Water heat source heat pump system

Abstract

To provide a water heat source heat pump system which can be installed and operated even in a district that does not have sufficient underground water, and in which the risk caused by utilizing the underground water is small.SOLUTION: A water heat source heat pump system includes: a water storage tank; a well; a water heat source HP in which the heat source is water supplied from the water storage tank / the well; a water supply flow passage arranged between the water storage tank / well and the water heat source HP, and for supplying water to the water heat source HP; and a water return flow passage for supplying the water discharged from the water heat source HP to the water storage tank / well. In the case where the temperature of the water supplied from the water storage tank is higher than a predetermined temperature, the water supply flow passage supplies the water of the water storage tank with respect to the water heat source HP, and in the case where the temperature is lower than the predetermined temperature, it supplies the water of the well with respect to the water heat source HP. The water heat source HP absorbs heat from the water supplied from the water storage tank / well, discharges the water after the heat absorption to the water return flow passage, and the water return flow passage returns the water after heat absorption to the water storage tank / well which is the supply source.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This relates to the technology of water source heat pump systems. [Background technology]

[0002] The water source heat pump (hereafter referred to as "HP") is characterized by the fact that it uses heat from groundwater, river water, etc., and by using water, which has a constant temperature both in summer and winter, as a heat source, it can achieve highly efficient and stable cooling and heating operation. Summary of the Invention [Problem to be solved by the invention]

[0003] However, conventionally, water heat source HPs that use groundwater as described above have had the problem that they can only be installed and operated in areas where groundwater is abundant.

[0004] In addition, conventional water-based heat source HPs that use groundwater have the problem that they require pumping up large amounts of groundwater, which could lead to serious problems such as land subsidence.

[0005] In view of the above problems, the present invention aims to provide a water-source heat pump system that utilizes groundwater, but which can be installed and operated even in areas where groundwater is not abundant, and which has low risks associated with using groundwater. [Means for solving the problem]

[0006] One embodiment of the disclosed water source heat pump system is a water source heat pump system including a water tank for storing heated water, a well for pumping and returning water, a water source heat pump using water supplied from the water tank or the well as a heat source, and water flow paths arranged between the water tank and the water source heat pump and between the well and the water source heat pump, wherein the water flow path includes a water supply flow path for supplying water to the water source heat pump, and a water return flow path for supplying water discharged from the water source heat pump to the water tank or the well. The water supply flow path supplies water from the water storage tank to the water source heat pump when the temperature of the water supplied from the water storage tank is higher than a predetermined temperature, and supplies water from the well to the water source heat pump when the temperature of the water supplied from the water storage tank is lower than the predetermined temperature, the water source heat pump absorbs heat from the water supplied from the water storage tank or the well via the water supply flow path and discharges the water after absorbing heat to the water reduction flow path, and the water reduction flow path returns the water after absorbing heat to the water storage tank or the well, which is the source of the water after absorbing heat. Effect of the Invention

[0007] The disclosed water source heat pump system utilizes groundwater, which not only makes it possible to install and operate the system in areas where groundwater is not abundant, but also reduces the risks associated with using groundwater. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram illustrating the configuration of a water heat source heat pump system according to an embodiment of the present invention. [Diagram 2] 4 is a flowchart showing the flow of an example of processing by the water-source heat pump system according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to the drawings, an embodiment of the present invention will be described. (Operation principle of the water source heat pump system according to this embodiment)

[0010] The operating principle of a water-source heat pump system (hereinafter simply referred to as "the system") 100 according to this embodiment will be described with reference to Fig. 1. Fig. 1 is an overall view of the system 100.

[0011] As shown in FIG. 1, the system 100 includes a water tank 110, a well 120, a water-source heat pump (hereinafter referred to as “water-source HP”) 150, a water flow path 160, a mixing valve 190, and a carbon dioxide generator 200.

[0012] Water storage tank 110 is a heat storage tank that stores heated water supplied from carbon dioxide generation device 200. Water storage tank 110 receives heated water sent from carbon dioxide generation device 200 in an upper layer, and supplies relatively low-temperature water to carbon dioxide generation device 200 from a lower layer.

