CN104896567A - Multi-energy combined hot water system and control method - Google Patents
Multi-energy combined hot water system and control method Download PDFInfo
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- CN104896567A CN104896567A CN201510225375.2A CN201510225375A CN104896567A CN 104896567 A CN104896567 A CN 104896567A CN 201510225375 A CN201510225375 A CN 201510225375A CN 104896567 A CN104896567 A CN 104896567A
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Abstract
The invention provides a multi-energy combined hot water system and a control method. The hot water system adopts three heat sources including a heat collector, an air source heat pump and an electric heater for heating, and comprises a water tank temperature sensor, a heat collector temperature sensor and an air temperature sensor; the control method comprises the steps: if the temperature of a vacuum tube of the heat collector is higher than the water temperature of a water tank and a difference value is greater than a set heat collector and water tank temperature difference, the heat collector is started; if the water temperature of the water tank is lower than a set water tank water temperature, a water tank temperature rise curve does not meet a temperature rise requirement, and an air temperature is greater than an air source starting temperature, the air source heat pump is started; if the water tank water temperature is lower than the set water tank water temperature, the water tank temperature rise curve does not meet the temperature rise requirement, the electric heat is started; whether the three heat sources are started is judged in sequence, the start of the heat collector considers the influence of the heat collector receiving a natural energy source such as sunlight, and the start of the air source heat pump considers the influence of the air temperature, so that the system reaches effects of safe operation and energy conservation.
Description
Technical field
The present invention relates to technical field of solar water heaters, particularly a kind of multiple-energy-source combination hot-water heating system and control method.
Background technology
Solar water heater, as Green Product, is now accepted widely, and increasing family adopts solar water heater to provide hot water for life.But at rainy weather, solar water heater can not provide stable hot water, this situation brings very large inconvenience to user.
Stable hot water can be obtained to make user, current employing increases the mode of supplementary energy on solar water heater, it mainly contains following several mode: 1, solar energy and electrical heating combination, electrical heating is not by the restriction of other environmental factors, can start at any time, but efficiency is not high, generally to heats and could obtain available hot water in 4-6 hour, consume energy larger; 2, solar energy and Combined gas, gas heating speed is fast, but the connection at present between solar water heater and gas heater often adopts multiple hand-operated valve to change, and thus causes the inconvenience of use; 3, solar energy and heat pump combination, heat pump has efficient advantage, but conversion efficiency is lower.
Publication number is that the Chinese invention patent of CN103090456A discloses a kind of multiple-energy-source combination hot-water heating system and multiple-energy-source controls changing method, when user uses water heater in a large number, solar energy is started successively by system controller, heat pump, combustion gas and electrical heating, comfortable water body is provided to test to user fast, realize energy-saving effect, but to solar energy, heat pump, temperature rise curve in combustion gas and electrically heated startup Main Basis water tank, and take the mode that order is opened, whether each energy is opened completely according to client's design temperature, do not consider the actual service condition of solar energy, do not consider the impact of environment temperature factor, the relation of each energy and environment factor is not considered yet.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of security of operation rationally stable, and the multiple-energy-source of economize energy combination hot-water heating system and control method.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of multiple-energy-source combination hot-water heating system, comprises water tank, heat collector, air source heat pump, electric heater, water tank temperature sensor, heat collector temperature sensor, air temperature sensor, wherein
Described heat collector temperature sensor is used for detecting the temperature of heat collector vacuum tube;
Described air temperature sensor is used for detecting the temperature of air.
Beneficial effect of the present invention is: adopt heat collector, air source heat pump, electric heater as three kinds of supplying heat sources of hot-water heating system, by water tank temperature sensor, heat collector temperature sensor, air temperature sensor to hot-water heating system select in three kinds of supplying heat sources one or several foundation is provided, make hot-water heating system have energy-conservation effect.
A kind of multiple-energy-source combination hot-water heating system control method, described method is:
If S1 heat collector vacuum tube temperature is higher than water tank water temperature, and difference is greater than heat collector and the water tank temperature difference of setting, then heat collector is opened; Otherwise heat collector closes;
If S2 water tank water temperature is less than setting water tank temperature, then perform step S3; Otherwise, return step S1;
If S3 water tank temperature rise curve does not meet temperature increase requirement, then perform step S4; Otherwise, return step S1;
If S4 air themperature is greater than air-source open temp, then air source heat pump is opened; Otherwise air source heat pump closes;
If S5 water tank water temperature is less than setting water tank temperature, then perform step S6; Otherwise, return step S1;
If S6 water tank temperature rise curve does not meet temperature increase requirement, then electric heater leaves; Otherwise electric heater closes;
S7 returns step S1, repeats above-mentioned steps.
