CN200952781Y - Heating and hot-water two-purpose device - Google Patents

Heating and hot-water two-purpose device Download PDF

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Publication number
CN200952781Y
CN200952781Y CN 200620009652 CN200620009652U CN200952781Y CN 200952781 Y CN200952781 Y CN 200952781Y CN 200620009652 CN200620009652 CN 200620009652 CN 200620009652 U CN200620009652 U CN 200620009652U CN 200952781 Y CN200952781 Y CN 200952781Y
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CN
China
Prior art keywords
heating
water
temperature
pipeline
loop
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Expired - Lifetime
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CN 200620009652
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Chinese (zh)
Inventor
孙京岩
闫小勤
王任华
陈炳泉
曹立国
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Haier Group Corp
Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd
Original Assignee
Haier Group Corp
Qingdao Economic and Technological Development Zone Haier Water Heater Co Ltd
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Priority to CN 200620009652 priority Critical patent/CN200952781Y/en
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Publication of CN200952781Y publication Critical patent/CN200952781Y/en
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Abstract

The utility model discloses a two-purpose device for both heat supplying and water heating, which comprises a water storage tank, in which a heat exchanger for a heating oven is installed. The inlet and the outlet of the heat exchanger pipeline are respectively connected through pipes with the outlet and the inlet of the heating pipe of the heating oven, so a heat-exchanging circuit of heating oven is formed. In the water storage tank, additionally a solar heat exchanger is provided. The inlet and the outlet of the solar heat exchanger pipeline are respectively connected through pipes with the outlet and the inlet of the heating pipe of the solar heat collector, so a solar heat-exchanging circuit is formed, on which an external circulation water pump is installed. The inlet and the outlet of the heating pipe of the heating oven are also respectively connected with the outlet and the inlet of the radiator, so a heating circuit is formed. On the heating pipe of the heating oven, an internal circulation water pump is installed. The utility model can take full use of the solar energy for heating and heating water, so as to save energy, in addition, the utility model can solve any problem due to unsteadiness of solar and realize steady heating and supplying of hot water.

