Heating system

Abstract

This disclosure provides a heating system comprising: an absorption heat pump (32) including a heat-releasing end (40), a heat-absorbing end (42), and a drive end (44); a terminal (34) configured to be thermally connected to the heat-releasing end (40); an underground heat exchanger (36) for use buried in underground soil and configured to be thermally connected to the heat-absorbing end (42); and a collector (38) configured to be thermally connected to the drive end (44) and thermally connected to the terminal (34) via the underground heat exchanger (36). Thus, the heating system avoids the waste of high-grade energy and has good economic efficiency and stability.

Description

Technical Field

[0001] This disclosure relates to the field of heating, and more specifically to a heating system. Background Technology

[0002] Solar district heating refers to a technology that uses solar energy as a heat source to supply heating or domestic hot water to users in a specific area through a heating network. It is characterized by being clean, pollution-free, and having low operating costs. Widespread adoption of solar district heating technology would bring considerable energy-saving, environmental, and social benefits. However, the inherent instability, discontinuity, and seasonal imbalance of solar energy resources limit its large-scale application in the heating sector. In particular, the seasonal distribution of solar energy, characterized by "summer abundance and winter deficiency," results in a series of problems such as low energy utilization efficiency and low equipment utilization rates in solar heating systems, affecting the system's economic viability.

[0003] Combining seasonal soil heat storage with solar district heating can effectively address the seasonal imbalance of solar energy resources, improving system efficiency and economy. For example, Chinese invention patent application CN117213103A discloses a solar heat pump system for seasonal heat storage. The heat collector is connected to the heat exchanger via pipes, and the heat exchanger is connected to the heat pump via pipes; the pipes include a second inlet pipe and a second outlet pipe. The heat storage unit is connected to both the second inlet and outlet pipes via pipes. However, the heat pump is an electric heat pump, requiring high-grade electricity, resulting in degraded energy utilization. Furthermore, although the heat pump can use photovoltaic power, considering the continuity of building heating, electricity still needs to be drawn from the grid at night when there is no photovoltaic power. Adding energy storage equipment would require additional investment, increasing the system cost. Summary of the Invention

[0004] This disclosure is made in view of the state of the prior art described above. The object of this disclosure is to provide a heating system that overcomes or mitigates at least one of the disadvantages described in the background section.

[0005] To achieve the above objectives, the present disclosure may adopt the following technical solutions.

[0006] This application proposes a heating system, comprising:

[0007] An absorption heat pump, comprising a heat-releasing end, a heat-absorbing end, and a driving end;

[0008] The end is configured to be thermally connected to the heat-generating end;

[0009] An underground heat exchanger, the underground heat exchanger being used buried in underground soil and configured to be thermally connected to the heat-absorbing end; and

[0010] A solar collector configured to be thermally connected to the drive end and to be thermally connected to the end via the underground heat exchanger.

[0011] In at least one possible implementation, the heating system further includes a first intermediate heat exchanger, the collector being configured to be thermally connected to the underground heat exchanger via the first intermediate heat exchanger.

[0012] In at least one possible implementation, the heating system further includes a heat collection loop for circulating a first heat transfer medium, wherein the drive end, the heat collector, and the first intermediate heat exchanger are disposed on the heat collection loop.

[0013] In at least one possible implementation, the heating system further includes a heating circuit for circulating a second heat transfer medium, wherein the heat-releasing end, the heat-absorbing end, the terminal end, the underground heat exchanger, and the first intermediate heat exchanger are disposed on the heating circuit.

[0014] In at least one possible implementation, the solar collector is configured to be disconnected from one of the drive end and the underground heat exchanger while being thermally connected to the other.

[0015] In at least one possible implementation, the underground heat exchanger is configured to be disconnected from one of the heat-absorbing end and the end when thermally connected to the other.

[0016] In at least one possible implementation, the end is configured to be disconnectable from one of the heat-generating end and the underground heat exchanger when thermally connected to the other.

