Distributed multi-energy multi-substance complementary cooling and heating radiation system

Abstract

The application discloses a kind of distributed multi-energy multi-element complementary cooling and heating radiation systems, including solar energy collector, sky radiation plate, energy storage tank, electric air source heat pump, first energy storage and release on-off valve, second energy storage and release on-off valve, third energy storage and release on-off valve, fourth energy storage and release on-off valve, return water main, water supply main, the end coil of cooling and heating radiation system, building envelope, variable frequency pump, regulating valve and on-off valve.The application couples solar energy collector and sky radiation plate with electric air source heat pump, and configures energy storage tank to alleviate energy supply and demand mismatch in time and space, makes up the intermittent and instability of renewable energy such as solar energy, improves the utilization rate and usage of renewable energy in heating ventilation air conditioning system, promotes the development and utilization of renewable energy, reduces the dependence of system on traditional energy, effectively reduces system energy consumption, reduces carbon emissions.

Description

Technical Field

[0001] This invention relates to the field of energy, specifically to a distributed multi-energy, multi-material complementary heating and cooling radiant system. Background Technology

[0002] The construction industry is a major energy consumer and carbon emitter, accounting for more than 30% of global energy consumption and approximately 33% of greenhouse gas emissions. Heating, ventilation, and air conditioning (HVAC) systems account for about 50% of a building's overall energy use, and with global development trends, they are expected to consume even more energy. Therefore, reducing the energy consumption of HVAC systems is crucial for low-carbon development.

[0003] Solar energy, as a new type of renewable energy, boasts numerous advantages such as abundant reserves and safety. However, due to limitations imposed by factors such as day and night cycles, climate, and geographical conditions, its utilization is easily affected by meteorological factors, making it impossible to achieve continuous and stable heating. The utilization of resources such as solar and wind energy also suffers from problems such as low energy flux density and the randomness and periodicity of energy supply.

[0004] Radiative cooling is a passive cooling technology where objects on Earth can dissipate heat into the low-temperature outer space through thermal radiation, utilizing the high transmittance of the "atmospheric window" wavelength. However, due to variations in local atmospheric conditions and cloud cover, as well as the instability of intermittent atmospheric transparency, the cooling effect of radiative cooling systems is intermittent.

[0005] Radiant floor heating has been widely used due to its advantages such as energy saving, comfort and meeting human physiological needs, but it still has disadvantages such as buried pipes reducing the effective floor height of buildings and the floor surface covering increasing the thermal resistance.

[0006] With the increasing popularity of air conditioning, electricity consumption is growing rapidly, leading to peak-hour power shortages. The electricity consumption of air conditioning systems is largely synchronized with the peak and off-peak electricity demand, further widening the peak-to-valley difference in power load and preventing the full utilization of off-peak electricity prices.

[0007] Radiant heating and cooling systems have become increasingly popular in research and application due to their potential for energy saving, improved thermal comfort, and space saving. However, there is currently a lack of radiant heating and cooling systems that can effectively utilize low-grade renewable energy sources (such as air source heat pumps and solar collectors) to effectively reduce system energy consumption. Summary of the Invention

[0008] In view of the shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide a distributed multi-energy multi-material complementary heating and cooling radiant system.

[0009] The technical solution of the present invention to solve the aforementioned technical problem is to provide a distributed multi-energy multi-material complementary cooling and heating radiant system, characterized in that the system includes a solar collector, a sky radiant panel, an energy storage tank, an electric air source heat pump, a first energy storage and release on / off valve, a second energy storage and release on / off valve, a third energy storage and release on / off valve, a fourth energy storage and release on / off valve, a return water main pipe, a supply water main pipe, terminal coils of the cooling and heating radiant system, a building envelope, a frequency converter pump, regulating valves, and on / off valves;

[0010] The return water inlet of the solar collector is connected to the main return water pipe through a pipeline. The pipeline is equipped with a shut-off valve and a variable frequency pump. The supply water pipe of the solar collector is equipped with a shut-off valve and splits into two primary branches at the end. The first primary branch is equipped with a first regulating valve for the energy storage tank and splits into two secondary branches at the end. The end of one secondary branch is connected to one end of the energy storage tank. The other secondary branch is equipped with a second regulating valve for the energy storage tank and is connected to the main return water pipe at the end. The end of the second primary branch splits into two pipelines. The end of one pipeline is connected to the main supply water pipe, and the other pipeline is equipped with a variable frequency pump and a shut-off valve and is connected to the main return water pipe at the end.

[0011] The water supply port of the electric air source heat pump is connected to the main water supply pipe through the electric air source heat pump water supply pipeline, and on / off valves four and five are installed on the electric air source heat pump water supply pipeline; the return water port of the electric air source heat pump is connected to the main return water pipe through the pipeline, and on / off valve six and variable frequency pump two are installed on the pipeline; the water supply port of the sky radiant panel is connected to the main water supply pipe through the pipeline, and on / off valve seven is installed on the pipeline; the return water port of the sky radiant panel is connected to the main return water pipe through the pipeline, and on / off valve eight and variable frequency pump three are installed on the pipeline.

