CN205919555U - Solar energy earth source heat pump coupling energy supply system with two ground pipe laying crowd - Google Patents

Abstract

The utility model relates to a solar-ground source heat pump coupled energy supply system with double buried pipe groups, which is characterized in that the energy supply system includes a solar heat collector, a heat storage tank, a ground source heat pump unit, and No. 1 buried pipe Group, No. 2 buried pipe group, building terminal device, heat collecting circulating water pump, heat storage circulating water pump, ground source side circulating water pump, No. 1 heat storage control valve, No. 2 heat storage control valve, No. 1 ground source side control valve , No. 2 ground source side control valve, No. 1 pipe group flow regulating valve, No. 2 pipe group flow regulating valve, No. 1 pipe group heat meter and No. 2 pipe group heat meter; The water tank and the heat collecting circulating water pump are connected by pipelines, that is, the heat collecting cycle, and the hot water generated by solar energy is collected; the hot water outlet of the heat storage tank is connected with the No. 1 heat storage control valve and the heat storage circulating water pump in sequence. , No. 1 buried pipe group, No. 2 heat storage control valve, and the return end of the heat storage tank are connected by pipelines to form a heat storage cycle.

Description

Solar-ground source heat pump coupled energy supply system with double buried pipe groups

technical field

The utility model belongs to the technical field of building heat supply, cooling supply and hot water supply, and specifically relates to a solar energy-ground source heat pump coupling energy supply system with double buried pipe groups.

Background technique

With the improvement of people's living standards, people's requirements for the comfort of buildings are getting higher and higher. The resulting building energy supply problem is becoming more and more serious. my country's primary energy consumption accounts for about 20% of the world's total, equivalent to about 3.62 billion tons of standard coal, and energy consumption per unit of GDP remains high. At present, my country's building energy consumption accounts for about 27% of the total energy consumption of the whole society, of which heating and cooling energy consumption accounts for about 60% of the entire building energy consumption. Therefore, reducing the heating and air conditioning energy consumption of buildings is the key to building energy conservation. focus.

The solar ground source heat pump system uses solar energy and shallow geothermal energy to heat and cool buildings, which has significant advantages in energy saving and emission reduction. Nowadays, ground source heat pumps have been widely used, but there are still some problems in their operation, the most prominent one is the ground temperature balance problem in areas with uneven cooling and heating loads. When the heat gain in winter is greater than the heat release in summer, the solar system can be added to increase the ground temperature by sharing the load or directly storing heat underground.

Ordinary solar ground source heat pump systems are usually in the form of a single buried pipe group or a hot water storage tank as the heat source for the evaporator of the unit. The long-term operation of the system will easily cause the ground temperature to rise or fall, which will affect the energy efficiency of the operation. Therefore, a set of buried pipes It is difficult for the group and unit system to meet the comprehensive energy supply demand at the same time. There are also two independent buried pipe groups with two heat pump units for dual-system heating mode (ZL201110146044.1). Although the problem of unbalanced heating is solved, the system uses two units to provide heat separately. The operating load deviates greatly from the rated load, the energy efficiency of the unit is affected, and the investment is large. The utility model combines two underground pipe groups on the ground source side of the ground source heat pump as the heat source of the unit, which saves the solar energy auxiliary ground source heat pump unit, can improve the energy efficiency of the system operation, and is more suitable for buildings with little change in load in the application.

Utility model content

Aiming at the deficiencies of existing solar ground source heat pump systems, the technical problem to be solved by this utility model is to provide a solar-ground source heat pump coupling energy supply system with double buried pipe groups, which can be used for building cooling , heating, and hot water supply; the utility model is superior to the common solar-assisted ground source heat pump system in that this system connects two underground pipe groups as a heat source for a heat pump unit, which can make full use of solar heat storage and flexibly Adjusting the ground temperature balance can realize efficient operation of cooling in summer and heating in winter; in addition, the added control components of the system can adjust the flow of the two buried pipe groups according to the actual heat load and soil temperature, thereby adjusting the distribution of heat intake , can also realize the conversion between different heating modes. The use of solar energy in the heating season can adopt two schemes, that is, solar hot water is directly supplied to some building ends in the non-heating season (direct system, that is, embodiment 2) or heat the return water of the heat pump unit (indirect system, that is, embodiment 2) 1) to realize inter-seasonal heat storage in non-heating seasons of solar energy and direct heating in heating seasons.

