CN113883590B - Flexible control method and system for solar heating - Google Patents

Abstract

The invention discloses a flexible control method and a system for solar heating, which are characterized in that the detected indoor temperature is introduced into a control strategy of a solar composite heating system through introducing the idea of indoor temperature tolerance fluctuation, the system can realize multiple modes of operation under the influence of weather conditions and building load changes, the solar composite heating system is formulated with a control scheme based on the principle of starting an air source heat pump unit as much as possible by preferentially utilizing solar energy or a water tank so as to make the heat collection, heat storage and heat supply of the system more reasonable, and the established system and the control strategy are simulated through TRNSYS software and compared with the traditional solar composite heating control system, so that the superiority of the proposed control strategy is proved.

Description

A flexible control method and system for solar heating

technical field

The invention belongs to the technical field of solar heating system control, and in particular relates to a flexible control method and system for solar heating.

Background technique

Solar energy is a renewable energy that exists everywhere. The use of solar energy to supply energy for buildings meets the requirements of sustainable development strategies and has been widely concerned by various countries. However, its inherent disadvantages such as low energy flow density, randomness and periodicity of energy supply, and the heating load of the building itself is a random quantity dependent on the change of meteorological parameters, which brings great challenges to the design of solar heating. obstacle. To solve the contradiction between solar radiation fluctuations and indoor thermal environment stability, it is necessary to reasonably set up heat storage and regulation devices; when single solar heating is used for heating, a large heat collection area is required, which will increase the initial investment cost of the system. These problems are all the key technical and economic barriers to adopting solar single heat source for heating.

The air source heat pump uses the low-grade air energy contained in the outdoors as the heat source (or heat sink), and converts a small amount of electric energy into high-grade heat energy for people to use. It has the advantages of high energy utilization efficiency, environmental protection and energy saving. Combined with the respective characteristics of solar heating and air source heat pump heating, the solar heating system uses the air source heat pump unit as an auxiliary heat source. On the one hand, in rainy days when solar energy cannot function, the air source heat pump can be used to supplement heating heat, which can overcome the discontinuity of solar energy , volatility shortcomings, while meeting the heat demand for heating, can effectively reduce conventional energy consumption; on the other hand, it can make up for the shortcomings of low heating performance of air source heat pumps caused by low outdoor ambient temperature.

At present, in some solar heating projects, the actual input ratio of auxiliary heat sources is often relatively large, and even plays a leading role. Solar energy fails to play its due role in heating, which leads to the current high initial investment and high operating costs of solar heating systems. No less, it is not dominant in clean heating, and it is one of the reasons why it is difficult to be widely promoted and applied by the public. The main reasons for the above problems are improper system control ideas and unreasonable optimization of heating output sequence. The original solar heat collection system is often used for the supply of domestic hot water. Simple constant temperature control and temperature difference control are suitable. There is a certain allowable fluctuation in the indoor temperature, so the solar heating system should be a flexible control strategy that gives priority to solar energy output and allows a certain fluctuation in the indoor temperature T0.

Contents of the invention

The technical problem to be solved by the present invention is to provide a flexible control method and system for solar heating to maximize the utilization of solar energy and reduce energy consumption of the system in view of the deficiencies in the above-mentioned prior art.

The present invention adopts following technical scheme:

A flexible control method for solar heating, which collects collector outlet hot water temperature T1, collector return hot water temperature T2, indoor temperature T0, and collector hot water temperature T3; according to collector outlet hot water temperature The difference between T1 and the return water temperature T2 of the collector, and the relationship between the temperature T3 of the hot water tank and the overheating temperature of the water tank, transfer the solar heat collected by the collector to the hot water tank, and realize the end of the heat collection cycle control;

Divide a day into daytime and nighttime, determine the temperature fluctuation space △T during daytime and nighttime, the lower limit of indoor comfortable temperature range during daytime is ST1-△T, the upper limit of indoor comfortable temperature range during daytime is ST1+△T, and the indoor comfortable temperature range The lower limit is ST2-△T, and the upper limit of the indoor comfortable temperature range at night is ST2+△T. According to the relationship between the hot water temperature T3 of the hot water tank and the indoor temperature T0 in the indoor comfortable temperature range, the switching control of water tank heating and air source heat pump heating is realized. .

