161 results about "Ground heat exchanger" patented technology

Recoverable Ground Source Heat Pump system with energy storage function which uses and stores off-peak-hours electricity to maintain the ground medium temperature to ensure the efficient operation of the system during on-peak electricity hours. The release and receiving of energy is accomplished through the ground heat exchanger by flowing the fluid through different routings of the circulation loop using reversing vales. Space heating and cooling is assured while the underground medium temperature is recovered. The heat pump system of the invention has less initial investment compared to conventional ground source heat pump and ice energy storage cooling systems; requires less ground space; provide operating energy cost savings; assures performance of operation; and avoids using antifreeze solution in the ground circulation fluid that may cause environmental, safety and erosion problems.

A composite energy system of solar energy, ground source heat pump and chilled water storage comprises an air conditioner, a domestic hot water supply device, one or more device (hereinafter referred to as host) of a solar energy heat-collecting device, a heat storage water tank unit, a cold storage water tank unit and a ground source heat pump system, a ground heat exchanger, an auxiliary heating device, a circulating water pump, a first electric three-way valve, a second electric three-way valve, a first electric two-way valve and a second electric two-way valve, wherein the circulating water pump is communicated with the air conditioner, and the auxiliary heating device is communicated with the domestic hot water supply device. The invention fully utilizes renewable energy sources such as solar energy, geothermal energy and biomass energy to masterly combine the ground source heat pump air-conditioning system with the solar energy hot water system and the chilled water storage system and construct a comprehensive energy system combined by the domestic hot water system, the ground source heat pump, the chilled water storage air-conditioning system and the like; and the invention is completely combined with the entire building so as to greatest reduce the floor space and the investment and increase the energy efficiency and economic performance of the system.

Provided is a geothermal air conditioning system. The system includes a plurality of indoor units, at least one outdoor unit, a ground heat exchanger, and an auxiliary heat source. The plurality of indoor units condition indoor air, the at least one outdoor unit communicates with the indoor units via, a plurality of pipes, and includes an outdoor heat exchanger where heat exchange occurs, and a plurality of compressors for compressing coolant. The ground heat exchanger is connected with the outdoor heat exchanger of the outdoor unit, and laid under the ground to allow heat to be exchanged between ground heat and a circulating medium circulating through the ground heat exchanger. The auxiliary heat source is installed on one side of the outdoor unit to assist heat exchange of the outdoor heat exchanger.

The invention relates to a heat-gaining combined heat and power system, which belongs to the application field of the energy technology, and consists of a gas engine, a power generator, an absorption-type heat pump, a high-temperature smoke-water heat exchanger, a middle-temperature smoke-water heat exchanger, a low-temperature smoke-water heat exchanger, a water-water heat exchanger, a solution dehumidifying system, a ground heat exchanger, a superficial-layer underground water well or a sewage heat exchanger and accessories such as connection pipes and valves. The system can realize two work conditions of heat supply and coldness supply, and is provided with multiple pipeline switching forms under the work conditions of the heat supply and the coldness supply so as to adapt to the requirements of different situations; the system can ensure the adequate utilization of the heat of the gas engine, can adequately recycle the surplus heat of the exhausted smoke of the gas engine in winter, and can realize the extraction of the heat of the low-temperature heat source so as to improve the comprehensive efficiency of the system and to reduce the environmental pollution; and the system can discharge the heat of the low-temperate smoke and the heat of the cooling water into the low-temperature heat source to be stored in summer; and moreover combined with the solution dehumidification and the living hot water, the energy utilization efficiency of the system can be improved.

The invention discloses a solar and GSHP (ground source heat pump) combined energy supply system for buildings. The sytsem provided by the invention comprises two subsystems, namely a solar and auxiliary GSHP system and a pure GSHP system, wherein the solar and auxiliary GSHP system comprises a solar thermal collector, a thermal storage water tank, a GSHP unit No.1, a ground heat exchanger No.1, a collected heat circulating water pump, a unit ground source collateral circulation water pump No.1, a unit user collateral circulation water pump No.1, indoor end equipment, a collected heat controlvalve, a heat accumulation control valve, solar supply heat control valves No.1 and No.2, a unit ground source collateral control valve No.1, a unit user collateral control valve No.1, heat accumulation / heat supply operational mode switch control valves No.1-No.4 and a connecting line; the pure GSHP system comprises a GSHP unit No.2, a ground heat exchanger No.2, a unit ground source collateral circulation water pump No.2, a unit user collateral circulation water pump No.2, indoor end equipment, a unit ground source collateral control valve No.2, a unit user collateral control valve No.2 and a connecting line.

