CN106610068B - Solar airconditioning and phase-change accumulation energy integral system and its working method - Google Patents

Abstract

The invention discloses an integrated system of solar air conditioner and phase change energy storage. By integrating and controlling the connection of solar air conditioner and backup system (heat pump cooling and heating machine), seamless switching between solar energy and electric energy is realized, and it has two operating modes: summer In cooling mode and winter heating mode, during the operation of the system, solar energy is given priority to use, and when solar energy is not enough to provide stable and continuous energy, the heat pump air conditioner as a backup system can make up for this deficiency, effectively reducing the startup frequency of the backup system At the same time as the running time, the operation of the whole system is more energy-saving. In addition, through the phase change hot water storage tank, the automatic heat storage and heat release function of the phase change material can be realized, thereby effectively preventing the first circulation pipeline from overheating; the solar energy provided by the invention The integrated system of air conditioning and phase change energy storage, which combines phase change energy storage technology with solar air conditioning technology, is an innovation in the development of air conditioning technology and will promote the large-scale promotion of solar air conditioning systems.

Description

Solar air conditioning and phase change energy storage integrated system and its working method

technical field

The invention relates to the technical field of solar air conditioning and phase change energy storage, in particular to an integrated system of solar air conditioning and phase change energy storage and a working method thereof.

Background technique

The solar absorption air-conditioning system uses solar energy as the main energy source to provide the hot water required by the generator for the heat-driven refrigerator, so as to achieve the purpose of cooling. In the case of no need for cooling in winter, the hot water heated by solar energy can directly provide heating for users or provide domestic hot water, realizing the integration of solar heating and cooling air conditioners and water heaters. Although solar air-conditioning technology has the outstanding advantages of energy saving and environmental protection, however, there are still the following problems in the promotion process of solar air-conditioning systems:

(1) The stable operation of solar air conditioners usually requires the configuration of heat storage tanks and cold storage tanks. The storage medium currently used is water. However, the use of water storage tanks generally has the following disadvantages: first, the volume of the water storage tank is huge; second, the safety setting of the tank body of the water storage tank, such as the high-temperature and high-pressure heat storage tank usually installed on the water inlet side, there is a certain risk; In order to prevent the water temperature from dropping rapidly, the insulation requirements for the tank body of the water storage tank are very high.

(2) Solar energy resources are volatile, which affects the continuity of solar air conditioner operation. When the solar radiation is very high, limited by the volume of the heat storage tank, the system cannot fully store excess solar energy resources; when there is a sudden increase in user load or continuous rainy days, relying on the solar energy system alone cannot meet customer needs. At this time, it is necessary to frequently start the auxiliary system , increasing energy consumption.

(3) The cooling efficiency of solar air conditioners depends on the input temperature of hot water. The higher the temperature of the input hot water, the better the cooling effect of the unit. At present, the common problems of water storage tanks are: first, the water temperature will appear stratification phenomenon, which cannot maintain the stable temperature of the unit, resulting in unstable operation of the refrigerator; second, water belongs to sensible heat storage, and its stored energy and energy released It is directly proportional to the temperature range of energy. The lower the energy storage temperature, the lower its energy storage. When the water temperature is lower than the minimum rated water inlet temperature of the refrigerator, the hot water at this temperature cannot be used, resulting in a large amount of residual heat and energy waste.

It can be seen from the above that there are certain technical bottlenecks in the current solar air-conditioning system. In order to solve this problem, the present invention proposes an integrated system of solar air conditioner and phase change energy storage and its working method.

Contents of the invention

The technical problem to be solved by the present invention is to provide an integrated system of solar air conditioner and phase change energy storage and its working method in view of the deficiencies of the prior art. , to realize the seamless switching between solar energy and electric energy. During the operation of the system, solar energy is given priority to use. When solar energy is not enough to provide stable and continuous energy, the heat pump air conditioner as a backup system can make up for this deficiency, effectively reducing the backup While improving the system startup frequency and running time, the whole system runs more energy-efficient.

The technical solution adopted by the present invention to solve the above technical problems is: an integrated system of solar air conditioning and phase change energy storage, including a solar heat collection unit, a phase change heat storage tank, a cooling unit, a buffer water tank and a fan coil unit, The solar heat collection unit is connected to the hot water storage tank through the first circulation pipeline, and the heat storage coil is installed in the hot water storage tank, and the hot water storage tank is connected to the hot water storage tank through the second circulation pipe. The road is connected to the phase-change hot water storage tank, and the phase-change hot water storage tank stores phase-change materials. The cooling unit includes a cooling tower and a lithium bromide refrigeration unit. The cooling tower passes through the first The three-circulation pipeline is connected to the lithium bromide refrigeration unit, the hot water storage tank is connected to the lithium bromide refrigeration unit through the fourth circulation pipeline, and the hot water storage tank is connected to the lithium bromide refrigeration unit through the fifth circulation pipeline. The buffer water tank mentioned above is connected, and there is a common pipeline between the fourth circulation pipeline and the fifth circulation pipeline, and the common pipeline is connected to the hot water storage tank, and the lithium bromide refrigeration The unit is connected to the buffer water tank through the sixth circulation pipeline, and the buffer water tank is connected to the fan coil unit through the seventh circulation pipeline. The first circulation pipeline with frequency conversion is installed on the first circulation pipeline Pump P1, the second circulation pump P2 is set on the fourth circulation line, P2 is located on the fifth circulation line at the same time, the third circulation pump P3 is set on the sixth circulation line, the The fourth circulation pump P4 is set on the seventh circulation line, the fifth circulation pump P5 is set on the third circulation line, the sixth circulation pump P6 is set on the second circulation line, and the first circulation pump P6 is set on the first circulation line. A number of temperature sensors and valves are arranged on the circulation pipeline, the second circulation pipeline, the third circulation pipeline, the fourth circulation pipeline, the fifth circulation pipeline, the sixth circulation pipeline and the seventh circulation pipeline respectively. During cooling, the solar collector unit provides hot water to the lithium bromide refrigeration unit, the lithium bromide refrigeration unit provides chilled water to the buffer water tank, and the buffer water tank provides chilled water to the fan coil unit; when heating in winter, the solar collector unit supplies the buffer water tank Hot water, the buffer water tank provides the hot water required for heating to the fan coil unit.

