Heat supply system and air conditioning system for step-by-step utilization of middle-deep geothermal energy

Abstract

The application provides a heat supply system and an air conditioning system for step-by-step utilization of middle-deep geothermal energy. The heat supply system comprises at least one external envelope structure unit, the external envelope structure unit comprises an external envelope installation base body, a heat exchange module is arranged in the external envelope installation base body, the heat exchange module comprises at least two heat exchange pipes connected in series, a first circulation loop is connected with the heat exchange module, in the case that a plurality of external envelope structure units are included, the heat exchange modules of the plurality of external envelope structure units are connected in parallel, and a geothermal energy collection unit comprises at least one buried pipe heat exchanger for collecting heat from a middle-deep rock layer, and the buried pipe heat exchanger is connected with the first circulation loop. The system can utilize the middle-deep geothermal energy to process the heat load of the envelope structure matched with the energy grade, realize step-by-step utilization of the middle-deep geothermal energy and direct heat supply of the buried pipe water, improve the utilization rate of the middle-deep geothermal energy, can consume renewable energy power, and realize long-term stable operation of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to a heat supply system and air conditioning system for step utilization of medium-deep geothermal energy. BACKGROUND

[0002] The medium-deep geothermal pipe extracts heat stored in a 2-3 km deep rock layer through a heat exchange method, and combines a heat pump system to supply heat to a building, without exploiting underground water, thereby achieving "water conservation and heat extraction". The water outlet temperature of the medium-deep geothermal pipe is lower than the required water supply temperature of a traditional heat supply terminal, and the energy grade needs to be improved through a heat pump, thus a large amount of electric energy needs to be consumed. The water outlet temperature of the medium-deep geothermal pipe is higher than the temperature of a building envelope and indoor air in the north in winter, and the water outlet of the medium-deep geothermal pipe is used to heat the building envelope and indoor air, which has the possibility of meeting the indoor heat supply demand. Embedding a pipe in the building envelope and supplying hot water with a temperature significantly lower than the traditional terminal water supply temperature can reduce the heat dissipation of indoor air to the outside, thereby achieving low-temperature heat supply.

[0003] The existing single-layer embedded pipe type building envelope still needs to be combined with other heat supply terminals to meet the indoor heat supply demand due to the low water supply temperature. A related art discloses a building envelope in which two layers of embedded pipes are embedded in a wall and a roof, the outer layer of embedded pipes uses low-temperature hot water obtained by natural energy to achieve load interception, and the inner layer of embedded pipes uses hot water with a temperature slightly higher than the indoor temperature to achieve low-temperature heat supply, but the water supply of the inner layer of embedded pipes in the building envelope still needs to be obtained by a heat pump.

[0004] In addition, renewable energy power such as wind power and photovoltaic power has great volatility. The heat supply system combining the deep geothermal pipe with the heat pump can use the medium-deep geothermal energy for heat supply when the power supply is tight, and can use the heat pump for heat supply when the renewable energy power needs to be consumed, thereby solving the problem of abandoned wind and light, improving the flexibility of the power grid, and achieving intermittent operation of the medium-deep geothermal pipe, which is beneficial to the recovery of soil and rock temperature and the long-term stable operation of the system. SUMMARY

[0005] The present application provides a heat supply system for step utilization of medium-deep geothermal energy, which can use the medium-deep geothermal energy to process the heat load of the building envelope with a matching energy grade, achieve step utilization of the medium-deep geothermal energy, and improve the utilization rate of the medium-deep geothermal energy; can achieve direct heat supply of the medium-deep geothermal energy, break through the bottleneck that the water outlet of the medium-deep geothermal pipe needs to be improved in energy grade through a heat pump; and can consume renewable energy power, achieve intermittent operation of the medium-deep geothermal pipe, and be beneficial to the recovery of soil and rock temperature and the long-term stable operation of the system.

[0006] The present application provides a heat supply system for step utilization of medium-deep geothermal energy, which includes:

[0007] At least one peripheral envelope unit, the peripheral envelope unit comprising a peripheral envelope installation base body, a heat exchange module being arranged in the peripheral envelope installation base body, the heat exchange module comprising at least two heat exchange pipes connected in series, a medium channel being arranged in each of the heat exchange pipes;

[0008] A first circulation loop, the heat exchange module being connected with the first circulation loop, in the case of a plurality of peripheral envelope units, the heat exchange modules of the plurality of peripheral envelope units being connected in parallel with each other;

[0009] A geothermal energy collection unit, the geothermal energy collection unit comprising at least one ground heat exchanger for collecting heat from a medium-deep stratum, a medium channel being arranged in the ground heat exchanger, the ground heat exchanger being connected with the first circulation loop.

[0010] The heat supply system for the step-by-step utilization of medium-deep geothermal energy provided by the application further comprises an indoor unit, the indoor unit comprising an indoor installation base body, a radiant heat exchanger being arranged in the indoor installation base body, a medium channel being arranged in the radiant heat exchanger;

[0011] And / or, further comprising a convection unit, the convection unit comprising a convection heat exchanger and a convection fan, a medium channel being arranged in the convection heat exchanger;

[0012] The radiant heat exchanger is connected with the heat exchange module; and / or, the convection heat exchanger is connected with the radiant heat exchanger.