Beneficial effect of the present invention is: three kinds of supplying heat sources carry out condition judgment according to the opening sequence of heat collector, air source heat pump, electric heater successively, wherein the unlocking condition of heat collector is relevant with the difference of heat collector vacuum tube temperature and water tank water temperature, the unlocking condition of air source heat pump is relevant with the gentle air themperature of Water in Water Tank, electric heater is as the last supplying heat source for subsequent use selected, ensure the safe handling environment of heat collector, the unlatching of three kinds of supplying heat sources is coordinated and reaches preferably combined effect, reduce the energy consumption of hot-water heating system.
Accompanying drawing explanation
Fig. 1 is multiple-energy-source of the present invention combination hot-water heating system control method flow chart.
Detailed description of the invention
By describing technology contents of the present invention in detail, realized object and effect, accompanying drawing is coordinated to be explained below in conjunction with embodiment.
The design of most critical of the present invention is: adopt heat collector, air source heat pump, electric heater as three kinds of supplying heat sources of hot-water heating system, and the unlocking condition of three kinds of supplying heat sources considers respective energy-saving run feature, instead of consider water tank temperature and temperature rise curve merely, such as, heat collector opens the difference need considering heat collector vacuum tube temperature and water tank water temperature, air source heat pump is opened need consider air themperature, the unlatching of three kinds of supplying heat sources is coordinated and reaches energy-conservation effect, improve the security of system cloud gray model simultaneously.
Technical scheme of the present invention is:
A kind of multiple-energy-source combination hot-water heating system, comprises water tank, heat collector, air source heat pump, electric heater, water tank temperature sensor, heat collector temperature sensor, air temperature sensor, wherein
Described heat collector temperature sensor is used for detecting the temperature of heat collector vacuum tube;
Described air temperature sensor is used for detecting the temperature of air.
From foregoing description, beneficial effect of the present invention is: adopt heat collector, air source heat pump, electric heater as three kinds of supplying heat sources of hot-water heating system, and utilize water tank temperature sensor, heat collector temperature sensor, air temperature sensor to detect water tank water temperature, the temperature of heat collector vacuum tube, air themperature respectively, take into full account the heat supply feature of three kinds of supplying heat sources, to hot-water heating system select in three kinds of supplying heat sources one or several foundation is provided, make the energy consumption of three kinds of supplying heat sources obtain Appropriate application, make hot-water heating system have energy-conservation effect.
Please refer to Fig. 1, a kind of multiple-energy-source combination hot-water heating system control method, described method is:
If S1 heat collector vacuum tube temperature is higher than water tank water temperature, and difference is greater than heat collector and the water tank temperature difference of setting, then heat collector is opened; Otherwise heat collector closes;
If S2 water tank water temperature is less than setting water tank temperature, then perform step S3; Otherwise, return step S1;
If S3 water tank temperature rise curve does not meet temperature increase requirement, then perform step S4; Otherwise, return step S1;
If S4 air themperature is greater than air-source open temp, then air source heat pump is opened; Otherwise air source heat pump closes;
If S5 water tank water temperature is less than setting water tank temperature, then perform step S6; Otherwise, return step S1;
If S6 water tank temperature rise curve does not meet temperature increase requirement, then electric heater leaves; Otherwise electric heater closes;
S7 returns step S1, repeats above-mentioned steps.
From foregoing description, beneficial effect of the present invention is: three kinds of supplying heat sources carry out condition judgment according to the opening sequence of heat collector, air source heat pump, electric heater successively, the condition that wherein heat collector is opened only considers the difference of heat collector vacuum tube temperature and water tank water temperature, do not consider merely whether water tank water temperature reaches setting water tank temperature, when making heat collector vacuum tube temperature reach certain value, namely heat collector carries out water circulation with water tank, prevent temperature in heat collector too high, damage heat collector, ensure the security of system cloud gray model; The condition that air source heat pump is opened needs to consider water tank water temperature, water tank temperature rise curve simultaneously, and whether air themperature is greater than air-source open temp, during air source heat pump work, need that air is carried out compressing and converting and become heat energy, when air themperature is lower than certain value, the energy conversion rate of air source heat pump is lower, and observable index is comparatively large, and power consumption is larger; Electric heater is as the last supplying heat source for subsequent use selected, consume the maximum supplying heat source of energy consumption in three kinds of supplying heat sources, but there is the quick and direct feature of heating, the natural energy resources used when heat collector can not provide enough heating loads, and air themperature is lower, cause the energy conversion rate of air source heat pump lower, when observable index is larger, opening electric heater is also reasonable selection.
Further, described setting water tank temperature is the target water temperature of water tank, and number range is 40 ~ 80 DEG C.