[0012] The outlet pipe of variable frequency pump five is divided into two primary branches. One primary branch is equipped with a second energy storage on / off valve, and the end of this branch is connected to the other end of the energy storage tank and the beginning of the pipe where the first energy storage on / off valve is located. The end of the pipe where the first energy storage on / off valve is located is connected to the inlet pipe of variable frequency pump five. The other primary branch is equipped with a fourth energy storage on / off valve, and the end of this branch is divided into four secondary branches. The first secondary branch is equipped with a third regulating valve for the energy storage tank, and the end is connected to the return water main pipe. The second secondary branch is equipped with a fourth regulating valve for the energy storage tank, and the end is connected to the supply water main pipe. The third secondary branch is equipped with a fifth regulating valve for the energy storage tank, and the end is connected to the electric air source heat pump water supply pipe and connected to the electric air source heat pump water supply pipe between the on / off valve four and the on / off valve five. The fourth secondary branch is equipped with a third energy storage on / off valve, and the end is connected to the inlet pipe of variable frequency pump five.

[0013] The building envelope contains terminal coils for a heating and cooling radiant system; one port of the terminal coil is equipped with a user-side water supply regulating valve, which is connected to the main water supply pipe; the other port of the terminal coil is equipped with a user-side return water on / off valve, which is connected to the main return water pipe.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] (1) This invention couples a solar collector with a sky radiant panel to an electric air source heat pump and configures an energy storage tank to alleviate the mismatch between energy supply and demand in time and space, make up for the shortcomings of intermittency and instability of renewable energy sources such as solar energy, improve the utilization rate and usage rate of renewable energy in HVAC systems, promote the development and utilization of renewable energy, reduce the system's dependence on traditional energy, effectively reduce system energy consumption, and reduce carbon emissions.

[0016] (2) This invention is divided into a winter heating mode and a summer cooling mode. The main heat source for winter heating is a solar collector, and the auxiliary heat source is an electric air source heat pump; the main cold source for summer cooling is a sky radiant panel, and the auxiliary cold source is an electric air source heat pump; the electric power of the electric air source heat pump mainly comes from clean energy sources such as wind power and photovoltaics.

[0017] (3) The present invention adds a sky radiation panel, which improves the energy-saving effect of the heating and cooling radiation system.

[0018] (4) Energy storage tanks can alleviate the mismatch between energy supply and demand in time and space, effectively play the role of peak shaving and valley filling on the load side, and improve the stability and reliability of the system.

[0019] (5) Compared with floor radiant systems, the present invention places the coil inside the building envelope, with less obstruction from furniture and a larger heat dissipation area, which can create a more uniform thermal environment.

[0020] (6) This invention utilizes off-peak electricity prices at night to produce low-temperature cold water using an electric air source heat pump and stores it in an energy storage tank. During the day, the stored cold water is released to reduce the electricity load of the heating and cooling radiant system during peak hours of the power grid. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure and connection of the present invention;

[0022] In the diagram, the components are: 1. Solar collector; 2. Sky radiant panel; 3. Energy storage tank; 4. Electric air source heat pump; 5. Variable frequency pump 1; 6. Variable frequency pump 2; 7. Variable frequency pump 3; 8. Variable frequency pump 4; 9. On / off valve 1; 10. On / off valve 2; 11. On / off valve 3; 12. Energy storage tank first regulating valve; 13. Energy storage tank second regulating valve; 14. Energy storage tank third regulating valve; 15. Energy storage tank fourth regulating valve; 16. Energy storage tank fifth regulating valve; 17. On / off valve 4; 18. On / off valve 5. On / off valve 6 19, On / off valve 7 20, On / off valve 8 21, Variable frequency pump 5 22, First energy storage and release on / off valve 23, Second energy storage and release on / off valve 24, Third energy storage and release on / off valve 25, Fourth energy storage and release on / off valve 26, User-side water supply regulating valve 27, User-side return water on / off valve 28, Return water main pipe 29, Water supply main pipe 30, Terminal coil of heating and cooling radiant system 31, Building envelope 32, Electric air source heat pump water supply pipeline 33. Detailed Implementation

[0023] Specific embodiments of the present invention are given below. These specific embodiments are only used to further illustrate the present invention in detail and do not limit the scope of protection of the claims of the present invention.