Provided is an air conditioning system using ground heat. The system includes one or more indoor units, at least one outdoor unit, a ground heat exchanger, and a plurality of auxiliary heat sources. The one or more indoor units condition indoor air. The at least one outdoor unit communicates with the indoor units via a plurality of pipes, and includes an outdoor heat exchanger where heat exchange occurs. The ground heat exchanger is connected with the outdoor heat exchanger of the outdoor unit, and laid under the ground to allow heat to be exchanged between ground heat and a circulating medium circulating through the ground heat exchanger. The plurality of auxiliary heat sources are installed on one side of the outdoor unit to assist heat exchange of the outdoor heat exchanger. Two or more auxiliary heat sources are simultaneously used, or one of them is selectively used.

A geothermal loop in-ground heat exchanger for energy extraction including an outer tubular casing and an inner tubular portion spaced from the outer tubular casing to define an injection space wherein a working fluid is injected into the injection space at a first temperature, T1 while the heat exchanger is located in a geothermal heat reservoir and the working fluid exits through the inner tubular portion at a second temperature, T2 which is greater than T1.

The invention discloses a method of determining thermophysical parameters of rock soil and heat resistance of a vertical ground heat exchanger. The method includes steps: initializing test data and parameters of a drill hole and a buried pipe acquired in a thermal response experiment; initially setting rock soil heat conducting coefficient lambda s, rock soil volume heat capacity Cs and weight coefficient f corresponding to weight average temperature, and setting respective parameter ranges; using a column heat source model and a quasi-three-dimensional heat resistance model to calculate drillhole wall temperature Tb, I, ground heat exchanger inlet-outlet fluid temperature Tin, sim, i, Tout, sim, I and ground heat exchanger heat resistance Rb, I corresponding to each moment in the experiment; using square sum mean value of measured value and simulation value difference of the weight average temperature as a target function fopt, and using a simulated annealing algorithm to perform optimization iteration on lambda s, Cs and f; when fopt is lower than an optimization target value delta Tset, acquiring optimization results of three parameters lambda s, Cs and f, calculating a mean value of the sum of Rb, I at each moment corresponding to the optimization results, and acquiring heat resistance Rb of the ground heat exchanger. By the method, accuracy of recognition results on the thermophysical parameters of the rock soil and the heat resistance of the ground heat exchanger is improved.

The invention discloses a ground source heat pump system with a ground heat exchanger buried in a diaphragm wall retaining structure, comprising the ground heat exchanger (2) and the diaphragm wall retaining structure (1); wherein, the ground heat exchanger (2) is pre-buried in the diaphragm wall retaining structure (1); both ends of the ground heat exchanger (2) are exposed out of the diaphragm wall retaining structure (1). The system occupies less floor area and features low construction cost and good heat transfer effect.

A coaxial ground heat exchanger and installation method are disclosed where the heat exchanger has a central core tube that can be provided with a thermally insulating casing and an outer tube that delimits an annular gap which extends radially outwards from the core tube. The core tube and the annular gap can be configured such that a flowable heat transfer medium can flow through. The outer tube is formed by a tubular expandable cover that directly adjoins a wall of a ground heat exchanger borehole when the heat exchanger is installed.

The invention discloses a solar energy-ground source heat pump-floor radiation heating combined heating system. The system comprises a solar thermal collector, a heat storage water tank communicated with the solar thermal collector, a horizontal ground heat exchanger, a heat pump unit and a geothermal water well, wherein the inlet and outlet of the horizontal ground heat exchanger are communicated with a second outlet and a second inlet of the heat storage water tank, the water outlet and water inlet of the condenser of the heat pump unit are communicated with the inlet and outlet of the horizontal ground heat exchanger, the water inlet of the evaporator of the heat pump unit is connected with the third outlet of the heat storage water tank through the forth liquid inlet pipe of a second circulation pump group which is arranged on the water inlet, and the water outlet thereof is connected with the third inlet of the heat storage water tank through the forth liquid inlet pipe of a fifth electromagnetic valve which is arranged on the water outlet; and the geothermal water well is connected with the forth liquid inlet pipe through the fifth liquid outlet pipe of a submerged pump group which is arranged on the geothermal water well, and one end of the fifth liquid inlet pipe of a sixth electromagnetic valve which is arranged on the geothermal water well is communicated with the forth liquid outlet pipe. By adopting the method of the invention, the coefficient of performance of the heat pump unit can reach above 5.0.