Preferably, it also includes a heat pump cooling and heating machine, the buffer water tank is connected with the heat pump cooling and heating machine through the eighth circulation pipeline, and the seventh circulation pump, several temperature sensors and several valves are arranged on the eighth circulation pipeline .

Preferably, the melting point of the phase change material is 75-95°C.

As a preference, an electric three-way valve S1 and an air-cooled radiator are arranged on the first circulation pipeline, and the solar heat collection unit is connected to the hot water storage tank and the heat storage tank through the electric three-way valve S1 respectively. The air-cooled radiators are connected.

Preferably, the solar heat collection unit includes a first solar collector group and a second solar collector group connected in parallel, and a temperature sensor T1 is installed on the outlet pipe of the first solar collector group, A temperature sensor T2 is installed on the water outlet pipeline of the second solar collector group, and the water outlet pipeline of the first solar collector group is connected to the water outlet pipeline of the second solar collector group. A temperature sensor T3 is installed at the confluence, and the outlet pipeline of the first solar collector group and the outlet pipeline of the second solar collector group merge with the outlet pipeline of the second solar collector group respectively through the electric three-way valve S1. The hot water storage tank communicates with the air-cooled radiator, a flow sensor F1 and a ball valve V1 are installed between S1 and the hot water storage tank, and a first expansion valve is installed between P1 and the hot water storage tank. A gate valve V20 is installed between the tank, the first decompression valve J1 and the ball valve V2, S1 and the air-cooled radiator, and the water outlet pipeline of the air-cooled radiator is connected to the first circulation pipeline, A gate valve V19 is installed on the water outlet pipeline of the air-cooled radiator, and a temperature sensor T6 is installed between P1 and the water inlet pipelines of the first solar collector group and the second solar collector group and temperature sensor T7, temperature sensors T4 and T5 are installed on the hot water storage tank, a ball valve V17 is installed at the water inlet of the phase change hot water storage tank, and a ball valve V17 is installed at the outlet of the phase change hot water storage tank A ball valve V18 is installed at the water outlet, temperature sensors T18 and T19 are installed on the phase-change hot water storage tank, P2 and a ball valve V3 are sequentially installed on the water supply pipeline from the hot water storage tank to the lithium bromide refrigeration unit , the lithium bromide refrigeration unit is sequentially installed with a temperature sensor T9 and a ball valve V4 on the return water pipeline of the hot water storage tank, and one end of V3 and V4 close to the lithium bromide refrigeration unit is respectively connected to the electric three-way valve S2 , S2 is connected with the lithium bromide refrigeration unit at the same time, P2, the second expansion tank, the second pressure reducing valve J2 and the flow sensor F2 are installed on the common pipeline of the fourth circulation pipeline and the fifth circulation pipeline, The fifth circulation line is provided with a ball valve V7, a ball valve V8 and a third pressure reducing valve J3, and the sixth circulation line is provided with a temperature sensor T11, a temperature sensor T10, a ball valve V5 and a ball valve V6, T10 and T11 Close to the lithium bromide refrigeration unit, temperature sensors T14 and T15 are installed on the buffer water tank, and temperature sensors T12, temperature sensor T13, ball valve V11 and ball valve V12 are arranged on the third circulation pipeline, and T12 and T13 are close to In the lithium bromide refrigerating unit, a temperature sensor T16, a temperature sensor T17, a flow sensor F3, a ball valve V9 and a ball valve V10 are arranged on the seventh circulation pipeline, and a ball valve V13 and a ball valve V15 are arranged on the eighth circulation pipeline. And ball valve V14, ball valve V16.