[0024] This invention provides a distributed multi-energy multi-material complementary cooling and heating radiant system (hereinafter referred to as the system), characterized in that the system includes a solar collector 1, a sky radiant panel 2, an energy storage tank 3, an electric air source heat pump 4, a first energy storage and release on / off valve 23, a second energy storage and release on / off valve 24, a third energy storage and release on / off valve 25, a fourth energy storage and release on / off valve 26, a return water main pipe 29, a supply water main pipe 30, terminal coils of the cooling and heating radiant system 31, a building envelope structure 32, a frequency converter pump, regulating valves, and on / off valves;

[0025] The return water inlet of solar collector 1 is connected to the return water main pipe 29 via a pipeline. The pipeline is equipped with a shut-off valve 9 and a variable frequency pump 5. The supply water pipeline of solar collector 1 is equipped with a shut-off valve 10, and the pipeline ends into two primary branches. The first primary branch is equipped with a first regulating valve 12 of the energy storage tank, and the pipeline ends into two secondary branches. The end of one secondary branch is connected to one end of the energy storage tank 3. The other secondary branch is equipped with a second regulating valve 13 of the energy storage tank, and the end is connected to the return water main pipe 29. The end of the second primary branch is divided into two pipelines via a tee. The end of one pipeline is connected to the supply water main pipe 30, and the other pipeline is equipped with a variable frequency pump 8 and a shut-off valve 11, and the end is connected to the return water main pipe 29.

[0026] The water supply port of the electric air source heat pump 4 is connected to the main water supply pipe 30 through the electric air source heat pump water supply pipe 33. The electric air source heat pump water supply pipe 33 is equipped with on / off valve 4 17 and on / off valve 5 18. The water return port of the electric air source heat pump 4 is connected to the main return water pipe 29 through a pipe. The pipe is equipped with on / off valve 6 19 and variable frequency pump 2 6. The water supply port of the sky radiant panel 2 is connected to the main water supply pipe 30 through a pipe. The pipe is equipped with on / off valve 7 20. The water return port of the sky radiant panel 2 is connected to the main return water pipe 29 through a pipe. The pipe is equipped with on / off valve 8 21 and variable frequency pump 3 7.

[0027] The outlet pipe of the variable frequency pump 522 is divided into two primary branches. One primary branch is equipped with a second energy storage shut-off valve 24, and its end is connected via a tee to the other end of the energy storage tank 3 and the beginning of the pipe containing the first energy storage shut-off valve 23. The end of the pipe containing the first energy storage shut-off valve 23 is connected to the inlet pipe of the variable frequency pump 522. The other primary branch is equipped with a fourth energy storage shut-off valve 26, and its end is divided into four secondary branches. The first secondary branch is equipped with the energy storage tank... The third regulating valve 14 is connected to the return water main pipe 29 at its end; the second secondary branch is equipped with the energy storage tank fourth regulating valve 15, which is connected to the water supply main pipe 30 at its end; the third secondary branch is equipped with the energy storage tank fifth regulating valve 16, which is connected to the electric air source heat pump water supply pipeline 33 at its end, and the connection point is located on the electric air source heat pump water supply pipeline 33 between the on / off valve fourth 17 and the on / off valve fifth 18; the fourth secondary branch is equipped with the third energy storage on / off valve 25, which is connected to the water inlet pipeline of the variable frequency pump fifth 22 at its end;

[0028] The building envelope 32 is equipped with a terminal coil 31 of a heating and cooling radiant system; a user-side water supply regulating valve 27 is installed on one port of the terminal coil 31, and the end is connected to the main water supply pipe 30; a user-side return water on / off valve 28 is installed on the other port of the terminal coil 31, and the end is connected to the main return water pipe 29.

[0029] The operating mode of the system of this invention is:

[0030] This system can adjust its operating mode according to the system's heating and cooling loads and the operating status of solar collector 1, sky radiant panel 2, and electric air source heat pump 4. Assume the heat provided by solar collector 1 is Q1, the cooling provided by sky radiant panel 2 is Q2, the energy stored in storage tank 3 (i.e., heat storage or cold storage) is Q3, and the system's heating and cooling load is Q.

[0031] Operating Condition 1: Under winter heating conditions, the following operating mode shall be adopted:

[0032] Mode 1: When the heat provided by the solar collector 1 is greater than the system heat load (i.e., Q1>Q), the solar collector 1 supplies heat:

[0033] When the stored heat Q3 in the energy storage tank 3 has not reached the maximum value, the energy storage tank 3 stores the excess heat, and the variable-frequency pump four 8 adjusts the operating power of the variable-frequency pump four 8 according to the water supply temperature of the solar collector 1. Open the on-off valve two 10, the first regulating valve of the energy storage tank 12, the first energy storage and release on-off valve 23, the variable-frequency pump five 22, the fourth energy storage and release on-off valve 26, the third regulating valve of the energy storage tank 14, the water supply regulating valve on the user side 27, the return water on-off valve on the user side 28, the variable-frequency pump one 5, the on-off valve one 9, the variable-frequency pump four 8, and the on-off valve three 11, and the rest of the components are closed. The circulating water in the solar collector 1 is heated by the solar collector 1 and then mixed with the return water from the variable-frequency pump four through the on-off valve two 10. The mixed water enters the end coil 31 of the system through the water supply main pipe 30 and the water supply regulating valve on the user side 27 for heating, and then returns to the solar collector 1 through the return water on-off valve on the user side 28, the return water main pipe 29, the variable-frequency pump one 5, and the on-off valve one 9. The water in the energy storage tank 3 passes through the first energy storage and release on-off valve 23, the variable-frequency pump five 22, the fourth energy storage and release on-off valve 26, the third regulating valve of the energy storage tank 14, the return water main pipe 29, the variable-frequency pump one 5, and the on-off valve one 9, and is heated in the solar collector 1 and then enters the energy storage tank 3 through the on-off valve two 10 and the first regulating valve of the energy storage tank 12 for storage.