[0013] The heat supply system for the step-by-step utilization of medium-deep geothermal energy provided by the application further comprises a heat pump unit, the heat pump unit comprising a second circulation loop, a compressor, a throttling device, an outdoor heat exchanger and an indoor heat exchanger, the compressor and the throttling device being arranged on the second circulation loop, the indoor heat exchanger comprising an indoor refrigerant channel and an indoor cold carrier channel;

[0014] A bypass device being arranged between the convection heat exchanger, the radiant heat exchanger, the heat exchange module and the heat exchange pipes at the outermost side, the indoor cold carrier channel being connected with the radiant heat exchanger and / or the convection heat exchanger and / or the heat exchange module.

[0015] The heat supply system for the step-by-step utilization of medium-deep geothermal energy provided by the application further comprises a heat pump unit, the heat pump unit comprising a second circulation loop, a compressor, a throttling device, an outdoor heat exchanger and an indoor heat exchanger, the compressor and the throttling device being arranged on the second circulation loop, the indoor heat exchanger comprising an indoor refrigerant channel, an indoor cold carrier channel, an indoor air flow channel and an indoor fan;

[0016] The bypass device is arranged between the convection heat exchanger, the radiation heat exchanger and the heat exchange module.

[0017] According to the heat supply system for step-by-step utilization of medium-deep geothermal energy, the outdoor heat exchanger comprises an outdoor refrigerant passage, an outdoor air flow channel and an outdoor fan, and the outdoor refrigerant passage is connected with the second circulating loop.

[0018] According to the heat supply system for step-by-step utilization of medium-deep geothermal energy, the outdoor heat exchanger comprises an outdoor refrigerant passage and an outdoor cold carrier passage, and two ends of the outdoor cold carrier passage are respectively connected with the outlet of the outermost heat exchange tube in the heat exchange module and the medium passage inlet of the ground heat exchanger.

[0019] According to the heat supply system for step-by-step utilization of medium-deep geothermal energy, the outdoor heat exchanger comprises an outdoor refrigerant passage, an outdoor cold carrier passage, an outdoor air flow channel and an outdoor fan, and two ends of the outdoor cold carrier passage are respectively connected with the outlet of the outermost heat exchange tube in the heat exchange module and the medium passage inlet of the ground heat exchanger.

[0020] According to the heat supply system for step-by-step utilization of medium-deep geothermal energy, heat exchange devices are arranged in parallel at two ends of the outdoor heat exchanger.

[0021] The application further provides an air conditioning system for step-by-step utilization of medium-deep geothermal energy, comprising the heat supply system for step-by-step utilization of medium-deep geothermal energy as described in any one of the above, and a four-way reversing valve for switching the flow direction of refrigerant is arranged on the second circulating loop.

[0022] The heat supply system for step-by-step utilization of medium-deep geothermal energy can utilize the geothermal energy collected by the geothermal energy collection unit to process the thermal load of the envelope structure with a matching energy grade, realize step-by-step utilization of medium-deep geothermal energy, and improve the utilization rate of medium-deep geothermal energy.

[0023] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0025] Figure 1 is a schematic diagram of a heat supply system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 1;

[0026] Figure 2 is a schematic diagram of a heat supply system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 2;

[0027] Figure 3 is a schematic diagram of a heat supply system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 3;

[0028] Figure 4 is a schematic diagram of a heat supply system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 4;

[0029] Figure 5 is a schematic diagram of a heat supply system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 5;

[0030] Figure 6 is a schematic diagram of a heat supply system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 6;

[0031] Figure 7 is a schematic diagram of a heat supply system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 7;

[0032] Figure 8 is a schematic diagram of a heat supply system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 8;

[0033] Figure 9 is a schematic diagram of a heat supply system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 9;

[0034] Figure 10 is a schematic diagram of one of the operation modes of a heat supply system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 9;

[0035] Figure 11 is a schematic diagram of another operation mode of a heat supply system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 9;

[0036] Figure 12 is a schematic diagram of a heat supply system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 10;

[0037] Figure 13 is a schematic diagram of a heat supply system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 11;

[0038] Figure 14 is a schematic diagram of an air conditioning system of the present application for the step-by-step utilization of middle-deep geothermal energy, embodiment 1.

[0039] Figure label:

[0040] 1. First circulation loop; 2. External enclosure mounting base; 3. Circulation pump; 4. Buried pipe heat exchanger; 5. Indoor mounting base; 6. Radiant heat exchanger; 7. Inner heat exchange tube; 8. Outer heat exchange tube; 9. Convection heat exchanger; 10. Convection fan; 11. Second circulation loop; 12. Compressor; 13. Throttling device; 14. Outdoor heat exchanger; 141. Outdoor refrigerant passage; 142. Outdoor refrigerant passage; 143. Outdoor air flow channel; 144. Outdoor fan; 15. Indoor heat exchanger; 151. Indoor refrigerant passage; 152. Indoor refrigerant passage; 153. Indoor air flow channel; 154. Indoor fan; 16. Four-way reversing valve; 17. Heat exchange device. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention 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 invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0042] The following is combined with Figures 1-14 The present invention describes a heating system and an air conditioning system for the cascade utilization of medium-deep geothermal energy.

