Indoor heat utilization system

Abstract

To improve efficiency of energy of intake / exhaust air.SOLUTION: The invention relates to an indoor heat utilization system including an intake part and an exhaust part. The intake part and the exhaust part are provided at positions spaced apart from each other in an indoor space. The intake part includes an intake side heat exchanger. The exhaust part includes an exhaust side heat exchanger. The intake side heat exchanger and the exhaust side heat exchanger are connected by a heat medium circuit. The heat medium circuit sends a heat medium which has exchanged heat in the exhaust side heat exchanger to the intake side heat exchanger to perform heat exchange. The above object is achieved by the indoor heat utilization system.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an indoor heat utilization system equipped with a heat exchange system in a room having an air intake and an air exhaust port at separate locations, which sends cold or hot heat discarded outside through the exhaust port to the air intake side. [Background technology]

[0002] BACKGROUND ART Conventionally, a ventilation fan for indoor ventilation has been known, as disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2017-172950 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional indoor ventilation fans only exhaust air, and the exhausted indoor air is replaced by outside air. When there is a temperature difference between the room temperature and the outside air due to heating or cooling, exhausting the indoor air means throwing the air heated or cooled by the heating or cooling device outside, which is energy inefficient. An object of the present invention is to improve the energy efficiency of intake and exhaust. [Means for solving the problem]

[0005] In view of these problems, the present invention has solved the problems by providing an indoor heat utilization system comprising an intake section and an exhaust section, the intake section and the exhaust section being located at separate positions indoors, the intake section comprising an intake-side heat exchanger, the exhaust section comprising an exhaust-side heat exchanger, the intake-side heat exchanger and the exhaust-side heat exchanger being connected by a heat medium circuit, and the heat medium circuit sends the heat medium that has undergone heat exchange in the exhaust-side heat exchanger to the intake-side heat exchanger for heat exchange. [Effects of the Invention]

[0006] The indoor heat utilization system of the present invention contributes to energy conservation. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a conceptual diagram of an indoor heat utilization system according to a first embodiment. [Figure 2] FIG. 2 is a conceptual diagram of an indoor heat utilization system according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same reference numerals in different drawings denote parts with the same functions, and duplicated descriptions in each drawing will be omitted as appropriate.

[0009] [Example 1] (Outline of indoor heat utilization system) FIG. 1 is a conceptual diagram of an indoor heat utilization system 1 according to a first embodiment. A room 71, which represents one room in a building 7, is equipped with an exhaust section 2A and an intake section 2B. The exhaust section 2A and the intake section 2B are provided at separate locations within the room. In FIG. 1, the exhaust section 2A is provided on the right wall surface 7B, and the intake section 2B is provided on the left wall surface 7A. As described above, the exhaust section 2A and the intake section 2B may be provided at separate positions in the room, and may be provided at separate positions on the right wall surface 7B. The exhaust section 2A and the intake section 2B may be separated from each other to such an extent that the air exhausted from the exhaust section 2A is not sucked into the intake section 2B.

[0010] The intake section 2B contains an intake-side heat exchanger 1B, and the exhaust section 2A contains an exhaust-side heat exchanger 1A. The exhaust-side heat exchanger 1A and the intake-side heat exchanger 1B are connected by an inlet pipe 12 (as seen from the exhaust side) and an outlet pipe 11 (as seen from the exhaust side), forming a heat medium cycle (heat medium circuit 13).

[0011] When exhausting heated / cooled indoor air, the exhaust-side heat exchanger 1A exchanges heat contained in the indoor air with a heat medium, thereby heating (in heating) or cooling (in cooling) the heat medium. The heat-exchanged heat medium is sent to the intake-side heat exchanger 1B through the inlet pipe 12 (seen from the exhaust side), and heats (in heating mode) or cools (in cooling mode) the outside air drawn in from the intake section 2B. The indoor heat utilization system 1 transfers heat from the exhausted indoor air to the intake air, thereby contributing to energy conservation. The heat medium that has exchanged heat in the intake-side heat exchanger 1B is sent to the exhaust-side heat exchanger 1A through an outflow pipe 11 (as viewed from the exhaust side).