The invention discloses a heat storage type solar ground source heat pump which comprises a solar thermal collector, a solar water storage tank, a temperature conversion water storage tank, a heat pipe exchanger, a water separator, a water collector, a ground heat exchanger, a heat pump unit and an indoor unit. The heat storage type solar ground source heat pump provided by the invention can meet the requirements of refrigeration, heat supply and domestic hot water supply, wherein a solar heat collecting system can realize heat storage seasonally, the temperature conversion water storage tank can realize high-quality heat supply in winter, and replace absorption type or adsorption type refrigeration equipment using solar hot water as driving force in the conventional solar ground source heat pump system in summer, the condensation heat is recycled by adopting a film falling method for heat exchange so as to realize efficient refrigeration, therefore, the intermittent operation of the ground source heat pump system and the heat storage type solar system is adopted, the recovery of an underground temperature field is facilitated, accordingly the heat exchange efficiency of a buried pipe is improved, and the service life of the ground source heat pump system is prolonged.

The invention discloses a phase change heat storage type ground heat exchanger, and belongs to the field of ground-source heat pump air conditioners. The phase change heat storage type ground heat exchanger is composed of one or more phase change heat storage type ground heat exchanging wells, and each phase change heat storage type ground heat exchanging well comprises a water circulation U-shaped pipe, a phase change heat storage pipe, phase change heat storage materials and backfill materials, wherein the water circulation U-shaped pipe is arranged in a drilled well, the at least one phase change heat storage pipe is arranged between a water inlet pipe and a water outlet pipe of the water circulation U-shaped pipe, the phase change heat storage pipe is filled with the phase change heat storage materials, the two ports of the phase change heat storage pipe are closed, and gaps between the drilled well wall and the water circulation U-shaped pipe and between the water circulation U-shaped pipe and the phase change heat storage pipe are filled with the backfill materials. According to the phase change heat storage type ground heat exchanger, the heat storage capacity in the drilled well is improved, the ground heat short circuits are reduced, and therefore the heat exchange performance of the ground heat exchanger is strengthened.

The invention relates to a U-type ground heat exchanger heat and moisture transfer performance simulation test device and test method, which belongs to the technical field of ground-source heat pump air-conditioning. The device comprises a constant temperature water area, a circulating water pump, a sand test bed, a U-type ground heat exchanger, a constant temperature remote boundary simulation system, a groundwater seepage simulation system, a flow meter, a flow control valve, a temperature sensor, a humidity sensor and a data acquisition device. According to the invention, experiments of the influence law of soil type, soil stratification, borehole backfill materials, soil moisture content, soil original temperature, inlet water temperature, fluid flow and the like on the heat transfer performance of the U-type ground heat exchanger can be completed; heat transfer characteristic experiments of the U-type ground heat exchanger under the conditions of groundwater seepage and heat and moisture migration can be carried out; tests of a variety of working conditions can be carried out; and the defect that simply the heat transfer performance of the U-type ground heat exchanger under the condition of a test hole can be acquired through the existing test device, while the influence law of different factors on the heat transfer performance of the U-type ground heat exchanger under different working conditions cannot be acquired is overcome.

An energy system of a solar energy composite ground source heat pump comprises an air conditioner, a domestic hot water supply device, a solar energy heat-collecting device, a heat storage unit, a ground source heat pump system, a ground heat exchanger, an auxiliary heating device, a first electric three-way valve and a second electric three-way valve, wherein the first electric three-way valve or the second electric three-way valve is communicated with the air conditioner, the heat storage unit is communicated with the domestic hot water supply device; and the ground heat exchanger and the ground source heat pump system are separately communicated with the first electric three-way valve, the ground source heat pump system and the heat storage unit are separately communicated with the second electric three-way valve, and the solar energy heat-collecting device and the auxiliary heating device are separately communicated with the at heat storage unit. By adopting the structure, the invention organically combines the technologies of applications of the solar energy light-heat, ground source heat pump air conditioner, biomass energy and the like with buildings, and can be used for refrigeration in summer, heating in winter and hot water supply in four seasons and can also largely reduce the energy consumption of buildings, thus having significant social, economic and environmental benefits.

