A solar ground source heat pump coupled energy supply system

Abstract

The utility model provides a kind of solar ground source heat pump coupling's energy supply system, belong to energy supply technical field.The solar ground source heat pump coupling's energy supply system includes solar heat collection component, heat pump component, buried pipe heat exchange component, heating water supply pipeline b, heating return water pipeline a, valve component and controller.In the utility model, solar energy and geothermal energy are integrated using valve component.According to the temperature of medium generated by solar heat collection component, heating supply and return water temperature, buried pipe heat exchange component side supply and return water temperature, a variety of different solar heat collection components and heat pump component coupling operation mode can be realized by adjusting valve component, which can greatly improve the operation energy efficiency ratio of heat pump component and reduce the power consumption of the whole system.

Description

Technical Field

[0001] This utility model relates to the field of energy supply technology, specifically to an energy supply system coupled with a solar ground source heat pump. Background Technology

[0002] Ground source heat pumps utilize soil as a heat storage medium. In winter, they extract heat from the soil, and in summer, they release heat back into it. The ratio of heat released to heat extracted must be between 0.8 and 1.25; otherwise, soil temperature imbalance will occur, affecting heating and cooling efficiency. Therefore, for buildings in northern regions with only heating needs, using ground source heat pumps will lead to a gradual decrease in soil temperature, impacting winter heating performance.

[0003] Solar energy is limited by the intensity of solar irradiance on any given day. When irradiance is high, solar collectors generate more heat, resulting in a higher outlet temperature for the medium, which can be directly used for heating. Conversely, when solar irradiance is low, solar collectors generate less heat, leading to a lower outlet temperature for the medium. The energy efficiency ratio (EER) of a heat pump is significantly influenced by its evaporation and condensation temperatures. Studies indicate that for every 1°C increase in evaporation temperature, the EER of the heat pump can improve by 3%-5%, and for every 1°C decrease in condensation temperature, the EER can improve by 2%-3%. Current coupling of solar and geothermal energy either directly restores soil temperature or directly uses the energy for heating, failing to adjust the connection between the solar collector and the ground source heat pump based on the temperatures of the solar collector, the heating supply and return water, and the temperature of the buried pipes, thus failing to fully utilize the advantages of solar energy resources. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the existing technology by proposing a solar-ground source heat pump coupled energy supply system.

[0005] This utility model proposes a solar-ground source heat pump coupled energy supply system, including a solar collector assembly, a heat pump assembly, a buried pipe heat exchange assembly, a heating water supply pipe b for conveying heating water, a heating return pipe a for conveying heating return water, a valve assembly for connecting to the solar collector assembly, the heat pump assembly, the buried pipe heat exchange assembly, the heating water supply pipe b, and the heating return pipe a respectively, and a controller for controlling the solar collector assembly, the heat pump assembly, the buried pipe heat exchange assembly, and the valve assembly respectively; the controller is used to control the valve assembly to perform a first preset operation, so that the heating return water enters the solar collector assembly for heating for heating; the controller is used to control the valve assembly to perform a second preset operation, so that the heating return water sequentially enters the heat pump assembly and the solar collector assembly for heating for heating; the controller is used to control the valve assembly to perform a third preset operation. The system operates as follows: a portion of the heating return water enters the heat pump assembly for heating, and another portion enters the solar collector assembly for heating, with the two portions of return water mixed for heating; the controller controls the valve assembly to perform a fourth preset operation, causing the heating return water to sequentially enter the solar collector assembly and the heat pump assembly for heating; the controller controls the valve assembly to perform a fifth preset operation, causing the water outlet from the heat pump assembly to sequentially enter the buried pipe heat exchange assembly and the solar collector assembly for heating; the controller controls the valve assembly to perform a sixth preset operation, causing a portion of the water outlet from the heat pump assembly to enter the buried pipe heat exchange assembly for heating, and another portion to enter the solar collector assembly for heating; the controller controls the valve assembly to perform a seventh preset operation, causing the solar collector assembly, the heat pump assembly, and the buried pipe heat exchange assembly to be connected in series to supplement the soil with heat.

[0006] Furthermore, it also includes a first temperature detection structure for detecting the temperature of the heating return water in the heating return water pipe a, a second temperature detection structure for detecting the temperature of the heating supply water in the heating supply water pipe b, the solar collector assembly includes a solar collector 3 and a third temperature detection structure for detecting the outlet water temperature of the solar collector 3, the heat pump assembly includes a heat pump host 1 and the third temperature detection structure, the heat pump host 1 includes a condenser and an evaporator, and the third temperature detection structure is used to detect the inlet temperature of the evaporator; the buried pipe heat exchange assembly includes a buried pipe heat exchanger 2, a fourth temperature detection structure for detecting the outlet water temperature of the buried pipe heat exchanger 2 and a fifth temperature detection structure for detecting the soil temperature.

[0007] Further, the valve assembly includes a first valve 6-1, a second valve 6-2, a third valve 6-3, a fourth valve 6-4, a fifth valve 6-5, a sixth valve 6-6, a seventh valve 6-7, an eighth valve 6-8, a ninth valve 6-9, a tenth valve 6-10, an eleventh valve 6-11, a twelfth valve 6-12, a thirteenth valve 6-13, a fourteenth valve 6-14, a fifteenth valve 6-15, an evaporator-side circulation pump 4, and a load-side circulation pump 5; the condenser outlet 13 of the heat pump main unit 1 is connected to the inlet of the tenth valve 6-10. The inlet of the twelfth valve 6-12 is connected, and the outlet of the tenth valve 6-10 is connected to the outlet of the thirteenth valve 6-13 and the heating water supply pipe b, respectively. The condenser inlet 14 of the heat pump unit 1 is connected to the outlet of the fourteenth valve 6-14. The inlet of the fourteenth valve 6-14 is connected to the inlet of the fifteenth valve 6-15 and the outlet of the load-side circulation pump 5, respectively. The inlet of the load-side circulation pump 5 is connected to the outlet of the ninth valve 6-9 and the outlet of the seventh valve 6-7, respectively. The inlet of the seventh valve 6-7 is connected to the eighth valve 6-8, respectively. The inlet and heating return water pipe a are connected. The evaporator outlet 12 of the heat pump host 1 is connected to the inlet of the evaporator-side circulation pump 4. The outlet of the evaporator-side circulation pump 4 is connected to the inlet of the buried pipe heat exchanger 2 and the inlet of the sixth valve 6-6. The outlet of the sixth valve 6-6 is connected to the outlet of the fourth valve 6-4, the inlet of the solar collector 3, and the outlet of the second valve 6-2. The outlet of the solar collector 3 is connected to the inlet of the first valve 6-1 and the inlet of the third valve 6-3. The outlet of the third valve 6-3 is connected to the fifth valve 6-4 and the inlet of the heating return water pipe a. The outlet of valve 6-5 is connected to the evaporator inlet 11 of the heat pump host 1. The outlet of the buried pipe heat exchanger 2 is connected to the inlet of the fourth valve 6-4 and the inlet of the fifth valve 6-5. The outlet of the first valve 6-1 is connected to the inlet of the thirteenth valve 6-13 and the inlet of the ninth valve 6-9. The inlet of the second valve 6-2 is connected to the outlet of the eleventh valve 6-11 and the outlet of the twelfth valve 6-12. The outlet of the fifteenth valve 6-15 is connected to the inlet of the eleventh valve 6-11 and the outlet of the eighth valve 6-8.