[0013] The water in the upper layer of the water storage tank 110, which is relatively hot, is also supplied to the water heat source HP 150 via the water flow path 160 and the mixing valve 190. The water discharged from the water heat source HP 150, which has absorbed heat (or released heat, if we consider the water as the main component), is supplied to the lower layer of the water storage tank 110 via the water flow path 160. Relatively high temperature water is stored in the upper layer of the water tank 110, and relatively low temperature water is stored in the lower layer of the water tank 110.

[0014] The well 120 is composed of a water extraction well 130 that draws up water from underground and a reinjection well 140 that returns water underground. The water extraction well 130 and the reinjection well 140 may be the same well. The water drawn up from the water extraction well 130 is supplied to the water heat source HP 150 via a water flow path 160 and a mixing valve 190. The water discharged by the water heat source HP 150 and having a relatively low temperature after absorbing heat (after releasing heat) is supplied to the reinjection well 140 via the water flow path 160.

[0015] The water heat source HP (heat exchanger) 150 absorbs heat from water supplied from the water storage tank 110 or the well 120 via a water flow path 160 and a mixing valve 190. In addition, the water heat source HP 150 returns the water after absorbing heat (after releasing heat) via the water flow path 160 to the water storage tank 110 or the well 120, which is the supply source of the water. The water heat source HP150 performs heating and cooling operations, but the heating and cooling operations using the water heat source HP150 utilize general technology.

[0016] The water flow path 160 is composed of a water supply flow path 170 that supplies water to the water heat source HP150 via a mixing valve 190, and a water return flow path 180 that returns the water discharged from the water heat source HP150 to its supply source, the water storage tank 110 or the well 120. The water return flow path 180 also plays a role in sending the water discharged from the water heat source HP150 to the mixing valve 190 so that it can be reintroduced into the water heat source HP150.

[0017] The water flow path 160 (water supply flow path 170) circulates (supplies) water from the water storage tank 110 when the temperature of the water supplied from the water storage tank 110 to the water heat source HP 150 is higher than a predetermined temperature. On the other hand, the water flow path 160 (water supply flow path 170) circulates (supplies) water from the well 120 (water collection well 130) when the temperature of the water supplied from the water storage tank 110 to the water heat source HP 150 is lower than a predetermined temperature.

[0018] By carrying out the above-mentioned control, the amount of water (groundwater) from well 120 used by water heat source HP150 can be reduced, making it possible to utilize water heat source HP150 even in areas where groundwater is not abundant. When heat can be stored in water storage tank 110, groundwater is not consumed just to operate water heat source HP150. In addition, the adverse effects and concerns caused by pumping groundwater can be reduced.

[0019] The mixing valve 190 is a device that automatically mixes water (high temperature water) supplied from the water storage tank 110 or well 120 (water extraction well 130) via the water flow path 160 (water supply flow path 170) with water (return water, low temperature water) discharged from the water heat source HP 150 in a ratio that results in the set water temperature.

[0020] The mixing valve 190 is disposed between the water supply flow path 170 and the water heat source HP 150, and between the water reduction flow path 180 and the water heat source HP 150, and adjusts water supplied from the water storage tank 110 or the well 120 (water extraction well 130) to a specified set temperature and flows it into the water heat source HP 150. The mixing valve 190 is disposed at a position where the water supply flow path 170, the water reduction flow path 180, and the water heat source HP 150 are connected (a position that connects these three elements).

[0021] Under certain conditions, the mixing valve 190 may stop accepting water supplied from the water supply flow path 170 and supply only water supplied from the water reduction flow path 180 (water discharged from the water heat source HP 150 after absorbing heat (after discharging heat)) to the water heat source HP 150. Here, "under certain conditions" refers to a case where the water supplied from the water supply flow path 170 (water supplied from the water storage tank 110 or well 120) is too hot or too cold, so that even when mixed with the water discharged from the water heat source HP 150, the water cannot be made to flow to the water heat source HP 150 at the specified set temperature.

[0022] In addition, water discharged from the water heat source HP150 and not re-supplied (used) to the water heat source HP150 by the mixing valve 190 flows through the water reduction passage 180 and is returned to its source, the water storage tank 110 or the well 120 (reinjection well 140).