[0043] Heating System for Cascade Utilization of Medium-Deep Geothermal Energy - Example 1

[0044] like Figure 1 The diagram shown is a schematic representation of Embodiment 1 of the heating system for the cascade utilization of medium-deep geothermal energy provided by the present invention. The heating system for the cascade utilization of medium-deep geothermal energy in this embodiment includes at least one external envelope unit, a first circulation loop 1, a geothermal energy acquisition unit, and an indoor unit.

[0045] The outer enclosure structure unit includes an outer enclosure mounting base 2, and a heat exchange module is provided inside the outer enclosure mounting base 2. The heat exchange module includes at least two heat exchange tubes connected in series, and each heat exchange tube is provided with a medium channel.

[0046] The heat exchange module is connected to the first circulation loop 1, and the first circulation loop 1 is equipped with a circulation pump 3 to drive the flow of the medium.

[0047] The geothermal energy collection unit includes at least one buried pipe heat exchanger 4 for collecting heat from medium-deep rock strata. The buried pipe heat exchanger 4 is provided with a medium channel and is connected to the first circulation loop 1.

[0048] The indoor unit comprises an indoor installation base body 5, a radiation heat exchanger 6 is arranged in the indoor installation base body 5, and a medium channel is arranged in the radiation heat exchanger 6.

[0049] It should be noted that, in the embodiment of the present application, in the case of comprising multiple peripheral envelope structure units, the heat exchange modules of the multiple peripheral envelope structure units are connected in parallel with each other; the peripheral envelope installation base body 2 can be a building outer wall body, or can be other outer building bodies capable of installing / bearing the heat exchange module; the heat exchange pipes in the heat exchange module are arranged in the peripheral envelope installation base body 2 in an embedded manner, and the number of the heat exchange pipes is at least two, and in this embodiment, two heat exchange pipes are taken as an example, and from inside to outside, the heat exchange pipes are an inside heat exchange pipe 7 and an outside heat exchange pipe 8; the heat exchange pipes can adopt at least one of a light pipe, a reinforced pipe or a flat pipe; the number of the ground buried pipe heat exchanger 4 is not limited, and in the case of comprising multiple ground buried pipe heat exchangers 4, all the ground buried pipe heat exchangers 4 can deliver the collected geothermal energy to the first circulating loop 1 through the medium channel, so as to improve the heat extraction efficiency; the indoor installation base body 5 can adopt at least one of a building inner wall, a floor or a suspended ceiling, or can be other inner building bodies capable of installing / bearing the radiation heat exchanger 6.

[0050] Specifically, in this embodiment, the ground buried pipe heat exchanger 4, the radiation heat exchanger 6, the inside heat exchange pipe 7 and the outside heat exchange pipe 8 are connected to the first circulating loop 1 through the internal medium channels and are in a series connection. The first circulating loop 1 is provided with a circulating pump 3 for driving the medium to flow; the pipeline connected with the radiation heat exchanger 6 and the first circulating loop 1 is further provided with a valve, and the valve can control the on-off of the corresponding pipeline and the flow regulation of the medium in the pipeline. The above-mentioned “the ground buried pipe heat exchanger 4, the radiation heat exchanger 6, the inside heat exchange pipe 7 and the outside heat exchange pipe 8 are connected to the first circulating loop 1 through the internal medium channels and are in a series connection” means that: the outlet of the medium channel in the ground buried pipe heat exchanger 4 is connected to the inlet of the medium channel in the radiation heat exchanger 6, the outlet of the medium channel in the radiation heat exchanger 6 is connected to the inlet of the medium channel in the inside heat exchange pipe 7, the outlet of the medium channel in the inside heat exchange pipe 7 is connected to the inlet of the medium channel in the outside heat exchange pipe 8, and the outlet of the medium channel in the outside heat exchange pipe 8 is connected to the inlet of the medium channel in the ground buried pipe heat exchanger 4.

[0051] The heat supply system provided by the present application can utilize the geothermal energy collected by the geothermal energy collection unit to process the envelope structure heat load with a matching energy grade, so as to realize the step-by-step utilization of the medium-deep geothermal energy, solve the problem of insufficient heat utilization caused by the excessively high water inlet temperature of the medium-deep ground buried pipe, and realize the direct heating of the medium-deep geothermal energy, so as to solve the problem that the water outlet of the medium-deep ground buried pipe needs to be heated by a heat pump to improve the energy grade before being used for heating.