[0008] Furthermore, it also includes a first alarm, the controller of which is used to control the first alarm to sound an alarm when the outlet water temperature of the solar collector is higher than the heating water supply temperature.

[0009] Furthermore, it also includes a second alarm, the controller being used to control the second alarm to sound an alarm when the outlet water temperature of the solar collector is lower than the heating target temperature and the difference between the outlet water temperature of the solar collector and the heating target temperature is a first preset value.

[0010] Furthermore, it also includes a third alarm, the controller of which is used to control the third alarm to sound an alarm when the outlet water temperature of the solar collector is higher than the heating return water temperature and the outlet water temperature of the solar collector is lower than the heating supply water temperature.

[0011] Furthermore, it also includes a fourth alarm, the controller of which is used to control the fourth alarm to sound an alarm when the outlet water temperature of the solar collector is lower than the heating return water temperature and the outlet water temperature of the solar collector is higher than the evaporator inlet temperature.

[0012] Furthermore, it also includes a fifth alarm, the controller of which is used to control the fifth alarm to sound an alarm when the difference between the outlet water temperature of the solar collector and the outlet water temperature of the buried pipe heat exchanger is a second preset value.

[0013] Furthermore, it also includes a sixth alarm, which the controller is used to control to sound an alarm when the soil temperature is lower than a third preset value.

[0014] Furthermore, the valve assembly also includes multiple connecting pipes; the condenser outlet 13 of the heat pump unit 1 is connected to the inlet of the tenth valve 6-10 and the inlet of the twelfth valve 6-12 via at least one connecting pipe; the outlet of the tenth valve 6-10 is connected to the outlet of the thirteenth valve 6-13 and the heating water supply pipe b via at least one connecting pipe; the condenser inlet 14 of the heat pump unit 1 is connected to the outlet of the fourteenth valve 6-14 via at least one connecting pipe; and the inlet of the fourteenth valve 6-14 is connected to the outlet of the heating water supply pipe b via at least one connecting pipe. The inlet of the fifteenth valve 6-15 is connected to the outlet of the load-side circulating pump 5. The inlet of the load-side circulating pump 5 is connected to the outlet of the ninth valve 6-9 and the outlet of the seventh valve 6-7 via at least one connecting pipe. The inlet of the seventh valve 6-7 is connected to the inlet of the eighth valve 6-8 and the heating return water pipe a via at least one connecting pipe. The evaporator outlet 12 of the heat pump unit 1 is connected to the inlet of the evaporator-side circulating pump 4 via at least one connecting pipe. The outlet of the evaporator-side circulating pump 4 is connected to the buried pipe heat exchanger via at least one connecting pipe. The inlet of valve 2 is connected to the inlet of the sixth valve 6-6. The outlet of the sixth valve 6-6 is connected to the outlet of the fourth valve 6-4, the inlet of the solar collector 3, and the outlet of the second valve 6-2 via at least one connecting pipe. The outlet of the solar collector 3 is connected to the inlet of the first valve 6-1 and the inlet of the third valve 6-3 via at least one connecting pipe. The outlet of the third valve 6-3 is connected to the outlet of the fifth valve 6-5 and the evaporator inlet 11 of the heat pump unit 1 via at least one connecting pipe. The outlet of the buried pipe heat exchanger 2 is connected to... The valve 6-1 is connected to the inlet of the fourth valve 6-4 and the inlet of the fifth valve 6-5 via at least one connecting pipe. The outlet of the first valve 6-1 is connected to the inlet of the thirteenth valve 6-13 and the inlet of the ninth valve 6-9 via at least one connecting pipe. The inlet of the second valve 6-2 is connected to the outlet of the eleventh valve 6-11 and the outlet of the twelfth valve 6-12 via at least one connecting pipe. The outlet of the fifteenth valve 6-15 is connected to the inlet of the eleventh valve 6-11 and the outlet of the eighth valve 6-8 via at least one connecting pipe.

[0015] The energy supply system coupled with a solar-ground source heat pump of this utility model has the following beneficial effects: This application utilizes a valve assembly to integrate solar and geothermal energy. Based on the temperature of the water generated by the solar collector, the heating supply and return water temperatures, and the supply and return water temperatures on the buried pipe heat exchanger side, the valve assembly can be adjusted to achieve various coupled operation modes of the solar collector and heat pump components. This can greatly improve the operating energy efficiency ratio of the heat pump components and reduce the overall system's power consumption. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0017] Figure 1 This is a circuit connection diagram of a solar-ground source heat pump coupled energy supply system according to an embodiment of the present invention.