Specifically, when the difference between the outlet temperature T1 of the collector and the return water temperature T2 of the collector reaches the start-up temperature difference and the hot water temperature T3 of the collector tank is lower than the overheating temperature of the collector tank, the solar collector circulation pump G1 is turned on; when the temperature difference reaches the stop temperature difference or the temperature of the hot water tank T3 is greater than the overheating temperature, the solar heat collection circulation pump G1 is turned off, and the heat collection cycle stops.

Specifically, when the time is in the daytime, if the hot water temperature T3 of the water collection tank is greater than the heating temperature of the water tank and the indoor temperature T0 is lower than the lower limit ST1-△T of the indoor comfortable temperature range required for the daytime, the heating circulation pump G2 is turned on and the valve E2, the valve E4 is opened, and the valve E3 is closed. At this time, the hot water of the hot water tank is used for circulating heating;

When the hot water temperature T3 of the collecting water tank is lower than the heating temperature of the water tank or the indoor temperature T0 is higher than the upper limit ST1+△T of the required indoor comfortable temperature range during the daytime, the valve E2 is closed and the water tank stops heating;

If the hot water temperature T3 of the collecting water tank is lower than the heating temperature of the water tank and the indoor temperature T0 is lower than the lower limit ST1-△T of the indoor comfortable temperature range required for daytime, the heating water pump G2 is turned on, the valve E2 is turned off, and the valves E3 and E4 are turned on. At this time, the heating cycle is performed by the air source heat pump.

Further, when the hot water temperature T3 of the collecting water tank is greater than the heating temperature of the water tank or the indoor temperature T0 is greater than the upper limit ST1+△T of the required indoor comfortable temperature range during the daytime, the valve E3 is closed, and the air source heat pump stops heating.

Further, when the indoor temperature T0 is greater than the upper limit ST1+ΔT of the required indoor comfortable temperature range during the daytime, the heating water pump G2 stops.

Specifically, when the time is at night, if the hot water temperature T3 of the collecting water tank is greater than the heating temperature of the water tank and the indoor temperature T0 is lower than the lower limit ST2-△T of the indoor comfortable temperature range required at night, the heating circulation pump G2 is turned on and the valves E2, The valve E4 is opened, and the valve E3 is closed. At this time, the hot water of the hot water tank is used for circulating heating;

When the hot water temperature T3 of the collecting water tank is lower than the heating temperature of the water tank or the indoor temperature T0 is higher than the upper limit ST2+△T of the indoor comfortable temperature range required at night, the valve E2 is closed and the water tank stops heating;

When the hot water temperature T3 of the collecting water tank is lower than the heating temperature of the water tank and the indoor temperature T0 is lower than the lower limit ST2-△T of the indoor comfortable temperature range required at night, the heating water pump G2 is turned on, the valve E2 is turned off, and the valves E3 and E4 are turned on. The heating cycle is performed by an air source heat pump.

Further, when the hot water temperature T3 of the collecting water tank is greater than the heating temperature of the water tank or the indoor temperature T0 is greater than the upper limit ST2+△T of the required indoor comfortable temperature range at night, the valve E3 is closed, and the air source heat pump stops heating.

Further, when the indoor temperature T0 is greater than the upper limit ST2+ΔT of the required indoor comfortable temperature range at night, the heating water pump G2 stops.