[0052] Heat supply system for step-by-step utilization of medium-deep geothermal energy - embodiment 2

[0053] As Figure 2 shown, it is a schematic diagram of the heat supply system of the middle-deep geothermal energy cascade utilization provided by the present application, embodiment 2. The heat supply system of the middle-deep geothermal energy cascade utilization in this embodiment further comprises a convection unit on the basis of embodiment 1, the convection unit comprises a convection heat exchanger 9 and a convection fan 10, and the convection heat exchanger 9 is provided with a medium passage. The convection fan 10 is used to drive the circulating medium in the medium passage of the convection heat exchanger 9 to exchange heat with indoor air, thereby supplying indoor heating air; the convection heat exchanger 9 is connected with the first circulating loop 1 and the radiation heat exchanger 6 respectively, and the convection heat exchanger 9 is connected to the first circulating loop 1 through the internal medium passage and is in a series relationship with the radiation heat exchanger 6, the inner heat exchange pipe 7 and the outer heat exchange pipe 8.

[0054] In the heat supply system of this embodiment, the air at the convection heat exchanger 9 is heated by the circulating medium with the highest temperature grade, the building envelope at the radiation heat exchanger 6 and the inner heat exchange pipe 7 is heated by the circulating medium with a higher temperature grade, and the building envelope at the outer heat exchange pipe 8 is heated by the circulating medium with the lowest temperature grade, thereby realizing the cascade utilization of middle-deep geothermal energy.

[0055] Heat supply system of middle-deep geothermal energy cascade utilization - embodiment 3

[0056] As Figure 3 shown, it is a schematic diagram of the heat supply system of the middle-deep geothermal energy cascade utilization provided by the present application, embodiment 3. The heat supply system of the middle-deep geothermal energy cascade utilization in this embodiment is different from that of embodiment 2 in that the convection heat exchanger 9 and the radiation heat exchanger 6 are connected in parallel.

[0057] Heat supply system of middle-deep geothermal energy cascade utilization - embodiment 4

[0058] As Figure 4 shown, it is a schematic diagram of the heat supply system of the middle-deep geothermal energy cascade utilization provided by the present application, embodiment 4. The heat supply system of the middle-deep geothermal energy cascade utilization in this embodiment further comprises a heat pump unit on the basis of embodiment 1, the heat pump unit comprises a second circulating loop 11, a compressor 12, a throttling device 13, an outdoor heat exchanger 14 and an indoor heat exchanger 15, the compressor 12 and the throttling device 13 are arranged on the second circulating loop 11, and the outdoor heat exchanger 14 and the indoor heat exchanger 15 are both fluorine-water heat exchangers;

[0059] Specifically, in the embodiment, the outdoor heat exchanger 14 comprises an outdoor secondary refrigerant passage 141 and an outdoor refrigerant passage 142, the indoor heat exchanger 15 comprises an indoor secondary refrigerant passage 151 and an indoor refrigerant passage 152, the outdoor secondary refrigerant passage 141 is connected with the first circulation loop 1, the indoor secondary refrigerant passage 151 is connected with the radiant heat exchanger 6, a circulation pump 3 is arranged on the pipeline through which the indoor secondary refrigerant passage 151 is connected with the radiant heat exchanger 6 in parallel, and the outdoor refrigerant passage 142 and the indoor refrigerant passage 152 are both arranged on the second circulation loop 11.

[0060] In the embodiment, the circulation medium at the outlet of the medium passage in the ground heat exchanger 4 is divided into two branches, one of which flows through the medium passages in the inner heat exchange pipe 7 and the outer heat exchange pipe 8 to exchange heat with the peripheral structure, and the other of which flows through the outdoor secondary refrigerant passage 141 and the indoor refrigerant passage 152 to exchange heat with the refrigerant, and the circulation medium of the two branches is combined and returned to the inlet of the medium passage in the ground heat exchanger 4; the radiant heat exchanger 6 is heated by the circulation medium with the highest temperature grade obtained by the heat pump unit, the peripheral structure at the inner heat exchange pipe 7 is heated by the circulation medium with a higher temperature grade, and the peripheral structure at the outer heat exchange pipe 8 is heated by the circulation medium with the lowest temperature grade, so that the step-by-step utilization of the medium-deep geothermal energy is realized.

[0061] The heat supply system for step-by-step utilization of medium-deep geothermal energy - embodiment 5

[0062] As shown in Figure 5 , it is a schematic diagram of the heat supply system for step-by-step utilization of medium-deep geothermal energy provided by the present application, embodiment 5. The heat supply system for step-by-step utilization of medium-deep geothermal energy in the embodiment further comprises a convection unit on the basis of embodiment 4, the convection unit comprises a convection heat exchanger 9 and a convection fan 10, the indoor secondary refrigerant passage 151, the convection heat exchanger 9 and the radiant heat exchanger 6 are connected in series, and a circulation pump 3 is arranged on the pipeline through which the indoor secondary refrigerant passage 151 is connected with the convection heat exchanger 9. Similarly, by arranging the convection unit, the air at the convection heat exchanger 9 is heated by the circulation medium with the highest temperature grade, and the convection fan 10 is used to drive the circulation medium in the medium passage in the convection heat exchanger 9 to exchange heat with the indoor air, so as to supply indoor heating air.