The technical solution adopted by the utility model to solve the technical problem of the energy supply system is to provide a solar energy-ground source heat pump coupling energy supply system with double buried pipe groups, which is characterized in that the energy supply system includes a solar collector, Hot water storage tank, ground source heat pump unit, No. 1 buried pipe group, No. 2 buried pipe group, building terminal device, heat collecting circulating water pump, heat storage circulating water pump, ground source side circulating water pump, No. 1 heat storage control valve , No. 2 heat storage control valve, No. 1 ground source side control valve, No. 2 ground source side control valve, No. 1 pipe group flow regulating valve, No. 2 pipe group flow regulating valve, No. 1 pipe group heat meter and No. 2 pipe group group heat meter;

The solar heat collector is sequentially connected with the heat storage tank and the heat collection circulating water pump through pipelines, that is, the heat collection cycle, and collects hot water generated by solar energy; the hot water outlet of the heat storage tank is connected with the No. 1 heat storage control valve, heat storage circulating water pump, No. 1 buried pipe group, No. 2 heat storage control valve, and the return end of the heat storage tank are connected by pipelines to form a heat storage cycle;

The outlet side of the ground source side of the ground source heat pump unit is respectively connected to the No. 1 pipe group flow regulating valve and the No. 2 pipe group flow regulating valve; the No. 1 pipe group flow regulating valve is connected to the No. 1 ground source in sequence side control valve, No. 1 underground pipe group, No. 2 ground source side control valve and No. 1 pipe group heat meter, and then connected to the ground source side return water main; The No. 2 buried pipe group is connected to the heat meter of the No. 2 pipe group, and then connected to the ground source side return water main pipe; the ground source side return water main pipe is connected to the ground source side circulating water pump and then connected to the ground source side inflow end of the ground source heat pump unit , constituting the ground-source side circulation loop of the heat pump unit;

The terminal device of the building is connected with the terminal side of the ground source heat pump unit and the hot water outflow end of the hot water storage tank respectively, and supplies heat to the terminal device of the building through the ground source heat pump unit and the hot water storage tank.

Compared with the prior art, the beneficial effects of the utility model are:

(1) The utility model adopts double buried pipe groups as the heat source of the ground source heat pump unit, and couples the solar energy cross-seasonal heat storage technology with the ground source heat pump technology to solve the problem of solar energy cross-seasonal heat storage and heat storage in the single ground pipe group The contradiction between the operation of the ground source heat pump system also realizes the heat balance problem of the soil of the ground source heat pump buried pipe group, and ensures the long-term, stable and efficient operation of the system.

(2) Single-unit heat supply reduces the initial investment of the system. Compared with the applicant's prior patent ZL201110146044.1, the utility model adopts a ground source heat pump unit for heating, which reduces the initial investment of the system.

(3) Optimize control and make full use of solar energy. The utility model judges the actual load and ground temperature according to the heat meters installed on the ground source side and the end side of the ground source heat pump unit, and adopts an automatic control valve and a flow regulating valve to change the energy supply mode and control the flow distribution of the pipeline, ensuring that the ground Under the condition of soil balance in the pipe group, solar heating is given priority, making full use of solar energy and reducing the power consumption of heat pump units.

(4) Increase the load ratio of the heating condition of the heat pump unit to improve the energy efficiency of the system operation. Compared with the applicant's prior patent ZL201110146044.1, the ground source heat pump unit of the utility model bears the heat load of the entire building, increases the operating load ratio of the unit, and the maximum operating heat load increases from 67% of the previous heat load to the heat load of the entire building. 100% of the load, which greatly reduces the operating conditions of the "big horse-drawn trolley" of the heat pump unit, can improve the operating energy efficiency of the unit and the system, and significantly reduce the system operating cost.

The utility model is an improvement on the applicant's previous patent ZL201110146044.1. In the original patent, two underground pipe groups are used, corresponding to two ground source heat pump units. The larger unit is responsible for the entire cooling and cooling of the building. Most of the heat supply, the small unit and the solar system are coupled to be responsible for the other part of the heat supply. The two tube groups have nothing to do with each other and are independent of each other. In actual operation, the applicant found that the system has a long period of extremely low In the state of load ratio, small ground source heat pump units and solar energy are used to heat the entire building, which can reduce energy consumption during operation, while for conditions of extremely low load ratio that do not exist for a long period of time, the energy efficiency of the original system is relatively low. Low cost, high investment cost, the functions of small ground source heat pump units can be completely replaced by large units. However, this application cancels the original small ground source heat pump unit coupled with solar energy. The large unit still uses the original large buried pipe group to be responsible for the cooling of the entire building during the cooling season, but in the heating season, the two pipe groups Connected together, at the same time as the heat source of the ground source heat pump unit, heating the entire building. During the non-heating season, the solar thermal collection system stores the collected solar thermal energy in a small group of buried pipes. heating. According to the simulation results of the two systems, the energy supply system of this application has significantly improved the operation performance compared with the previous patent, and can save about 10% of the operation power consumption in each heating season. At the same time, it saves a small The heat pump unit reduces the initial investment of the energy supply system, and the saved initial investment accounts for 15%-20% of the total investment in the equipment room.

Description of drawings

Fig. 1 is a schematic composition diagram of Embodiment 1 of a solar-ground source heat pump coupling energy supply system with double buried pipe groups of the present invention.

Fig. 2 is a composition schematic diagram of Embodiment 2 of the solar-ground source heat pump coupled energy supply system with double buried pipe groups of the present invention.

