of the course of work under automatic conversion to described heating system configuration and each configuration.
A kind of two heat supply system, comprises main heat source, auxiliary thermal source, hot water storage tank, pump, heat demand side apparatus, in system, between each part, is connected by pipeline; On described pipeline, be provided with control valve, the circulation path of working medium of main and auxiliary thermal source, hot water storage tank, pump and heat demand side apparatus of making to flow through all can independently separate, and makes main heat source, auxiliary thermal source, hot water storage tank carry out heat supply to heat demand side apparatus separately respectively; Hot water storage tank has a hot side ports and a cold side port, and under any configuration, the high temperature refrigerant in heating system is all the time from the hot side ports turnover of hot water storage tank, and cryogenic fluid passes in and out from the cold side port of hot water storage tank all the time.
Further, described heating system also comprises control device, by this control device, the described control valve arranging on described pipeline is controlled, and realizes the automatic control of the course of work under automatic conversion to described heating system configuration and each configuration.
The present invention all can independently separate by the circulation path of the working medium of make to flow through main and auxiliary thermal source, hot water storage tank, pump and heat demand side apparatus, make main heat source, auxiliary thermal source, hot water storage tank carry out heat supply to heat demand side apparatus separately respectively, eliminate or reduced the mixed flow disturbance to hot water storage tank from operation logic, also making the heat of main heat source under transition state be fully used simultaneously.
Especially in the time using the electric power energy of solar energy and count by time sharing, both can improve the energy substitution rate of solar energy, again can be to electric energy peak load shifting.By in the software of the configuration logic embedded control system of this method, just can this device is intelligent.
Brief description of the drawings
Fig. 1 is prior art heating system the first version schematic diagram;
Fig. 2 is prior art heating system the second version schematic diagram;
Fig. 3 is the third version schematic diagram of prior art heating system;
Fig. 4 is the cold and hot cellular-type multiconfiguration control method systematic schematic diagram of the two heat supply systems of the present invention.
In figure, 11 main heat sources, 14 auxiliary heating source for heating equipment, 15 pumps, 19 triplet commutations and control valve, 22 heat demand side apparatus, 24 hot water storage tanks, 12,13,16,17,18,20,21,23 control valves, T1, T2, T3, T4 temperature sensor, K1, K2, K3, K4, K5, K6, K7, K8 port.
Detailed description of the invention
It shown in Fig. 4, is control method principle schematic of the present invention.
As shown in Figure 4, main heat source 11 has four kinds of duties: when working medium is in the time that main heat source 11 port K2 export, and according to its temperature T 1 difference, selectively opened valve 13,16 or 17.
When valve 13 is opened, working medium is exported heat supply by pump 15 after auxiliary heating source for heating equipment 14, and this is main and auxiliary thermal source cascaded structure, and main heat source 11 provides preheating for auxiliary thermal source.
When valve 17 is opened, working medium is exported heat supply through valve 18 by pump 15 after hot water storage tank 24, and this is the structure that main heat source is connected with hot water storage tank 24, the at this moment status of hot water storage tank 24 in auxiliary thermal source, and energy storage water tank 24 has absorbed the heat of main heat source 11.
Above-mentioned two kinds of configurations have fully reclaimed heat when main heat source 11 is in an interim state.
When valve 16 is opened, the heat that working medium is exported main heat source 11 through pump 15 carries out heat supply, and main heat source 11 is in direct heating state, and disconnects completely with hot water storage tank 24.
When valve 13,16,17 cuts out, port K1 and the K2 of main heat source 11 can not form loop, are the halted state of main heat source 11, and disconnect completely with hot water storage tank 24.
Under above-mentioned two kinds of states that disconnect completely with hot water storage tank 24, main heat source 11 does not produce any disturbance to energy storage water tank 24.
Auxiliary heating source for heating equipment 14 has three kinds of duties: in the time that valve 12 is opened, the cryogenic fluid after 22 heat releases of heat demand side apparatus enters auxiliary heating source for heating equipment 14 and heats, by pump 15 heat supplies; Valve 13 comes from the working medium heated (this state is already described) of main heat source 11 while opening; The halted state of auxiliary heating source for heating equipment 14 in circulating when valve 12,13 cuts out.