Another technical solution of the present invention is a flexible control system for solar heating, including a hot water tank, the water return port of the heat collector end of the hot water tank passes through the water tank return water temperature sensor, the solar heat collector, and the water outlet of the heat collector The temperature sensor, heat collecting circulation pump G1 and water tank inlet valve E1 return to the water inlet of the heat collecting end of the water collecting tank; the temperature sensor of the water tank is installed in the water collecting water tank and connected with the liquid level sensor L1; The water outlet of the heat supply end returns to the water return port of the heat supply end of the hot water tank through the water outlet valve E2 of the water tank, the heating valve E4, the heating circulation pump G2 and the radiator in turn; the outlet of the radiator passes through the air source heat pump and the air source heat pump outlet valve E3 is connected with the heating valve E4, and a temperature sensor is installed at the end of the room.

Compared with the prior art, the present invention has at least the following beneficial effects:

A solar heating flexible control method of the present invention, through real-time collection of indoor temperature, judges whether the room needs heating, in order to make the system heat collection, heat storage, and heat supply more reasonable, based on the principle of preferential use of solar energy, priority is given to the use of water tanks for heating, Secondly, the air source heat pump is used for heating, and the temperature of the room is controlled within a certain fluctuation range in two periods of the day and night, so as to meet the thermal comfort of the day and night and at the same time reduce the total energy consumption of the system. The requirements for comfortable temperature are also different. During the daytime, people need a higher indoor temperature to make the body feel thermally comfortable. In the sleep state at night, due to the use of related products such as bedding and electric blankets, the comfort value of the indoor temperature is higher than that during the daytime. It will be lowered, and the indoor comfortable temperature should not be a constant value, but a range; traditional constant temperature control, temperature difference control and other methods are more suitable for solar water heating systems, and for solar heating systems, it should be based on different time periods. Depending on the comfort temperature of the room, a certain range of indoor temperature T0 fluctuations is given to better utilize solar energy and reduce the start-up time of the heat pump, thereby reducing the total energy consumption of the system.

Furthermore, when the difference between the outlet temperature T1 of the solar collector and the return water temperature T2 at the collector end of the water tank reaches the start-up temperature difference, the collector collects sufficient solar energy at this time, and the temperature of the hot water in the collector and the collected heat The temperature difference of the hot water in the water tank is greater than the start-up temperature difference. At this time, the heat collector circulating pump is turned on to transport the hot water with high temperature in the heat collector to the The water performs heat exchange, and at the same time, the hot water at a lower temperature in the hot water tank is sent back to the collector through the return port of the heat collector end of the water tank for heating again, so as to make full use of the heat of solar energy to heat the hot water in the water tank to form heat exchange Circulation; and when the difference between the collector outlet temperature T1 and the return water temperature T2 at the collector end of the water tank is less than the stop temperature difference, the solar energy collected by the collector is insufficient at this time, and the collector cannot collect enough heat to heat hot water And conduct heat exchange with the hot water in the water tank, so turn off the heat collecting circulation pump, stop the heat exchange between the hot water in the heat collector and the hot water in the water collecting tank, wait until the heat collector collects enough solar energy and turn off the heat When the hot water in the heater is fully heated, start the heat collection cycle again.

Furthermore, firstly, it is judged whether the indoor temperature T0 is lower than the lower limit of the set daytime indoor comfortable temperature range. Room temperature, secondly, judge whether the temperature of the hot water in the water tank meets the heating temperature of the water tank. If the temperature T3 of the hot water in the water tank is greater than the heating temperature of the water tank, the heat of the hot water in the water tank is sufficient at this time, and only the heat in the water tank can be used. The water exchanges heat with the terminal radiator to provide heat for the room. If the temperature T3 of the hot water in the water tank is lower than the heating temperature of the water tank at this time, the heat of the hot water in the water tank is insufficient at this time, and the valve E2 should be closed to stop the heating of the water tank. Source heat pump heating; when it is judged that the indoor temperature T0 is greater than the upper limit of the indoor comfortable temperature range in the daytime, it means that the room temperature is too high at this time and there is no heating demand. At this time, the heating circulation pump G2 is turned off and the heating to the room is stopped.