The working method of the above solar air conditioner and phase change energy storage integrated system includes the following steps:

When cooling in summer:

V1, V2, V3, V4, V5, V6, V9～V20 open, V7, V8 close;

When T1 or T2≥85°C, P1 is turned on, the solar collector unit works, and the system enters the heat collection cycle mode; after P1 is turned on and runs for 10 minutes, if T1 and T2<85°C, then P1 stops, or, P1 turns on and runs Within 10 minutes, if T1 and T2<80°C, then P1 stops, and the heat collection cycle mode stops;

When T4>90°C and T4-T18≥4°C, P6 is turned on and the phase change heat storage tank starts to store heat; when T4≤88°C or T4-T18<2°C, P6 stops and the phase change heat storage The water tank stops heat storage; when T4≤75°C and T18-T4≥6°C, then P6 is turned on, and the phase change heat storage tank starts to release heat; when T4>80°C or T18-T4<2°C, then P6 stop, the phase change heat storage tank stops releasing heat;

When T4≥95°C or T3≥110°C, S1 switches to the air-cooled radiator path, and at the same time the air-cooled radiator is turned on, and the system turns on the high temperature protection mode; when T4<93°C or T3<105°C, S1 switches to the second The first circulation pipeline, at the same time the air-cooled radiator is closed, and the high temperature protection mode is stopped;

When T4≥80°C, P2 starts, and when the generator temperature of the lithium bromide refrigeration unit is ≥63°C, the lithium bromide refrigeration unit is turned on, P3, P5 and P4 are turned on, the cooling unit and the fan coil work, and the solar heat collection unit supplies lithium bromide The refrigerating unit provides hot water, the lithium bromide refrigerating unit provides chilled water to the buffer water tank, and the buffer water tank supplies chilled water to the fan coil, and the system starts the refrigeration cycle mode; when T4<70°C, or, T15>18°C and the fan coil When the tube starts, the cooling unit stops working, the heat pump air conditioner starts, P7 turns on, the heat pump air conditioner supplies cooling to the fan coil, and the fan coil cools; when T15≤15°C or the fan coil stops, P7 stops, and the heat pump cools. machine stops working;

When heating in winter:

V1, V2, V7, V8, V9, V10, V13～V20 open, V3, V4, V5, V6, V11, V12 close;

When T1 or T2≥50°C, P1 is turned on, the solar collector unit works, and the system enters the heat collection cycle mode; after P1 is turned on and runs for 10 minutes, if T1 and T2<50°C, then P1 stops, or, P1 turns on and runs Within 10 minutes, if T1 and T2<45°C, then P1 stops, and the heat collection cycle mode stops;

When T4>60°C and T4-T18≥4°C, P6 is turned on, and the phase change heat storage tank starts to store heat; when T4≤58°C or T4-T18<2°C, P6 stops, and the phase change heat storage The water tank stops heat storage; when T4≤55°C and T18-T4≥4°C, then P6 is turned on, and the phase change heat storage tank starts to release heat; when T4>58°C or T18-T4<2°C, then P6 stop, the phase change heat storage tank stops releasing heat;

When T4>62°C or T3>90°C, S1 switches to the air-cooled radiator path, and at the same time the air-cooled radiator is turned on, and the system starts the high temperature protection mode; when T4≤60°C or T3≤88°C, S1 switches to the second The first circulation pipeline, at the same time the air-cooled radiator is closed, and the high temperature protection mode is stopped;

When T7<2°C, P1 is turned on, S1 is switched to the air-cooled radiator circuit, the air-cooled radiator is turned off, and the system enters the antifreeze cycle mode; when T7≥6°C, P1 is stopped, S1 is switched to the first cycle circuit, Antifreeze cycle mode stops;

When T15<55°C and T4-T15≥2°C, P2, P4 and the fan coil unit start, the system enters the heat exchange cycle mode, the solar collector unit provides hot water to the buffer water tank, and the buffer water tank provides heating to the fan coil unit When hot water is needed, the system turns on the heating mode; when T15<45°C and the fan coil unit starts, the heat pump air conditioner starts, P7 is turned on, the heat pump air conditioner supplies heat to the fan coil unit, and the fan coil unit provides heating; when T15≥50°C or the fan coil unit When the coil stops, P7 stops, and the heat pump cooling and heating machine stops working.

As a preference, when the water pressure of the first circulation pipeline measured by the first expansion tank is <1.5MPa, tap water will replenish water to the first circulation pipeline through the first decompression valve J1; when the first expansion tank measures the water pressure of the first circulation pipeline When the water pressure of the pipeline is ≥2.0MPa, the first pressure reducing valve J1 is closed; when the water pressure of the fourth or fifth circulation pipeline measured by the second expansion tank is less than 1.5MPa, tap water passes through the second pressure reducing valve J2 supplies water to the fourth circulation pipeline or the fifth circulation pipeline; when the water pressure of the fourth circulation pipeline or the fifth circulation pipeline measured by the second expansion tank is ≥2.0MPa, the second pressure reducing valve J2 is closed.

As a preference, when T1-T2>5°C or T3>110°C, the first circulation pipeline alarms; when T4>95°C in the summer refrigeration cycle mode, the hot water storage tank alarms; when in the winter heat exchange cycle mode , When T4>62°C, the hot water storage tank will alarm.