Seen from the above description, setting water tank temperature can be arranged in 40 ~ 80 DEG C of number ranges by user as required, and 40 ~ 80 DEG C of conventional temperature ranges being user and using hot water, meet the use habit of user.
Further, the heat collector of described setting and the water tank temperature difference are the numerical value of temperature higher than water tank water temperature of heat collector vacuum tube, and number range is 5 ~ 50 DEG C.
Seen from the above description, heat collector and the water tank temperature difference of setting are related to the condition of carrying out water circulation between heat collector and water tank, what heat collector mainly utilized is this natural energy resources of solar energy, temperature arranges too high, energy in heat collector can be caused can not to transfer to water tank in time, and cause other supplying heat sources to be opened, cause the waste of electric energy; Temperature arranges too low, heat collector and Water in Water Tank can be caused to circulate too frequent, be unfavorable for the rising of water temperature in heat collector, cause the waste of electric energy simultaneously.In winter, when the temperature rise of heat collector vacuum tube is slower, the heat collector of setting and the water tank temperature difference can be set to 5 ~ 20 DEG C, in time by the delivered heat that gathers in vacuum tube in water tank; In summer, the heat collector of setting and the water tank temperature difference, faster in situation, can be set to 20 ~ 50 DEG C, prevent water circulation between heat collector and water tank from frequently opening, cause the waste of electric energy by the temperature rise of heat collector vacuum tube.
Further, described air-source open temp is the environment temperature critical value that air source heat pump is opened, and numerical value is-5 DEG C.
Air source heat pump heating energy efficiency ratio is at different ambient temperatures in table 1:
Table 1
| Environment temperature (DEG C) | -5 | 0 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 |
| Heating energy efficiency ratio (COP) | 1.5 | 2.2 | 2.7 | 3.3 | 3.7 | 4.1 | 4.2 | 4.4 | 4.6 | 4.7 |
As shown in Table 1, environment temperature is lower, and the heating energy efficiency ratio (COP) of air source heat pump is lower, and energy consumption is higher.
In addition, under operating mode, the hot and cold water temperature difference is 51 DEG C, and when environment temperature is 20 DEG C, the heating capacity of air source heat pump is 17.2KW; When environment temperature is 5 DEG C, the heating capacity of air source heat pump is 11.23KW, and heating capacity during than 20 DEG C reduces about 1/3; When environment temperature is-5 DEG C, the heating capacity of air source heat pump is 5.75KW, and heating capacity during than 20 DEG C reduces about 2/3.
Seen from the above description, air-source open temp is related to the condition of carrying out water circulation between air source heat pump and water tank, the energy consumption of air source heat pump is between heat collector and electric heater, but air source heat pump is that air is carried out the heat supply of compression feed-tank, during operation by amblent air temperature hot affect larger, along with the reduction of outdoor temperature, evaporating temperature constantly reduces, compression ratio constantly increases, displacement reduces, and along with evaporating temperature reduction, cold-producing medium evaporates the latent heat of vaporization absorbed and is also reducing, compression ratio increases simultaneously, delivery temperature raises, the heating load of unit reduces gradually, COP value constantly reduces, compressor at high temperature runs for a long time simultaneously, very unfavorable.When environment temperature is lower than-5 DEG C, the COP of air source heat pump is less than 1.5, and the energy conversion rate opening air source heat pump is lower, and energy input is larger, below this temperature, can not start the thermal source of air source heat pump as heating system.
Please refer to Fig. 1, embodiments of the invention one are:
A kind of multiple-energy-source combination hot-water heating system, comprises water tank, heat collector, air source heat pump, electric heater, water tank temperature sensor, heat collector temperature sensor, air temperature sensor, wherein
Described heat collector temperature sensor is used for detecting the water temperature in heat collector supply line;
Described air temperature sensor is used for detecting the temperature of air.
Please refer to Fig. 1, a kind of multiple-energy-source combination hot-water heating system control method, fine day, the highest temperature of whole day is 15 DEG C, and the lowest temperature is-10 DEG C, supposes that setting water tank temperature is 70 DEG C, heat collector and the water tank temperature difference of setting are 5 DEG C, and air-source open temp is-5 DEG C, and described method is:
If S1 heat collector vacuum tube temperature is higher than water tank water temperature, and difference is greater than 5 DEG C, then heat collector is opened; Otherwise heat collector closes;
If S2 water tank water temperature is less than 70 DEG C, then perform step S3; Otherwise, return step S1;
If S3 water tank temperature rise curve does not meet temperature increase requirement, then perform step S4; Otherwise, return step S1;
If S4 air themperature is greater than-5 DEG C, then air source heat pump is opened; Otherwise air source heat pump closes;
If S5 water tank water temperature is less than setting water tank temperature, then perform step S6; Otherwise, return step S1;
If S6 water tank temperature rise curve does not meet temperature increase requirement, then electric heater leaves; Otherwise electric heater closes;
S7 returns step S1, repeats above-mentioned steps.