Further, when the hot water temperature T3 of the collecting water tank is greater than the heating temperature of the water tank, the water tank reaches the heating condition at this time. In order to make full use of solar energy resources, if there is a heating demand in the room, the water tank is used for heating, and the air source heat pump is stopped for heating to reduce Energy consumption, and close the valve E3; if the indoor temperature T0 is greater than the upper limit of the indoor comfortable temperature range required during the daytime, the room temperature is too high and there is no heating demand, the air source heat pump heating should be stopped, and the valve E3 should be closed.

Further, when the indoor temperature T0 is greater than the upper limit of the required indoor comfortable temperature range during the daytime, the room temperature is too high and there is no heating demand, the heating circulation pump G2 should be turned off.

Further, firstly, it is judged whether the indoor temperature T0 is lower than the set lower limit of the indoor comfortable temperature range at night. When the indoor temperature is lower than the lower limit of the comfortable indoor temperature range at night, it means that the room temperature is too low at this time, and heating is required to increase the room temperature. , and secondly judge whether the temperature of the hot water in the water tank meets the heating temperature of the water tank. If the temperature T3 of the hot water in the water tank is greater than the heating temperature of the water tank, the heat of the hot water in the water tank is sufficient at this time, and only the hot water in the water tank and the heating temperature of the water tank can be used. The end radiator performs heat exchange to provide heat for the room. If the temperature T3 of the hot water in the water tank is lower than the heating temperature of the water tank at this time, the heat of the hot water in the water tank is insufficient at this time, the valve E2 should be closed, the heating of the water tank should be stopped, and an air source heat pump should be used. Heating; when it is judged that the indoor temperature T0 is greater than the upper limit of the indoor comfortable temperature range at night, it means that the room temperature is too high at this time, and there is no heating demand. At this time, the heating circulation pump G2 is turned off, and the heating to the room is stopped. .

Further, when the hot water temperature T3 of the collecting water tank is greater than the heating temperature of the water tank, the water tank reaches the heating condition at this time. In order to make full use of solar energy resources, if there is a heating demand in the room, the water tank is used for heating, and the air source heat pump is stopped for heating to reduce Energy consumption, and close the valve E3; if the indoor temperature T0 is greater than the upper limit of the indoor comfortable temperature range required at night, the room temperature is too high at this time, and there is no heating demand, the air source heat pump heating should be stopped, and the valve E3 should be closed.

Furthermore, when the indoor temperature T0 is greater than the upper limit of the required indoor comfortable temperature range at night, the room temperature is too high and there is no heating demand, the heating circulation pump G2 should be turned off.

The invention is a flexible control system for solar heating. The heat collector is responsible for collecting solar energy. According to the difference between the temperature sensor T1 of the outlet water of the heat collector and the temperature sensor T2 of the return water at the heat collecting end of the water tank, it is judged whether the heat storage condition is satisfied, and the The hot water is sent to the water inlet of the heat collecting end of the heat collecting tank through the heat collecting circulation pump G1 and the water inlet valve E1 of the water tank, and exchanges heat with the water in the water tank to heat the water in the water tank, and the temperature at the bottom of the heat collecting tank The lower water returns to the solar heat collector through the water return port of the heat collecting end of the water tank for heating, and is then sent to the heat collecting tank through the water inlet of the heat collecting end of the water tank again after heating to form a heat collecting and storing cycle. The water tank is provided with a temperature sensor T3 and a liquid level sensor L1. The temperature sensor T3 collects the current hot water temperature in the hot water tank in real time, which is used to judge whether the water temperature of the water tank is overheated and whether it meets the heating temperature of the water tank. Hydrate. A temperature sensor T0 is installed indoors to determine whether there is a heating demand in the current room. The heating side mainly includes the hot water tank, the air source heat pump, the heating circulation pump G2, the outlet valve E2 at the heating end of the water tank, the outlet valve E3 of the air source heat pump, the heating valve E4, and the radiator. If there is heating demand in the room, based on the purpose of using solar energy as much as possible at this time, that is, to use the water tank for heating as much as possible, and judge whether the current water temperature in the water tank reaches the water temperature available for heating in the water tank. If so, use the water tank for heating. The water outlet of the heating end of the tank is sent to the radiator through the water outlet valve E2 of the water tank, the heating valve E4, and the heating cycle G2, and the temperature of the room is raised through the radiator, and the low-temperature hot water after passing through the radiator is under the action of the heating circulation pump G2 Return to the water return port of the heating end of the water tank to form the heating cycle of the water tank; if the water temperature of the water tank does not meet the heating temperature of the water tank, the air source heat pump is turned on to heat the hot water, and the hot water passes through the outlet valve E3 of the air source heat pump and the heating valve E4 is sent to the radiator to heat up the room, and the low-temperature hot water flowing through the radiator returns to the air source heat pump to continue heating under the action of the heating circulation pump G2, and is sent to the radiator again to form the air source heat pump heating cycle.