[0018] Among them, 1-heat pump main unit, 2-buried pipe heat exchanger, 3-solar collector. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0020] Please see Figure 1This utility model discloses a solar-ground source heat pump coupled energy supply system, comprising a solar collector assembly, a heat pump assembly, a buried pipe heat exchange assembly, a heating water supply pipe b for conveying heating water, a heating return pipe a for conveying heating return water, a valve assembly for connecting to the solar collector assembly, the heat pump assembly, the buried pipe heat exchange assembly, the heating water supply pipe b, and the heating return pipe a respectively, and a controller for controlling the solar collector assembly, the heat pump assembly, the buried pipe heat exchange assembly, and the valve assembly respectively; the controller controls the valve assembly to perform a first preset operation, causing the heating return water to enter the solar collector assembly for heating for heating; the controller controls the valve assembly to perform a second preset operation, causing the heating return water to sequentially enter the heat pump assembly and the solar collector assembly for heating for heating; the controller controls the valve assembly to perform a third preset operation. The system is configured to operate such that a portion of the heating return water enters the heat pump assembly for heating, and another portion enters the solar collector assembly for heating, with the two portions of return water mixed for heating purposes; the controller controls the valve assembly to perform a fourth preset operation, causing the heating return water to sequentially enter the solar collector assembly and the heat pump assembly for heating purposes; the controller controls the valve assembly to perform a fifth preset operation, causing the water outlet from the heat pump assembly to sequentially enter the buried pipe heat exchange assembly and the solar collector assembly for heating; the controller controls the valve assembly to perform a sixth preset operation, causing a portion of the water outlet from the heat pump assembly to enter the buried pipe heat exchange assembly for heating, and another portion to enter the solar collector assembly for heating; the controller controls the valve assembly to perform a seventh preset operation, causing the solar collector assembly, the heat pump assembly, and the buried pipe heat exchange assembly to be connected in series to supplement the soil with heat.

[0021] Here, the controller controls the solar collector, heat pump, underground pipe heat exchanger, and valve assembly to perform seven operating modes. In the first operating mode, the controller controls the valve assembly to perform a first preset operation, causing the heating return water to enter the solar collector for heating. In the second operating mode, the controller controls the valve assembly to perform a second preset operation, causing the heating return water to sequentially enter the heat pump and solar collector for heating. In the third operating mode, the controller controls the valve assembly to perform a third preset operation, causing part of the heating return water to enter the heat pump for heating and another part to enter the solar collector for heating, and controlling the mixing of the two parts for heating. In the fourth operating mode, the controller controls the valve assembly to perform a fifth preset operation, causing part of the heating return water to enter the heat pump for heating and another part to enter the solar collector for heating, controlling the mixing of the two parts for heating. In the four operating modes, the controller controls the valve assembly to perform the fourth preset operation, causing the heating return water to sequentially enter the solar collector and heat pump components for heating. In the fifth operating mode, the controller controls the valve assembly to perform the fifth preset operation, causing the water in the heat pump component to sequentially enter the buried pipe heat exchange component and solar collector for heating. In the sixth operating mode, the controller controls the valve assembly to perform the sixth preset operation, causing part of the water from the heat pump component to enter the buried pipe heat exchange component for heating and the other part to enter the solar collector for heating. In the seventh operating mode, the controller controls the valve assembly to perform the seventh preset operation, causing the solar collector, heat pump, and buried pipe heat exchange component to be connected in series to supplement the soil with heat.In the first operating mode, the heating return water directly enters the solar collector module, and the heated water is used directly for heating. In the second operating mode, the heating return water preferentially enters the heat pump module for heating. After being heated by the heat pump module, the heating return water enters the solar collector module and is heated to the target heating temperature before being used for heating. This operating mode can effectively reduce the condensing temperature of the heat pump module and improve its energy efficiency ratio. In the third operating mode, the heating return water is divided into two streams, one of which enters the heat pump module for heating, and the other enters the solar collector module for heating. The two streams of heating return water are then mixed and used directly for heating. In the fourth operating mode, the heating return water preferentially enters the solar collector module for heating, and then the heated heating return water passes through the heat pump. In the first operating mode, the components heat the water, and the heated water is directly used for heating. This mode reduces the output of the heat pump components, effectively reducing the system's power consumption. In the second operating mode, the evaporator outlet water of the heat pump components preferentially enters the buried pipe heat exchange components for heating. The water heated by the buried pipe heat exchange components then enters the solar collector components for further heating, increasing the evaporation temperature of the heat pump components. In the third operating mode, the water on the evaporator side of the heat pump components is divided into two parts: one part enters the ground pipe heat exchange components for heating, and the other part enters the solar collector components for heating. This mode reduces system resistance and lowers the power consumption of the water pump. In the fourth operating mode, the solar collector 3, the heat pump unit 1, and the buried pipe heat exchanger 2 are connected in series to achieve soil heat supplementation. This application adjusts the connection relationship between the solar collector components and the heat pump components based on the temperature of the solar collector components, the heating supply and return water temperatures, and the temperature on the buried pipe heat exchange component side, which can fully utilize the advantages of solar energy resources.

[0022] As an example of a solar-ground source heat pump coupled energy supply system in this embodiment, it may further include a first temperature detection structure for detecting the temperature of the heating return water in the heating return water pipe a, a second temperature detection structure for detecting the temperature of the heating supply water in the heating supply water pipe b, a solar collector assembly including a solar collector 3 and a third temperature detection structure for detecting the outlet water temperature of the solar collector 3, a heat pump assembly including a heat pump host 1 and a third temperature detection structure, the heat pump host 1 including a condenser and an evaporator, and the third temperature detection structure for detecting the inlet temperature of the evaporator; and a buried pipe heat exchange assembly including a buried pipe heat exchanger 2, a fourth temperature detection structure for detecting the outlet water temperature of the buried pipe heat exchanger 2, and a fifth temperature detection structure for detecting the soil temperature.