The invention relates to the technical field of ground source heat pump system and specifically provides a grouting backfill material special for a ground source heat pump. Choice of the grouting backfill material has important meaning for guaranteeing performances of a ground heat exchanger. The research on development of a high thermal conductivity novel backfill material has significant social and economic benefits for popularizing ground source heat pump technology and promoting low carbon economy. The invention provides a high thermal conductivity backfill material, comprising powder and aggregate in a mass percent of 1:2, wherein the powder contains metal and compound thereof accounting for 10-20wt% of the powder, heatproof cement accounting for 30-35wt% of the powder, bentonite accounting for 10-15wt% of the powder and the balance of clay, and the aggregate contains metal and compound thereof accounting for 15-30wt% of the aggregate and a mixture of one or two selected from quartz sand and alumina; and a water reducer accounts for 0.3wt% of the drier.

The invention provides a ground heat exchanger used for a ground source heat pump air conditioning system. According to structural factors of pipes themselves and interaction factors between the pipes and geothermal resources and through structural improvement and optimization, the heat exchange performance of the ground heat exchanger is enhanced, and the heat exchange efficiency between water flows in the pipes of the ground heat exchanger and the geothermal resources is increased. The ground heat exchanger is used in the ground source heat pump air conditioning system, the service life of the ground heat exchanger can be prolonged, the energy efficiency of the ground source heat pump air conditioning system is increased, energy consumption and the fault rate of the system are lowered, and therefore the problem that an existing ground heat exchanger structure is prone to causing low heat exchange efficiency, high fault rate, low energy efficiency, non-obvious energy-saving benefits and the like of the ground source heat pump air conditioning system is solved.

The invention discloses an efficient calculating method for parametrization design of a vertical ground heat exchanger. According to the efficient calculating method provided by the invention, the method comprises the steps of expressing the hourly heat absorbing and radiating heat flow of the vertical ground heat exchanger of a heat pump system as a rectangular pulse heat flow sequence; introducing a concept of underground rock dimensionless transient temperature response g function under the effect of unit rectangular pulse heat flow, so as to obtain the function with the integrating interval of [0, deltaF0]; and taking drill parameters into design calculation, so that the calculating result is accurate and reliable, the calculation time is greatly shortened, and the efficient calculation method is provided for achieving the parametrization design of the vertical ground heat exchanger.

The invention relates to an auxiliary heating device and method for increasing the oil-gas recovery rate of oil shale in-situ mining, and belongs to the field of oil shale in-situ mining. The auxiliary heating device comprises an air compressor, a ground heat exchanger, a heating pipe, a temperature sensor, an automatic temperature control device, a gas pump, a staged condensing device, an oil-water separating device, a three-phase separator, a gas generator set, a combustible gas compressor and the like; and the heating pipe heats a heat injecting well section, the heating pipe and the groundheat exchanger jointly act to provide high-temperature gas for pyrolysis of an oil shale bed. The auxiliary heating method comprises the steps of early-stage preparation, a heating stage and an oil-production and gas-production stage. According to the auxiliary heating device and method, through a heating function of the heating pipe, on the one hand, the temperature of a production well is maintained within a certain range, and in-advance oil and gas condensation is effectively prevented; on the other hand, water in the product and a heating material react to release heat, and thus the watercontent in the product is effectively decreased; and combustible gas in the product is utilized to generate electricity to serve as an auxiliary power supply, and the cost expenditure is reduced.

The invention discloses a total heat recovery air-source heat pump system with the solar energy-rock and soil energy as a low-grade heat source. The total heat recovery air-source heat pump system comprises a ground heat exchanger, a solar thermal collector, a low-temperature water tank, an evaporator, a condenser, a heat recovery heat exchange device and a compressor. Heat exchange coils are arranged in the low-temperature water tank, the evaporator and the heat recovery heat exchange device correspondingly. The heat exchange coil of the low-temperature water tank is connected with the ground heat exchanger through a pipeline. The low-temperature water tank is connected with the heat exchange coil of the evaporator through pipelines. The evaporator is sequentially connected with the compressor and the heat recovery heat exchange device through pipelines, and then the compressor and the heat recovery heat exchange device are connected back to the evaporator through a throttling valve to form a loop. An air-cooled condenser is arranged between the pipeline connected with the compressor and a pipeline connected with the throttling valve. The two ends of the solar thermal collector are connected to a pipeline enabling a water outlet of the heat exchange coil of the low-temperature water tank to be connected with a water inlet of the ground heat exchanger through three-way valves correspondingly. By adoption of the total heat recovery air-source heat pump system with the solar energy-rock and soil energy as the low-grade heat source, the problems that the energy efficiency is low and frosting is prone to occurring when an air-source heat pump unit operates in a cold region in winter are solved.