The working medium of hot water storage tank 24 of flowing through is two-way.In the time that valve 18 is opened, high temperature refrigerant is from the port K7 output of hot water storage tank 24, and through pump 15 heat supplies, port K8 is entrance, and now hot water storage tank 24 is Heating State.Hot water storage tank 24, under Heating State, has two kinds of configuration modes: when valve 17 cuts out, valve 23 is while opening, hot water storage tank 24 direct thermotropism Demand-side equipment 22 heat supplies; Valve 17 is opened, the state of valve 23 while closing is already described.Under this two states, hot water storage tank has in fact all replaced the function of auxiliary thermal source.In the time of main heat source 11 or auxiliary thermal source 14 independences or combined heat, if valve 19 points to valve 20 and valve 20 while opening, a part for 15 heating loads of pump enters hot water storage tank 24 from port K7, and now hot water storage tank 24 is energy accumulating state, port K8 is sender property outlet, and now valve 17 cuts out, valve 23 opens.From the generic analysis of Top, now hot water storage tank 24 has been placed on heat demand side.High temperature refrigerant passes in and out from port K7 all the time, thereby port K7 is defined as to hot side.Corresponding port K8 is defined as cold side, only allows cryogenic fluid turnover.When valve 17,18,23 cuts out and valve 19 points to valve 21(valve 17,18,20,23 and cuts out) time, hot water storage tank 24 is in halted state, and with the external world, working medium do not occur and exchange, and stopped mixed flow disturbance completely.
Further, in valve 19,20,21, can a retention valve 19, cancel valve 20,21, or retention valve 20,21 only, cancel valve 19, can not affect any effect of system configuration.
Valve 19(or valve 20,21, or valve 19,20,21) bear the distribution function of the heat supply working medium that carrys out self-pumping 15 between heat demand side 22 and energy storage water tank 24.In the time of accumulation of energy or outdoor freezing prevention tubing, can adjust allocation proportion according to the heat consumption of heat demand side 22, reach and ensure accumulation of energy object to greatest extent or antifreezing effect under heating quality prerequisite.At hot water storage tank 24, in heat supply or while stopping, the working medium flow of distributing to energy storage water tank 24 is 0.
Further, hot water storage tank 24 does not limit for the thermal source state of accumulation of energy, only depends on from pump 15 through valve 19(or valve 20,21) distribute working medium ratio.At main heat source 11 independent heatings, auxiliary thermal source 14 independent heatings or heat under three kinds of states through the laggard auxiliary thermal source 14 of main heat source 11 preheating, hot water storage tank 24 all can enter accumulation of heat state.
From accompanying drawing 4 and above-mentioned analysis, hot water storage tank 24 is under any duty, there is not mulitpath, only have the single hot side ports that is positioned at top and the single cold side port that is positioned at below, its flow only depends on Self-heat-storage amount and heating load, with heat source side and heat demand side duty all without direct relation, thereby reduced to greatest extent mixed flow disturbance factor.
Further, the state that described main heat source 11, auxiliary thermal source 14, hot water storage tank 24 and heat demand side 22 can be set up separately combines, and has just produced complete configuration method of the present invention.By in the software of whole logic embedded control systems of this configuration method, just can this device is intelligent.
Conventionally can be by the position of energy device lower energy expenditure relative price (such as solar thermal collection system) access main heat source 11, by the position of the access auxiliary thermal sources 14 such as energy device higher energy expenditure relative price (heated by natural gas equipment (comprising Central Air-Conditioner), electric heating equipment (comprising heat pump)).In the time of electric heating system access auxiliary thermal source 14, native system is again by further completing the peak load shifting function of price difference electricity to the heat accumulation function of auxiliary thermal source 14 especially.
Further, without loss of generality, access K1, K2 end after some heat resource equipments can being connected with certain combination, as main heat source 11, access K3, K4 end after other some heat resource equipments can being connected with certain combination equally, as auxiliary heating source for heating 14.