[0017] In at least one possible implementation, the collector is configured to be thermally connected between the end and the underground heat exchanger.

[0018] In at least one possible implementation, the heating system further includes a second intermediate heat exchanger, the collector being configured to be thermally connected between the end and the underground heat exchanger via the second intermediate heat exchanger.

[0019] In at least one possible implementation, the heating system further includes a heat storage unit, the heat collector being configured to be thermally connected via the heat storage unit to the drive end and the underground heat exchanger.

[0020] Using the above technical solution, the absorption heat pump can be driven by the heat energy provided by the collector without consuming electricity, thus avoiding the waste of high-grade energy. Furthermore, the heating system does not require electrical equipment such as inverters and combiner boxes, resulting in better economic efficiency and stability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a heating system according to an embodiment of the present disclosure.

[0022] Explanation of reference numerals in the attached figures

[0023] 30 Heating System

[0024] 32 Absorption Heat Pump

[0025] 34 End

[0026] 36. Underground heat exchanger

[0027] 38 Solar collectors

[0028] 40 Heat dissipation end

[0029] 42 Absorbing end

[0030] 44 Driver End

[0031] 46 First intermediate heat exchanger

[0032] 48 Heat collection circuit

[0033] 50 heating circuits

[0034] 52 Thermal Storage Unit

[0035] 54 Second intermediate heat exchanger

[0036] 56 Episode 1 Hot Branch

[0037] 58 Episode 2 Hot Branch

[0038] 60 First Valve

[0039] 62 Second Valve

[0040] 64 First Heating Branch

[0041] 66 Second heating branch

[0042] 68 Third Valve

[0043] 70 Fourth Valve

[0044] 72 Third Heating Branch

[0045] 74 Fifth Valve

[0046] 76 First Bypass

[0047] 78 Second Bypass

[0048] 80 Part One

[0049] 82 Part Two

[0050] 84 Sixth Valve

[0051] 86 Seventh Valve

[0052] 88 Eighth Valve

[0053] 90 Episode 3 Hot Branch

[0054] 92 Ninth Valve

[0055] 94 Third Bypass

[0056] 96 Part Three

[0057] 98 Tenth Valve

[0058] 100 Eleventh Valve

[0059] 102 First thermal storage input terminal

[0060] 104 First thermal storage output terminal

[0061] 106 Second thermal storage input terminal

[0062] 108 Second thermal storage output terminal

[0063] 110 First Pump

[0064] 112 Second Pump

[0065] 114 Twelfth Valve

[0066] 116 Third Pump Detailed Implementation

[0067] like Figure 1 As shown, this disclosure provides a heating system 30.

[0068] The heating system 30 includes an absorption heat pump 32, a terminal 34, an underground heat exchanger 36, and a collector 38. The absorption heat pump 32 includes a heat-releasing end 40, a heat-absorbing end 42, and a driving end 44. The terminal 34 is configured to be thermally connected to the heat-releasing end 40. The underground heat exchanger 36 is for use buried in underground soil and is configured to be thermally connected to the heat-absorbing end 42. The collector 38 is configured to be thermally connected to the driving end 44 and can be thermally connected to the terminal 34 via the underground heat exchanger 36. It should be understood that the collector 38 does not necessarily need to be thermally connected to both the driving end 44 and the underground heat exchanger 36 simultaneously. The underground heat exchanger 36 can use soil as one of its heat transfer media (i.e., a heat storage or heat release material).

[0069] In the technical solutions provided in this disclosure, the absorption heat pump 32 can be driven by the heat energy provided by the collector 38 without consuming electrical energy, thereby avoiding the waste of high-grade energy. Furthermore, the heating system 30 does not require electrical equipment such as inverters and combiner boxes, enabling the heating system 30 to have better economic efficiency and stability.