Description

A kind of double-purpose apparatus for warming and heating water
Technical field
The utility model relates to a kind of heater, relates in particular to a kind of double-purpose apparatus for warming and heating water.
Background technology
At present, heating and hot-water supply device have been the devices of family's indispensability.Because both have many common ground, and the multiple dual-purpose apparatus that domestic heating and hot-water supply are provided has simultaneously been arranged under the prior art.
The heating of prior art and hot-water dual-purpose device adopt combustion gas, fuel oil or electric energy as the energy mostly, and be very big to the consumption of the energy.Make heating, energy that hot water consumed account for the very big proportion of family's power consumption, in the area of weather cold, the power consumption of heating, hot water is more.
Under the prior art, the heating, the hot-water dual-purpose device that adopt solar energy are arranged also, this device can be saved a large amount of energy, is a kind of mode that is worthy to be popularized.But itself has unstability solar energy, often can not provide the stable energy to supply the usefulness of heating and heat hot water.
Summary of the invention
At above-mentioned defective, the technical problem that the utility model solves is, a kind of double-purpose apparatus for warming and heating water is provided, this device can make full use of solar energy and carry out heating, heat hot water, thereby reach purpose of energy saving, simultaneously, this device can also solve the problem that the unstability of solar energy is brought, and realizes stable heating and hot water is provided.
The device that the utility model provides comprises:
Water tank, the heating stove heat exchanger is installed in the water tank, the import of this heat exchange manifold is connected by pipeline with the export and import of the heating tube of heating stove respectively with outlet, form the heating stove heat-exchanging loop, it is characterized in that also having solar heat exchanger in the described water tank, the import of this heat exchange manifold is connected by pipeline with the export and import of the heating tube of solar thermal collector respectively with outlet, form the solar heat-exchange loop, external water circulating pump is installed on this loop; The import of the heating tube of described heating stove also is connected the export and import of radiator respectively with outlet, forms heating loop, on the heating tube pipeline of heating stove built-in circulating water pump is installed; Work under the control of the central control unit of this device in above-mentioned loop.
The pipeline that described heating stove heating tube outlet is connected with the import of described heating stove heat exchanger connects the pipeline that leads to the radiator import by triple valve; Described triple valve is used to switch heating stove heating circuit and heating loop.
Described water tank top is equipped with expansion tank and hot water outlet pipe; The water tank bottom is equipped with running water inlet water pipe.
Described water tank top is equipped with first temperature-sensing probe that detects the hot water temperature; The water tank bottom is equipped with second temperature-sensing probe that detects the water tank inflow temperature; Near on the pipeline position of the described solar thermal collector heating tube mouth of pipe, the 3rd temperature-sensing probe is installed; Above-mentioned temperature-sensing probe is measured the temperature value that obtains and is sent to described central control unit, is used to control the work of this device.
When selecting solar energy preferential, described central control unit judges at first whether temperature value that described first temperature-sensing probe records reaches the design temperature of hot water, if do not reach, whether the difference of then further judging the temperature that the temperature that the 3rd temperature-sensing probe records and second temperature-sensing probe record is higher than 10 ℃, if then described central control unit is controlled described external water circulating pump work; When selecting heating stove to heat when preferential, described central control unit judges at first whether temperature value that described first temperature-sensing probe records reaches the design temperature of hot water, if do not reach, then described central control unit is controlled described heating stove and is begun heating, and the work of control built-in circulating water pump.
When needs heating, described central control unit is controlled described triple valve and is switched to described heating loop, and controls described heating stove and built-in circulating water pump work; At this moment, heating is preferential if the user selects heating stove, and when described first temperature-sensing probe records temperature and is lower than the design temperature of hot water, then the central control unit switch three-way valve is to the heating stove heating circuit, use the water of heating stove heating circuit cylinder, after temperature reaches design temperature, control triple valve again and switch to heating loop.
On the solar energy heating loop of described double-purpose apparatus for warming and heating water hydraulic pressure switch is installed, this hydraulic pressure switch detects the force value of heat transferring medium in the solar energy heating loop, if this force value is crossed when hanging down, then described central control unit control solar energy heating loop quits work; Described solar energy heating is equipped with Pressure gauge on the loop, and this Pressure gauge is used to indicate the loine pressure in solar energy heating loop.
Preferably, near on the pipeline of the described solar thermal collector heating tube mouth of pipe, automatic exhaust steam valve is installed.
Described solar energy heating loop adopts water as heat transferring medium; Between the water pipe of the pipeline of close described solar heat exchanger import and described running water inlet, link to each other by the pipeline that water injection valve is housed, this water injection valve generally is in closed condition, when needs during water filling, are opened water injection valve to the water filling of solar energy heating loop in the solar energy heating loop.
The heating stove that described heating stove heating circuit is adopted is gas heating stove or electric furnace; Described solar thermal collector is a flat type solar heat collector.
The device that the utility model provides has two kinds of mode of heatings of combustion gas and solar energy.The mode of operation that central control unit is selected according to the user and the testing result of temperature sensor can adopt two kinds of hot water in the mode of heating cylinder, thus energy savings and obtain stable hot water supply.Because this device has made full use of solar energy, therefore, can significantly reduce energy consumption.Simultaneously, when solar energy is not enough, provide energy, guarantee to satisfy the user demand of user's hot water by heating stove.
Since this device adopt two independently heat-exchanger circuit realize the circulation exchange of heat in the water tank, can realize the independent operating of two kinds of heat exchange circulations preferably, make whole control process comparatively simple.
Description of drawings
Fig. 1 is the schematic diagram of device of the utility model first embodiment.
The specific embodiment