[0012] [Example 2] The second embodiment is an example in which the indoor heat utilization system 1 itself also functions as an air conditioner that utilizes natural heat or waste heat. FIG. 2 is a conceptual diagram of an indoor heat utilization system 1 according to a second embodiment. (building) The heat medium circuit 13 shown in the first embodiment (FIG. 1) is installed in a room 71 of the building 7. The second embodiment differs from the first embodiment in that a third heat exchanger (1C1-1C2) is added to the heat medium circuit 13. The third heat exchanger 1C1 (heat pump) provided in the outflow pipe 11 (seen from the exhaust side) is a heat exchanger that uses the heat pump 9 as a heat source. The heat pump 9, which uses various heat supply sources 4 including outside air as a heat source, sends the heat medium circulating through the heat pump 9 to the third heat exchanger 1C1 to heat or cool the heat medium flowing through the heat medium circuit 13 (outflow pipe 11). The third heat exchanger 1C2 (natural heat / waste heat) uses natural heat or waste heat discharged from an appropriate heat utilization device as the heat supply source 4, and heats or cools the heat medium flowing through the heat medium circuit 13.

[0013] (heat medium) The heat medium may be different if it is suitable or unsuitable for the first heat supply system 51 (another heat source), the second heat supply system 52 (soil hot storage section), the third heat supply system 53 (soil cold storage section), the fourth heat supply system 54 (underground aquifer hot storage section), and the fifth heat supply system 55 (underground aquifer cold storage section). If a different heat medium is used, a new third heat exchanger is installed in addition to the third heat exchanger 1C1 (heat pump) and the third heat exchanger 1C2 (natural heat / waste heat) in the outflow pipe 11, and care is taken to prevent different heat media from mixing with each other. Furthermore, the heat medium flowing through the heat medium circuit 13 is selected from suitable heat mediums.

[0014] (heat source) The heat source 4 can be broadly divided into natural heat and waste heat. Natural heat includes cold heat storage units such as the soil cold storage unit 43 and the underground aquifer cold storage unit 45, as well as heat storage units such as the soil heat storage unit 42 and the underground aquifer heat storage unit 44. Heat can be stored in the cold storage unit or the heat storage unit by various means.

[0015] (underground aquifer) Aquifers suitable for heat storage, such as the underground aquifer hot storage unit 44 and the underground aquifer cold storage unit 45, require that the groundwater does not flow much throughout the year, but there are many layers of aquifers underground, and sometimes an aquifer suitable for heat storage can be found, such as groundwater accumulated in an impermeable layer in a depression. The more groundwater accumulated, the higher the heat storage capacity, which contributes to energy conservation. In the case of underground aquifers with large heat capacities, it is possible to collect heat in the summer and use it throughout the winter. The underground aquifer cold storage unit 45 can also freeze groundwater. The heat of melting of ice is 333.6 kJ / kg, and freezing groundwater can significantly increase the heat capacity that can be stored.

[0016] (Soil heat storage section) The soil heat storage units such as the soil heat storage unit 42 and the soil cold storage unit 43 store cold or hot heat in the soil itself or in a heat storage material buried underground. The basement of a building 7 where rainwater does not penetrate, or the impermeable layer beneath a vast asphalt-paved parking lot of a store are preferable locations for the thermal storage unit. When the entire basement of a vast parking lot or building 7 is used as the thermal storage unit, it can be made into a thermal storage unit with an extremely large heat capacity.

[0017] In the case of soil thermal storage with a large thermal capacity, the heat collected in summer can be used throughout the winter. 2, in addition to the cold heat storage units such as the soil cold storage unit 43 and the underground aquifer cold storage unit 45, the heat storage units such as the soil heat storage unit 42 and the underground aquifer heat storage unit 44 are enclosed by frames, but this is for the sake of explanation. The heat storage units do not actually need to be enclosed by any structure. However, if the soil cold storage unit 43 or the soil hot storage unit 42 is an underground structure surrounded by heat insulating material, the heat storage performance will be improved. When a structure is used for the heat storage unit, the soil heat storage unit can be installed even in a permeable layer. Furthermore, the heat storage unit may contain a hot storage material or a cold storage material with a high heat capacity.