[0023] Specifically, the working principle of heat pump unit 1 is based on the reverse Carnot cycle, and the specific process is as follows: Low-temperature liquid refrigerant in the evaporator absorbs heat from the environment (such as air, water, or soil) and evaporates into a low-temperature gaseous state. During this process, the refrigerant absorbs heat from the environment, causing it to evaporate. The compressor compresses the low-temperature gaseous refrigerant into a high-temperature, high-pressure gaseous state. Through compression, the temperature and pressure of the refrigerant increase, preparing it for subsequent heat release. The high-temperature gaseous refrigerant releases heat to the target medium (such as indoor air or water) in the condenser, condensing itself into a high-pressure liquid state. In the condenser, the refrigerant releases heat, typically used for heating or cooling. The expansion valve reduces the pressure and temperature of the high-pressure liquid refrigerant, allowing it to re-enter the evaporator cycle. Through the expansion valve, the pressure and temperature of the refrigerant decrease, preparing it to absorb heat again. The working principle of heat pump unit 1 is to transfer heat energy from a low-temperature heat source to a high-temperature heat source through the above cycle process, achieving heating and cooling functions. This device consumes only a small amount of electricity to drive the compressor, yet can transfer a large amount of environmental heat energy, thus achieving highly efficient heating or cooling. The first, second, third, fourth, and fifth temperature detection structures can all be temperature sensors.

[0024] Specifically, the coefficient of performance (COP) of a heat pump is closely related to its evaporation and condensation temperatures. Changes in these temperatures directly affect the COP. The effect of evaporation temperature on COP: Evaporation temperature refers to the saturation temperature at which the refrigerant changes from liquid to gas in the evaporator. The lower the evaporation temperature, the higher the COP and the higher the efficiency of the heat pump. This is because a lower evaporation temperature allows the heat pump to absorb heat from the environment more effectively, thus improving system efficiency. The effect of condensation temperature on COP: Condensation temperature refers to the temperature at which the heat pump releases the absorbed heat to a high-temperature region. Generally, the higher the condensation temperature, the lower the COP and the lower the efficiency of the heat pump. This is because a higher condensation temperature reduces the temperature difference when the heat pump releases heat, thus reducing system performance. The combined effect of evaporation and condensation temperatures on heat pump performance: In practical applications, scientifically and rationally setting the evaporation and condensation temperatures is crucial for improving the efficiency and performance of the heat pump. Lower evaporation temperatures and moderate condensation temperatures allow the heat pump to operate more efficiently, reducing energy consumption and lowering operating costs. Therefore, by reasonably adjusting these two parameters according to actual needs and environmental conditions, the advantages of heat pumps can be fully utilized and the service life of the equipment can be extended.

[0025] The valve assembly includes a first valve 6-1, a second valve 6-2, a third valve 6-3, a fourth valve 6-4, a fifth valve 6-5, a sixth valve 6-6, a seventh valve 6-7, an eighth valve 6-8, a ninth valve 6-9, a tenth valve 6-10, an eleventh valve 6-11, a twelfth valve 6-12, a thirteenth valve 6-13, a fourteenth valve 6-14, a fifteenth valve 6-15, an evaporator-side circulation pump 4, and a load-side circulation pump 5; the condenser outlet 13 of the heat pump main unit 1 is connected to the inlet of the tenth valve 6-10. The inlet of the 12th valve 6-12 is connected; the outlet of the 10th valve 6-10 is connected to the outlet of the 13th valve 6-13 and the heating water supply pipe b, respectively; the condenser inlet 14 of the heat pump unit 1 is connected to the outlet of the 14th valve 6-14; the inlet of the 14th valve 6-14 is connected to the inlet of the 15th valve 6-15 and the outlet of the load-side circulating pump 5, respectively; the inlet of the load-side circulating pump 5 is connected to the outlet of the 9th valve 6-9 and the outlet of the 7th valve 6-7, respectively; and the inlet of the 7th valve 6-7 is connected to the outlet of the 8th valve 6-8, respectively. The inlet and heating return water pipe a are connected. The evaporator outlet 12 of the heat pump unit 1 is connected to the inlet of the evaporator-side circulation pump 4. The outlet of the evaporator-side circulation pump 4 is connected to the inlet of the buried pipe heat exchanger 2 and the inlet of the sixth valve 6-6. The outlet of the sixth valve 6-6 is connected to the outlet of the fourth valve 6-4, the inlet of the solar collector 3, and the outlet of the second valve 6-2. The outlet of the solar collector 3 is connected to the inlet of the first valve 6-1 and the inlet of the third valve 6-3. The outlet of the third valve 6-3 is connected to the fifth valve... The outlet of valve 6-5 is connected to the evaporator inlet 11 of the heat pump unit 1. The outlet of the buried pipe heat exchanger 2 is connected to the inlet of the fourth valve 6-4 and the inlet of the fifth valve 6-5. The outlet of the first valve 6-1 is connected to the inlet of the thirteenth valve 6-13 and the inlet of the ninth valve 6-9. The inlet of the second valve 6-2 is connected to the outlet of the eleventh valve 6-11 and the outlet of the twelfth valve 6-12. The outlet of the fifteenth valve 6-15 is connected to the inlet of the eleventh valve 6-11 and the outlet of the eighth valve 6-8.

[0026] Specifically, this application includes a heat pump main unit 1, a buried pipe heat exchanger 2, a solar collector 3, an evaporator-side circulation pump 4, a load-side circulation pump 5, multiple valves, and related pipelines. The system connections are as follows: the condenser outlet 13 of the heat pump unit 1 is connected to the inlet of the tenth valve 6-10 and the inlet of the 6-12 valve respectively; the outlet of the tenth valve 6-10 is connected to the outlet of the thirteenth valve 6-13 and the heating water supply pipe b respectively; the condenser inlet 14 of the heat pump unit 1 is connected to the outlet of the fourteenth valve 6-14; the inlet of the fourteenth valve 6-14 is connected to the inlet of the fifteenth valve 6-15 and the outlet of the load-side circulation pump 5 respectively; the inlet of the load-side circulation pump 5 is connected to the outlet of the ninth valve 6-9 and the outlet of the seventh valve 6-7 respectively; the inlet of the seventh valve 6-7 is connected to the inlet of the eighth valve 6-8 and the heating return water pipe a respectively; the evaporator outlet 12 of the heat pump unit 1 is connected to the inlet of the evaporator-side circulation pump 4; the outlet of the evaporator-side circulation pump 4 is connected to the inlet of the buried pipe heat exchanger 2 and the inlet of the sixth valve 6-6 respectively. The outlet of the sixth valve 6-6 is connected to the outlet of the fourth valve 6-4, the inlet of the solar collector 3, and the outlet of the second valve 6-2. The outlet of the solar collector 3 is connected to the inlet of the first valve 6-1 and the inlet of the third valve 6-3. The outlet of the third valve 6-3 is connected to the outlet of the fifth valve 6-5 and the evaporator inlet 11 of the heat pump unit 1. The outlet of the buried pipe heat exchanger 2 is connected to the inlet of the fourth valve 6-4 and the inlet of the fifth valve 6-5. The outlet of the first valve 6-1 is connected to the inlet of the thirteenth valve 6-13 and the inlet of the ninth valve 6-9. The inlet of the second valve 6-2 is connected to the outlet of the eleventh valve 6-11 and the outlet of the twelfth valve 6-12. The outlet of the fifteenth valve 6-15 is connected to the inlet of the eleventh valve 6-11 and the outlet of the eighth valve 6-8.