Please, be the schematic diagram of device of the utility model first embodiment referring to Fig. 1.
The double-purpose apparatus for warming and heating water that this embodiment provides comprises three pipeline loops such as solar energy heating loop, heating stove heating circuit, heating loop, wherein solar energy heating loop, heating stove heating circuit are used for the water storage of cylinder 17, and heating loop is used for providing heating in heating season.Described solar energy heating loop comprises heating tube 22, solar heat-exchange pipe 15 in the water tank 17 in the solar thermal collector 8 and the pipeline that connects both; Described heating stove heating circuit comprises heating stove heat exchanger tube 16 in heating tube 21 and the water tank 17 in the heating stove 1 and the pipeline that is connected both.Heating loop comprises heating tube 21, radiator 4 in the heating stove 1 and the pipeline that connects both.
Fig. 1 illustrates, and this heating hot-water dual-purpose device has water tank 17, and this water tank adopts double-decker, between shell and the inner bag insulation material is arranged, and is used for heat-insulation and heat-preservation, stored hot water.
The heating stove heat exchanger 16 of heating stove heating circuit and the solar heat exchanger 15 in solar energy heating loop are installed in this water tank 17.Two kinds of heat exchangers all adopt coil arrangement, and the coil pipe pipe interior is full of the heat transferring medium that is used for heat exchange.Consider the cost of heat transferring medium, directly make water in the present embodiment as heat transferring medium.Also can adopt other to have the heat transferring medium of heat-transfer effect more.
Water tank 17 tops are equipped with expansion tank 18, and this expansion tank 18 is used to protect water tank 17 not to be damaged.When the water in the water tank 17 was heated to higher temperature as 70 ℃, wherein the hot water volume that stores increased, increased pressure, and this expansion tank 18 can be stored the water of unnecessary volume, the pressure that balance is certain.
The top of water tank 17 is equipped with hot water tap 11, is used for taking water tank 17 hot water.
The bottom of water tank 17 is equipped with running water inlet 7, is used to connect running water pipe, to water tank 17 water fillings.
This water tank 17 also is equipped with two temperature-sensing probes.Wherein temperature-sensing probe 5 is installed in the bottom of water tank 17, is used for the water temperature of sensing water tank 17 bottoms.Temperature-sensing probe 19 is installed in the top of water tank 17, the water temperature that is used for sensing water tank 17 tops, the water temperature that temperature-sensing probe 19 records is the hot water water temperature of user when fetching water from water tank 17, can determine according to the measured value of this temperature-sensing probe 19 whether the water temperature of water tank 17 reaches setting value.
Described solar energy heating loop is the heating circuit that is formed centrally in being by solar thermal collector 8.In this heating circuit, solar thermal collector 8 is installed in the good place of outdoor sunlight condition, is used to gather solar energy.Solar thermal collector 8 can adopt various ways, and selecting preferably is to adopt flat type solar heat collector.Have heating tube in the solar thermal collector 8, be full of heat transferring medium in this heating tube, this heat transferring medium can absorb the solar energy that solar thermal collector 8 obtains, storage heat energy.
The import of described solar thermal collector heating tube and outlet respectively be installed in water tank 17 in solar heat exchanger 15 export and imports is connected, form the solar energy heating loop of closure.
External water circulating pump 14 is installed in this solar energy heating loop, and this external water circulating pump 14 is used to that the water as heat transferring medium provides circulation power in this solar energy heating loop.In the present embodiment, this external water circulating pump 14 is installed in the position near described solar heat exchanger 15 outlets.
In order to prevent that heat transferring medium in the solar energy heating loop from because loss reduces, causing the hypotony in this loop and damage this solar heat-exchange loop, Pressure gauge 12 and hydraulic pressure switch 13 are installed also on this solar energy heating loop.Described Pressure gauge 12 is installed in the high-pressure side of described external water circulating pump 14, is used to show the loine pressure in solar energy heating loop, when pressure is lower than certain numerical value, and user's heat transferring medium of should annotating.Described hydraulic pressure switch 13 is used to protect this solar energy heating loop not to be damaged equally.When circuit pressure is lower than certain numerical value, these hydraulic pressure switch 13 actions, the situation that circuit pressure is low excessively sends to central control unit, and central control unit can be dealt with in view of the above.Concrete processing mode comprises the action that stops water pump 14, and gives the alarm, and reminds user's water filling etc. in the loop.
For the ease of water filling in this solar energy heating loop, link to each other by pipeline between the water pipe of the pipeline of close described solar heat exchanger 15 imports and described running water inlet 7, water injection valve 6 is housed on this pipeline.This water injection valve 6 generally is in closed condition, when needs during water filling, can be opened water injection valve 6, so that to the water filling of solar energy heating loop in the solar energy heating loop.
Near on the pipeline of the described flat type solar heat collector 8 heating tube mouths of pipe, automatic exhaust steam valve 9 is installed also.Reach when vaporization when the heat transferring medium Yin Wendu in the solar energy heating loop is too high, this automatic exhaust steam valve 9 can be got rid of gas automatically, reaches decompression and prevents the idle purpose of locking of external water circulating pump 14.
On the close pipeline position of the described solar thermal collector 8 heating tube mouths of pipe, temperature-sensing probe 10 also is installed, this temperature-sensing probe 10 is used to detect the pipeline water temperature of solar thermal collector 8, whether the pipeline water temperature with definite solar thermal collector 8 is enough high, whether can start external water circulating pump 14 and carry out the solar heat-exchange circulation.
The heating stove heating circuit mainly comprises heating tube 21 and the described heating stove heat exchanger 16 that is installed in the water tank 17 in the heating stove 1.
Described heating stove 1 adopts conventional energy resources such as gas-fired heater or electric furnace that the energy of heating is provided, and this heating stove 1 can heat rapidly the heat transferring medium in the heating tube pipeline of this heating stove 1 of flowing through.The import of the heat exchanger tube of described heating stove 1 is connected the export and import of described heating stove heat exchanger 16 respectively with outlet by pipeline, form closed heating stove heating circuit.Be full of the heat transferring medium that is used to carry out heat exchange in the pipeline in this loop.
Described heating loop comprises heating tube 21, radiator 4 in the described heating stove 1 and the pipeline that connects both.