[0018] (heat storage source) In the summer, solar water heaters and heat transfer media running through pipes laid underground in the parking lot heated by sunlight are used as heat storage sources. Cooled heat transfer media flows through the parking lot from the pipe inlet, and hot heat transfer media is obtained from the pipe outlet. As a secondary effect, the parking lot is cooled, preventing problems such as deformation of the asphalt. It is also possible to use the waste heat from the refrigerator as a heat storage source.

[0019] In winter, snow melting devices on roofs and in parking lots are used as cold storage sources. Pipes installed under the roof or laid underground in the parking lot carry a heat transfer medium heated by groundwater or the like, which is used to melt snow. The heat transfer medium is then cooled and a low-temperature heat transfer medium is obtained from the outlet of the pipes. The heat storage source can also be waste heat from a boiler.

[0020] (Control unit) The control performed in Example 2 is complex, and using the control unit 8 is a preferred embodiment. When there are multiple heat storage units and heat utilization devices, the control unit 8 selects which of the first heat supply system 51 (other heat source), the second heat supply system 52 (soil heat storage unit), the third heat supply system 53 (soil cold storage unit), the fourth heat supply system 54 (underground aquifer heat storage unit), and the fifth heat supply system 55 (underground aquifer cold storage unit) to use. The control unit 8 is not absolutely necessary and can also be controlled manually. Each heat supply source 4 is provided with a temperature measuring unit (not shown) and sends the temperature of the heat medium that can be supplied to the control unit 8 or a display unit (not shown). A third heat exchanger (1C1 / 1C2) is provided in the outflow pipe 11 that sends the heat medium from the exhaust-side heat exchanger 1A. The third heat exchanger (heat pump) 1C2 is connected to the first heat supply system 51 (heat pump). The third heat exchanger 1C1 (natural heat / waste heat) is connected to the piping of one of the second heat supply system 52 (soil hot storage unit), the third heat supply system 53 (soil cold storage unit), the fourth heat supply system 54 (underground aquifer hot storage unit), and the fifth heat supply system 55 (underground aquifer cold storage unit). When the temperature required by the room 71 is determined by the user of the room 71, the control unit 8 compares the temperatures of each heat supply source 4 and automatically changes the combination of heat supply sources 4 sent to the third heat exchanger (1C1·1C2). Although FIG. 2 shows the piping concentrated at the control unit 8, this is for the purpose of explanation; piping switching is performed by electromagnetic switching valves (not shown) provided on each piping, and the piping does not need to be concentrated in one place. Furthermore, the control unit 8 may be located on the web and can be controlled by a smartphone or the like.

[0021] (Used as air conditioning) The third heat exchanger (1C1 / 1C2) can be used for air conditioning. By supplying a hot or cold medium to the third heat exchanger (1C1 / 1C2), the heat medium flowing through the heat medium circuit 13 can be heated or cooled. The third heat exchanger (1C1-1C2) uses the heat recovered when the indoor air is exhausted from the exhaust section 2A to heat or cool the heat medium flowing through the outlet pipe 11. The intake-side heat exchanger 1B uses this heat medium as a heat source to heat or cool the outside air flowing into the room 71 from the intake section 2B.

[0022] Furthermore, the control unit 8 can switch the heat supply sources 4 (42 to 45) of the third heat exchangers (1C1 and 1C2).

[0023] (Selection of natural heat sources and heat pumps) The target temperature of room 71 is sent to control unit 8. Control unit 8 compares the temperature of the heat medium sent from the temperature measurement unit of each heat supply source 4 with the target temperature and determines whether to use the natural heat source or waste heat as is, or whether to use heat pump 9 to further heat or cool the room if it determines that the natural heat source or waste heat is insufficient.

[0024] (When using natural heat sources) When the control unit 8 determines that the heat medium passing through the first heat supply system 51 (other heat source), the second heat supply system 52 (soil heat storage section), the third heat supply system 53 (soil cold storage section), the fourth heat supply system 54 (underground aquifer heat storage section) or the fifth heat supply system 55 (underground aquifer cold storage section), which is a natural heat source or waste heat, is sufficient, the control unit 8 activates the first solenoid valve 6A. The first solenoid valve 6A is biased so as to be normally closed, and opens when a current passes through the solenoid. The control unit 8 sends the heat medium of the selected heat supply system 5 (51 to 55) to the third heat exchanger (1C2).