In the figure, 1- solar collector, 2- hot water storage tank, 3- ground source heat pump unit (or unit), No. 41-1 buried pipe group, No. 42-2 buried pipe group, 5- building end Device, Building No. 51-1 Terminal, Building No. 52-2 Terminal, 61-Collector Circulating Water Pump, 62-Heat Storage Circulating Water Pump, 63-Ground Source Side Circulating Water Pump, 64-Terminal Side Circulating Water Pump, 65-Solar Heating Circulating water pump, No. 711-1 heat storage control valve, No. 712-2 heat storage control valve, No. 721-1 solar heating control valve, 722-2 solar heating control valve, No. 731-1 ground source side control valve , No. 732-2 ground source side control valve, No. 741-1 terminal side control valve, 742-2 terminal side control valve, 743-3 terminal side control valve, 75-pressure control valve, 81-1 pipe group Flow regulating valve, No. 82-2 pipe group flow regulating valve, 83-end flow regulating valve, No. 91-1 pipe group heat meter, No. 92-2 pipe group heat meter, 93-unit end heat meter, 94-solar power supply Heat meter, 10-domestic hot water heat exchange coil, 11-solar heating heat exchange coil.

detailed description

The utility model is further described in detail below in conjunction with the embodiments and accompanying drawings, but it is not used as a limitation to the protection scope of the claims of the present application.

The solar energy-ground source heat pump coupled energy supply system (abbreviated as energy supply system, see Fig. 1-2) of the utility model with double buried pipe groups includes a solar heat collector 1, a heat storage tank 2, and a ground source heat pump unit 3 ( Unit for short), No. 1 buried pipe group 41, No. 2 buried pipe group 42, building terminal device 5, heat collecting circulating water pump 61, heat storage circulating water pump 62, ground source side circulating water pump 63, No. 1 heat storage control valve 711, No. 2 heat storage control valve 712, No. 1 ground source side control valve 731, No. 2 ground source side control valve 732, No. 1 pipe group flow regulating valve 81, No. 2 pipe group flow regulating valve 82, No. 1 pipe group Heat meter 91 and No. 2 pipe group heat meter 92;

The solar heat collector 1 is connected with the heat storage tank 2 and the heat collection circulating water pump 61 in turn through pipelines, that is, the heat collection cycle, and collects hot water generated by solar energy; the hot water from the heat storage tank 2 flows out The end is connected with the No. 1 heat storage control valve 711, the heat storage circulating water pump 62, the No. 1 buried pipe group 41, the No. 2 heat storage control valve 712, and the return end of the hot water storage tank 2 through pipelines to form a Heat storage cycle;

The ground source side outflow end of the ground source heat pump unit 3 is respectively connected to the flow regulating valve 81 of the No. 1 pipe group and the flow regulating valve 82 of the No. 2 pipe group respectively; the flow regulating valve 81 of the No. 1 pipe group is connected to the No. 1 ground source side control valve 731, No. 1 buried pipe group 41, No. 2 ground source side control valve 732 and No. 1 pipe group heat meter 91 are connected, and then connected to the ground source side return water main pipe; the flow rate of No. 2 pipe group The regulating valve 82 is connected to the No. 2 underground pipe group 42 and the No. 2 pipe group heat meter 92 in sequence through the pipeline, and then connected to the ground source side return water main pipe; the ground source side return water main pipe is connected to the ground source side circulating water pump 63 It is connected with the ground source side inflow end of the ground source heat pump unit 3 to form a ground source side circulation loop of the heat pump unit;

The building terminal device 5 is connected to the end side of the ground source heat pump unit 3 and the hot water outlet of the hot water storage tank 2 respectively, and supplies heat to the building terminal device 5 through the ground source heat pump unit 3 and the hot water storage tank 2 .

A further feature of the utility model is that a solar heat supply and heat exchange coil 11 is arranged in the hot water storage tank 2, and the inflow end of the solar heat supply and heat exchange coil 11 is connected to the return water main pipe of the ground source heat pump unit 3, and the solar energy The hot water outflow end of the heating heat exchange coil 11 is connected with the solar heating circulating water pump 65, the No. 1 solar heating control valve 721, and the solar heating heat meter 94 by pipelines, and then connected to the ground source heat pump unit 3 on the end-side return water main pipe; arranged between the two interfaces of the end-side return water main pipe connected to the inflow end of the solar heating heat exchange coil 11 and the hot water outflow end of the solar heat supply heat exchange coil 11 There is a terminal flow regulating valve 83; the outlet port of the terminal side of the ground source heat pump unit 3 is sequentially connected with the unit terminal heat meter 93, the building terminal device 5, the unit terminal flow regulating valve 83, the terminal side circulating water pump 64 and the terminal side of the unit 3 The inlet pipe is connected.

The utility model is further characterized in that the building end device 5 is divided into No. 1 building end 51 and No. 2 building end 52, and the hot water outlet of the heat storage tank 2 is sequentially connected with the solar heating circulating water pump 65, No. 1 solar heating control valve 721, No. 1 building end 51, No. 2 solar heating control valve 722, pressure control valve 75, and the pipeline at the return end of the hot water storage tank 2 are connected to form a direct solar heating cycle (or solar heating cycle); the outlet port at the end of the unit is sequentially connected with the heat meter 93 at the end of the unit, the main water supply pipe at the end of No. 2 building 52, the control valve 741 at the end of No. 1, the end 51 at the end of building No. 1, and the control valve 742 at the end of No. 2 , No. 2 building terminal 52 main return water pipe, No. 3 terminal side control valve 743, terminal side circulating water pump 64, and heat pump unit terminal side inflow pipe are connected to form a heat pump unit heating cycle (or ground source heat pump heating cycle) , and then achieve the purpose of supplying heat to the building terminal device 5 through the unit 3 and the hot water storage tank 2 .