Compared with the prior art, the present invention has the following advantages: 1. The integrated solar air conditioner and phase change energy storage system provided by the present invention combines phase change energy storage technology with solar air conditioner technology, which is a breakthrough in the development of air conditioner technology. Innovation will promote the large-scale promotion of solar air-conditioning systems. 2. Compared with traditional sensible heat energy storage media (such as water, brine, etc.), phase change energy storage materials have the outstanding advantages of high energy storage density and small temperature change. The invention applies the phase change energy storage technology to the heat storage end and cold storage end of the solar air conditioning system, which can solve the intermittent and unstable characteristics of solar energy, store the excess solar energy during the day (or sunny day), and store it at night (or cloudy and rainy) day) to release energy to realize the continuity of solar energy utilization; at the same time, within the same temperature range, the energy storage density of phase change materials is 5 to 12 times that of water. Therefore, the solar air conditioner and phase change energy storage integrated system of the present invention , in the case of the same energy storage capacity, the volume of the existing water storage tank can be greatly reduced, saving user space; and the temperature of the phase change energy storage material remains constant during the energy storage process, or changes little The phase-change energy storage technology is adopted at the hot end, which can stabilize the temperature of hot water at the inlet of the refrigerator, and significantly improve the operating efficiency of the system. The phase-change energy storage technology is adopted at the cold storage end, which can stabilize the temperature of the chilled water and improve user comfort. 3. The solar air conditioner and phase change energy storage integrated system of the present invention has two operating modes: summer cooling mode and winter heating mode, which realizes solar energy and Seamless switching of electric energy. During the operation of the system, solar energy is given priority to use. When solar energy is not enough to provide stable and continuous energy, the heat pump cooling and heating machine as a backup system can make up for this deficiency, effectively reducing the startup frequency of the backup system and At the same time, the operation of the whole system is more energy-efficient. In addition, through the phase change hot water storage tank, the automatic heat storage and heat release function of the phase change material can be realized, thereby effectively preventing the first circulation pipeline from overheating.

Description of drawings

Fig. 1 is a schematic structural diagram of an integrated system of solar air conditioning and phase change energy storage in an embodiment.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

The integrated solar air conditioner and phase change energy storage system of the embodiment, as shown in Figure 1, includes a solar heat collection unit 1, a phase change water storage tank 2, a cooling unit, a buffer water tank 4, a fan coil unit 5 and a heat pump for heating and cooling machine 6, the solar heat collection unit 1 is connected to the hot water storage tank 7 through the first circulation pipeline 81, the heat storage coil 71 is installed in the hot water storage tank 7, and the hot water storage tank 7 is connected to the hot water storage tank 7 through the second circulation pipeline 82 The phase change heat storage tank 2 is connected, and the phase change heat storage tank 2 stores phase change materials. The cooling unit includes a cooling tower 32 and a lithium bromide refrigeration unit 31. The cooling tower 32 communicates with the lithium bromide refrigeration unit through a third circulation pipeline 83. 31, the hot water storage tank 7 is connected to the lithium bromide refrigeration unit 31 through the fourth circulation pipeline 84, the hot water storage tank 7 is connected to the buffer water tank 4 through the fifth circulation pipeline 85, and the fourth circulation pipeline 84 is connected to the fifth circulation pipeline There is a common pipeline between the pipelines 85, which is connected to the hot water storage tank 7, and the lithium bromide refrigeration unit 31 is connected to the buffer water tank 4 through the sixth circulation pipeline 86, and the buffer water tank 4 passes through the seventh circulation pipeline 87 Connected to the fan coil unit 5, the first circulation pipeline 81 is provided with a frequency-variable first circulation pump P1, the fourth circulation pipeline 84 is provided with a second circulation pump P2, and P2 is located on the fifth circulation pipeline 85 at the same time. The sixth circulation pipeline 86 is provided with a third circulation pump P3, the seventh circulation pipeline 87 is provided with a fourth circulation pump P4, the third circulation pipeline 83 is provided with a fifth circulation pump P5, and the second circulation pipeline 82 is provided with the sixth circulation pump P6, the first circulation pipeline 81, the second circulation pipeline 82, the third circulation pipeline 83, the fourth circulation pipeline 84, the fifth circulation pipeline 85, the sixth circulation pipeline 86 and the seventh circulation pipeline 87 are respectively provided with a number of temperature sensors and a number of valves, the buffer water tank 4 is connected with the heat pump cooling and heating machine 6 through the eighth circulation pipeline 88, and the eighth circulation pipeline 88 is provided with the seventh circulation pump, A number of temperature sensors and a number of valves; during cooling in summer, the solar heat collection unit 1 provides hot water to the lithium bromide refrigeration unit 31, and the lithium bromide refrigeration unit 31 provides chilled water to the buffer water tank 4, and the buffer water tank 4 provides refrigeration required for cooling to the fan coil unit 5 Water: when heating in winter, the solar heat collection unit 1 provides hot water to the buffer water tank 4, and the buffer water tank 4 provides hot water for heating to the fan coil unit 5.

In the above specific examples, the melting point of the phase change material is 75-95°C, and the optional phase change materials are as follows:

name Melting point/℃ Enthalpy/(KJ/kg) Trimethylolethane 81-82 (freezing range: 75-73) 155 eicosanoic acid 76.5 227 Mg(NO₃)₂ 6H₂O 89.9 167 Acetamide 82

In the above specific embodiments, the first circulation pipeline 81 is provided with an electric three-way valve S1 and an air-cooled radiator 9, and the solar heat collection unit 1 is connected to the hot water storage tank 7 and the air-cooled radiator respectively through the electric three-way valve S1. 9 connected.