To sum up, the present invention improves the control strategy of the solar composite heating system in combination with the idea that the indoor temperature T0 is allowed to fluctuate, so as to maximize the use of solar energy and reduce energy consumption.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is the frame diagram of solar energy-air source heat pump composite heating system of the present invention;

Fig. 2 is the schematic diagram of indoor temperature T0 tolerance fluctuation control of the present invention;

Fig. 3 is the control logic diagram of the heat storage side of the present invention

Fig. 4 is a control logic diagram of the heating side of the present invention;

Fig. 5 is the simulation interface diagram of TRNSYS;

Fig. 6 is a diagram of the indoor temperature simulation comparison results before and after the fluctuation of the indoor temperature T0;

Figure 7 is a graph of the comparison results of the system total energy consumption before and after the fluctuation of the indoor temperature T0;

Figure 8 is a graph showing the comparison results of the system solar guarantee rate before and after the indoor temperature T0 fluctuation.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "comprising" and "comprising" indicate the presence of described features, integers, steps, operations, elements and/or components, but do not exclude one or more other features, Presence or addition of wholes, steps, operations, elements, components and/or collections thereof.

It should also be understood that the terminology used in the description of the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the present invention. As used in this specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural referents unless the context clearly dictates otherwise.

It should also be further understood that the term "and/or" used in the description of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations .

Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. The figures are not drawn to scale, with certain details exaggerated and possibly omitted for clarity of presentation. The shapes of various regions and layers shown in the figure and their relative sizes and positional relationships are only exemplary, and may deviate due to manufacturing tolerances or technical limitations in practice, and those skilled in the art may Regions/layers with different shapes, sizes, and relative positions can be additionally designed as needed.

Please refer to Fig. 1, the present invention provides a kind of solar heating control system under indoor temperature T0 tolerance fluctuating demand, comprises solar heat collector, collecting water tank, air source heat pump, radiator, temperature sensor (heat collector outlet water temperature T1 , water tank return water temperature T2, water tank temperature T3, indoor temperature T0), liquid level sensor L1, collector circulation pump G1, heating circulation pump G2, water tank inlet valve E1, water tank outlet valve E2, air source heat pump outlet valve E3, Heating valve E4.

The temperature sensor T1 is connected to the outlet of the heat collector to collect the temperature of hot water at the outlet of the heat collector, and the temperature sensor T2 is connected to the water return port of the heat collector to collect the temperature of the hot water at the water return port of the heat collector. T3 is connected to the hot water tank to collect the temperature of hot water in the hot water tank, the temperature sensor T0 collects the indoor temperature, and the liquid level sensor L1 is connected to the hot water tank to collect the temperature of the hot water in the hot water tank. Liquid level height.

Please refer to Fig. 2, Fig. 3 and Fig. 4, a flexible control method for solar heating of the present invention, comprising the following steps:

S1. The sensor collects the outlet temperature of the heat collector, the return water temperature from the water tank to the heat collector, the indoor temperature, the temperature of the water collecting tank, and the liquid level of the water collecting tank;

S2. According to the data collected by the sensor, through the control logic set as follows, the day is divided into two control logics, daytime and nighttime, to control the valve and heat pump, as follows:

The sensor collects the hot water temperature T1 at the outlet of the solar collector, the hot water temperature T2 of the collector return water, and the hot water temperature T3 of the hot water tank in real time.