[0034] When the stored heat Q3 in the energy storage tank 3 reaches the maximum value, the energy storage tank 3 stops storing heat, and the variable-frequency pump four 8 adjusts the operating power of the variable-frequency pump four 8 according to the water supply temperature of the solar collector 1. Open the on-off valve two 10, the water supply regulating valve on the user side 27, the return water on-off valve on the user side 28, the variable-frequency pump one 5, the on-off valve one 9, the variable-frequency pump four 8, and the on-off valve three 11, and the rest of the components are closed. The circulating water in the solar collector 1 is heated by the solar collector 1 and then mixed with the return water from the variable-frequency pump four through the on-off valve two 10. The mixed water enters the end coil 31 of the system through the water supply main pipe 30 and the water supply regulating valve on the user side 27 for heating, and then returns to the solar collector 1 through the return water on-off valve on the user side 28, the return water main pipe 29, the variable-frequency pump one 5, and the on-off valve one 9.

[0035] Mode 2: When the heat provided by the solar collector 1 is less than the system heat load (0<Q1<Q), the solar collector 1 and the energy storage tank 3 or the electric air source heat pump 4 jointly supply heat:

[0036] When the energy storage tank 3 has stored heat (Q3>0) and the output power can meet the system's heat load, the solar collector 1 and the energy storage tank 3 work together to provide heat. The following valves are opened: on / off valve 210, energy storage tank first regulating valve 12, energy storage tank third regulating valve 14, third energy storage / release on / off valve 25, variable frequency pump 522, second energy storage / release on / off valve 24, user-side water supply regulating valve 27, user-side water return on / off valve 28, variable frequency pump 15, and on / off valve 19; all other components are closed. The circulating water in the solar collector 1, after being heated by the solar collector 1, enters the system terminal coil 31 through on / off valve 210, the main water supply pipe 30, and the user-side water supply regulating valve 27 for heating, and then returns to the solar collector 1 through the user-side water return on / off valve 28, the main water return pipe 29, variable frequency pump 15, and on / off valve 9. Hot water in the energy storage tank enters the system terminal coil 31 for heating via the first regulating valve 12 of the energy storage tank, the main water supply pipe 30, and the user-side water supply regulating valve 27. After heating, it returns to the energy storage tank 3 via the user-side return water shut-off valve 28, the return water main pipe 29, the third regulating valve 14 of the energy storage tank, the third energy storage and release shut-off valve 25, the variable frequency pump 5 22, and the second energy storage and release shut-off valve 24.

[0037] When there is no heat stored in the energy storage tank 3 (Q3=0), the solar collector 1 and the electric air source heat pump 4 work together to provide heat. The following valves are opened: on / off valve 210, user-side water supply regulating valve 27, user-side return water on / off valve 28, variable frequency pump 5, on / off valve 9, variable frequency pump 26, on / off valve 619, on / off valve 417, and on / off valve 518; all other components are closed. The circulating water in the solar collector 1, after being heated by the solar collector 1, enters the system terminal coil 31 through on / off valve 210, the main water supply pipe 30, and the user-side water supply regulating valve 27 for heating, and then returns to the solar collector 1 through the user-side return water on / off valve 28, the main return water pipe 29, variable frequency pump 5, and on / off valve 9. After being heated by the electric air source heat pump 4, the circulating water in the electric air source heat pump 4 enters the system terminal coil 31 through the on / off valve 4 17, the electric air source heat pump water supply pipeline 33, the on / off valve 5 18, the water supply main pipe 30, and the user-side water supply regulating valve 27 for heating. After that, it returns to the electric air source heat pump 4 through the user-side return water on / off valve 28, the return water main pipe 29, the variable frequency pump 2 6, and the on / off valve 6 19.

[0038] Mode 3: At night or when the solar collector 1 receives insufficient solar radiation (i.e., Q1 = 0), the electric air source heat pump 4 provides heating.