In the above specific embodiments, the solar heat collection unit 1 includes a first solar heat collector group 11 and a second solar heat collector group 12 connected in parallel, and a temperature sensor T1 is installed on the outlet pipe of the first solar heat collector group 11 A temperature sensor T2 is installed on the outlet pipeline of the second solar collector group 12, and a temperature sensor T2 is installed at the confluence of the outlet pipeline of the first solar collector group 11 and the outlet pipeline of the second solar collector group 12. Sensor T3, the water outlet pipeline of the first solar collector group 11 and the second solar collector group 12 are connected to the water storage tank 7 and the air-cooled radiator 9 respectively through the electric three-way valve S1 , A flow sensor F1 and a ball valve V1 are installed between S1 and the hot water storage tank 7, a first expansion tank 13, a first pressure reducing valve J1 and a ball valve V2 are installed between P1 and the hot water storage tank 7, S1 and the air-cooled A gate valve V20 is installed between the radiators 9, the water outlet pipeline of the air-cooled radiator 9 is connected to the first circulation pipeline 81, and a gate valve V19 is installed on the water outlet pipeline of the air-cooled radiator 9, and P1 is connected to the first solar collector A temperature sensor T6 and a temperature sensor T7 are installed between the water inlet pipelines of the group 11 and the second solar collector group 12, temperature sensors T4 and T5 are installed on the hot water storage tank 7, and the inlet of the phase change hot water storage tank 2 A ball valve V17 is installed at the water outlet, a ball valve V18 is installed at the water outlet of the phase change hot water storage tank 2, temperature sensors T18 and T19 are installed on the phase change hot water storage tank 2, and the hot water storage tank 7 is connected to the lithium bromide refrigeration unit 31. P2 and ball valve V3 are successively installed on the water supply pipeline, temperature sensor T9 and ball valve V4 are successively installed on the return water pipeline from the lithium bromide refrigeration unit 31 to the hot water storage tank 7, and the ends of V3 and V4 close to the lithium bromide refrigeration unit 31 are connected with the electric three The through valve S2 is connected, and S2 is connected with the lithium bromide refrigeration unit 31 at the same time. P2, the second expansion tank 41, the second pressure reducing valve J2 and the flow sensor are installed on the common pipeline of the fourth circulation pipeline 84 and the fifth circulation pipeline 85 F2, the fifth circulation line 85 is provided with ball valve V7, ball valve V8 and third pressure reducing valve J3, and the sixth circulation line 86 is provided with temperature sensor T11, temperature sensor T10, ball valve V5 and ball valve V6, T10 and T11 Close to the lithium bromide refrigeration unit 31, temperature sensors T14 and T15 are installed on the buffer water tank 4, temperature sensors T12, temperature sensor T13, ball valve V11 and ball valve V12 are arranged on the third circulation pipeline 83, T12 and T13 are close to the lithium bromide refrigeration unit 31, The seventh circulation pipeline 87 is provided with temperature sensor T16, temperature sensor T17, flow sensor F3, ball valve V9 and ball valve V10, and the eighth circulation pipeline 88 is provided with ball valve V13, ball valve V15, ball valve V14, and ball valve V16.

The working method of the above-mentioned solar air conditioner and phase change energy storage integrated system,

When cooling in summer:

V1, V2, V3, V4, V5, V6, V9～V20 open, V7, V8 close;

When T1 or T2≥85°C, P1 is turned on, the solar collector unit 1 works, and the system enters the heat collection cycle mode; after P1 is turned on and runs for 10 minutes, if T1 and T2<85°C, then P1 is stopped, or, P1 is turned on and Within 10 minutes of operation, if T1 and T2<80°C, then P1 stops, and the heat collection cycle mode stops;

When T4>90°C and T4-T18≥4°C, P6 is turned on, and the phase change storage tank 2 starts to store heat; when T4≤88°C or T4-T18<2°C, P6 stops, and the phase change storage Hot water tank 2 stops heat storage; when T4≤75°C and T18-T4≥6°C, then P6 is turned on, and phase change heat storage tank 2 starts to release heat; when T4>80°C or T18-T4<2°C , then P6 stops, and the phase change heat storage tank 2 stops releasing heat;

When T4≥95°C or T3≥110°C, S1 switches to the air-cooled radiator 9 channel, and at the same time the air-cooled radiator 9 is turned on, and the system turns on the high temperature protection mode; when T4<93°C or T3<105°C, S1 switches to the first circulation pipeline 81, while the air-cooled radiator 9 is closed, and the high temperature protection mode stops;