When the difference between the outlet temperature T1 of the solar collector and the return water temperature T2 reaches the start-up temperature difference and the temperature of the hot water tank T3 is lower than the anti-overheating temperature of the water tank, such as T1-T2>8°C and T3<90°C, the solar heat collection cycle pump G1 on;

When the temperature difference reaches the stop temperature difference or the temperature of the water tank is higher than the overheating prevention temperature, such as T1-T2<2°C or T3>90°C, the heat collection circulation pump G1 is turned off, and the heat collection cycle stops.

The sensor collects the hot water temperature T3 of the hot water tank and the indoor temperature T0 in real time, and divides the time of the day into daytime (8:00-18:00) and night (18:00-8:00) to set different heating start and stop temperatures Interval, according to the research literature of relevant scholars, it can be seen that the recommended thermoneutral comfortable temperature ST1 is about 16°C in the daytime in Northwest China, and the recommended thermoneutral comfortable temperature ST2 is about 12°C at night. In order to optimize the heating output sequence of water tanks and heat pumps and save For system energy consumption, a certain temperature fluctuation space △T is recommended for the thermoneutral comfortable temperature setting value during the daytime and nighttime, then the lower limit of the indoor comfortable temperature range during the daytime is ST1-△T, and the upper limit of the indoor comfortable temperature range during the daytime is ST1+△ T, the lower limit of the indoor comfortable temperature range at night is ST2-△T, and the upper limit of the indoor comfortable temperature range at night is ST2+△T.

When the time is in the daytime, if the hot water temperature T3 of the collecting water tank is greater than the heating temperature of the water tank and the indoor temperature T0 is lower than the lower limit ST1-△T of the required indoor comfortable temperature range during the daytime, such as T3>45°C and T0<15°C , the heating circulation pump G2 is turned on, valves E2 and E4 are turned on at the same time, and valve E3 is turned off. At this time, the hot water in the hot water tank is used for circulating heating;

When the hot water temperature T3 of the collecting water tank is less than the heating temperature of the water tank or the indoor temperature T0 is greater than the upper limit ST1+△T of the indoor comfortable temperature range required for daytime, such as T3<45°C or T0>17°C, the valve E2 is closed and the water tank stop heating;

If the hot water temperature T3 of the collecting water tank is lower than the heating temperature of the water tank and the indoor temperature T0 is lower than the lower limit ST1-△T of the indoor comfortable temperature range required for daytime, such as T3<45°C and T0<15°C, the heating water pump G2 is turned on, Valve E2 is closed, valve E3, and valve E4 are opened, and the heating cycle is performed by the air source heat pump at this time;

When the hot water temperature T3 of the collecting water tank is greater than the heating temperature of the water tank or the indoor temperature T0 is greater than the upper limit ST1+△T of the indoor comfortable temperature range required for daytime, such as T3>45°C or T0>17°C, the valve E3 is closed and the air The source heat pump stops heating;

If the indoor temperature T0 is greater than the upper limit ST1+△T of the required indoor comfortable temperature range during the daytime, such as T0>17°C, the heating water pump G2 will stop at this time.

When the time is at night, if the hot water temperature T3 of the collecting water tank is greater than the heating temperature of the water tank and the indoor temperature T0 is lower than the lower limit of the indoor comfortable temperature range ST2-△T required at night, if T3>45°C and T0<11°C, heating Circulating pump G2 is turned on, valves E2 and E4 are turned on, and valve E3 is turned off. At this time, the hot water in the hot water tank is used for circulating heating;

When the hot water temperature T3 of the collecting water tank is lower than the heating temperature of the water tank or the indoor temperature T0 is higher than the upper limit ST2+△T of the indoor comfortable temperature range required at night, such as T3<45°C or T0>13°C, the valve E2 is closed and the water tank stops heating;