[0063] The heat supply system for step-by-step utilization of medium-deep geothermal energy - embodiment 6

[0064] As shown in Figure 6The diagram shown is a schematic representation of Embodiment 6 of the heating system for the cascade utilization of medium-deep geothermal energy provided by the present invention. Based on Embodiment 5, this embodiment of the heating system for the cascade utilization of medium-deep geothermal energy utilizes a bypass device to bypass the outermost heat exchange pipe 8 of the heat exchange module. The medium channel of the buried pipe heat exchanger 4 is only connected to the medium channel inside the outermost heat exchange pipe 8. In this case, the hot water produced by the heat pump unit can be supplied to any heat exchange location other than the outermost heat exchange pipe 8. In some embodiments, the heat pump can supply the convection heat exchanger 9, the radiation heat exchanger 6, and all heat exchanger tubes of the heat exchange module except for the outermost heat exchange pipe 8. The function of the bypass device is to prevent the hot water produced by the heat pump unit from being supplied to the outermost heat exchange pipe 8 of the heat exchange module.

[0065] Heating System for Cascade Utilization of Medium-Deep Geothermal Energy - Example 7

[0066] like Figure 7 The diagram shown is a schematic representation of Embodiment 7 of the heating system for the cascade utilization of medium-deep geothermal energy provided by the present invention. Based on Embodiment 4, the indoor heat exchanger 15 of this embodiment is replaced by a three-medium heat exchanger instead of a fluorine-water heat exchanger.

[0067] Specifically, in this embodiment, the outdoor heat exchanger 14 includes an outdoor refrigerant channel 141 and an outdoor refrigerant channel 142, and the indoor heat exchanger 15 includes an indoor refrigerant channel 151, an indoor refrigerant channel 152, an indoor air flow channel 153, and an indoor fan 154. The indoor refrigerant channel 151 and the indoor refrigerant channel 152 are disposed in the indoor air flow channel 153. The indoor fan 154 is used to drive the air in the indoor air flow channel 153 to exchange heat with the indoor refrigerant channel 151 and / or the indoor refrigerant channel 152. The indoor refrigerant channel 151 is connected to the radiant heat exchanger 6. A circulation pump 3 is provided on the pipeline connecting the indoor refrigerant channel 151 and the radiant heat exchanger 6. The outdoor refrigerant channel 141 is connected to the first circulation loop 1, and the outdoor refrigerant channel 142 and the indoor refrigerant channel 152 are both disposed on the second circulation loop 11. By configuring the indoor heat exchanger 15 as a three-medium heat exchanger, the indoor refrigerant passage 151 and / or the indoor refrigerant passage 152 can exchange heat with the indoor air, thereby providing hot air to the room.

[0068] Heating System for Cascade Utilization of Medium-Deep Geothermal Energy - Example 8

[0069] like Figure 8 The diagram shown is a schematic representation of Embodiment 8 of the heating system for the cascade utilization of medium-deep geothermal energy provided by the present invention. Based on Embodiment 5, the outdoor heat exchanger 14 of this embodiment is replaced by a fluorinated air heat exchanger instead of a fluorinated water heat exchanger, and the convection heat exchanger 9, radiation heat exchanger 6, inner heat exchange tube 7, and outer heat exchange tube 8 are connected in series.

[0070] Specifically, in this embodiment, the outdoor heat exchanger 14 includes an outdoor refrigerant passage 142, an outdoor air flow channel 143, and an outdoor fan 144, the outdoor refrigerant passage 142 is arranged in the outdoor air flow channel 143, the outdoor fan 144 is used to drive the air in the outdoor air flow channel 143 to exchange heat with the outdoor refrigerant passage 142, the indoor heat exchanger 15 includes an indoor carrier refrigerant passage 151 and an indoor refrigerant passage 152, the indoor carrier refrigerant passage 151, the convection heat exchanger 9, and the heat exchange module are connected in series, a circulating pump 3 is arranged on the pipeline between the indoor carrier refrigerant passage 151 and the convection heat exchanger, and the outdoor refrigerant passage 142 and the indoor refrigerant passage 152 are both arranged in series on the second circulating loop 11. The heat pump unit does not take hot water from the outer pipe outlet of the peripheral structure unit, but directly takes heat from the outdoor air, and does not need to be connected with the first circulating loop 1 through the outdoor heat exchanger 14 (therefore, the geothermal energy collection unit and the first circulating loop 1 are omitted in the figure). The circulating medium in the indoor carrier refrigerant passage 151 of the indoor heat exchanger 15 flows through the medium passages in the convection unit, the indoor unit, and the peripheral structure unit in turn, and at this time, the outer heat exchange pipe 8 is bypassed, and the hot water produced by the heat pump is not supplied to the outer heat exchange pipe 8.