[0027] As an example of a solar-ground source heat pump coupled energy supply system in this embodiment, it may also include a first alarm, the controller of which is used to control the first alarm to sound an alarm when the outlet water temperature of the solar collector is higher than the heating water supply temperature.

[0028] Specifically, the first alarm sounds to remind the user that the outlet water temperature of the solar collector is higher than the heating supply water temperature. When the outlet water temperature of solar collector 3 is higher than the heating supply water temperature and the heat generated by solar collector 3 meets the heating demand, the controller executes the first operating mode and controls the valve assembly to perform the first preset operation. When the outlet water temperature of solar collector 3 is higher than the heating supply water temperature and the heat generated by solar collector 3 does not meet the heating demand, the controller executes the second operating mode and controls the valve assembly to perform the second preset operation.

[0029] Specifically, in the first working mode: when the outlet water temperature of solar collector 3 is higher than the heating supply water temperature, and the heat generated by solar collector 3 is sufficient to meet the heating demand, the valve is switched to allow the heating return water to directly enter solar collector 3 for heating and then be used directly for heating. The heating supply water temperature is generally to meet the indoor temperature and the hot water temperature required by indoor heat dissipation equipment, typically at a low-temperature heating temperature of 40-50℃. The heat generated by solar collector 3 is generally the solar irradiance multiplied by the conversion efficiency, but this method is generally not easy to measure the actual heat generated. In practical applications, the specific heat of the medium * the temperature difference between the inlet and outlet * the flow rate of the medium is used. If the outlet temperature of solar collector 3 does not reach the required heating temperature (e.g., 45℃) when all the heating return water enters, it indicates that the heat generated by the collector is insufficient to solve the heating problem. The heating demand refers to the heat required to meet the heating temperature (room temperature 18℃). By judging whether the room temperature has reached the first preset temperature, it is determined whether the heat generated by solar collector 3 can meet the heating demand. In the first working mode, the solar collector 3 has a relatively high temperature and does not participate in the operation of the evaporator side of the heat pump host 1, but only participates in the operation of the condenser side of the heat pump host 1.

[0030] Specifically, in the second operating mode: when the outlet water temperature of solar collector 3 is higher than the heating supply water temperature, and the heat generated by solar collector 3 is insufficient to meet heating demands, a valve switch is used to prioritize the flow of heating return water into heat pump unit 1. After being heated by heat pump unit 1, it enters solar collector 3 and is heated to the target temperature for heating. This method effectively reduces the condensing temperature of heat pump unit 1 and improves its energy efficiency ratio. With a heating supply water temperature of 45℃ and a return water temperature of 35℃, the heating return water prioritizes entering heat pump unit 1. Heat pump unit 1 heats the heating return water from 35℃ to 40℃, and the 40℃ hot water enters solar collector 3 for further heating to 45℃ for heating. If there is no solar collector 3, heat pump unit 1 needs to directly heat the heating return water from 35℃ to 45℃. The outlet water temperature and condensing temperature of heat pump unit 1 are directly related and generally differ by 3-5℃. In the example above, the condensing temperature is reduced from 50℃ to 45℃. The inherent characteristic of heat pump unit 1 is that for every 1°C decrease in condensing temperature, the energy efficiency ratio increases by 2-3%, thus achieving a reduction in the condensing temperature of heat pump unit 1. In the second operating mode, the solar collector 3 has a relatively high temperature and does not participate in the operation of the evaporator side of heat pump unit 1, but only in the operation of the condenser side of heat pump unit 1.

[0031] As an example of a solar-ground source heat pump coupled energy supply system in this embodiment, it may also include a second alarm device. The controller is used to control the second alarm device to issue an alarm when the outlet water temperature of the solar collector is lower than the heating target temperature and the difference between the outlet water temperature of the solar collector and the heating target temperature is a first preset value.

[0032] Specifically, the second alarm sounds to remind the user that the outlet water temperature of the solar collector is lower than the heating target temperature and the difference between the outlet water temperature of the solar collector and the heating target temperature is the first preset value. When the outlet water temperature of the solar collector 3 is lower than the heating target temperature and the difference between the outlet water temperature of the solar collector and the heating target temperature is the first preset value, the controller executes the third working mode and controls the valve assembly to perform the third preset operation.

[0033] Specifically, in the third operating mode: when the outlet water temperature of the solar collector 3 is close to the target heating temperature, the solar collector 3 and the heat pump unit 1 are connected in parallel by switching valves. That is, the heating return water is divided into two paths, one of which enters the heat pump unit 1 for heating, and the other enters the solar collector 3 for heating. The two return water streams are mixed and used directly for heating.

[0034] As an example of a solar-ground source heat pump coupled energy supply system in this embodiment, it may also include a third alarm device. The controller is used to control the third alarm device to issue an alarm when the outlet water temperature of the solar collector is higher than the heating return water temperature and the outlet water temperature of the solar collector is lower than the heating supply water temperature.

[0035] Specifically, the third alarm sounds to remind the user that at this time, the outlet water temperature of the solar collector is higher than the heating return water temperature and lower than the heating supply water temperature. When the outlet water temperature of the solar collector 3 is higher than the heating return water temperature but lower than the heating supply water temperature, the controller executes the fourth working mode and controls the valve assembly to perform the fourth preset operation.