[0039] When there is heat stored in the energy storage tank 3 (Q3>0), the electric air source heat pump 4 and the energy storage tank 3 work together to provide heat. The following valves are opened: the third regulating valve 14, the third energy storage and release on / off valve 25, the variable frequency pump 5 22, the second energy storage and release on / off valve 24, the first regulating valve 12, the on / off valve 4 17, the on / off valve 5 18, the user-side water supply regulating valve 27, the user-side water return on / off valve 28, the variable frequency pump 2 6, and the on / off valve 6 19. All other components are closed. The circulating water in the electric air source heat pump 4 is heated by the electric air source heat pump 4 and then flows through the on / off valve 4 17, the electric air source heat pump water supply line 33, the on / off valve 5 18, the main water supply line 30, and the user-side water supply regulating valve 27 into the system terminal coil 31 for heating. After heating, it returns to the electric air source heat pump 4 through the user-side water return on / off valve 28, the main water return line 29, the variable frequency pump 2 6, and the on / off valve 6 19. Hot water in storage tank 3 enters the system terminal coil 31 for heating via the first regulating valve 12 of the storage tank, the main water supply pipe 30, and the user-side water supply regulating valve 27. After heating, it returns to storage tank 3 via the user-side return water shut-off valve 28, the return water main pipe 29, the third regulating valve 14 of the storage tank, the third energy storage and release shut-off valve 25, the variable frequency pump 5 22, and the second energy storage and release shut-off valve 24.

[0040] When there is no heat stored in the energy storage tank 3 (Q3=0), the electric air source heat pump 4 provides heat. The following valves are opened: on / off valve 4 17, on / off valve 5 18, user-side water supply regulating valve 27, user-side return water on / off valve 28, variable frequency pump 2 6, and on / off valve 6 19; all other components are closed. The circulating water in the electric air source heat pump 4 is heated and then flows through on / off valve 4 17, electric air source heat pump water supply pipeline 33, on / off valve 5 18, water supply main pipe 30, and user-side water supply regulating valve 27 into the system terminal coil 31 for heating. After heating, it returns to the electric air source heat pump 4 through user-side return water on / off valve 28, return water main pipe 29, variable frequency pump 2 6, and on / off valve 6 19.

[0041] Operating Condition 2: Under summer cooling conditions, the following operating mode shall be adopted:

[0042] Mode 1: When the cooling capacity provided by the sky radiant panel 2 is greater than the system cooling load (i.e., Q2>Q), the sky radiant panel 2 provides cooling.

[0043] When the cold storage capacity Q3 of the energy storage tank 3 has not reached the maximum value, the energy storage tank 3 stores the excess cold. Open the second regulating valve 13 of the energy storage tank, the fourth regulating valve 15 of the energy storage tank, the third energy storage and release on-off valve 25, the variable-frequency pump five 22, the second energy storage and release on-off valve 24, the on-off valve seven 20, the user-side water supply regulating valve 27, the user-side return water on-off valve 28, the variable-frequency pump three 7, and the on-off valve eight 21, and close all other components. The circulating water in the sky radiation panel 2 is cooled by the sky radiation panel 2 and then enters the end coil 31 of the system for cooling through the on-off valve seven 20, the water supply main pipe 30, and the user-side water supply regulating valve 27, and then returns to the sky radiation panel 2 through the user-side return water on-off valve 28, the return water main pipe 29, the variable-frequency pump three 7, and the on-off valve eight 21. The water in the energy storage tank 3 passes through the second regulating valve 13 of the energy storage tank, the return water main pipe 29, the variable-frequency pump three 7, and the on-off valve eight 21, is cooled in the sky radiation panel 2, and then enters the energy storage tank 3 for storage through the on-off valve seven 20, the water supply main pipe 30, the fourth regulating valve 15 of the energy storage tank, the third energy storage and release on-off valve 25, the variable-frequency pump five 22, and the second energy storage and release on-off valve 24.

[0044] When the cold storage capacity Q3 of the energy storage tank 3 reaches the maximum value, the energy storage tank 3 stops storing cold. Open the on-off valve seven 20, the user-side water supply regulating valve 27, the user-side return water on-off valve 28, the variable-frequency pump three 7, and the on-off valve eight 21, and close all other components. The circulating water in the sky radiation panel 2 is cooled by the sky radiation panel 2 and then enters the end coil 31 of the system for cooling through the on-off valve seven 20, the water supply main pipe 30, and the user-side water supply regulating valve 27, and then returns to the sky radiation panel 2 through the user-side return water on-off valve 28, the return water main pipe 29, the variable-frequency pump three 7, and the on-off valve eight 21.