This invention discloses a forced heat exchange method and device for underground heat exchanger of earth source heat pump, which contains buried pipe system, soil humidity and temperature sensor, water filling pressuring storage system and control circuit. Said invention is filled water to soil around the underground heat exchanger by detecting the soil temperature and humidity when in summer the detected temperature higher than preset value and humidity lower than preset value, and in winter the detected the soil temperature lower then preset value.

The invention discloses an air energy soil-thermal storage heating and cooling device for fruit and vegetable plastic sheds or greenhouses in cold areas, and particularly relates to an air energy soil-thermal storage heating and cooling device which solves the problems of current heating energy waste of winter plastic sheds in the cold areas, failure in cooling in summer, high maintenance cost and disadvantages in planting. Vertical U-shaped ground heat exchangers are respectively communicated with a first by-pass pipe and a first circulating pump through communication of a low-temperature side water supply pipe, and the first by-pass pipe is communicated with a second circulating pump; the first circulating pump is communicated with a heat pump unit which is communicated with a low-temperature side return water pipe; the heat pump unit is communicated with the second circulating pump which is communicated with a fan coil; the fan coil is respectively communicated with a second by-pass pipe and a first valve, the second by-pass pipe is communicated with the low-temperature side return water pipe, and the first valve is communicated with the heat pump unit; and the low-temperature side return water pipe is communicated with the vertical U-shaped ground heat exchangers.

The invention relates to a geothermal energy compound type gas-fired cooling, heating and power trigeneration system realizing thorough recovery of flue gas condensation heat. The system comprises a gas engine, a power generator, an absorption heat pump, an electric heat pump, a first spraying type gas-gas heater, a second spraying type gas-gas heater, a ground heat exchanger, a water-water heat exchanger, a heat storage water tank, connection pipes and valves. Heating and cooling can be realized by the system, the system is capable of thoroughly recovering flue gas condensation heat to greatly lower exhaust gas temperature and reduce pollutant emission and further capable of extracting superficial terrestrial heat to realize complementation of fossil energy and renewable energy sources, and improvement of energy utilization efficiency of the system is facilitated.

The invention discloses an industrial waste heat and solar energy combined cross-season heat accumulation and regional heat supply system, and belongs to the technical field of regional heat supply. The system comprises an industrial waste heat recycling device, a solar heat collector, a ground heat exchanger, a low-temperature hot water heat collecting tail end device, a connecting pipeline, a plurality of sets of circulation pumps and a plurality of sets of valves. The industrial waste heat recycling device is connected with the solar heat collector, the ground heat exchanger and the low-temperature hot water heat collecting tail end device in series or in parallel through the valves, the circulation pumps and the connecting pipeline to form a switchable heat accumulation and heat supply loop. The cross-season heat accumulation manner is adopted in the system, heat in summer is used in winter, and the yearly utilization rate of a solar system and an industrial waste heat system is increased. Meanwhile, the system heat taking and releasing procedure is optimized, the heat of soil is extracted through direct heat exchange in the manner of improving the temperature grade of the underground soil instead of adopting soil balance temperature heat supplementation, and waste of the energy grade due to utilization of a heat pump is avoided.

The invention discloses a ground-source heat pump system for supplying heat / cold under under the assistance of valley electricity and a method thereof. The system comprises a ground heat exchanger, a ground-source heat pump unit and an electric heating device; the ground heat exchanger and a primary side of a heat exchanger III form a circulation loop I; a secondary side of the heat exchanger III and the user side form a circulation loop II; through the ground-source heat pump unit, the ground heat exchanger directly forms a circulation loop III together with the user side; the ground heat exchanger and a primary side of a heat exchanger I form a circulation loop IV through the ground-source heat pump unit; a secondary side of a heat exchanger I and the user side form a circulation loop V; the electric heating device and a primary side of a heat exchanger II form a circulation loop VI; a secondary side of the heat exchanger II and the user side form a circulation loop VII. The shallow geothermal energy is combined with technologies and measures for power demand side management, a ground-source heat pump is used as the main cold / heat source, an electric boiler used during the valley period of the power and the floor radiation form is adopted at the tail end to supply cold / heat for buildings.