When T4≥80°C, P2 starts, and when the temperature of the bromine refrigerator generator of the lithium bromide refrigeration unit 31 is greater than or equal to 63°C, the lithium bromide refrigeration unit 31 is turned on, P3, P5 and P4 are turned on, the cooling unit and the fan coil unit 5 work, The solar heat collection unit 1 provides hot water to the lithium bromide refrigeration unit 31, the lithium bromide refrigeration unit 31 provides chilled water to the buffer water tank 4, and the buffer water tank 4 provides the chilled water required for cooling to the fan coil unit 5, and the system starts the refrigeration cycle mode; when T4< 70°C, or, when T15>18°C and the fan coil unit 5 is started, the cooling unit stops working, the heat pump cooler and heater 6 is started, P7 is turned on, the heat pump cooler and heater 6 supplies cooling to the fan coil unit 5, and the fan coil unit 5 cools; When T15≤15℃ or the fan coil unit 5 stops, P7 stops, and the heat pump cooler 6 stops working;

When heating in winter:

V1, V2, V7, V8, V9, V10, V13～V20 open, V3, V4, V5, V6, V11, V12 close;

When T1 or T2≥50°C, P1 is turned on, solar collector unit 1 works, and the system enters the heat collection cycle mode; after P1 is turned on and runs for 10 minutes, if T1 and T2<50°C, then P1 is stopped, or, P1 is turned on and Within 10 minutes of operation, if T1 and T2<45°C, then P1 stops, and the heat collection cycle mode stops;

When T4>60°C and T4-T18≥4°C, P6 is turned on, and the phase change storage tank 2 starts to store heat; when T4≤58°C or T4-T18<2°C, P6 stops, and the phase change storage Hot water tank 2 stops heat storage; when T4≤55°C and T18-T4≥4°C, then P6 is turned on, and phase change heat storage tank 2 starts to release heat; when T4>58°C or T18-T4<2°C , then P6 stops, and the phase change heat storage tank 2 stops releasing heat;

When T4>62°C or T3>90°C, S1 switches to the air-cooled radiator 9 channel, and at the same time the air-cooled radiator 9 is turned on, and the system starts the high temperature protection mode; when T4≤60°C or T3≤88°C, S1 switches to the first circulation pipeline 81, while the air-cooled radiator 9 is closed, and the high temperature protection mode stops;

When T7<2°C, P1 is turned on, S1 is switched to the air-cooled radiator 9 channel, the air-cooled radiator 9 is turned off, and the system enters the anti-freezing circulation mode; when T7≥6°C, P1 is stopped, and S1 is switched to the first circulation pipe Road 81, antifreeze cycle mode stop;

When T15<55°C and T4-T15≥2°C, P2, P4 and fan coil unit 5 start, the system enters the heat exchange cycle mode, the solar collector unit 1 supplies hot water to the buffer water tank 4, and the buffer water tank 4 directs the fan coil Pipe 5 provides hot water for heating, and the system starts heating mode; when T15<45°C and fan coil unit 5 starts, heat pump cooling and heating unit 6 starts, P7 starts, heat pump cooling and heating unit 6 supplies heat to fan coil unit 5, and fan coil unit 5 heating; when T15≥50°C or fan coil unit 5 stops, P7 stops, and heat pump cooling and heating machine 6 stops working.

During the working process of the integrated solar air conditioner and phase change energy storage system, when the water pressure of the first circulation pipeline 81 measured by the first expansion tank 13 is less than 1.5 MPa, the tap water flows through the first pressure reducing valve J1 to the first circulation pipeline. Road 81 replenishes water; when the first expansion tank 13 measures the water pressure of the first circulation line 81 ≥ 2.0MPa, the first decompression valve J1 is closed; when the second expansion tank 41 measures the water pressure of the fourth circulation line 84 or the first When the water pressure of the fifth circulation pipeline 85 is less than 1.5MPa, the tap water will supply water to the fourth circulation pipeline 84 or the fifth circulation pipeline 85 through the second decompression valve J2; when the second expansion tank 41 measures the pressure of the fourth circulation pipeline 84 or the water pressure of the fifth circulation pipeline 85 is greater than or equal to 2.0MPa, the second decompression valve J2 is closed. When T1-T2 > 5°C or T3 > 110°C, the first circulation pipeline 81 alarms; when T4 > 95°C in the summer refrigeration cycle mode, the hot water storage tank 7 alarms; in winter heat exchange cycle mode, When T4>62°C, the hot water storage tank 7 will alarm.

Claims (7)