Claims (5)
1. the two cold and hot cellular-type multiconfiguration of a heat supply system control method, described two heat supply systems comprise main heat source, auxiliary thermal source, hot water storage tank, pump, heat demand side apparatus, in system, between each part, be connected by pipeline, it is characterized in that, described heating system makes by control valve being set on described pipeline the master that flows through, auxiliary thermal source, hot water storage tank, pump, and the circulation path of the working medium of heat demand side apparatus all can independently separate, to can form following duty and change between each configuration, to realize in the mixed flow disturbance of eliminating or reduce hot water storage tank to produce, improve the utilization ratio of main heat source, realize the peak load shifting to auxiliary thermal source:
1) make main heat source, auxiliary thermal source, hot water storage tank carry out heat supply to heat demand side apparatus separately respectively;
2) make the working medium can be more respectively through auxiliary thermal source or the heat supply of hot water storage tank thermotropism Demand-side equipment after main heat source;
3) make main heat source, auxiliary thermal source carry out heat supply to heat demand side apparatus and hot water storage tank separately respectively simultaneously;
4) make working medium can be after main heat source again through auxiliary thermal source thermotropism Demand-side equipment and hot water storage tank heat supply simultaneously, and the heat ratio of supplying with heat demand side apparatus and hot water storage tank can be adjusted;
5) hot water storage tank has two ports, and one of them port is connected with the entry and exit of described pump respectively by valve, under any configuration, guarantees that high temperature refrigerant is only from a port turnover of hot water storage tank, and cryogenic fluid only passes in and out from another port of hot water storage tank.
2. control method as claimed in claim 1, it is characterized in that, described main heat source is connected on the front end of described auxiliary thermal source, for the working medium that enters auxiliary heating source for heating is carried out preheating, the heat producing in transition state to make full use of main heat source, described transition state refers to the Temperature of Working of main heat source heating higher than the Temperature of Working after the heat release of heat demand side apparatus, but lower than the design heat supply temperature of heat demand side apparatus.
3. control method as claimed in claim 1, it is characterized in that, described control method utilizes control device to control the described control valve arranging on described pipeline, realizes the intellectuality control of the course of work under automatic conversion to described heating system configuration and each configuration.
4. two heat supply systems, comprise main heat source, auxiliary thermal source, hot water storage tank, pump, heat demand side apparatus, in system, between each part, are connected by pipeline; It is characterized in that, on described pipeline, be provided with control valve, the circulation path of the working medium of make to flow through main and auxiliary thermal source, hot water storage tank, pump and heat demand side apparatus all can independently separate, to can form following duty and change between each configuration:
1) make main heat source, auxiliary thermal source, hot water storage tank carry out heat supply to heat demand side apparatus separately respectively;
2) make the working medium can be more respectively through auxiliary thermal source or the heat supply of hot water storage tank thermotropism Demand-side equipment after main heat source;
3) make main heat source, auxiliary thermal source carry out heat supply to heat demand side apparatus and hot water storage tank separately respectively simultaneously;
4) make working medium can be after main heat source again through auxiliary thermal source thermotropism Demand-side equipment and hot water storage tank heat supply simultaneously, and the heat ratio of supplying with heat demand side apparatus and hot water storage tank can be adjusted;
5) hot water storage tank has two ports, and one of them port is connected with the entry and exit of described pump respectively by valve, under any configuration, guarantees that high temperature refrigerant is only from a port turnover of hot water storage tank, and cryogenic fluid only passes in and out from another port of hot water storage tank.
5. system as claimed in claim 4, it is characterized in that, described heating system also comprises control device, by this control device, the described control valve arranging on described pipeline is controlled, and realizes the intellectuality control of the course of work under automatic conversion to described heating system configuration and each configuration.
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| CN108870742A (en) * | 2017-05-10 | 2018-11-23 | 青岛经济技术开发区海尔热水器有限公司 | A kind of novel Double energy source water heating system and control method |
| CN107860141B (en) * | 2017-09-22 | 2020-03-24 | 同济大学 | Testing method of constant output energy efficiency testing system of solar composite heat source system |
| CN109764389A (en) * | 2019-03-07 | 2019-05-17 | 北京咏辉飏能源科技发展有限公司 | The double heat supply systems of cold and hot cellular-type multiconfiguration with heat pump |
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| CN101871700A (en) * | 2009-04-22 | 2010-10-27 | 钱伟民 | Double source parallel step type heat pump hot water air-conditioning system |
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| JPS57131964A (en) * | 1981-02-10 | 1982-08-16 | Matsushita Electric Ind Co Ltd | Solar heat utilizing hot-water storing tank |
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| CN101871700A (en) * | 2009-04-22 | 2010-10-27 | 钱伟民 | Double source parallel step type heat pump hot water air-conditioning system |
| CN101988775A (en) * | 2010-11-16 | 2011-03-23 | 山东建筑大学 | Solar-air-geothermal multisource dual-machine heat pump heat supply and air conditioning composite system |
| CN202254364U (en) * | 2011-09-15 | 2012-05-30 | 甘肃一德节能环保有限公司 | Double-heat-source central water heating device |
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