A further feature of the utility model is that domestic hot water heat exchange coils 10 are arranged in the hot water storage tank 2, and are connected to the building through pipelines.

The working principle and process of the utility model are: in the non-heating season, the hot water in the heat storage tank stores heat in the soil of No. 1 buried pipe group through the heat storage cycle. During the heat supply season, when the hot water in the hot water storage tank reaches the temperature requirement, it can directly supply heat to the building. The hot water in the hot water storage tank can be supplied to different building terminal devices separately from the hot water generated by the ground source heat pump unit, or the solar energy collected in winter can be used by heating the return water of the heat pump unit with the hot water in the hot water storage tank. When the method of heating the return water is adopted, all or part of the return water of the unit passes through the coil in the heat storage tank to exchange heat with the hot water in the heat storage tank, and the return water flow back to the heat storage tank to participate in the heat exchange is controlled by the unit installed in the unit. The terminal flow regulating valve 83 on the terminal backwater main pipe is controlled.

The ground source side outlet of the ground source heat pump unit described in the energy supply system of the utility model is respectively connected to the No. 1 pipe group flow regulating valve 81 corresponding to the No. 1 buried pipe group 41 and the No. The group flow regulating valve 82 is connected to control the distribution ratio of heat intake through flow regulation. The adjustment of the flow regulating valve is determined according to the return water temperature collected by the heat meters 91 and 92 installed on the return water pipes of the two pipe groups, and the flow adjustment result can be displayed by the flow collected by the heat meters.

The function of the control valve in the energy supply system of the utility model is to manage the operation mode of the control system; the function of the control valve is to adjust the flow of each branch of the buried pipe heat exchanger; the function of the pressure control valve is Control the pressure of the return water during the direct heating cycle of solar energy to avoid the recharge of the circulating water at the end of the building to the heat storage tank.

The heat supply load of the energy supply system described in the utility model is jointly borne by solar energy and ground source heat pump, and the heat source of the evaporator of the ground source heat pump unit is jointly borne by No. 1 buried pipe group and No. 2 buried pipe group, which can realize various heat supply model. The heat produced by the solar collector 1 in the heating season is given priority to heating the building, and the heat generated in the non-heating season is temporarily stored in the hot water storage tank 2 and then sent to the No. 1 underground pipe group 41 to realize storage in the soil. In the heat supply season of the same year, unit 3 takes priority in getting heat from No. 1 buried pipe group 41, making full use of the heat stored by solar energy. The energy supply system is designed to meet the requirements of all cooling and heating loads of the building. Under the premise that the heat output of the No. 2 buried pipe group in the cooling season is equal to the heat taken in the heating season, the excess heat load is provided by the No. 1 buried pipe group. The heat stored in the group and the solar energy in the heating season are borne. Domestic hot water heat exchange coils are also arranged in the hot water storage tank, which are connected to the building through pipelines to supply domestic water throughout the year, so the area of the solar collector 1 can be appropriately increased, and the area of the solar collector 1 The design is designed according to the local solar radiation intensity of the building and the building load to meet part of the building's heat load and domestic hot water needs.

The main function of the unit 3 in the utility model is to bear the cooling/heating load of the whole building. The selection of the unit 3 is based on the summer cooling load, and the winter heat load is checked at the same time, and the No. 1 is further determined according to the actual heat load and soil temperature. The heat supply ratio of the buried pipe group 41 and the No. 2 buried pipe group 42. The specific implementation process is as follows: during the heating season, No. 1 and No. 2 buried pipe groups 41 and 42 take heat from the soil, and the soil is used as a low-temperature heat source for the unit. After passing through the unit 3, high-temperature hot water is provided for the room through the building terminal device 5. heat to meet the heating needs of the building. According to the heat meter 91 of No. 1 pipe group and the heat meter 92 of No. 2 pipe group, the outlet water temperature and soil temperature of No. 1 buried pipe group 41 and No. 2 buried pipe group 42 can be judged, and then the flow adjustment of No. 1 pipe group can be adjusted. Valve 81 and No. 2 pipe group flow regulating valve 82 are used to adjust the heat distribution ratio of unit 3 from No. 1 buried pipe group 41 and No. 2 buried pipe group 42, so as to realize the utilization of solar energy as much as possible and ensure that No. 2 buried pipe group The geothermal balance of the pipe group. Among them, No. 1 buried pipe group only participates in heating, and there is solar heat storage in the non-heating season. It does not need to consider its ground temperature balance. The heat extraction of No. 1 buried pipe group can be controlled according to the ground temperature monitoring of No. 1 buried pipe group. The No. 2 buried pipe group participates in the heat discharge of the ground source heat pump unit in summer and the heat acquisition of the ground source heat pump unit in winter. It is necessary to ensure the balance between heat removal and heat acquisition. The No. 1 buried pipe group is a small pipe group, and its function is to For the adjustment of heat storage and the inter-seasonal heat storage of solar energy, the No. 2 underground pipe group is the main group of the energy supply system, which is much larger than the No. 1 pipe group.