[0036] Specifically, in the fourth operating mode: when the outlet water temperature of the solar collector 3 is higher than the heating return water temperature but lower than the heating supply water temperature, the valve is switched to allow the heating return water to preferentially enter the solar collector 3 for heating, and then be directly supplied for heating after being heated by the heat pump unit 1. This method reduces the output of the heat pump unit 1, which can effectively reduce the power consumption of the system.

[0037] As an example of a solar-ground source heat pump coupled energy supply system in this embodiment, it may also include a fourth alarm device. The controller is used to control the fourth alarm device to issue an alarm when the outlet water temperature of the solar collector is lower than the heating return water temperature and the outlet water temperature of the solar collector is higher than the evaporator inlet temperature.

[0038] Specifically, the fourth alarm sounds to remind the user that at this time, the outlet water temperature of the solar collector is lower than the heating return water temperature and the outlet water temperature of the solar collector is higher than the evaporator inlet temperature. When the outlet water temperature of the solar collector 3 is lower than the heating return water temperature but higher than the evaporator inlet temperature, the controller executes the fifth working mode and controls the valve assembly to perform the fifth preset operation, so that the evaporator outlet water enters the buried pipe heat exchange assembly and the solar collector assembly in sequence for heating.

[0039] Specifically, in the fifth operating mode: when the outlet water temperature of solar collector 3 is lower than the heating return water temperature but higher than the evaporator inlet temperature, a valve switch is used to prioritize the evaporator outlet water entering the buried pipe heat exchanger 2 before entering the solar collector 3 for further heating, thereby increasing the evaporation temperature of the heat pump unit 1 and improving its energy efficiency ratio. The normal process is that the evaporator outlet water first enters the buried pipe heat exchanger 2, is heated by it, and then enters the heat pump unit 1. Normally, the evaporator outlet water temperature of the heat pump unit 1 is 5℃, which rises to 10℃ after being heated by the buried pipe heat exchanger 2. The new system process is that the 10℃ water after being heated by the buried pipe heat exchanger 2 enters the collector, is heated to 20℃ by the solar collector 3, and then enters the evaporator of the heat pump unit 1 to further increase the evaporation temperature. Theoretically, for every 1℃ increase in the evaporator temperature of the heat pump unit 1, the energy efficiency ratio of the heat pump unit 1 increases by 3-5%.

[0040] As an example of a solar-ground source heat pump coupled energy supply system in this embodiment, it may also include a fifth alarm device. The controller is used to control the fifth alarm device to issue an alarm when the difference between the outlet water temperature of the solar collector and the outlet water temperature of the buried pipe heat exchanger is a second preset value.

[0041] Specifically, the fifth alarm sounds to remind the user that the difference between the outlet water temperature of the solar collector and the outlet water temperature of the buried pipe heat exchanger is the second preset value. When the difference between the outlet water temperature of the solar collector 3 and the outlet water temperature of the buried pipe heat exchanger 2 is the second preset value, the controller executes the sixth working mode and controls the valve assembly to perform the sixth preset operation, so that the solar collector 3 and the buried pipe heat exchanger 2 operate in parallel to allow part of the water on the evaporator side to enter the buried pipe heat exchanger 2 for heating and the other part to enter the solar collector 3 for heating.

[0042] Specifically, in the sixth operating mode: when the outlet water temperature of solar collector 3 is close to that of buried pipe heat exchanger 2, the solar collector 3 and the buried pipe heat exchanger 2 are switched via valves to operate in parallel. Part of the water from the evaporator side enters the buried pipe heat exchanger 2, and part enters the solar collector 3. The advantage is reduced system resistance and lower pump power consumption.

[0043] As an example of a solar-ground source heat pump coupled energy supply system in this embodiment, it may also include a sixth alarm, which is controlled by the controller to issue an alarm when the soil temperature is lower than a third preset value.

[0044] Specifically, the sixth alarm sounds to remind the user that the soil temperature is lower than the third preset value. When there is no heating demand and the soil temperature is lower than the third preset value, the controller will execute the seventh working mode and control the valve assembly to perform the seventh preset operation.

[0045] Specifically, in the seventh operating mode: when there is no heating demand and the heat generated by the solar collector 3 is needed to restore soil temperature, the solar collector 3, heat pump unit 1, and buried pipe heat exchanger 2 can be connected in series by switching valves to achieve the purpose of soil heat replenishment. During winter operation, the heat pump unit 1 continuously extracts heat from the soil, causing the soil temperature to gradually decrease. Therefore, measures to replenish heat to the soil are required during the non-heating season. Generally, the ratio of heat release to heat replenishment should be controlled between 0.8 and 1.25 to maintain normal system operation. The first, second, third, fourth, fifth, and sixth alarms can all be audible and visual alarms.

[0046] The valve assembly also includes multiple connecting pipes; the condenser outlet 13 of the heat pump unit 1 is connected to the inlet of the tenth valve 6-10 and the inlet of the twelfth valve 6-12 via at least one connecting pipe; the outlet of the tenth valve 6-10 is connected to the outlet of the thirteenth valve 6-13 and the heating water supply pipe b via at least one connecting pipe; the condenser inlet 14 of the heat pump unit 1 is connected to the outlet of the fourteenth valve 6-14 via at least one connecting pipe; and the inlet of the fourteenth valve 6-14 is connected to the fifteenth valve via at least one connecting pipe. The inlet of valve 6-15 is connected to the outlet of the load-side circulating pump 5. The inlet of the load-side circulating pump 5 is connected to the outlet of the ninth valve 6-9 and the outlet of the seventh valve 6-7 via at least one connecting pipe. The inlet of the seventh valve 6-7 is connected to the inlet of the eighth valve 6-8 and the heating return water pipe a via at least one connecting pipe. The evaporator outlet 12 of the heat pump unit 1 is connected to the inlet of the evaporator-side circulating pump 4 via at least one connecting pipe. The outlet of the evaporator-side circulating pump 4 is connected to the inlet of the buried pipe heat exchanger 2 via at least one connecting pipe. The outlet of the sixth valve 6-6 is connected to the inlet of the sixth valve 6-6. The outlet of the sixth valve 6-6 is connected to the outlet of the fourth valve 6-4, the inlet of the solar collector 3, and the outlet of the second valve 6-2 via at least one connecting pipe. The outlet of the solar collector 3 is connected to the inlet of the first valve 6-1 and the inlet of the third valve 6-3 via at least one connecting pipe. The outlet of the third valve 6-3 is connected to the outlet of the fifth valve 6-5 and the evaporator inlet 11 of the heat pump unit 1 via at least one connecting pipe. The outlet of the buried pipe heat exchanger 2 is connected to the outlet of the fourth valve 6-4, the inlet of the solar collector 3, and the outlet of the second valve 6-2 via at least one connecting pipe. At least one connecting pipe is connected to the inlet of the fourth valve 6-4 and the inlet of the fifth valve 6-5 respectively. The outlet of the first valve 6-1 is connected to the inlet of the thirteenth valve 6-13 and the inlet of the ninth valve 6-9 respectively through at least one connecting pipe. The inlet of the second valve 6-2 is connected to the outlet of the eleventh valve 6-11 and the outlet of the twelfth valve 6-12 respectively through at least one connecting pipe. The outlet of the fifteenth valve 6-15 is connected to the inlet of the eleventh valve 6-11 and the outlet of the eighth valve 6-8 respectively through at least one connecting pipe.