[0071] Heat supply system for step-by-step utilization of medium-deep geothermal energy - embodiment 9

[0072] As shown in Figure 9 , it is a schematic diagram of the heat supply system for step-by-step utilization of medium-deep geothermal energy provided by the present application, embodiment 9. Based on the heat supply system for step-by-step utilization of medium-deep geothermal energy, embodiment 5, the outdoor heat exchanger 14 is replaced by a fluorine-air heat exchanger, and the convection heat exchanger 9, the radiation heat exchanger 6, the inner heat exchange pipe 7, and the outer heat exchange pipe 8 are connected in series.

[0073] Specifically, in this embodiment, the outdoor heat exchanger 14 includes an outdoor refrigerant passage 142, an outdoor air flow channel 143, and an outdoor fan 144, the outdoor refrigerant passage 142 is arranged in the outdoor air flow channel 143, the outdoor fan 144 is used to drive the air in the outdoor air flow channel 143 to exchange heat with the outdoor refrigerant passage 142, the indoor heat exchanger 15 includes an indoor carrier refrigerant passage 151 and an indoor refrigerant passage 152, the indoor carrier refrigerant passage 151 is connected in parallel with the radiant heat exchanger 6, and the outdoor refrigerant passage 142 and the indoor refrigerant passage 152 are both arranged in series on the second circulating loop 11. The heat pump unit can take heat from the circulating medium outlet of the external envelope unit, and can also directly take heat from the outdoor air. The hot water in the indoor carrier refrigerant passage 151 of the indoor heat exchanger 15 flows through the convection unit, the indoor unit, and the external envelope unit in turn. When renewable power needs to be consumed, an air source heat pump heating mode can be run, hot water is prepared by using power to drive the heat pump to meet the indoor heating demand, at this time, the medium and deep geothermal energy does not need to be extracted, which is beneficial to the recovery of the soil and rock temperature and the long-term stable operation of the system. When renewable energy power does not need to be consumed, a direct heating mode of the ground heat exchanger can be run, at this time, the heat pump does not need to be used, and only circulating medium transmission and distribution energy needs to be consumed.

[0074] The two operation modes of the heat supply system with gradient utilization of medium and deep geothermal energy in this embodiment will be described below. Please refer to Figure 10 and Figure 11 .

[0075] Mode one-direct heating of the ground heat exchanger 4

[0076] As shown in Figure 10 , in this mode, the system only needs to consume circulating medium transmission and distribution energy, and does not need to use the heat pump to improve the energy grade.

[0077] Mode two-air source heat pump heating

[0078] As shown in Figure 11 , in this mode, the system can consume renewable energy power such as wind power and photovoltaic power, realize intermittent operation of the medium and deep ground heat exchanger, and is beneficial to the recovery of the soil and rock temperature field and the long-term stable operation of the system.

[0079] Heat supply system with gradient utilization of medium and deep geothermal energy-embodiment 10

[0080] As shown in Figure 12 , it is a schematic diagram of the heat supply system with gradient utilization of medium and deep geothermal energy provided by the present application, embodiment 10. The heat supply system with gradient utilization of medium and deep geothermal energy in this embodiment is based on embodiment 6, and the outdoor heat exchanger 14 is replaced by a three-medium heat exchanger.

[0081] Specifically, the outdoor heat exchanger 14 comprises an outdoor refrigerant passage 141, an outdoor refrigerant passage 142, an outdoor air flow channel 143, and an outdoor fan 144, the outdoor refrigerant passage 141 and the outdoor refrigerant passage 142 are both arranged in the outdoor air flow channel 143, the outdoor fan 144 is used to drive the air in the outdoor air flow channel 143 to exchange heat with the outdoor refrigerant passage 141 and / or the outdoor refrigerant passage 142, the outdoor refrigerant passage 141 is connected in series with the first circulation loop 1, and the outdoor refrigerant passage 142 is connected in series with the second circulation loop. By arranging the outdoor heat exchanger 14 as a three-medium heat exchanger, the outdoor refrigerant passage 141 and / or the indoor refrigerant passage 152 can exchange heat with outdoor air, thereby taking heat from outdoor air.

[0082] Heat supply system for step-by-step utilization of medium-deep geothermal energy - embodiment 11

[0083] As shown in Figure 13 , it is a schematic diagram of the heat supply system for step-by-step utilization of medium-deep geothermal energy provided by the present application, embodiment 11. The heat supply system for step-by-step utilization of medium-deep geothermal energy in this embodiment is based on embodiment 8, the outdoor heat exchanger is replaced by a three-medium heat exchanger, and heat exchange devices 17 are arranged in parallel at both ends of the outdoor heat exchanger 14. Specifically, in this embodiment, heat exchange devices 17 are arranged in parallel at both ends of the outdoor refrigerant passage 141 of the outdoor heat exchanger 14, a circulating pump 3 is arranged on the pipeline connected in parallel between the outdoor refrigerant passage 141 and the heat exchange devices 17, and the heat exchange devices 17 can be at least one of river, lake, sea water, cooling tower, shallow geothermal pipe, etc. The heat exchange devices 17 act as a cold source (heat dissipation device) for the heat pump in summer and a heat source (heat supply device) for the heat pump in winter. In summer, the heat pump operates in refrigeration mode to extract cold energy from the heat exchange devices 17 to produce cold water to meet the cooling demand; in winter, the heat pump operates in heating mode to extract heat from the heat exchange devices 17 to produce hot water to meet the heating demand.