Example 1

The solar-ground source heat pump coupled energy supply system with double buried pipe groups in this embodiment (see Figure 1) includes a solar heat collector 1, a hot water storage tank 2, a ground source heat pump unit 3, and No. 1 buried pipe group 41 , No. 2 buried pipe group 42, building terminal device 5, heat collecting circulating water pump 61, heat storage circulating water pump 62, ground source side circulating water pump 63, terminal side circulating water pump 64, solar heating circulating water pump 65, No. 1 heat storage Control valve 711, No. 2 heat storage control valve 712, No. 1 solar heating control valve 721, No. 2 solar heating control valve 722, No. 1 ground source side control valve 731, No. 2 ground source side control valve 732, No. 1 Pipe group flow regulating valve 81, No. 2 pipe group flow regulating valve 82, terminal flow regulating valve 83, No. 1 pipe group heat meter 91, No. 2 pipe group heat meter 92, unit end heat meter 93, solar heating heat meter 94 , domestic hot water heat exchange coil 10, solar heat supply heat exchange coil 11;

The solar heat collector 1 is connected with the heat storage tank 2 and the heat collection circulating water pump 61 in turn through pipelines, that is, the heat collection cycle, and collects hot water generated by solar energy; the hot water from the heat storage tank 2 flows out The end is connected with the No. 1 heat storage control valve 711, the heat storage circulating water pump 62, the No. 1 buried pipe group 41, the No. 2 heat storage control valve 712, and the return end of the hot water storage tank 2 through pipelines to form a Heat storage cycle;

The ground source side outflow end of the ground source heat pump unit 3 is respectively connected to the flow regulating valve 81 of the No. 1 pipe group and the flow regulating valve 82 of the No. 2 pipe group respectively; the flow regulating valve 81 of the No. 1 pipe group is connected to the No. 1 ground source side control valve 731, No. 1 buried pipe group 41, No. 2 ground source side control valve 732 and No. 1 pipe group heat meter 91 are connected, and then connected to the ground source side return water main pipe; the flow rate of No. 2 pipe group The regulating valve 82 is connected to the No. 2 underground pipe group 42 and the No. 2 pipe group heat meter 92 in sequence through the pipeline, and then connected to the ground source side return water main pipe; the ground source side return water main pipe is connected to the ground source side circulating water pump 63 It is connected with the ground source side inflow end of the ground source heat pump unit 3 to form a ground source side circulation loop of the heat pump unit;

The building terminal device 5 is connected to the end side of the ground source heat pump unit 3 and the solar heat supply and heat exchange coil 11 arranged in the water storage tank 2 respectively, and the ground source heat pump unit 3 and the water storage tank 2 are connected to the building. The end device 5 supplies heat.

The heat storage tank 2 is arranged with a solar heat supply heat exchange coil 11, the inflow end of the solar heat supply heat exchange coil 11 is connected to the main return water pipe of the ground source heat pump unit 3, and the solar heat supply heat exchange coil 11 The hot water outlet end is connected with the solar heating circulating water pump 65, the No. 1 solar heating control valve 721, and the solar heating heat meter 94 by pipelines, and then connected to the terminal side return water main pipe of the ground source heat pump unit 3 Above: a terminal flow regulating valve 83 is arranged between the two interfaces of the end-side return water main pipe connected to the inflow end of the solar heat supply heat exchange coil 11 and the hot water outflow end of the solar heat supply heat exchange coil 11; The outlet of the end side of the ground source heat pump unit 3 is sequentially connected with the unit end heat meter 93, the building end device 5, the unit end flow regulating valve 83, the end side circulating water pump 64 and the end side inlet pipe of the unit 3.

In addition to the solar heat supply heat exchange coil 11, the hot water storage tank 2 is also arranged with a domestic hot water heat exchange coil 10, which can heat tap water to meet the hot water supply of the building throughout the year.

The No. 1 buried pipe group 41 described in the energy supply system of this embodiment is not only used as a cross-season heat storage body for solar energy, but also serves as a heat source for the unit 3 during the heating season. Multiple groups of buried pipes in No. 1 buried pipe group 41 are connected in parallel and then connected in series. When storing heat, hot water first passes through the inner buried pipe group and gradually flows to the outside, and the direction of flow is opposite when extracting heat; The buried pipe group 42 is connected in parallel between the buried pipes, and is used for heat removal in the cold season to meet the use of unit 3. It is used for heat extraction in the hot season and meets the use of unit 3 at the same time as No. 1 buried pipe group 41. This system is designed according to the principle that the heat exhausted to the No. 2 buried pipe group 42 in the cooling season is equal to the heat taken from the No. 2 buried pipe group 42 in the heating season, and the excess heat load is stored by the No. 1 buried pipe group 41 Heat and solar heating assumed.