The invention provides a high-effect multifunctional solar-energy water heater, comprising a separated vacuum tube heat collector, a tube heat exchanger, a ground heat exchanger, a heat collecting water box, an electric water heater, and a ground heat module. The separated vacuum tube heat collector via medium circulated tube is connected with the superconductive heat exchanger in the heat collecting water box; the ground heat module via circulate tube is connected with the ground heat exchanger in the heat collecting water box; the electric water heater is at the bottom of heat collecting water box; the end of the heater collecting water box is arranged with a cold water inlet tube and a hot water outlet tube connected with the bathing mixed valve; the circulate tube connecting the ground heat module and ground heat exchanger is arranged with heating hot water port connected with the integrated heating system. Compared with present technique, the invention has simple structure, easy installment and hot water supply all the year.

The invention provides a ground source heat pump system for recovering the heat of wind in a tunnel, which relates to a ground source heat pump system. The invention aims to solve the self-contradictory problem that the prior underground tunnel carries the heat of wind out of the room and simultaneously uses other heat sources to supply heat for a station platform, thus energy sources are wasted.The ground source heat pump system also comprises a tunnel wind heat collecting device and a constant pressure device which are sequentially connected in series, wherein the tunnel wind heat collecting device is a loop formed by connecting a plurality of ground heat exchangers which are connected in parallel with a circulating water pump in series; the constant pressure device is formed by connecting a supplying water tank with a constant pressure supplying water pump in series; the liquid inlet end of each evaporator is connected with an inlet valve, and the liquid outlet end of each evaporator is connected with an outlet valve; the circulating water pump is communicated with the inlet valve; the heat pump, the inlet valve, the tunnel wind heat collecting device, the outlet valve and theheat pump are sequentially connected to form the loop; and the circulating water pump is communicated with the constant pressure supplying water pump through a pipeline. The ground source heat pump system is used for recovering the heat of the wind generated when the underground runs in the tunnel.

The invention discloses a high-efficiency clean energy source heat supplying system using heat energy of hot dry rocks. The high-efficiency clean energy source heat supplying system comprises a plurality of tubular metal heat exchangers which are positioned in a hot dry rock layer and are filled with heat media, wherein a heat medium outlet of each tubular metal heat exchanger is connected with a heat medium circulating pump through a pipeline; the heat medium circulating pump is connected with a heat medium inlet of a ground heat exchanger through a pipeline; a heat medium outlet of the ground heat exchanger is connected with a heat medium inlet of each tubular metal heat exchanger through a pipeline; the high-efficiency clean energy source heat supplying system also comprises a user end; a water outlet of the user end is connected with a water circulating pump through a pipeline; the water circulating pump is connected with a water inlet of the ground heat exchanger through a pipeline; and a water outlet of the ground heat exchanger is connected with a water inlet of the user end through a pipeline. The invention provides the high-efficiency clean energy source heat supplying system using the heat energy of the hot dry rocks; clean energy sources are effectively utilized, and underground water is prevented from being polluted; no pollutants in the development process are discharged; and the high-efficiency clean energy source heat supplying system is low in operation expenses and is wide in application range.

The invention relates to a soil source fuel gas heat pump system with the heat balance active recovery function. The soil source fuel gas heat pump system comprises a water source fuel gas heat pump unit and is characterized in that the water source fuel gas heat pump unit is respectively connected with a ground heat exchanger, a fan coil and a domestic hot water heat exchange tank through a heat pump unit ground source water electrically-operated valve, a heat pump unit electric valve and a heat recycling overhauling turn-off valve, the fan coil is connected with a fresh air handling unit, and the domestic hot water heat exchange tank is connected with a solar heat collector. The soil source fuel gas heat pump system has the advantages that a ground heat exchanging system serves as a cold and heat source of a fuel gas heat pump, the operation efficiency of the system can be improved, system energy consumption is reduced, heat balance active recovery of the ground heat exchanger can be conducted through the fresh air handling unit, cold and hold accumulation of the ground heat exchanger can be eliminated, the service life of efficient operation of the ground heat exchanger is prolonged, a system controller is arranged, the system can be scientifically and reasonably controlled to produce domestic hot water and heat balance recovery is conducted.