[0023] Carbon dioxide generator 200 generates carbon dioxide and heat by burning fossil fuels, and supplies the generated carbon dioxide into vinyl greenhouse 210 to promote the growth of agricultural crops, while discharging water heated by the generated heat. The purpose of carbon dioxide generator 200 is to promote the growth of agricultural crops, but from the viewpoint of only its operating principle, carbon dioxide generator 200 is a so-called water heater.

[0024] The water heated by the carbon dioxide generator 200 is supplied to the water tank 110 (upper part), and the relatively cool water in the lower part of the water tank 110 is supplied to the carbon dioxide generator 200 to transfer the heat generated by the carbon dioxide generator 200.

[0025] Based on the above operating principle, the present system 100 utilizes a heat pump that uses groundwater, which not only enables installation and operation in areas where groundwater is not abundant, but also reduces the risks associated with using groundwater.

[0026] In addition, this system 100 effectively utilizes the exhaust heat from a carbon dioxide generator that is operated to promote the growth of agricultural crops, thereby reducing the amount of fuel such as heavy oil used for heating and cooling, and also reducing the CO2 generated by heating and cooling operation. (Example of processing by the water source heat pump system according to this embodiment) The flow of an example of processing by the present system 100 will be described with reference to Fig. 2. Fig. 2 is a flowchart showing the flow of an example of processing by the present system 100.

[0027] At S10, the carbon dioxide generation device 200 generates carbon dioxide and heat by burning fossil fuel, and supplies the generated carbon dioxide into the vinyl greenhouse 210 to promote the growth of agricultural crops, while discharging water heated by the generated heat.

[0028] In S20, the carbon dioxide generation device 200 supplies heated water to (the upper part of) the water storage tank 110. Also, in S20, the carbon dioxide generation device 200 obtains relatively low-temperature water in the lower part of the water storage tank 110 in order to transfer the heat generated by the carbon dioxide generation device 200.

[0029] When the temperature of the water supplied from the water storage tank 110 to the water heat source HP 150 is higher than a predetermined temperature in S30 (YES in S30), the process proceeds to S40. In another embodiment, when the temperature of the water stored in the upper portion of the water storage tank 110 is higher than a predetermined temperature (YES in S30), the process proceeds to S40.

[0030] On the other hand, when the temperature of the water supplied from the water storage tank 110 to the water heat source HP 150 is lower than the predetermined temperature in S30 (NO in S30), the process proceeds to S100. In another embodiment, when the temperature of the water stored in the upper portion of the water storage tank 110 is lower than the predetermined temperature (NO in S30), the process proceeds to S100. In S40, the water flow path 160 (water supply flow path 170) circulates (supplies) only the water from the water storage tank 110 toward the water heat source HP150.

[0031] In S50, the mixing valve 190 automatically mixes the water (high temperature water) supplied from the water storage tank 110 via the water flow path 160 (water supply flow path 170) with the water (return water, low temperature water) discharged from the water heat source HP150 in a ratio that results in the set water temperature.

[0032] In S60, the mixing valve 190 causes the water supplied from the water storage tank 110, which has been adjusted to a predetermined set temperature, and the water discharged from the water heat source HP150, to flow toward the water heat source HP150.

[0033] In S70, water heat source HP (heat exchanger) 150 absorbs heat from the water supplied in S60. Then, water heat source HP 150 returns the water after absorbing heat (after releasing heat) to the water storage tank 110, which is its supply source, via water return flow path 180. Note that water heat source HP 150 performs heating and cooling operations using the heat of the water supplied in S60, and the heating and cooling operations by water heat source HP 150 utilize general technology.

[0034] In S70, the water reduction flow path 160 returns the water discharged from the water heat source HP150 to its supply source, the water storage tank 110. The water reduction flow path 160 also sends the water discharged from the water heat source HP150 to the mixing valve 190 so that it can be reintroduced into the water heat source HP150.

[0035] If not all of the water discharged from the water heat source HP150 in S80 is reintroduced into the water heat source HP150 (YES in S80), the water reduction passage 160 in S90 returns the water discharged from the heat source HP150 that was not reintroduced into the water heat source HP150 to the water storage tank 110, which is its supply source. In S100, the water flow path 160 (water supply flow path 170) circulates (supplies) only the water from the water collection well 130 toward the water heat source HP150.