The specific operation control strategy of the solar-ground source heat pump coupling energy supply system with double buried pipe groups in this embodiment is: the No. 1 buried pipe group 41 and the ground source heat pump unit 3 and the No. 2 buried pipe group 42 The connection is disconnected by the control valves 731 and 732 on the ground source side, the two buried pipe groups are independent of each other, and the flow regulating valve 82 of the No. 2 pipe group is opened to the maximum. The solar heating control valves 721 and 722 are closed, the solar heating circulation pipeline is disconnected from the terminal circulation loop on the ground source side, and the terminal flow regulating valve 83 is opened to the maximum. No. 2 underground pipe group 42, No. 2 pipe group flow regulating valve 82, unit 3, ground source side circulating water pump 63, terminal side circulating water pump 64, building terminal device 5, terminal flow regulating valve 83 and connecting pipelines form cooling supply cycle, bear all the cooling load of the building, and the No. 2 buried pipe group 42 is used as the cold source of the ground source heat pump unit 3 .

In the non-heat supply season, the heat storage tank 2, the heat storage circulating water pump 62, the No. 1 buried pipe group 41, the heat storage control valves 721 and 722 and the connecting pipelines form a heat storage cycle, and the No. 1 buried pipe group 41 used to store solar energy.

In the heating season, the building heat load is jointly borne by solar energy and ground source heat pump, and the heat source of the evaporator of ground source heat pump unit 3 is jointly borne by No. 1 buried pipe group 41 and No. 2 buried pipe group 42; Participate in the building heating process when required.

In the heating season, the end-side interconnection is realized through the opening and closing of the terminal control valve, water pump, heat pump unit and other mechanisms. Three heating modes can be realized according to the different heat loads: solar heating undertakes all heat loads, and the unit undertakes all heat loads. Load, solar energy combined with ground source heat pump bear all the heat load. When the heat load is small and the solar radiation is large, such as the initial and final stages of heating, when solar heating bears all the heat load, the ground source heat pump unit 3 and the ground source side circulating water pump 63 stop running, and the end side circulating water pump 64 and solar heating Circulating water pump 65 pushes the return water at the end side together to pass through the heat storage tank 2 to heat up and then send it to the building end device 5 to supply heat for the building. The No. 1 and No. 2 solar heating control valves 721 and 722 are opened; when the temperature of the heat storage tank When the heating requirements are not met, the heat pump unit bears all the heat load: the solar heating circulating water pump 65, the No. 1 solar heating control valve 721 and the solar heating control valve 722 are closed, the terminal side circulating water pump 64 is turned on, and the terminal side flow regulating valve 83 to the maximum; when the heat load is large and the temperature of the hot water storage tank reaches the temperature requirement, the solar energy combined with the ground source heat pump bears the entire heat load, and the solar heating cycle and the ground source heat pump heating cycle are all turned on: the end side cycle The water pump 64 and the solar heating circulating water pump 65 are turned on, and No. 1 and No. 2 solar heating control valves 721 and 722 are turned on, and the flow of the solar heating circulation loop is adjusted by adjusting the opening of the terminal flow regulating valve 83 .

In the heat supply season, the interconnection of the ground source side is realized through the opening and closing of the ground source side control valve, water pump, flow regulating valve and other mechanisms. When the heat pump unit supplies heat, the No. 1 buried pipe group 41 and the No. 2 buried pipe group 42 can be used as heat sources for the evaporator of the heat pump unit at the same time, and both buried pipe groups are connected to the main pipe on the ground source side of the heat pump unit. When the flow is adjusted by the flow regulating valve, when the return water is mixed with the water supply of two sets of buried pipe groups with different temperatures, it is connected to the inflow end of the ground source side of the heat pump unit, so as to realize the heat distribution of No. 1 and No. 2 buried pipe groups. By controlling the flow regulating valve of the No. 1 pipe group and the No. 2 pipe group flow regulating valve, two modes of heat supply by the ground source heat pump unit of the No. 2 buried pipe group and the heat supply of the double buried pipe group ground source heat pump unit can be realized. When the No. 2 underground pipe group ground source heat pump unit is in heating mode: Unit 3 is turned on, the No. 1 ground source side control valve 731 and the No. 2 ground source side control valve 732 are closed, the No. The source side circulating water pump 63; when the ground source heat pump unit of the double ground buried pipe group is in the heating mode: the unit 3 is turned on, the No. 1 ground source side control valve 731 and the No. 2 ground source side control valve 732 are turned on, and the ground source side circulating water pump 63 is turned on , adjust the opening of the No. 1 pipe group flow regulating valve and the No. 2 pipe group flow regulating valve to adjust the proportion of heat taken by the two pipe groups.