1. A solar air conditioner and phase change energy storage integrated system, characterized in that: comprising a solar heat collection unit, a phase change heat storage tank, a cooling unit, a buffer water tank, a fan coil unit and a heat pump cooling and heating machine, the described The solar heat collection unit is connected with the hot water storage tank through the first circulation pipeline, and the heat storage coil is installed in the said hot water storage tank, and the said hot water storage tank is connected with the said corresponding water tank through the second circulation pipeline. The variable heat storage tank is connected, and the phase change heat storage tank stores phase change materials. The cooling unit includes a cooling tower and a lithium bromide refrigeration unit. The cooling tower is connected to the The lithium bromide refrigeration unit is connected, the hot water storage tank is connected with the lithium bromide refrigeration unit through the fourth circulation pipeline, and the hot water storage tank is connected with the buffer water tank through the fifth circulation pipeline, There is a common pipeline between the fourth circulation pipeline and the fifth circulation pipeline, the common pipeline is connected to the hot water storage tank, and the lithium bromide refrigeration unit passes through the sixth circulation pipeline The road is connected with the buffer water tank, and the buffer water tank is connected with the fan coil unit through the seventh circulation pipeline, and the first circulation pump P1 with variable frequency is set on the first circulation pipeline, and the A second circulation pump P2 is provided on the fourth circulation pipeline, and P2 is located on the fifth circulation pipeline at the same time, a third circulation pump P3 is provided on the sixth circulation pipeline, and a third circulation pump P3 is provided on the seventh circulation pipeline. There is a fourth circulation pump P4, the fifth circulation pump P5 is set on the third circulation line, the sixth circulation pump P6 is set on the second circulation line, the first circulation line, the second circulation line A number of temperature sensors and a number of valves are respectively arranged on the circulation pipeline, the third circulation pipeline, the fourth circulation pipeline, the fifth circulation pipeline, the sixth circulation pipeline and the seventh circulation pipeline, and the buffer water tank passes through the The eighth circulation pipeline is connected with the heat pump air conditioner, and the eighth circulation pipeline is provided with a seventh circulation pump, a number of temperature sensors and a number of valves; during cooling in summer, the solar heat collection unit provides hot water to the lithium bromide refrigeration unit , the lithium bromide refrigeration unit provides chilled water to the buffer water tank, and the buffer water tank provides the chilled water required for cooling to the fan coil unit; during heating in winter, the solar heat collector unit provides hot water to the buffer water tank, and the buffer water tank provides the fan coil unit with heat required for heating water. 2. An integrated solar air conditioner and phase change energy storage system according to claim 1, characterized in that: the melting point of the phase change material is 75-95°C. 3. An integrated solar air conditioner and phase change energy storage system according to claim 1, characterized in that: the first circulation pipeline is provided with an electric three-way valve S1 and an air-cooled radiator, and the The solar heat collecting unit is respectively connected with the hot water storage tank and the air-cooled radiator through the electric three-way valve S1. 4. An integrated solar air conditioner and phase change energy storage system according to claim 3, characterized in that: said solar heat collection unit includes a first solar heat collector group and a second solar heat collector group connected in parallel A temperature sensor T1 is installed on the outlet pipe of the first solar collector group, a temperature sensor T2 is installed on the outlet pipe of the second solar collector group, and a temperature sensor T2 is installed on the outlet pipe of the first solar collector group. A temperature sensor T3 is installed at the confluence of the outlet pipeline of the heater group and the outlet pipeline of the second solar collector group, and the outlet pipeline of the first solar collector group and the second After the water outlet pipelines of the two solar heat collector groups converge, the electric three-way valve S1 communicates with the hot water storage tank and the air-cooled radiator respectively. Flow sensor F1 and ball valve V1, a first expansion tank, a first pressure reducing valve J1 and a ball valve V2 are installed between P1 and the hot water storage tank, and a gate valve V20 is installed between S1 and the air-cooled radiator , the water outlet pipeline of the air-cooled radiator is connected with the first circulation pipeline, and a gate valve V19 is installed on the water outlet pipeline of the air-cooled radiator, and P1 is connected with the first solar collector A temperature sensor T6 and a temperature sensor T7 are installed between the water inlet pipeline of the group and the second solar collector group, temperature sensors T4 and T5 are installed on the hot water storage tank, and the phase change storage tank A ball valve V17 is installed at the water inlet of the hot water tank, a ball valve V18 is installed at the water outlet of the phase-change heat storage tank, and temperature sensors T18 and T19 are installed on the phase-change heat storage tank. The hot water storage tank is sequentially installed with P2 and ball valve V3 on the water supply pipeline of the lithium bromide refrigeration unit, and the lithium bromide refrigeration unit is sequentially installed with a temperature sensor T9 and a ball valve on the return water pipeline of the described hot water storage tank One end of V4, V3 and V4 close to the lithium bromide refrigeration unit is respectively connected with the electric three-way valve S2, and S2 is connected with the lithium bromide refrigeration unit at the same time, and the fourth circulation line and the fifth circulation line are connected. P2, the second expansion tank, the second decompression valve J2 and the flow sensor F2 are installed on the common pipeline, the ball valve V7, the ball valve V8 and the third decompression valve J3 are arranged on the fifth circulation pipeline, and the first A temperature sensor T11, a temperature sensor T10, a ball valve V5 and a ball valve V6 are arranged on the six-circulation pipeline, T10 and T11 are close to the lithium bromide refrigeration unit, temperature sensors T14 and T15 are installed on the buffer water tank, and the third A temperature sensor T12, a temperature sensor T13, a ball valve V11 and a ball valve V12 are arranged on the circulation pipeline, T12 and T13 are close to the lithium bromide refrigeration unit, and a temperature sensor T16, a temperature sensor T17, and a flow sensor are arranged on the seventh circulation pipeline. F3, the ball valve V9 and the ball valve V10, the ball valve V13, the ball valve V15, the ball valve V14, and the ball valve V16 are arranged on the eighth circulation pipeline. 