[0045] Mode 2: When the cooling provided by the sky radiation panel 2 is less than the system cooling load (i.e., 0 < Q2 < Q), the sky radiation panel 2 and the energy storage tank 3 or the electric air source heat pump 4 jointly supply cooling:

[0046] When the energy storage tank 3 has stored cold energy (Q3>0) and the output power can meet the system's cooling load, the sky radiant panel 2 and the energy storage tank 3 work together to provide cooling. The following valves are opened: the second regulating valve 13, the fourth regulating valve 15, the first energy storage / discharge on / off valve 23, the fifth variable frequency pump 22, the fourth energy storage / discharge on / off valve 26, the seventh on / off valve 20, the user-side water supply regulating valve 27, the user-side water return on / off valve 28, the third variable frequency pump 7, and the eighth on / off valve 21. All other components are closed. The circulating water in the sky radiant panel 2, after being cooled by the sky radiant panel 2, enters the system terminal coil 31 for cooling via the seventh on / off valve 20, the main water supply pipe 30, and the user-side water supply regulating valve 27. Then, it returns to the sky radiant panel 2 via the user-side water return on / off valve 28, the main water return pipe 29, the third variable frequency pump 7, and the eighth on / off valve 21. The cold water in the energy storage tank 3 enters the system terminal coil 31 for cooling through the first energy storage and release on / off valve 23, the variable frequency pump 5 22, the fourth energy storage and release on / off valve 26, the fourth regulating valve 15 of the energy storage tank, the main water supply pipe 30, and the user-side water supply regulating valve 27. Then it returns to the energy storage tank 3 through the user-side return water on / off valve 28, the return water main pipe 29, and the third regulating valve 13 of the energy storage tank.

[0047] When there is no cooling capacity stored in storage tank 3 (Q3=0), the sky radiant panel 2 and the electric air source heat pump 4 work together to provide cooling. The following valves are opened: on / off valve 7 20, variable frequency pump 3 7, on / off valve 8 21, on / off valve 4 17, on / off valve 5 18, variable frequency pump 2 6, on / off valve 6 19, user-side water supply regulating valve 27, and user-side return water on / off valve 28; all other components are closed. The circulating water in the sky radiant panel 2, after being cooled by the sky radiant panel 2, enters the system terminal coil 31 for cooling via on / off valve 7 20, main water supply pipe 30, and user-side water supply regulating valve 27. Then, it returns to the sky radiant panel 2 via user-side return water on / off valve 28, main return water pipe 29, variable frequency pump 3 7, and on / off valve 8 21. The circulating water in the electric air source heat pump 4 is cooled by the electric air source heat pump 4 and then enters the system terminal coil 31 for cooling through the on-off valve 4 17, the electric air source heat pump water supply pipeline 33, the on-off valve 5 18, the water supply main pipe 30, and the user-side water supply regulating valve 27. After that, it returns to the electric air source heat pump 4 through the user-side return water on-off valve 28, the return water main pipe 29, the variable frequency pump 2 6, and the on-off valve 6 19.

[0048] Mode 3: When the sky radiant panel 2 cannot provide cooling during the day or due to weather factors (i.e., Q2 = 0), the electric air source heat pump 4 provides cooling.

[0049] When there is cold energy stored in energy storage tank 3 (Q3>0), the electric air source heat pump 4 and energy storage tank 3 work together to provide cooling. The following valves are opened: second regulating valve 13, fourth regulating valve 15, first energy storage / discharge on / off valve 23, variable frequency pump 5 22, fourth energy storage / discharge on / off valve 26, on / off valve 4 17, on / off valve 5 18, user-side water supply regulating valve 27, user-side water return on / off valve 28, variable frequency pump 2 6, and on / off valve 6 19. All other components are closed. The circulating water in the electric air source heat pump 4 is cooled by the electric air source heat pump 4 and then flows through on / off valve 4 17, electric air source heat pump water supply line 33, on / off valve 5 18, water supply main line 30, and user-side water supply regulating valve 27 into the system terminal coil 31 for cooling. Afterwards, it returns to the electric air source heat pump 4 through user-side water return on / off valve 28, water return main line 29, variable frequency pump 2 6, and on / off valve 6 19. The cold water in the energy storage tank 3 enters the system terminal coil 31 for cooling through the first energy storage and release on / off valve 23, the variable frequency pump 5 22, the fourth energy storage and release on / off valve 26, the fourth regulating valve 15 of the energy storage tank, the main water supply pipe 30, and the user-side water supply regulating valve 27. Then it returns to the energy storage tank 3 through the user-side return water on / off valve 28, the return water main pipe 29, and the third regulating valve 13 of the energy storage tank.

[0050] When there is no cooling capacity stored in storage tank 3 (Q3=0), the electric air source heat pump 4 provides cooling. The following valves are opened: on / off valve 4 17, on / off valve 5 18, user-side water supply regulating valve 27, user-side return water on / off valve 28, variable frequency pump 2 6, and on / off valve 6 19; all other components are closed. The circulating water in the electric air source heat pump 4 is cooled by the electric air source heat pump 4 and then flows through on / off valve 4 17, electric air source heat pump water supply line 33, on / off valve 5 18, main water supply line 30, and user-side water supply regulating valve 27 to the system terminal coil 31 for cooling. Afterwards, it returns to the electric air source heat pump 4 through user-side return water on / off valve 28, main return water line 29, variable frequency pump 2 6, and on / off valve 6 19.