[0084] Air conditioning system for step-by-step utilization of medium-deep geothermal energy - embodiment 1

[0085] As shown in Figure 14 , it is a schematic diagram of the air conditioning system for step-by-step utilization of medium-deep geothermal energy provided by the present application, embodiment 1. The air conditioning system for step-by-step utilization of medium-deep geothermal energy in this embodiment is based on the heat supply system for step-by-step utilization of medium-deep geothermal energy, embodiment 6, and a four-way reversing valve 16 is arranged on the second circulation loop 11 to switch the flow direction of the refrigerant. By arranging the four-way reversing valve 16, the flow direction of the refrigerant in the second circulation loop 11 can be switched, so that the heat pump unit can be switched between heating and cooling modes.

[0086] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A heating system for the cascade utilization of medium-deep geothermal energy, characterized in that, include: At least one outer enclosure structure unit, the outer enclosure structure unit includes an outer enclosure mounting base, the outer enclosure mounting base is provided with a heat exchange module, the heat exchange module includes an inner heat exchange tube and an outer heat exchange tube connected in sequence, and both the inner heat exchange tube and the outer heat exchange tube are provided with a medium channel; The first circulation loop, wherein the heat exchange module is connected to the first circulation loop, and in the case of multiple outer enclosure structure units, the heat exchange modules of the multiple outer enclosure structure units are connected in parallel with each other; A geothermal energy collection unit, comprising at least one buried pipe heat exchanger for collecting heat from medium-deep rock strata, wherein the buried pipe heat exchanger is provided with a medium channel and is connected to the first circulation loop. An indoor unit, the indoor unit including an indoor mounting base, the indoor mounting base being provided with a radiant heat exchanger, the radiant heat exchanger being provided with a medium channel; A convection unit, comprising a convection heat exchanger and a convection fan, wherein the convection heat exchanger is provided with a medium channel; The convective heat exchanger is connected in series with the radiative heat exchanger, and the buried pipe heat exchanger, the convective heat exchanger, the radiative heat exchanger, the inner heat exchange tube, and the outer heat exchange tube are connected in series in sequence to form a loop; or, the convective heat exchanger is connected in parallel with the radiative heat exchanger, and the buried pipe heat exchanger, the parallel convective heat exchanger, the radiative heat exchanger, the inner heat exchange tube, and the outer heat exchange tube are connected in series in sequence to form a loop.

2. A heating system for the cascade utilization of medium-deep geothermal energy, characterized in that, include: At least one outer enclosure structure unit, the outer enclosure structure unit includes an outer enclosure mounting base, the outer enclosure mounting base is provided with a heat exchange module, the heat exchange module includes an inner heat exchange tube and an outer heat exchange tube connected in sequence, and both the inner heat exchange tube and the outer heat exchange tube are provided with a medium channel; The first circulation loop, wherein the heat exchange module is connected to the first circulation loop, and in the case of multiple outer enclosure structure units, the heat exchange modules of the multiple outer enclosure structure units are connected in parallel with each other; A geothermal energy collection unit, comprising at least one buried pipe heat exchanger for collecting heat from medium-deep rock strata, wherein the buried pipe heat exchanger is provided with a medium channel and is connected to the first circulation loop. An indoor unit, the indoor unit including an indoor mounting base, the indoor mounting base being provided with a radiant heat exchanger, the radiant heat exchanger being provided with a medium channel; A heat pump unit includes a second circulation loop, a compressor, a throttling device, an outdoor heat exchanger, and an indoor heat exchanger. The compressor and the throttling device are both installed on the second circulation loop. The outdoor heat exchanger includes an outdoor refrigerant channel and an outdoor refrigerant channel. The indoor heat exchanger includes an indoor refrigerant channel and an indoor refrigerant channel. The compressor, the indoor refrigerant channel, and the outdoor refrigerant channel are connected in sequence to form a loop. The buried pipe heat exchanger, the inner heat exchange pipe, the outer heat exchange pipe, and the outdoor refrigerant channel are connected in sequence to form a loop; the indoor refrigerant channel and the radiant heat exchanger are connected in sequence to form a loop.

3. The heating system for cascade utilization of medium-deep geothermal energy according to claim 2, characterized in that, Also includes: The convection unit includes a convection heat exchanger and a convection fan. The convection heat exchanger has a medium channel. The indoor refrigerant channel, the convection heat exchanger, and the radiant heat exchanger are connected in sequence to form a loop.

4. The heating system for cascade utilization of medium-deep geothermal energy according to claim 3, characterized in that, In the convection heat exchanger, the radiation heat exchanger, and the heat exchange module, a bypass device is provided between the outer heat exchange tubes.