[0070] It is understandable that the soil here can be a natural or man-made underground environment mainly composed of soil, or a natural or man-made underground environment mainly composed of sand, or a natural or man-made underground environment mainly composed of one or more of soil, sand, gravel, and stones.

[0071] In some examples, end 34 includes a heat sink (not shown in the figure).

[0072] In some examples, the underground heat exchanger 36 includes a buried pipe, such as a U-tube buried pipe heat exchanger, a coaxial buried pipe heat exchanger, or a horizontal pipe buried pipe heat exchanger.

[0073] In some examples, the underground heat exchanger 36 includes polyethylene (PE), such as heat-resistant polyethylene (PE-RT).

[0074] In some examples, collector 38 is a trough collector.

[0075] In some examples, the heating system 30 also includes a first intermediate heat exchanger 46. The collector 38 is configured to be thermally connected to the underground heat exchanger 36 via the first intermediate heat exchanger 46.

[0076] In some examples, the first intermediate heat exchanger 46 is a plate heat exchanger.

[0077] In some examples, the heating system 30 also includes a heat collection loop 48 for circulating a first heat transfer medium. The drive end 44, the heat collector 38, and the first intermediate heat exchanger 46 are disposed on the heat collection loop 48.

[0078] In some examples, the first heat transfer medium includes water.

[0079] In some examples, the heating system 30 also includes a heating loop 50 for circulating a second heat transfer medium. A heat-releasing end 40, a heat-absorbing end 42, an end 34, an underground heat exchanger 36, and a first intermediate heat exchanger 46 are disposed on the heating loop 50.

[0080] In some examples, the second heat transfer medium includes water.

[0081] In some examples, the collector 38 is configured to be disconnected from one of the drive end 44 and the underground heat exchanger 36 while being thermally connected to the other.

[0082] In some examples, the heat collection loop 48 includes a first heat collection branch 56 and a second heat collection branch 58. The first heat collection branch 56 and the second heat collection branch 58 are connected in parallel between the input and output terminals of the heat collector 38. The heating system 30 also includes one or more first valves 60, with the first intermediate heat exchanger 46 and the first valve 60 connected in series on the first heat collection branch 56. The heating system 30 also includes one or more second valves 62, with the drive end 44 and the second valve 62 connected in series on the second heat collection branch 58.

[0083] In some examples, on the first heat collection branch 56, the first intermediate heat exchanger 46 is connected in series between the two first valves 60.

[0084] In some examples, on the second heat collection branch 58, the drive end 44 is connected in series between the two second valves 62.

[0085] In some examples, the underground heat exchanger 36 is configured to be disconnected from one of the heat absorption end 42 and the end end 34 while being thermally connected to the other.

[0086] In some examples, the heating circuit 50 includes a first heating branch 64 and a second heating branch 66. The first heating branch 64 and the second heating branch 66 are connected in parallel between the input and output of the underground heat exchanger 36. The heating system 30 also includes one or more third valves 68, with the heat absorption end 42 and the third valve 68 connected in series on the first heating branch 64. The heating system 30 also includes one or more fourth valves 70, with the end 34 and the fourth valve 70 connected in series on the second heating branch 66.

[0087] In some examples, on the first heating branch 64, the heat absorption end 42 is connected in series between two third valves 68.

[0088] In some examples, on the second heating branch 66, the end 34 is connected in series between two fourth valves 70.

[0089] In some examples, the underground heat exchanger 36 is configured to be disconnected from the first intermediate heat exchanger 46 when it is thermally connected to one of the heat absorption end 42 and the end end 34.

[0090] In some examples, the heating circuit 50 also includes a third heating branch 72. The first heating branch 64, the second heating branch 66, and the third heating branch 72 are connected in parallel between the input and output of the underground heat exchanger 36. The heating system 30 also includes one or more fifth valves 74, with the first intermediate heat exchanger 46 and the fifth valves 74 connected in series on the third heating branch 72.