In actual moving process, 8:00-18:00, because solar energy is sufficient, heat collector is as main supplying heat source, and air source heat pump is as auxiliary heat supplying source; At 5:00-8:00 and 18:00-23:00, because solar energy is more weak, and air themperature is higher than-5 DEG C, and air source heat pump is as main supplying heat source, and heat collector and electric heater are as auxiliary thermal source; At 23:00-5:00, owing to not having solar energy, and air themperature is lower than-5 DEG C, and electric heater is as main supplying heat source, and air source heat pump is not opened, and heat collector is as auxiliary heat supplying source.
In sum, multiple-energy-source combination hot-water heating system provided by the invention and control method, adopt heat collector, air source heat pump, electric heater as three kinds of supplying heat sources of hot-water heating system, and utilize water tank temperature sensor, heat collector temperature sensor, air temperature sensor to detect water temperature, air themperature in water tank water temperature, heat collector feed pipe respectively; Three kinds of supplying heat sources carry out condition judgment according to the opening sequence of heat collector, air source heat pump, electric heater successively, the condition that wherein heat collector is opened is not consider merely whether water tank water temperature reaches setting water tank temperature, but when considering that the difference of heat collector vacuum tube temperature and water tank water temperature reaches certain value, namely heat collector carries out water circulation with water tank, prevent temperature in heat collector too high, damage heat collector, ensure the security of system cloud gray model; During air source heat pump work, need that air is carried out compressing and converting and become heat energy, the condition of unlatching needs to consider water tank water temperature, water tank temperature rise curve simultaneously, and whether air themperature is greater than air-source open temp; Electric heater is as the last supplying heat source for subsequent use selected, consume the maximum supplying heat source of energy consumption in three kinds of supplying heat sources, but there is quick, the direct feature of heating, described hot-water heating system security of operation is stablized, and according to three kinds of supplying heat sources separately energy consumption feature judge whether open, there is raising energy utilization rate, the effect of economize energy.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalents utilizing description of the present invention and accompanying drawing content to do, or be directly or indirectly used in relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (5)
1. a multiple-energy-source combination hot-water heating system, comprises water tank, heat collector, air source heat pump, electric heater, water tank temperature sensor, it is characterized in that, also comprise heat collector temperature sensor, air temperature sensor, wherein
Described heat collector temperature sensor is used for detecting the temperature of heat collector vacuum tube;
Described air temperature sensor is used for detecting the temperature of air.
2. a multiple-energy-source combination hot-water heating system control method, it is characterized in that, described method is:
If S1 heat collector vacuum tube temperature is higher than water tank water temperature, and difference is greater than heat collector and the water tank temperature difference of setting, then heat collector is opened; Otherwise heat collector closes;
If S2 water tank water temperature is less than setting water tank temperature, then perform step S3; Otherwise, return step S1;
If S3 water tank temperature rise curve does not meet temperature increase requirement, then perform step S4; Otherwise, return step S1;
If S4 air themperature is greater than air-source open temp, then air source heat pump is opened; Otherwise air source heat pump closes;
If S5 water tank water temperature is less than setting water tank temperature, then perform step S6; Otherwise, return step S1;
If S6 water tank temperature rise curve does not meet temperature increase requirement, then electric heater leaves; Otherwise electric heater closes;
S7 returns step S1, repeats above-mentioned steps.
3. multiple-energy-source combination hot-water heating system control method according to claim 2, it is characterized in that, described setting water tank temperature is the target water temperature of water tank, and number range is 40 ~ 80 DEG C.
4. multiple-energy-source combination hot-water heating system control method according to claim 2, it is characterized in that, the heat collector of described setting and the water tank temperature difference are the numerical value of temperature higher than water tank water temperature of heat collector vacuum tube, and number range is 5 ~ 50 DEG C.
5. multiple-energy-source combination hot-water heating system control method according to claim 2, it is characterized in that, described air-source open temp is the environment temperature critical value that air source heat pump is opened, and numerical value is-5 DEG C.
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| CN112413701A (en) * | 2020-10-26 | 2021-02-26 | 青岛理工大学 | Air source heat pump auxiliary electric heating grading control system and control method |
| CN113983544A (en) * | 2021-10-25 | 2022-01-28 | 珠海格力电器股份有限公司 | Operation control method and system and solar heat pump hot water system |
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