[0047] Specifically, multiple connecting pipes connect the following valves: 1. First valve 6-1, 2. Second valve 6-2, 3. Third valve 6-3, 4. Fourth valve 6-4, 5. Fifth valve 6-5, 6. Sixth valve 6-6, 7. Seventh valve 6-7, 8. Eighth valve 6-8, 9. Ninth valve 6-9, 10. Tenth valve 6-10, 11. Eleventh valve 6-11, 12. Twelfth valve 6-12, 13. Thirteenth valve 6-13, 14. Fourteenth valve 6-14, 15. Evaporator-side circulating pump 4, load-side circulating pump 5, heat pump unit 1, buried pipe heat exchanger 2, and solar collector 3. By connecting, the distances between the following valves can be adjusted: first valve 6-1, second valve 6-2, third valve 6-3, fourth valve 6-4, fifth valve 6-5, sixth valve 6-6, seventh valve 6-7, eighth valve 6-8, ninth valve 6-9, tenth valve 6-10, eleventh valve 6-11, twelfth valve 6-12, thirteenth valve 6-13, fourteenth valve 6-14, fifteenth valve 6-15, evaporator-side circulation pump 4, load-side circulation pump 5, heat pump main unit 1, buried pipe heat exchanger 2, and solar collector 3.

[0048] The above-described contents can be implemented individually or in combination in various ways, and all such variations are within the protection scope of this utility model.

[0049] It should be noted that in the description of this application, the terms "upper end," "lower end," and "bottom end," indicating orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise limited, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A solar-ground source heat pump coupled energy supply system, characterized in that: The system includes a solar collector assembly, a heat pump assembly, a buried pipe heat exchange assembly, a heating water supply pipe (b) for transporting heating water, a heating return pipe (a) for transporting heating water, valve assemblies for connecting to the solar collector assembly, heat pump assembly, buried pipe heat exchange assembly, heating water supply pipe (b), and heating return pipe (a), and controllers for controlling the solar collector assembly, heat pump assembly, buried pipe heat exchange assembly, and valve assemblies respectively. The controllers control the valve assemblies to perform a first preset operation, causing the heating return water to enter the solar collector assembly for heating; the controllers control the valve assemblies to perform a second preset operation, causing the heating return water to sequentially enter the heat pump assembly and the solar collector assembly for heating; the controllers control the valve assemblies to perform a third preset operation, causing a portion of the heating return water... The water flows into the heat pump assembly for heating, and another portion flows into the solar collector assembly for heating. The two portions of return water are mixed for heating purposes. The controller controls the valve assembly to perform a fourth preset operation, causing the heating return water to sequentially flow into the solar collector assembly and the heat pump assembly for heating. The controller controls the valve assembly to perform a fifth preset operation, causing the water from the heat pump assembly to sequentially flow into the buried pipe heat exchange assembly and the solar collector assembly for heating. The controller controls the valve assembly to perform a sixth preset operation, causing a portion of the water from the heat pump assembly to flow into the buried pipe heat exchange assembly for heating, and another portion to flow into the solar collector assembly for heating. The controller controls the valve assembly to perform a seventh preset operation, causing the solar collector assembly, the heat pump assembly, and the buried pipe heat exchange assembly to be connected in series to supplement the soil with heat.

2. The energy supply system coupled with a solar ground source heat pump as described in claim 1, characterized in that: It also includes a first temperature detection structure for detecting the temperature of the heating return water in the heating return water pipe a, a second temperature detection structure for detecting the temperature of the heating supply water in the heating supply water pipe b, the solar collector assembly includes a solar collector (3) and a third temperature detection structure for detecting the outlet water temperature of the solar collector (3), the heat pump assembly includes a heat pump host (1) and a third temperature detection structure, the heat pump host (1) includes a condenser and an evaporator, and the third temperature detection structure is used to detect the inlet temperature of the evaporator; the buried pipe heat exchange assembly includes a buried pipe heat exchanger (2), a fourth temperature detection structure for detecting the outlet water temperature of the buried pipe heat exchanger (2) and a fifth temperature detection structure for detecting the soil temperature.