[0036] At S110, the mixing valve 190 automatically mixes the water (high temperature water) supplied from the water extraction well 130 via the water flow path 160 (water supply flow path 170) with the water (return water, low temperature water) discharged from the water heat source HP150 in a ratio that results in the set water temperature.

[0037] In S120, the mixing valve 190 allows the water supplied from the water collection well 130, which has been adjusted to a predetermined set temperature, and the water discharged from the water heat source HP150, to flow toward the water heat source HP150.

[0038] In S130, water heat source HP (heat exchanger) 150 absorbs heat from the water supplied in S120. Then, water heat source HP 150 returns the water after absorbing heat (after releasing heat) to its supply source, water extraction well 130, via water return flow path 180. Note that water heat source HP 150 performs heating and cooling operations using the heat of the water supplied in S120, and the heating and cooling operations by water heat source HP 150 utilize general technology.

[0039] In S130, the water return flow path 160 returns the water discharged from the water heat source HP150 to its supply source, the water extraction well 130. The water return flow path 160 also sends the water discharged from the water heat source HP150 to the mixing valve 190 so that it can be reintroduced into the water heat source HP150.

[0040] If not all of the water discharged from the hydrothermal heat source HP150 in S140 is reinjected into the hydrothermal heat source HP150 (YES in S140), the water reduction passage 160 in S150 returns the water discharged from the heat source HP150 that was not reinjected into the hydrothermal heat source HP150 to the reduction well 140 from which it was supplied.

[0041] By carrying out the above-described processing, the present system 100 utilizes a heat pump that uses groundwater, which not only enables installation and operation in areas where groundwater is not abundant, but also reduces the risks associated with using groundwater.

[0042] In addition, this system 100 effectively utilizes the exhaust heat from a carbon dioxide generator that is operated to promote the growth of agricultural crops, thereby reducing the amount of fuel such as heavy oil used for heating and cooling, and also reducing the CO2 generated by heating and cooling operation.

[0043] Although the embodiment of the present invention has been described in detail above, the present invention is not limited to such specific embodiment, and various modifications and variations are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0044] 100 Water source heat pump system 110 Water Tank 120 Well 130 Water collection well 140 Reinjection well 150 Water source heat pump (heat exchanger) 160 Water channel 170 Water supply channel 180 Water reduction channel 190 Mixing valve 200 Carbon Dioxide Generator 210 Vinyl House

Claims

1. A water source heat pump system comprising: a water tank for storing heated water; a well for pumping and returning water; a water source heat pump using water supplied from the water tank or the well as a heat source; and a water flow path disposed between the water tank and the water source heat pump and between the well and the water source heat pump, The water flow path includes a water supply flow path that supplies water to the water source heat pump, and a water return flow path that supplies water discharged from the water source heat pump to the water storage tank or the well, the water supply flow path supplies water from the water storage tank to the water-source heat pump when the temperature of the water supplied from the water storage tank is higher than a predetermined temperature, and supplies water from the well to the water-source heat pump when the temperature of the water supplied from the water storage tank is lower than the predetermined temperature; The water heat source heat pump absorbs heat from water supplied from the water storage tank or the well through the water supply flow path, and discharges the water after absorbing heat into the water reduction flow path; A water-source heat pump system, characterized in that the water reduction flow path returns the water after heat absorption to the water tank or the well, which is the source of the water after heat absorption.

2. The water source heat pump system according to claim 1, further comprising a mixing valve that mixes the water supplied from the water supply flow path and the water reduction flow path to a predetermined set temperature and supplies the water to the water source heat pump.

3. The water source heat pump system described in claim 2, characterized in that, under specified conditions, the mixing valve stops accepting water supplied from the water supply flow path and supplies only water supplied from the water reduction flow path to the water source heat pump.

4. The water source heat pump system according to claim 2, characterized in that the water after heat absorption that is not used in the mixing valve is returned to the water storage tank or the well, which is the source of the water.

5. The present invention is provided with a carbon dioxide generating device that generates carbon dioxide and heat by burning fossil fuels, supplies the generated carbon dioxide into a vinyl greenhouse to promote the growth of agricultural crops, and discharges water heated by the generated heat; 5. A water source heat pump system as described in any one of claims 1 to 4, characterized in that the water storage tank is a tank for storing the heated water discharged by the carbon dioxide generating device, and the warmed water is the heated water discharged by the carbon dioxide generating device.

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