On the outlet of the heat exchanger tube 21 of described heating stove 1 and the pipeline that described heating stove heat exchanger 16 imports are connected, triple valve 3 is installed, connects the pipeline that leads to radiator 4 imports by this triple valve 3.The outlet of described radiator 4 connects the import of described heating tube 21 by pipeline.Described triple valve 3 can switch heating stove heating circuit and heating loop by the pipeline of gain and loss electric control conducting mutually.
On the heating tube 21 of described heating stove 1, built-in circulating water pump 2 is installed, this built-in circulating water pump 2 provides the power of heat transferring medium circulation for described heating stove heating circuit and heating loop.
In order to realize the control to this double-purpose apparatus for warming and heating water, this device has central control unit 20.This central control unit 20 is installed on the described heating stove 1, be used to receive the temperature information that each temperature-sensing probe is gathered, and the use pattern selected of user, take the design temperature of hot water etc., and this double-purpose apparatus for warming and heating water is controlled according to above-mentioned information.
In addition, this double-purpose apparatus for warming and heating water also has control elements such as some selector switches, button, and these elements can be installed on the special-purpose control panel.
Below introduce control mode to this gas-heating dual-purpose apparatus.The parameter of concrete control mode and employing can be easily by the program change, and what this place was introduced is a kind of preferred scheme.
This double-purpose apparatus for warming and heating water has hot-water supply and provides heating two big functions.In control procedure, provide the function of hot water to pay the utmost attention to.
At the non-heating season joint, this double-purpose apparatus for warming and heating water only provides hot water.At this moment, this double-purpose apparatus for warming and heating water can select to adopt the solar energy mode of priority still to select the heating stove mode of priority by selector button.Under any duty, the design temperature of hot water in the water tank 17 should be set at first all.
Generally speaking, in order to make full use of solar energy, can select the solar energy heating pattern, the control procedure under this pattern is as described below.
Central control unit 20 detects the measurement temperature of temperature-sensing probe 5,10,19 at first according to the setting of program.When the actual temperature that temperature-sensing probe 19 records equaled the design temperature of water tank 17, central control unit 20 control solar energy heating loops quit work.The actual temperature that records when temperature-sensing probe 19 is during less than the design temperature of water tank 17, starts working in central control unit 20 control solar energy heating loops.This moment, central control unit 20 detected the temperature difference of temperature-sensing probe 10,5 constantly, and when temperature difference Δ T=T10-T5 〉=10 ℃, the external water circulating pump 14 of central control unit 20 controls starts, and the solar energy heating loop begins to heat.At this moment, the water as heat transferring medium in the heating tube 22 in the solar thermal collector 8 has higher temperature owing to absorbing solar energy, and when described external water circulating pump 14 was worked, the water in this heating tube flow to described solar heat exchanger 15.This solar heat exchanger 15 is a coil arrangement, and the water of higher temperature and the water in the water tank 17 carry out heat exchange in water tank 17 these coil arrangements, and the water temperature of water tank 17 is raise.By above-mentioned heat exchange circulation, in the time of Δ T=T10-T5=0 ℃, the external water circulating pump 14 of central control unit 20 controls quits work, during up to Δ T=T10-T5 〉=10 ℃, carry out above-mentioned heat exchange circulation again, when temperature-sensing probe 19 recorded water temperature in the water tank 17 and equals design temperature, central control unit 20 control solar energy heating loops quit work.
If the work in above-mentioned solar energy heating loop is owing to the weather reason or be in reasons such as night, in the time of can't utilizing solar energy that water is heated to required temperature, can select the heating stove heating mode, at this moment, central control unit 20 is according to the setting of program, detect the actual temperature of temperature-sensing probe 19, when the actual temperature that records when temperature-sensing probe 19 equaled the design temperature of water tank 17, central control unit 20 control heating stove heating circuits quit work; When the actual temperature of temperature-sensing probe 19 during less than the design temperature of water tank 17, central control unit 20 control heating stove heating circuits are started working, triple valve 3 switches to heating stove heating circuit conducting state with pipeline, and start heating stove 1 heating work and built-in circulating water pump 2 work, the heating stove heating circuit is started working, the cold water in the cylinder 17.When the actual temperature of central control module 20 monitoring detection temperature-sensing probes 19 equaled design temperature, central control unit 20 control heating stoves 1 stopped heating, and described built-in circulating water pump 2 stops.
When being in heating season, this double-purpose apparatus for warming and heating water is used for the water storage of cylinder 17 simultaneously and uses hot water so that life to be provided, and also provides heating heat energy by the heating stove heating circuit to radiator 4 simultaneously.Because the power of the obtainable energy of the sun is lower, is not suitable for use in heating, therefore, the solar energy heating loop only is used for the water storage of cylinder 17, is not used in heating.Simultaneously, domestic hot-water's function of this double-purpose apparatus for warming and heating water is preferential.
At this moment, when selecting the solar energy heating pattern, the hot water in the central control unit 20 control solar energy heating loop cylinders.Its control procedure is identical when saving with non-heating season.Simultaneously, central control unit 20 control heating loop work.At this moment, triple valve 3 switches to heating loop, and described heating stove 1 begins heating, and described built-in circulating water pump 2 work make heat transferring medium circulation in the heating loop.Ring thermal medium process radiator 4 release heat through heating stove 1 heating reach the heating effect.
When selecting the heating stove heating mode, heating stove 1 at first obtains the water storage actual temperature that temperature-sensing probe 19 records, when if this temperature is lower than the temperature that sets, then described magnetic valve 3 switches to the heating stove heating circuit, hot water in the water tank is heated, after water temperature in water tank 17 reached and sets requirement, magnetic valve 3 switched to heating loop, carries out heat supply.
Above-mentioned control scheme is the preferred version of present embodiment, in practice, can select other suitable control schemes as required, needs according to water temperature and heating, use the heating of solar energy heating and heating stove respectively, obtain best heating hot water effect, and make full use of solar energy, to save the energy.
The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (7)