Example 2

The solar-ground source heat pump coupled energy supply system with double buried pipe groups in this embodiment (see Figure 2) includes a solar heat collector 1, a hot water storage tank 2, a ground source heat pump unit 3, and No. 1 buried pipe group 41 , No. 2 buried pipe group 42, No. 1 building terminal 51, No. 2 building terminal device 52, heat collecting circulating water pump 61, heat storage circulating water pump 62, ground source side circulating water pump 63, terminal side circulating water pump 64, solar heating Circulating water pump 65, No. 1 heat storage control valve 711, No. 2 heat storage control valve 712, No. 1 solar heating control valve 721, No. 2 solar heating control valve 722, No. 1 ground source side control valve 731, No. 2 ground Source side control valve 732, No. 1 end side control valve 741, No. 2 end side control valve 742, No. 3 end side control valve 743, pressure control valve 75, No. 1 pipe group flow regulating valve 81, No. 2 pipe group flow adjustment Valve 82, No. 1 pipe group heat meter 91, No. 2 pipe group heat meter 92, unit end heat meter 93, solar heating heat meter 94, domestic hot water heat exchange coil 10;

The setting of the underground pipe group in this embodiment is exactly the same as that in Embodiment 1, the difference is that the ground source heat pump unit 3 and the hot water storage tank 2 provide heat for the end device of the building in different ways, and the specific connection of the end device of the building in this embodiment The relationship is: the building terminal device 5 is divided into No. 1 building terminal 51 and No. 2 building terminal 52, and the hot water outlet of the heat storage tank 2 is sequentially connected with the solar heating circulating water pump 65 and the No. 1 solar power supply. The heat control valve 721, the solar heating heat meter 94, the No. 1 building end 51, the No. 2 solar heating control valve 722, the pressure control valve 75, and the return pipe of the hot water storage tank 2 are connected to form a direct solar heating cycle Circuit: the outlet port at the end of the unit is sequentially connected with the heat meter 93 at the end of the unit, the main water supply pipe at the end of No. 2 building, the control valve 741 at the end of No. 1, the control valve at the end of No. 1 building, the control valve 742 at the end of No. 2, and the control valve at No. 2 building The return water main pipe at the end 52, the control valve 743 at the end side of No. 3, the circulating water pump 64 at the end side, and the inflow pipe at the end side of the heat pump unit are connected to form the heat supply cycle of the heat pump unit, and then realize the heat supply through the unit 3 and the heat storage tank 2. The purpose of building terminal device 5 is heating.

In this embodiment, since the heat storage tank is an open water tank, when the position of the water tank is low, the pressure in the waterway at the end of the building is much higher than the pressure of the water tank, so a pressure control valve 75 must be installed at the return water end of the heat storage tank to avoid The water irrigation problem caused by the end of the building to the water storage tank;

In this embodiment, in the non-heating season, the solar hot water is stored across seasons, and the thermal energy generated by the solar energy is stored in the soil in the No. 1 buried pipe group; in the heating season, when the temperature of the solar hot water meets the building heating When required, the hot water in the hot water storage tank is directly delivered to some building end devices to bear part of the building load. When the temperature of solar hot water does not meet the building heating requirements, the heat load of the entire building is solely borne by the ground source heat pump unit. The heat source of the ground source heat pump unit comes from the No. 1 buried pipe group and the No. 2 buried pipe group; in the cooling season, the ground source heat pump unit discharges heat to the No. 2 buried pipe group to provide the required cooling capacity for the entire building.

In this embodiment, in the heating season, the terminal side interconnection can be realized through the opening and closing of control valves, water pumps, heat pump units and other mechanisms, and three heating modes can be realized according to different heat loads: solar heating undertakes all heat loads, unit Undertake all heat loads, and solar combined ground source heat pumps bear all heat loads. When the heat load is small and the solar radiation is more, such as the initial and final stages of heating, when the solar heating bears all the heat load, the No. 1 and No. 2 solar heating control valves 721 and 722 are opened, and the No. 1 and No. 2 terminal side control valves 741 and 742 are opened, the No. 3 terminal side control valve 743 is closed, the ground source heat pump unit 3 and the ground source side circulating water pump 63 stop running, and the solar heating circulating water pump 65 pushes the hot water from the heat storage tank to be delivered to the No. 1 building terminal 51 and 2 Terminal 52 of Building No. 1 provides heat for the building; when the temperature of the heat storage tank does not meet the heating requirements, the heat pump unit assumes the entire heat load: No. 1 and No. 2 solar heating control valves 721 and 722 are closed, No. 1, No. 2 and No. 2 The control valves 741, 742 and 743 on the terminal side of No. 3 are opened, the solar heating circulating water pump 65 is stopped, and the terminal side circulating water pump 64 is started; Undertake all the heat load, the solar heating cycle and the ground source heat pump heating cycle are all turned on: the end-side circulating water pump 64 and the solar heating circulating water pump 65 are started, the No. 1 and No. 2 solar heating control valves 721 and 722 are opened, and 1 Terminal side control valves 741 and 742 of No. 2 and No. 2 are closed, and terminal side control valve 743 of No. 3 is opened. The solar heating cycle and the ground source heat pump cycle provide heat for the No. 1 building end 51 and the No. 2 building end 52 respectively.