3. The energy supply system coupled with a solar ground source heat pump as described in claim 2, characterized in that: The valve assembly includes a first valve (6-1), a second valve (6-2), a third valve (6-3), a fourth valve (6-4), a fifth valve (6-5), a sixth valve (6-6), a seventh valve (6-7), an eighth valve (6-8), a ninth valve (6-9), a tenth valve (6-10), an eleventh valve (6-11), a twelfth valve (6-12), a thirteenth valve (6-13), a fourteenth valve (6-14), a fifteenth valve (6-15), an evaporator-side circulation pump (4), and a load-side circulation pump (5); the condenser outlet (13) of the heat pump main unit (1) is connected to the tenth valve (6-1) The inlet of valve 0) and the inlet of valve 12 (6-12) are connected. The outlet of valve 10 (6-10) is connected to the outlet of valve 13 (6-13) and heating water supply pipe b. The condenser inlet (14) of the heat pump host (1) and the outlet of valve 14 (6-14) are connected. The inlet of valve 14 (6-14) is connected to the inlet of valve 15 (6-15) and the outlet of the load-side circulation pump (5). The inlet of the load-side circulation pump (5) is connected to the outlet of valve 9 (6-9) and the outlet of valve 7 (6-7). The inlet of valve 7 (6-7) is connected to the outlet of valve 8 (6-10) and the outlet of valve 9 (6-12). 8) The inlet and heating return water pipe a) are connected. The evaporator outlet (12) of the heat pump host (1) is connected to the inlet of the evaporator-side circulation pump (4). The outlet of the evaporator-side circulation pump (4) is connected to the inlet of the buried pipe heat exchanger (2) and the inlet of the sixth valve (6-6). The outlet of the sixth valve (6-6) is connected to the outlet of the fourth valve (6-4), the inlet of the solar collector (3), and the outlet of the second valve (6-2). The outlet of the solar collector (3) is connected to the inlet of the first valve (6-1) and the inlet of the third valve (6-3). The outlet of the third valve (6-3) is connected to the fifth valve. The outlet of valve (6-5) is connected to the evaporator inlet (11) of the heat pump host (1). The outlet of the buried pipe heat exchanger (2) is connected to the inlet of the fourth valve (6-4) and the inlet of the fifth valve (6-5). The outlet of the first valve (6-1) is connected to the inlet of the thirteenth valve (6-13) and the inlet of the ninth valve (6-9). The inlet of the second valve (6-2) is connected to the outlet of the eleventh valve (6-11) and the outlet of the twelfth valve (6-12). The outlet of the fifteenth valve (6-15) is connected to the inlet of the eleventh valve (6-11) and the outlet of the eighth valve (6-8).

4. The energy supply system coupled with a solar ground source heat pump as described in claim 2, characterized in that: It also includes a first alarm, the controller of which is used to control the first alarm to sound an alarm when the outlet water temperature of the solar collector is higher than the heating water supply temperature.

5. A solar-ground source heat pump coupled energy supply system as described in claim 2 or 4, characterized in that: It also includes a second alarm, the controller being used to control the second alarm to sound an alarm when the outlet water temperature of the solar collector is lower than the heating target temperature and the difference between the outlet water temperature of the solar collector and the heating target temperature is a first preset value.

6. A solar-ground source heat pump coupled energy supply system as described in claim 2 or 4, characterized in that: It also includes a third alarm, the controller of which is used to control the third alarm to sound an alarm when the outlet water temperature of the solar collector is higher than the heating return water temperature and the outlet water temperature of the solar collector is lower than the heating supply water temperature.

7. A solar-ground source heat pump coupled energy supply system as described in claim 2 or 4, characterized in that: It also includes a fourth alarm, the controller of which is used to control the fourth alarm to sound an alarm when the outlet water temperature of the solar collector is lower than the heating return water temperature and the outlet water temperature of the solar collector is higher than the evaporator inlet temperature.

8. A solar-ground source heat pump coupled energy supply system as described in claim 2 or 4, characterized in that: It also includes a fifth alarm, the controller of which is used to control the fifth alarm to sound an alarm when the difference between the outlet water temperature of the solar collector and the outlet water temperature of the buried pipe heat exchanger is a second preset value.

9. A solar-ground source heat pump coupled energy supply system as described in claim 2 or 4, characterized in that: It also includes a sixth alarm, which the controller uses to activate when the soil temperature is below a third preset value.

10. The energy supply system coupled with a solar ground source heat pump as described in claim 3, characterized in that: The valve assembly also includes multiple connecting pipes; the condenser outlet (13) of the heat pump unit (1) is connected to the inlet of the tenth valve (6-10) and the inlet of the twelfth valve (6-12) via at least one connecting pipe, the outlet of the tenth valve (6-10) is connected to the outlet of the thirteenth valve (6-13) and the heating water supply pipe b via at least one connecting pipe, the condenser inlet (14) of the heat pump unit (1) is connected to the outlet of the fourteenth valve (6-14) via at least one connecting pipe, and the inlet of the fourteenth valve (6-14) is connected to the fifteenth valve (6-12) via at least one connecting pipe. The inlet of the heat pump unit (1) is connected to the outlet of the load-side circulating pump (5). The inlet of the load-side circulating pump (5) is connected to the outlet of the ninth valve (6-9) and the outlet of the seventh valve (6-7) through at least one connecting pipe. The inlet of the seventh valve (6-7) is connected to the inlet of the eighth valve (6-8) and the heating return water pipe a through at least one connecting pipe. The evaporator outlet (12) of the heat pump unit (1) is connected to the inlet of the evaporator-side circulating pump (4) through at least one connecting pipe. The outlet of the evaporator-side circulating pump (4) is connected to the inlet of the buried pipe heat exchanger (2) through at least one connecting pipe. The inlet of the sixth valve (6-6) is connected, and the outlet of the sixth valve (6-6) is connected to the outlet of the fourth valve (6-4), the inlet of the solar collector (3), and the outlet of the second valve (6-2) through at least one connecting pipe. The outlet of the solar collector (3) is connected to the inlet of the first valve (6-1) and the inlet of the third valve (6-3) through at least one connecting pipe. The outlet of the third valve (6-3) is connected to the outlet of the fifth valve (6-5) and the evaporator inlet (11) of the heat pump host (1) through at least one connecting pipe. The outlet of the buried pipe heat exchanger (2) is connected to the outlet of the fourth valve (6-4), the inlet of the solar collector (3), and the outlet of the second valve (6-2) through at least one connecting pipe. The valve is connected to the inlet of the fourth valve (6-4) and the inlet of the fifth valve (6-5) via at least one connecting pipe. The outlet of the first valve (6-1) is connected to the inlet of the thirteenth valve (6-13) and the inlet of the ninth valve (6-9) via at least one connecting pipe. The inlet of the second valve (6-2) is connected to the outlet of the eleventh valve (6-11) and the outlet of the twelfth valve (6-12) via at least one connecting pipe. The outlet of the fifteenth valve (6-15) is connected to the inlet of the eleventh valve (6-11) and the outlet of the eighth valve (6-8) via at least one connecting pipe.

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