[0091] In some examples, on the third heating branch 72, the first intermediate heat exchanger 46 is connected in series between the two fifth valves 74.

[0092] In some examples, the heating system 30 also includes a first pump 110. The first pump 110 is disposed on the heating circuit 50 and is configured to drive a second heat transfer medium to circulate within the heating circuit 50.

[0093] In some examples, on the heating circuit 50, the first pump 110 is located between the underground heat exchanger 36 and the first heating branch 64, the second heating branch 66 and the third heating branch 72, for example, it can be located between the input end of the underground heat exchanger 36 and the output end of the first heating branch 64, the second heating branch 66 and the third heating branch 72.

[0094] In some examples, end 34 is configured to be disconnected from one of the heat-generating end 40 and the underground heat exchanger 36 while being thermally connected to the other.

[0095] In some examples, the heat dissipation end 40 is located on the second heating branch 66 and connected in series between the output end of the underground heat exchanger 36 and the input end of the terminal 34.

[0096] In some examples, on the second heating branch 66, the heat dissipation end 40 is connected in series between two fourth valves 70.

[0097] In some examples, the heating circuit 50 also includes a first bypass 76 and a second bypass 78. The second heating branch 66 includes a first section 80 and a second section 82 connected in series between two fourth valves 70. The heating system 30 also includes one or more sixth valves 84, a seventh valve 86, and an eighth valve 88. A heat-dissipating end 40 and a sixth valve 84 are connected in series on the first section 80, and an end 34 is disposed on the second section 82. The seventh valve 86 is disposed on the first bypass 76, and the eighth valve 88 is disposed on the second bypass 78. The first bypass 76 is connected in parallel with the first section 80. The input of the second bypass 78 is connected between the output of one fourth valve 70 and the input of the first section 80, and the output of the second bypass 78 is connected between the input of the other fourth valve 70 and the output of the second section 82.

[0098] In some examples, on the first section 80, the heat-dissipating end 40 is connected in series between two sixth valves 84.

[0099] In some examples, the collector 38 is configured to be thermally connected between the end 34 and the underground heat exchanger 36.

[0100] In some examples, the heating system 30 also includes a second intermediate heat exchanger 54. The collector 38 is configured to be thermally connected between the terminal 34 and the underground heat exchanger 36 via the second intermediate heat exchanger 54.

[0101] In some examples, the second intermediate heat exchanger 54 is a plate heat exchanger.

[0102] In some examples, the collector circuit 48 also includes a third collector branch 90. The first collector branch 56, the second collector branch 58, and the third collector branch 90 are connected in parallel between the input and output of the collector 38. The heating system 30 also includes one or more ninth valves 92, with the second intermediate heat exchanger 54 and the ninth valve 92 connected in series with the third collector branch 90.

[0103] In some examples, on the third heat collection branch 90, the second intermediate heat exchanger 54 is connected in series between the two ninth valves 92.

[0104] In some examples, the second intermediate heat exchanger 54 is disposed on the second heating branch 66 and connected in series between the output of the underground heat exchanger 36 and the input of the terminal 34.

[0105] In some examples, on the second heating branch 66, the second intermediate heat exchanger 54 is connected in series between the two fourth valves 70.

[0106] In some examples, the heating circuit 50 also includes a third bypass 94. The second heating branch 66 also includes a third section 96 connected in series between the two fourth valves 70. The heating system 30 also includes one or more tenth valves 98 and eleventh valves 100. The second intermediate heat exchanger 54 and the tenth valve 98 are connected in series on the third section 96, and the eleventh valve 100 is disposed on the third bypass 94. The first section 80 is connected in parallel with the first bypass 76.

[0107] In some examples, on the second heating branch 66, the third section 96 is connected in series between the first section 80 and the second section 82.

[0108] In some examples, on the third section 96, the second intermediate heat exchanger 54 is connected in series between the two tenth valves 98.