If the hot water temperature T3 of the collecting water tank is lower than the heating temperature of the water tank and the indoor temperature T0 is lower than the lower limit ST2-△T of the indoor comfortable temperature range required at night, such as T3<45°C and T0<11°C, the heating water pump G2 is turned on and the valve E2 is closed, valve E3, and valve E4 are opened, and the heating cycle is performed by the air source heat pump at this time;

When the hot water temperature T3 of the collecting water tank is greater than the heating temperature of the water tank or the indoor temperature T0 is greater than the upper limit ST2+△T of the indoor comfortable temperature range required at night, such as T3>45°C or T0>13°C, the valve E3 is closed and the air source The heat pump stops heating;

If the indoor temperature T0 is greater than the upper limit ST2+△T of the required indoor comfortable temperature range at night, such as T0>13°C, the heating water pump G2 will stop at this time.

Please refer to Figure 5. Through the TRNSYS simulation software, a combined heating model of solar energy and air source heat pump is built, and the above-mentioned solar heating control method under the tolerance fluctuation demand of indoor temperature T0 is applied to the control system, and a room in Xi'an area is simulated heating;

Please refer to Fig. 6, Fig. 7 and Fig. 8. By applying a solar heating control method under the tolerance fluctuation demand of indoor temperature T0, the indoor temperature T0 of the room can fluctuate to a certain extent according to the set temperature range within a day. At the same time of comfort, the heating system using the control method can reduce the total energy consumption of the system by 28% compared with the traditional constant temperature heating control method, and the solar energy guarantee rate is improved in the heating month.

To sum up, the present invention provides a flexible control method and system for solar heating. By introducing the indoor temperature T0 tolerance fluctuation range into the control logic, the output sequence of the air source heat pump and water tank heating is optimized, thereby making full use of solar energy. Save system energy consumption.

The above content is only to illustrate the technical ideas of the present invention, and cannot limit the protection scope of the present invention. Any changes made on the basis of the technical solutions according to the technical ideas proposed in the present invention shall fall within the scope of the claims of the present invention. within the scope of protection.

Claims (2)

1. The flexible control method for solar heating is characterized by collecting the outlet hot water temperature T1 of the heat collector, the backwater hot water temperature T2 of the heat collector, the indoor temperature T0 and the hot water temperature T3 of the heat collector tank; according to the difference value of the outlet hot water temperature T1 of the heat collector and the return hot water temperature T2 of the heat collector and the relation between the hot water temperature T3 of the heat collecting water tank and the overheat prevention temperature of the water tank, the solar heat collected by the heat collector is transferred to the heat collecting water tank, so that the heat collecting circulation end control is realized;

dividing a day into daytime and nighttime, determining a daytime and nighttime temperature fluctuation space DeltaT, wherein the lower limit of a daytime indoor comfortable temperature interval is ST 1-DeltaT, the upper limit of a daytime indoor comfortable temperature interval is ST1 < + > DeltaT, the lower limit of a nighttime indoor comfortable temperature interval is ST 2-DeltaT, and the upper limit of a nighttime indoor comfortable temperature interval is ST2 < + > DeltaT; according to the relation between the hot water temperature T3 of the heat collection water tank and the indoor temperature T0 in an indoor comfortable temperature range, switching control of heating of the water tank and heating of the air source heat pump is realized;

when the difference between the outlet temperature T1 of the heat collector and the backwater hot water temperature T2 of the heat collector reaches the starting temperature difference and the hot water temperature T3 of the heat collecting water tank is smaller than the overheat preventing temperature of the heat collecting water tank, the solar heat collecting circulating pump G1 is started; when the temperature difference reaches a stop temperature difference or the hot water temperature T3 of the heat collecting water tank is larger than the overheat prevention temperature, the solar heat collecting circulating pump G1 is closed, and the heat collecting circulation is stopped;