5. The heating system for cascade utilization of medium-deep geothermal energy according to claim 4, characterized in that, The outdoor heat exchanger also includes an outdoor air flow channel and an outdoor fan. The outdoor refrigerant channel and the outdoor refrigerant channel are both located in the outdoor air flow channel. The outdoor fan is used to drive the air in the outdoor air flow channel to exchange heat with the outdoor refrigerant channel and / or the outdoor refrigerant channel.

6. The heating system for cascade utilization of medium-deep geothermal energy according to claim 2, characterized in that, The indoor heat exchanger is a three-medium heat exchanger. The indoor heat exchanger also includes an indoor air flow channel and an indoor fan. The indoor refrigerant channel and the indoor refrigerant channel are both located in the indoor air flow channel. The indoor fan is used to drive the air in the indoor air flow channel to exchange heat with the indoor refrigerant channel and / or the indoor refrigerant channel.

7. A heating system for the cascade utilization of medium-deep geothermal energy, characterized in that, include: At least one outer enclosure structure unit, the outer enclosure structure unit includes an outer enclosure mounting base, the outer enclosure mounting base is provided with a heat exchange module, the heat exchange module includes an inner heat exchange tube and an outer heat exchange tube connected in sequence, and both the inner heat exchange tube and the outer heat exchange tube are provided with a medium channel; An indoor unit, the indoor unit including an indoor mounting base, the indoor mounting base being provided with a radiant heat exchanger, the radiant heat exchanger being provided with a medium channel; The convection unit includes a convection heat exchanger and a convection fan, and the convection heat exchanger has a medium channel. A heat pump unit includes a second circulation loop, a compressor, a throttling device, an outdoor heat exchanger, and an indoor heat exchanger. The compressor and the throttling device are both located in the second circulation loop. The outdoor heat exchanger includes an outdoor refrigerant channel, an outdoor fan, and an outdoor airflow channel. The outdoor refrigerant channel is located within the outdoor airflow channel. The outdoor fan drives the air in the outdoor airflow channel to exchange heat with the outdoor refrigerant channel. The indoor heat exchanger includes an indoor refrigerant channel and an indoor refrigerant channel. The compressor, the indoor refrigerant channel, and the outdoor refrigerant channel are connected in sequence to form a loop. The indoor refrigerant channel, the convection heat exchanger, the inner heat exchange tube of the radiant heat exchanger, and the outer heat exchange tube are connected in sequence to form a loop. A bypass device is provided between the convection heat exchanger, the radiant heat exchanger, and the heat exchange module, except that the outer heat exchange tube is provided.

8. The heating system for cascade utilization of medium-deep geothermal energy according to claim 7, characterized in that, The outdoor heat exchanger also includes an outdoor refrigerant channel, which is located in the outdoor air flow channel. The outdoor fan is used to drive the air in the outdoor air flow channel to exchange heat with the outdoor refrigerant channel and / or the outdoor refrigerant channel. It also includes a heat exchange device, which is connected in parallel with the outdoor refrigerant channel.

9. A heating system for the cascade utilization of medium-deep geothermal energy, characterized in that, include: At least one outer enclosure structure unit, the outer enclosure structure unit includes an outer enclosure mounting base, the outer enclosure mounting base is provided with a heat exchange module, the heat exchange module includes an inner heat exchange tube and an outer heat exchange tube connected in sequence, and both the inner heat exchange tube and the outer heat exchange tube are provided with a medium channel; The first circulation loop, wherein the heat exchange module is connected to the first circulation loop, and in the case of multiple outer enclosure structure units, the heat exchange modules of the multiple outer enclosure structure units are connected in parallel with each other; A geothermal energy collection unit, comprising at least one buried pipe heat exchanger for collecting heat from medium-deep rock strata, wherein the buried pipe heat exchanger is provided with a medium channel and is connected to the first circulation loop. An indoor unit, the indoor unit including an indoor mounting base, the indoor mounting base being provided with a radiant heat exchanger, the radiant heat exchanger being provided with a medium channel; A convection unit, comprising a convection heat exchanger and a convection fan, wherein the convection heat exchanger is provided with a medium channel; A heat pump unit includes a second circulation loop, a compressor, a throttling device, an outdoor heat exchanger, and an indoor heat exchanger. The compressor and the throttling device are both located in the second circulation loop. The outdoor heat exchanger is a refrigerant-air heat exchanger, which includes an outdoor refrigerant channel, an outdoor fan, and an outdoor airflow channel. The outdoor refrigerant channel is located within the outdoor airflow channel, and the outdoor fan drives the air in the outdoor airflow channel to exchange heat with the outdoor refrigerant channel. The indoor heat exchanger includes an indoor refrigerant channel and an indoor refrigerant channel. The compressor, the indoor refrigerant channel, and the outdoor refrigerant channel are connected in sequence to form a loop. The indoor refrigerant channel, the convection heat exchanger, the radiation heat exchanger, the inner heat exchange tube, and the outer heat exchange tube are connected in sequence to form a loop. The buried pipe heat exchanger is connected to the inlet end of the convection heat exchanger, the inner heat exchange tube, and the outer heat exchange tube, and the outlet end of the outer heat exchange tube is connected to the buried pipe heat exchanger.

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