1, a kind of double-purpose apparatus for warming and heating water, comprise water tank, the heating stove heat exchanger is installed in the water tank, the import of this heat exchange manifold is connected by pipeline with the export and import of the heating tube of heating stove respectively with outlet, form the heating stove heat-exchanging loop, it is characterized in that, also has solar heat exchanger in the described water tank, the import of this heat exchange manifold is connected by pipeline with the export and import of the heating tube of solar thermal collector respectively with outlet, form the solar heat-exchange loop, external water circulating pump is installed on this loop; The import of the heating tube of described heating stove also is connected the export and import of radiator respectively with outlet, forms heating loop, on the heating tube pipeline of heating stove built-in circulating water pump is installed.
2, double-purpose apparatus for warming and heating water according to claim 1 is characterized in that, the pipeline that described heating stove heating tube outlet is connected with the import of described heating stove heat exchanger connects the pipeline that leads to the radiator import by triple valve; Described triple valve is used to switch heating stove heating circuit and heating loop.
3, double-purpose apparatus for warming and heating water according to claim 2 is characterized in that, described water tank top is equipped with expansion tank and hot water outlet pipe; The water tank bottom is equipped with running water inlet water pipe.
4, double-purpose apparatus for warming and heating water according to claim 2 is characterized in that, described water tank top is equipped with first temperature-sensing probe that detects the hot water temperature; The water tank bottom is equipped with second temperature-sensing probe that detects the water tank inflow temperature; Near on the pipeline position of the described solar thermal collector heating tube mouth of pipe, the 3rd temperature-sensing probe is installed.
5, double-purpose apparatus for warming and heating water according to claim 4 is characterized in that, described solar energy heating is equipped with hydraulic pressure switch and Pressure gauge on the loop.
6, double-purpose apparatus for warming and heating water according to claim 4 is characterized in that, near on the pipeline of the described solar thermal collector heating tube mouth of pipe, automatic exhaust steam valve is installed.
7, double-purpose apparatus for warming and heating water according to claim 4 is characterized in that, the heating stove that described heating stove heating circuit is adopted is gas heating stove or electric furnace; Described solar thermal collector is a flat type solar heat collector.
CN 200620009652 2006-09-04 2006-09-04 Heating and hot-water two-purpose device Expired - Lifetime CN200952781Y (en)