[0025] As described above, the indoor heat utilization system 1 has a heat medium circuit 13. The heat medium circuit 13 includes a third heat exchanger 1C2 (natural heat / waste heat) between the intake heat exchanger 1B and the exhaust heat exchanger 1A, and the third heat exchanger 1C2 (natural heat / waste heat) uses at least a natural heat source as a heat supply source 4 (42 to 45) to heat or cool the heat medium flowing through the heat medium circuit 13.

[0026] (When using a heat pump) If the control unit 8 determines that it will be difficult or time-consuming to achieve the target temperature with the heat medium of the heat supply system 5 (51-55), the control unit 8 selects a heat supply system 5 (51-55) that can supply a heat medium with a temperature more suitable for achieving the target temperature. The control unit 8 activates the second solenoid valve 6B to send the heat medium of the selected heat supply system 5 to the heat pump 9. The heat pump 9 heats or cools the heat medium selected from the heat supply system 5 and sends it to the third heat exchanger 1C1 (heat pump). Because a heat medium suitable for achieving the target temperature is selected from the heat supply system 5, the energy required for heating or cooling by the heat pump 9 is minimized.

[0027] Instead of the heat pump 9, other heating devices or cooling devices can be used.

[0028] As described above, the indoor heat utilization system 1 of the embodiment can exchange heat between the intake section 2B and the exhaust section 2A, contributing to energy conservation. Moreover, by locating the intake section 2B and the exhaust section 2A at separate locations indoors, it is possible to install a third heat exchanger that primarily uses natural heat sources between them. The present invention contributes to the achievement of the SDGs.

[0029] The above has described in detail the embodiments of the present invention along with examples, but the specific configuration is not limited to these embodiments, and the present invention also includes design changes and the like within the scope of the present invention that do not deviate from the gist of the present invention. Furthermore, the above-described embodiments can be combined by utilizing the techniques of each other, as long as there are no particular contradictions or problems in the purpose, configuration, etc. [Explanation of symbols]

[0030] 1. Indoor heat utilization system 1A Exhaust side heat exchanger 1B Intake side heat exchanger 1C1 Third heat exchanger (heat pump) 1C2 3rd heat exchanger (natural heat / waste heat) 11 Inlet pipe (viewed from the exhaust side) 12 Outlet pipe (viewed from the exhaust side) 13 Heat carrier circuit 2A Exhaust section 2B Intake section 4 Heat source 42 Soil heat storage unit 43 Soil cooling storage unit 44 Underground aquifer heat storage section 45 Underground aquifer cold storage section 5 Heat supply system 51 First heat supply system (other heat source) 52 Second heat supply system (soil heat storage section) 53 Third heat supply system (soil cool storage section) 54 4th heat supply system (underground aquifer heat storage section) 55 5th heat supply system (underground aquifer cold storage section) 6A First solenoid valve 6B Second solenoid valve 7 Building 7A Left wall 7B right wall 71 rooms 8 Control Unit 9. Heat Pump

Claims

1. Equipped with an intake and exhaust section, The intake and exhaust sections are located at separate locations within the room. The intake section is equipped with an intake-side heat exchanger, The exhaust section is equipped with an exhaust-side heat exchanger, The intake heat exchanger and the exhaust heat exchanger are connected by a heat medium circuit. An indoor heat utilization system characterized in that the heat medium circuit sends the heat medium that has been heat exchanged in the exhaust side heat exchanger to the intake side heat exchanger for heat exchange.

2. the heat medium circuit includes a third heat exchanger between the intake side heat exchanger and the exhaust side heat exchanger; 2. The indoor heat utilization system according to claim 1, wherein the third heat exchanger uses at least a natural heat source as a heat supply source to heat or cool the heat medium flowing through the heat medium circuit.

3. 3. The indoor heat utilization system according to claim 2, further comprising a control unit, the control unit being capable of switching the heat supply source of the third heat exchanger.

4. A building equipped with the indoor heat utilization system according to any one of claims 1 to 3.

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