[0051] Operating Condition 3: Off-peak electricity price electric air source heat pump with 4-stage cold storage:

[0052] During nighttime periods with low electricity prices, the electric air source heat pump 4 generates cooling capacity, and the low-temperature chilled water output by the electric air source heat pump 4 is stored in the energy storage tank 3. During periods with relatively high electricity prices, less electricity is used or no electricity is used, and the cooling capacity stored in the energy storage tank 3 is released to meet the system's cooling load. The water in the energy storage tank 3 passes through the second regulating valve 13, the return water main pipe 29, the second variable frequency pump 6, and the sixth on / off valve 19. After being cooled in the electric air source heat pump 4, the water then passes through the fourth on / off valve 17, the electric air source heat pump water supply pipe 33, the fifth regulating valve 16, the third energy storage and release on / off valve 25, the fifth variable frequency pump 22, and the second energy storage and release on / off valve 24 before entering the energy storage tank 3 for storage.

[0053] Example 1

[0054] Energy efficiency of this system:

[0055] 1) Winter heating: During the heating season, solar collector 1 is used for heating during the day, and excess heat absorbed when solar radiation is strong is stored in energy storage tank 3. This excess heat is released to the system at night or on cloudy or rainy days when solar radiation is insufficient. When solar radiation is insufficient at night or on cloudy or rainy days, an electric air source heat pump 4 is used as the system's heat source.

[0056] Assume that the average heating power of solar collector 1 during the heating season is 500kW, the average daily working time is 8 hours, the supply water temperature of solar collector 1 is 95℃, and after mixing with the 30℃ return water to a temperature of 45℃, it is supplied to end users through the main supply pipe 30. A certain ultra-low energy consumption residential community has a building area of ​​20,000 m². 2 The average heat load during the heating season is 30W / m². 2 The COP of the electric air source heat pump 4 is 2.6.

[0057] The average daily heat output of the solar collector is: Q1 = 500kW × 8h = 4MWh.

[0058] The average daily heat load of the heating system is: Q = 20000 m³ 2 ×30W / m 2 ×24h=14.4MWh.

[0059] Compared with a heating system that uses an electric air source heat pump as the heat source, the power saving is: W = (4MWh) / 2.6 = 1.53MWh.

[0060] The reduction in system energy consumption is: η = (4MWh) / (14.4MWh) = 27.8%.

[0061] 2) Summer cooling: On clear summer nights, the sky radiant panel 2 is used for cooling, and excess cooling capacity is stored in the energy storage tank 3. During the day or when the sky radiant panel 2 cannot provide cooling due to weather factors, the electric air source heat pump 4 is used as the cold source.

[0062] Assume that the average heating power of the radiant heating panel 2 during the heating season is 360kW, the average daily operating time is 8 hours, the supply water temperature is 18℃, and the return water temperature is 24℃. A certain ultra-low energy consumption residential community has a building area of ​​20,000 m². 2 The average cooling load in summer is 40W / m². 2 The electric air source heat pump has a 4COP of 2.6.

[0063] The average daily cooling capacity of the sky radiant panels is: Q1 = 360kW × 8h = 2.88MWh.

[0064] The system's average daily cooling load is: Q = 20000 m³ 2 ×40W / m 2×24h=19.2MWh.

[0065] Compared with a system that uses an electric air source heat pump as the cold source, the power saving is: W = (2.88MWh) / 2.6 = 1.1MWh.

[0066] The reduction in system energy consumption is: η = (2.88 MWh) / (19.2 MWh) = 15%.

[0067] Example 2

[0068] Improving the economic efficiency of this system by utilizing peak-valley electricity pricing:

[0069] During summer nights, the electric air-source heat pump 4 can be used for cooling during off-peak electricity prices, and the chilled water output by the electric air-source heat pump 4 can be stored in the energy storage tank 3. During periods of relatively high electricity prices, less electricity is used or no electricity is used, and the cooling capacity of the energy storage tank 3 can be released for use. In this way, the electricity cost of the heating and cooling radiant system can be reduced, energy efficiency can be improved, and carbon emissions can be reduced.

[0070] Assuming the average summer electricity price is 0.65 yuan / kWh, the off-peak electricity price is 0.25 yuan / kWh, the supply water temperature of the electric air source heat pump 4 during the off-peak electricity period is 16℃, the return water temperature is 24℃, the average daily cooling capacity is 5MWh, the cooling period is 100 days, and the COP of the electric air source heat pump 4 is 2.6.

[0071] Compared to systems that do not utilize peak-valley electricity pricing, the annual electricity cost savings are: P = ((5 × 10) 3 ) / 2.6)×(0.65-0.25)×100=76,900 yuan.