5. The working method of a solar air conditioner and phase change energy storage integrated system according to claim 4, characterized in that: comprising the following steps: When cooling in summer: V1, V2, V3, V4, V5, V6, V9～V20 open, V7, V8 close; When T1 or T2≥85°C, P1 is turned on, the solar collector unit works, and the system enters the heat collection cycle mode; after P1 is turned on and runs for 10 minutes, if T1 and T2<85°C, then P1 stops, or, P1 turns on and runs Within 10 minutes, if T1 and T2<80°C, then P1 stops, and the heat collection cycle mode stops; When T4>90°C and T4-T18≥4°C, P6 is turned on and the phase change heat storage tank starts to store heat; when T4≤88°C or T4-T18<2°C, P6 stops and the phase change heat storage The water tank stops heat storage; when T4≤75°C and T18-T4≥6°C, then P6 is turned on, and the phase change heat storage tank starts to release heat; when T4>80°C or T18-T4<2°C, then P6 stop, the phase change heat storage tank stops releasing heat; When T4≥95°C or T3≥110°C, S1 switches to the air-cooled radiator path, and at the same time the air-cooled radiator is turned on, and the system turns on the high temperature protection mode; when T4<93°C or T3<105°C, S1 switches to the second The first circulation pipeline, at the same time the air-cooled radiator is closed, and the high temperature protection mode is stopped; When T4≥80°C, P2 starts, and when the generator temperature of the lithium bromide refrigeration unit is ≥63°C, the lithium bromide refrigeration unit is turned on, P3, P5 and P4 are turned on, the cooling unit and the fan coil work, and the solar heat collection unit supplies lithium bromide The refrigerating unit provides hot water, the lithium bromide refrigerating unit provides chilled water to the buffer water tank, and the buffer water tank supplies chilled water to the fan coil, and the system starts the refrigeration cycle mode; when T4<70°C, or, T15>18°C and the fan coil When the tube starts, the cooling unit stops working, the heat pump air conditioner starts, P7 turns on, the heat pump air conditioner supplies cooling to the fan coil, and the fan coil cools; when T15≤15°C or the fan coil stops, P7 stops, and the heat pump cools. machine stops working; When heating in winter: V1, V2, V7, V8, V9, V10, V13～V20 open, V3, V4, V5, V6, V11, V12 close; When T1 or T2≥50°C, P1 is turned on, the solar collector unit works, and the system enters the heat collection cycle mode; after P1 is turned on and runs for 10 minutes, if T1 and T2<50°C, then P1 stops, or, P1 turns on and runs Within 10 minutes, if T1 and T2<45°C, then P1 stops, and the heat collection cycle mode stops; When T4>60°C and T4-T18≥4°C, P6 is turned on, and the phase change heat storage tank starts to store heat; when T4≤58°C or T4-T18<2°C, P6 stops, and the phase change heat storage The water tank stops heat storage; when T4≤55°C and T18-T4≥4°C, then P6 is turned on, and the phase change heat storage tank starts to release heat; when T4>58°C or T18-T4<2°C, then P6 stop, the phase change heat storage tank stops releasing heat; When T4>62°C or T3>90°C, S1 switches to the air-cooled radiator path, and at the same time the air-cooled radiator is turned on, and the system starts the high temperature protection mode; when T4≤60°C or T3≤88°C, S1 switches to the second The first circulation pipeline, at the same time the air-cooled radiator is closed, and the high temperature protection mode is stopped; When T7<2°C, P1 is turned on, S1 is switched to the air-cooled radiator circuit, the air-cooled radiator is turned off, and the system enters the antifreeze cycle mode; when T7≥6°C, P1 is stopped, S1 is switched to the first cycle circuit, Antifreeze cycle mode stops; When T15<55°C and T4-T15≥2°C, P2, P4 and the fan coil unit start, the system enters the heat exchange cycle mode, the solar collector unit provides hot water to the buffer water tank, and the buffer water tank provides heating to the fan coil unit When hot water is needed, the system turns on the heating mode; when T15<45°C and the fan coil unit starts, the heat pump air conditioner starts, P7 is turned on, the heat pump air conditioner supplies heat to the fan coil unit, and the fan coil unit provides heating; when T15≥50°C or the fan coil unit When the coil stops, P7 stops, and the heat pump cooling and heating machine stops working. 6. The working method of a solar air conditioner and phase change energy storage integrated system according to claim 5, characterized in that: when the water pressure of the first circulation pipeline measured by the first expansion tank is <1.5MPa, tap water Supply water to the first circulation pipeline through the first pressure reducing valve J1; when the water pressure of the first circulation pipeline measured by the first expansion tank is ≥2.0MPa, the first pressure reducing valve J1 is closed; when the water pressure of the first expansion tank is measured When the water pressure of the fourth circulation pipeline or the fifth circulation pipeline is less than 1.5MPa, the tap water will supply water to the fourth circulation pipeline or the fifth circulation pipeline through the second decompression valve J2; when the second expansion tank measures the fourth When the water pressure of the circulation pipeline or the fifth circulation pipeline is ≥ 2.0 MPa, the second pressure reducing valve J2 is closed. 7. The working method of a solar air conditioner and phase change energy storage integrated system according to claim 5, characterized in that: when T1-T2>5°C or T3>110°C, the first circulation pipeline alarms; In the summer refrigeration cycle mode, when T4>95°C, the hot water storage tank will alarm; in the winter heat exchange cycle mode, when T4>62°C, the hot water storage tank will alarm.