[0109] In some examples, the heating system 30 also includes a heat storage unit 52. The collector 38 is configured to be thermally connected to the drive end 44 and the underground heat exchanger 36 via the heat storage unit 52.

[0110] In some examples, the heat storage unit 52 is configured to contain a first heat transfer medium; for example, the heat storage unit 52 may include a housing for containing the first heat transfer medium.

[0111] In some examples, the thermal storage unit 52 is disposed on the collector circuit 48 and includes a first thermal storage input terminal 102, a first thermal storage output terminal 104, a second thermal storage input terminal 106, and a second thermal storage output terminal 108. The output terminal of the collector 38 is connected to the first thermal storage input terminal 102 and the first thermal storage output terminal 104 in sequence. The second thermal storage output terminal 108 is connected to the second thermal storage input terminal 106 via a first collector branch 56, a second collector branch 58, and a third collector branch 90. In other words, on the collector circuit 48, the thermal storage unit 52 separates the collector 38 from the first collector branch 56, the second collector branch 58, and the third collector branch 90.

[0112] In other examples, the collector circuit 48 may include a fourth collector branch. The fourth collector branch may be connected in parallel with the first collector branch 56, the second collector branch 58, and the third collector branch 90 between the input and output terminals of the collector 38, and the heat storage unit 52 may be disposed on the fourth collector branch.

[0113] In some examples, the heating system 30 also includes a second pump 112. The second pump 112 is disposed on the collector circuit 48 and is configured to drive the first heat transfer medium to circulate between the collector 38 and the storage tank 52.

[0114] In some examples, the second pump 112 is disposed between the collector 38 and the storage tank 52. For example, the second pump 112 may be disposed between the input end of the collector 38 and the first storage output end 104 of the storage tank 52.

[0115] In some examples, the heating system 30 also includes a twelfth valve 114. The twelfth valve 114 is disposed on the collector circuit 48 and located between the collector 38 and the storage tank 52. For example, the second pump 112 and the twelfth valve 114 may be connected in series between the collector 38 and the storage tank 52.

[0116] In some examples, the heating system 30 also includes a third pump 116. The third pump 116 is disposed on the heat collection circuit 48 and is configured to drive the first heat transfer medium to circulate between the heat storage 52 and the first heat collection branch 56, the second heat collection branch 58 and the third heat collection branch 90.

[0117] In some examples, the third pump 116 is disposed between the heat storage 52 and the first heat collection branch 56, the second heat collection branch 58 and the third heat collection branch 90. For example, the third pump 116 may be disposed between the second heat storage output terminal 108 and the input terminal of the first heat collection branch 56, the second heat collection branch 58 and the third heat collection branch 90.

[0118] In some examples, the heating system 30 can switch between a heat storage mode and a heating mode. For example, in heat storage mode, the valves and pumps in the heating system 30 can be opened according to the conditions in Table 1; in heating mode, the valves and pumps in the heating system 30 can be opened according to the conditions in Table 2. In Tables 1 and 2, temperature refers to the temperature of the heat transfer medium at approximately the corresponding location. The predetermined temperature may be different for different objects, and the predetermined temperature for the same object may also be different in different modes. Furthermore, for cases where no opening conditions are given or the opening conditions are not met, the corresponding pump or valve is in the closed state.

[0119] Table 1

[0120]

[0121] Table 2

[0122]

[0123]

[0124] When the heating system 30 is operating in heat storage mode, the collector 38 can store heat in the heat storage unit 52 for a short period of time, for example, on a sunny day. After the heat storage unit 52 has stored a certain amount of heat, it can store the heat in the soil through the first intermediate heat exchanger 46 and the underground heat exchanger 36.