[0072] Example 3

[0073] The economic advantages of this system:

[0074] Suppose a residential community is upgrading its heating and cooling radiant heating system, changing from the original electric air source heat pump system 4 to this system. The cost of solar collector 1 is 500 yuan / m². 2 The design area is 2000m² 2 The cost of the Sky Radiation Panel 2 is 300 yuan / m². 2 The design area is 2000m² 2 The cost of energy storage tank 3 is 3000 yuan / m³. 3 The design capacity is 200m³. 3 The total building area is 20,000 square meters. 2 The system has a heating season of 120 days and a cooling season of 100 days. The average heat load during the heating season is 30W / m². 2 The average cooling load in summer is 40W / m². 2The COP of the electric air source heat pump 4 is 2.6, and the average annual electricity price is 0.622 yuan / kWh.

[0075] The cost of solar collector 1 is: C1 = 500 × 2000 = 1 million yuan; the cost of sky radiation panel 2 is: C2 = 300 × 2000 = 600,000 yuan; the cost of energy storage tank 3 is: C3 = 3000 × 200 = 600,000 yuan.

[0076] The total investment cost is: C total =C1+C2+C3=2.2 million yuan.

[0077] The annual electricity savings are: W = 120 × 1.53 + 100 × 1.1 = 293.6 MWh.

[0078] The annual electricity cost savings are: C4 = 293.6 MWh × 0.622 yuan / kWh = 183,000 yuan.

[0079] The investment period is: N = 220 / 18.3 = 12 years.

[0080] In conclusion, this system can bring considerable economic benefits.

[0081] Any aspects not covered in this invention are applicable to existing technologies.

Claims

1. A distributed multi-energy, multi-material complementary heating and cooling radiant system, characterized in that, The system includes a solar collector (1), a sky radiant panel (2), an energy storage tank (3), an electric air source heat pump (4), a first energy storage and release on / off valve (23), a second energy storage and release on / off valve (24), a third energy storage and release on / off valve (25), a fourth energy storage and release on / off valve (26), a return water main pipe (29), a water supply main pipe (30), terminal coils of the heating and cooling radiant system (31), a building envelope (32), a frequency converter pump, regulating valves and on / off valves; The return water inlet of the solar collector (1) is connected to the return water main pipe (29) through a pipeline. A shut-off valve 1 (9) and a variable frequency pump 1 (5) are installed on the pipeline. A shut-off valve 2 (10) is installed on the water supply pipeline of the solar collector (1). The pipeline ends into two primary branches. A first regulating valve (12) for the energy storage tank is installed on the first primary branch. The pipeline ends into two secondary branches. The end of one secondary branch is connected to one end of the energy storage tank (3). A second regulating valve (13) for the energy storage tank is installed on the other secondary branch. The end of the second primary branch is connected to two pipelines. The end of one pipeline is connected to the water supply main pipe (30). A variable frequency pump 4 (8) and a shut-off valve 3 (11) are installed on the other pipeline. The end of the other pipeline is connected to the return water main pipe (29). The water supply port of the electric air source heat pump (4) is connected to the main water supply pipe (30) through the electric air source heat pump water supply pipeline (33). The electric air source heat pump water supply pipeline (33) is equipped with a shut-off valve four (17) and a shut-off valve five (18). The return water port of the electric air source heat pump (4) is connected to the return water main pipe (29) through the pipeline. The pipeline is equipped with a shut-off valve six (19) and a variable frequency pump two (6). The water supply port of the sky radiant panel (2) is connected to the main water supply pipe (30) through the pipeline. The pipeline is equipped with a shut-off valve seven (20). The return water port of the sky radiant panel (2) is connected to the return water main pipe (29) through the pipeline. The pipeline is equipped with a shut-off valve eight (21) and a variable frequency pump three (7). The outlet pipe of the variable frequency pump five (22) is divided into two primary branches; a second energy storage shut-off valve (24) is installed on one primary branch, and the end of this branch is connected to the other end of the energy storage tank (3) and the beginning of the pipeline where the first energy storage shut-off valve (23) is located; the end of the pipeline where the first energy storage shut-off valve (23) is located is connected to the inlet pipe of the variable frequency pump five (22); a fourth energy storage shut-off valve (26) is installed on the other primary branch, and the end of this branch is divided into four secondary branches; a third regulating valve of the energy storage tank is installed on the first secondary branch. 14), the end is connected to the return water main (29); the second secondary branch is equipped with the energy storage tank fourth regulating valve (15), the end is connected to the water supply main (30); the third secondary branch is equipped with the energy storage tank fifth regulating valve (16), the end is connected to the electric air source heat pump water supply pipeline (33) and connected to the electric air source heat pump water supply pipeline (33) between the on / off valve four (17) and the on / off valve five (18); the fourth secondary branch is equipped with the third energy storage on / off valve (25), the end is connected to the water inlet pipeline of the variable frequency pump five (22); The building envelope (32) is equipped with a terminal coil (31) of a heating and cooling radiant system; a user-side water supply regulating valve (27) is installed on one port of the terminal coil (31) of the heating and cooling radiant system, and the end is connected to the main water supply pipe (30); a user-side return water shut-off valve (28) is installed on the other port of the terminal coil (31) of the heating and cooling radiant system, and the end is connected to the main return water pipe (29).

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