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Application Number Priority Date Filing Date Title
CN 200620009652 CN200952781Y (en) 2006-09-04 2006-09-04 Heating and hot-water two-purpose device

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Application Number Priority Date Filing Date Title
CN 200620009652 CN200952781Y (en) 2006-09-04 2006-09-04 Heating and hot-water two-purpose device

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101893274A (en) * 2009-05-21 2010-11-24 张家顺 Intelligent solar heating system
CN101970941A (en) * 2008-03-20 2011-02-09 大金工业株式会社 Heating and method for controlling the heating
CN102563965A (en) * 2012-01-06 2012-07-11 合肥通用机械研究院 High-precision heat exchanger with adjustable load
CN102032613B (en) * 2009-09-30 2013-05-01 中山市汉科科技有限公司 Dual-purpose water heating device capable of heating and heating water
CN103363572A (en) * 2013-08-01 2013-10-23 中天同圆太阳能高科技有限公司 Solar heating device
CN105509344A (en) * 2015-03-30 2016-04-20 银川艾尼工业科技开发有限公司 Solar heating oil way heat supply system
CN107965835A (en) * 2017-12-28 2018-04-27 吉林省大维科技发展有限公司 A kind of solar energy and burnt gas wall hanging furnace combine hot-water central heating system
CN110360637A (en) * 2018-03-26 2019-10-22 河北润普电器有限公司 Comprehensive heating system
CN110925852A (en) * 2019-11-12 2020-03-27 珠海格力电器股份有限公司 Control method of water heating unit and water heating unit

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101970941A (en) * 2008-03-20 2011-02-09 大金工业株式会社 Heating and method for controlling the heating
CN101970941B (en) * 2008-03-20 2013-08-07 大金工业株式会社 Heating system and method for controlling the heating system
CN101893274A (en) * 2009-05-21 2010-11-24 张家顺 Intelligent solar heating system
CN102032613B (en) * 2009-09-30 2013-05-01 中山市汉科科技有限公司 Dual-purpose water heating device capable of heating and heating water
CN102563965A (en) * 2012-01-06 2012-07-11 合肥通用机械研究院 High-precision heat exchanger with adjustable load
CN102563965B (en) * 2012-01-06 2014-04-09 合肥通用机械研究院 High-precision heat exchanger with adjustable load
CN103363572A (en) * 2013-08-01 2013-10-23 中天同圆太阳能高科技有限公司 Solar heating device
CN105509344A (en) * 2015-03-30 2016-04-20 银川艾尼工业科技开发有限公司 Solar heating oil way heat supply system
CN107965835A (en) * 2017-12-28 2018-04-27 吉林省大维科技发展有限公司 A kind of solar energy and burnt gas wall hanging furnace combine hot-water central heating system
CN110360637A (en) * 2018-03-26 2019-10-22 河北润普电器有限公司 Comprehensive heating system
CN110925852A (en) * 2019-11-12 2020-03-27 珠海格力电器股份有限公司 Control method of water heating unit and water heating unit
CN110925852B (en) * 2019-11-12 2020-11-13 珠海格力电器股份有限公司 Control method of water heating unit and water heating unit

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