when the time is in daytime, if the temperature T3 of the hot water in the heat collecting water tank is higher than the heatable temperature of the water tank and the indoor temperature T0 is lower than the lower limit ST 1-DeltaT of the indoor comfortable temperature interval required in the daytime, the heating circulating pump G2 is started, the valve E2 and the valve E4 are simultaneously opened, the valve E3 is closed, and at the moment, the hot water in the heat collecting water tank is used for circulating heating;

when the time is in daytime and the hot water temperature T3 of the heat collecting water tank is greater than the heatable temperature of the water tank or the indoor temperature T0 is greater than the upper limit ST1 < + > delta T of the indoor comfortable temperature interval required in the daytime, the valve E3 is closed, and the air source heat pump stops heating;

when the time is in daytime and the indoor temperature T0 is greater than the upper limit ST1 < + > delta T of the indoor comfort temperature interval required in daytime, the heating circulating pump G2 is stopped;

when the hot water temperature T3 of the heat collection water tank is smaller than the heatable temperature of the water tank or the indoor temperature T0 is larger than the upper limit ST1 < + > delta T of the indoor comfortable temperature interval required by daytime, the valve E2 is closed, and the water tank stops heating;

if the hot water temperature T3 of the heat collection water tank is smaller than the heatable temperature of the water tank and the indoor temperature T0 is smaller than the lower limit ST 1-DeltaT of the indoor comfortable temperature interval required in daytime, the heating circulating pump G2 is opened, the valve E2 is closed, the valve E3 and the valve E4 are opened, and at the moment, the air source heat pump is used for heating circulation;

when the time is at night, if the temperature T3 of the hot water in the heat collection water tank is higher than the heatable temperature of the water tank and the indoor temperature T0 is lower than the lower limit ST 2-DeltaT of the indoor comfortable temperature interval required at night, the heating circulating pump G2 is started, the valve E2 and the valve E4 are simultaneously opened, the valve E3 is closed, and at the moment, the hot water in the heat collection water tank is used for circulating heating;

when the time is at night and the hot water temperature T3 of the heat collection water tank is greater than the heatable temperature of the water tank or the indoor temperature T0 is greater than the upper limit ST < 2+ > delta T of the indoor comfortable temperature interval required at night, the valve E3 is closed, and the air source heat pump stops heating;

when the time is at night and the indoor temperature T0 is greater than the upper limit ST < 2+ > delta T of the indoor comfort temperature interval required at night, the heating circulating pump G2 is stopped;

when the hot water temperature T3 of the heat collection water tank is smaller than the heatable temperature of the water tank or the indoor temperature T0 is larger than the upper limit ST < 2+ > delta T of the indoor comfortable temperature interval required at night, the valve E2 is closed, and the water tank stops heating;

when the hot water temperature T3 of the heat collection water tank is smaller than the heatable temperature of the water tank and the indoor temperature T0 is smaller than the lower limit ST 2-DeltaT of the indoor comfortable temperature interval required at night, the heating circulating pump G2 is opened, the valve E2 is closed, the valve E3 and the valve E4 are opened, and the air source heat pump is used for heating circulation.

2. A flexible control system for solar heating by using the method of claim 1, which is characterized by comprising a heat collecting water tank, wherein a water return port of the heat collecting end of the heat collecting water tank returns to a water inlet of the heat collecting end of the heat collecting water tank through a water return temperature sensor of the water tank, a solar heat collector, a water outlet temperature sensor of the heat collector, a solar heat collecting circulating pump G1 and a water inlet valve E1 of the water tank; a water tank temperature sensor is arranged in the heat collection water tank and is connected with a liquid level sensor L1; the water outlet of the heat supply end of the heat collection water tank returns to the water return port of the heat supply end of the heat collection water tank through a water tank water outlet valve E2, a heating valve E4, a heating circulating pump G2 and a radiator in sequence; the outlet of the radiator is connected with a heating valve E4 through an air source heat pump and an air source heat pump water outlet valve E3, and the indoor tail end is provided with a temperature sensor.

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