Embodiment 1 and Embodiment 2 are two different schemes adopted when solar energy directly heats buildings. Embodiment 2 is to directly input solar hot water into some end devices of the building, and the end devices of the building need to be partitioned. However, the building terminal device in Embodiment 1 does not need to be further partitioned. The solar hot water and the return water for heating are exchanged in the heat storage tank 2 through the solar heat supply and heat exchange coil 11, and the return water of the heat pump unit is heated. This reduces the power consumption of the heat pump unit. Embodiment 1 overcomes the difficulty of connection and pressure control between the building end and the open water tank in Embodiment 2, reduces the use of pressure control valves, and does not need to partition the building end devices, which can reduce the number of control valves and the number of ends caused by partitions. For the use of the return water pipeline, only one terminal flow regulating valve can be realized. Compared with Embodiment 1, Embodiment 2 has a higher utilization rate of solar energy, but the pump consumption is also high.

The unmentioned part of the utility model is applicable to the prior art.

The above descriptions are only preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any modifications, equivalent replacements and improvements made to the above embodiments according to the utility model without departing from the content of the technical solution of the utility model all belong to the protection scope of the utility model.

Claims (4)

1. A solar energy-ground source heat pump coupled energy supply system with double buried pipe groups, characterized in that the energy supply system includes a solar collector, a hot water storage tank, a ground source heat pump unit, and No. 1 buried pipe group , No. 2 buried pipe group, building terminal device, heat collecting circulating water pump, heat storage circulating water pump, ground source side circulating water pump, No. 1 heat storage control valve, No. 2 heat storage control valve, No. 1 ground source side control valve, No. 2 ground source side control valve, No. 1 pipe group flow regulating valve, No. 2 pipe group flow regulating valve, No. 1 pipe group heat meter and No. 2 pipe group heat meter; The solar heat collector is sequentially connected with the heat storage tank and the heat collection circulating water pump through pipelines, that is, the heat collection cycle, and collects hot water generated by solar energy; the hot water outlet of the heat storage tank is connected with the No. 1 heat storage control valve, heat storage circulating water pump, No. 1 buried pipe group, No. 2 heat storage control valve, and the return end of the heat storage tank are connected by pipelines to form a heat storage cycle; The outlet side of the ground source side of the ground source heat pump unit is respectively connected to the No. 1 pipe group flow regulating valve and the No. 2 pipe group flow regulating valve; the No. 1 pipe group flow regulating valve is connected to the No. 1 ground source in sequence side control valve, No. 1 underground pipe group, No. 2 ground source side control valve and No. 1 pipe group heat meter, and then connected to the ground source side return water main; The No. 2 buried pipe group is connected to the heat meter of the No. 2 pipe group, and then connected to the ground source side return water main pipe; the ground source side return water main pipe is connected to the ground source side circulating water pump and then connected to the ground source side inflow end of the ground source heat pump unit , constituting the ground-source side circulation loop of the heat pump unit; The terminal device of the building is connected with the terminal side of the ground source heat pump unit and the hot water outflow end of the hot water storage tank respectively, and supplies heat to the terminal device of the building through the ground source heat pump unit and the hot water storage tank. 2. The solar energy-ground source heat pump coupled energy supply system with double buried pipe groups according to claim 1, characterized in that the solar heat supply and heat exchange coils are arranged in the hot water storage tank, and the solar heat supply and heat exchange coils The inflow end of the heat coil is connected to the return water main pipe of the ground source heat pump unit, and the outflow end of the solar heating heat exchange coil is connected with the solar heating circulating water pump, the No. 1 solar heating control valve, and the solar heating heat meter in sequence. It is connected by a pipeline, and then connected to the end-side return water main pipe of the ground source heat pump unit; at the end-side return pipe connected to the inflow end of the solar heating heat exchange coil and the hot water outflow end of the solar heat supply heat exchange coil A terminal flow regulating valve is arranged between the two interfaces of the main water pipe; the terminal side outlet of the ground source heat pump unit is connected with the unit terminal heat meter, the building terminal device, the unit terminal flow regulating valve, the terminal side circulating water pump and the unit terminal in sequence. The side inlet port is connected to the pipeline. 3. The solar-ground source heat pump coupled energy supply system with double buried pipe groups according to claim 1, characterized in that the building end devices are divided into No. 1 building end and No. 2 building end, and the heat storage The hot water outlet of the water tank is sequentially connected with the solar heating circulating water pump, the No. 1 solar heating control valve, the No. 1 building end, the No. 2 solar heating control valve, and the return end pipeline of the hot water storage tank to form a Solar direct heating circulation loop; the outlet of the unit end side is connected with the heat meter at the end of the unit, the main water supply pipe at the end of building No. 2, the control valve at the end side of No. 1 building, the control valve at the end side of No. 1 building, the control valve at the end side of No. 2 building, and the building No. 2 The main return water pipe at the end, the control valve at the end side of No. 3, the circulating water pump at the end side, and the inflow pipe at the end side of the heat pump unit are connected to form a heat supply cycle of the heat pump unit, which supplies heat to the end device of the building through the unit and the heat storage tank. 4. The solar-ground source heat pump coupled energy supply system with double buried pipe groups according to any one of claims 1-3, characterized in that domestic hot water heat exchange coils are arranged in the hot water storage tank , connected to the building through pipelines.