[0125] When the heating system 30 operates in heating mode, in one heating method, the terminal 34 can extract heat stored in the soil via the underground heat exchanger 36. In another heating method, the heat storage tank 52 can reheat the second heat transfer medium flowing from the underground heat exchanger 36 to the terminal 34 via the second intermediate heat exchanger 54. In yet another heating method, when the underground heat exchanger 36 is insufficient to directly heat the terminal 24, the heat storage tank 52 can drive the absorption heat pump 32, which can extract low-grade heat from the soil via the underground heater 36, thereby allowing the underground heat exchanger 36 to indirectly supply heat to the terminal 34 via the absorption heat pump 32. In other words, in the latter two heating methods described above, the collector 38 can still store heat in the heat storage tank 52 for a short period.

[0126] In actual use, the first operating year can be used as a preheating period, during which the heating system 30 can operate in heat storage mode throughout the first operating year. In subsequent operating years, the heating system 30 can operate in heat storage mode and heating mode according to the season. For example, the heating system 30 can operate in heat storage mode during the non-heating season and in heating mode during the heating season.

[0127] The terminology used in the embodiments of this disclosure is for illustrative purposes only and is not intended to limit the disclosure. Unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure should be understood in their ordinary sense by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar words used in this specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," and similar words mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects. "Upper," "lower," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. "A plurality" refers to two or more, unless otherwise expressly defined.

[0128] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A heating system, characterized in that include: An absorption heat pump (32) includes a heat release end (40), a heat absorption end (42), and a drive end (44). End (34), the end (34) is configured to be thermally connected to the heat-dissipating end (40); An underground heat exchanger (36) is used for burial in underground soil and is configured to be thermally connected to the heat-absorbing end (42). as well as The collector (38) is configured to be thermally connected to the drive end (44) and to the end end (34) via the underground heat exchanger (36). The heating system further includes a second intermediate heat exchanger (54), and the collector (38) is configured to be thermally connected via the second intermediate heat exchanger (54) between the terminal (34) and the underground heat exchanger (36). The heating system (30) includes a first heating branch (64) and a second heating branch (66). The terminal (34) and the fourth valve (70) are connected in series on the second heating branch (66). The second heating branch (66) includes a first part (80), a second part (82) and a third part (96) connected in series between the two fourth valves (70). The heat release end (40) is connected in series on the first part (80). The terminal (34) is located on the second part (82). On the third part (96), the second intermediate heat exchanger (54) is connected in series between the two tenth valves (98). On the second heating branch (66), the third part (96) is connected in series between the first part (80) and the second part (82).

2. The heating system according to claim 1, characterized in that The heating system also includes a first intermediate heat exchanger (46), and the collector (38) is configured to be thermally connected to the underground heat exchanger (36) via the first intermediate heat exchanger (46).

3. The heating system according to claim 2, characterized in that The heating system also includes a heat collection circuit (48) for circulating the first heat transfer medium, and the drive end (44), the heat collector (38) and the first intermediate heat exchanger (46) are disposed on the heat collection circuit (48).

4. The heating system according to claim 2, wherein The heating system also includes a heating circuit (50) for circulating a second heat transfer medium, and the heat release end (40), the heat absorption end (42), the end (34), the underground heat exchanger (36) and the first intermediate heat exchanger (46) are arranged on the heating circuit (50).

5. The heating system according to any one of claims 1 to 4, characterized in that, The collector (38) is configured to be disconnected from one of the drive end (44) and the underground heat exchanger (36) when they are in thermal connection.

6. The heating system according to any one of claims 1 to 4, characterized in that, The underground heat exchanger (36) is configured to be disconnected from one of the heat-absorbing end (42) and the end (34) when it is in thermal connection with the other.

7. The heating system according to any one of claims 1 to 4, characterized in that, The end (34) is configured to be disconnected from one of the heat-generating end (40) and the underground heat exchanger (36) when thermally connected to the other.

8. The heating system according to any one of claims 1 to 4, characterized in that, The heating system also includes a heat storage unit (52), and the heat collector (38) is configured to be thermally connected via the heat storage unit (52) to the drive end (44) and the underground heat exchanger (36).

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