JP3785496B2 - Heat storage system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat storage system that uses an underground aquifer as a heat source and a heat storage tank of an air conditioner and a heat pump from the standpoint of using unused energy and saving energy.
[0002]
[Prior art]
Basic groundwater use method that stores hot water and cold water in the underground aquifer where heat is used between seasons, and uses it in the winter and summer alternately. Thermal storage systems are well known. Compared to the construction of a water heat storage tank on the basement floor of the building, this underground heat storage tank requires little construction cost, enables large-capacity heat storage, and the underground water flow is Darcy. In addition, convection between warm and cold does not occur and mixing loss is small (in the case of a water tank, it is necessary to attach a partition wall or use a temperature stratification effect). In this groundwater utilization system, the groundwater is pumped and the retained heat is used. At that time, a groundwater reduction method is established to provide a pumping well and a reduction well and eliminate the damage of ground subsidence. In winter, the groundwater pumped up from the underground warm water zone is used as a heat source, and the cold water after use is injected into the cold ground water zone. In the summer, the groundwater pumped up from the underground cold water zone is used as a cold heat source. In addition, warm water after use is poured into the underground warm water zone. The temperature of normal natural groundwater is about 15 ° C to 17 ° C. However, due to the heat storage effect, cold water having a temperature lower than that of natural groundwater (for example, 10 ° C) can be pumped from the ground cold water zone in summer. It is highly valuable as a cooling heat source for cooling, etc. On the other hand, warm water (e.g., 20 ° C.) that is considerably hotter than natural ground water can be pumped from the underground warm water zone in the winter season. And is effective as a heat source for air conditioners and heat pumps.
[0003]
The above system is a very reasonable system if the cold source and the hot source are sufficient to cover the amount used throughout the season. However, it is not realistic that the exclusive site can have the capability without interfering with the adjacent land, and in many cases, the heat source is insufficient in the exclusive site due to the enlargement of the building. Therefore, in the conventional system composed of two types of wells, it is effective when the load is small compared to the underground heat capacity, but when the heat load is large compared to the underground heat capacity, the pumping temperature is It is not stable and becomes insufficient as a heat source, or the underground temperature is not stabilized in an annual cycle, and it becomes difficult to use for multiple years.
[0004]
For the above shortage of heat, supplementary treatment will be taken to maintain the system. That is, it is a heat storage operation of a daily cycle. This is to pump the exhaust heat returned to the ground in the daytime using low-cost power at night and heat it back to the original well.
[0005]
[Problems to be solved by the invention]
However, this complementation must treat the exhaust heat during the daytime to the original temperature under a high load, which is not costly and energy-effective.
[0006]
In addition, the above-mentioned pattern of insufficient heat amount is, for example, a heating load in which cooling operation represented by OA load is biased to the cooling load required in winter or a heating load in which cold operation in the cold district is also required in summer. Although it occurs even in a biased building, the same inconvenience occurs when the heat storage operation of the daily cycle is performed for complementation.
[0007]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an underground aquifer that can ensure cost validity even when a heat storage operation of a daily cycle is performed. It is in providing the thermal storage system utilized as a heat source.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a heat storage system that uses the underground aquifer of the present invention as a heat source and a heat storage tank of an air conditioner and a heat pump has an aquifer with an average underground temperature in an arrangement that does not interfere with each other. There are provided three types of wells: a heat source well, a low temperature well having an aquifer lower than the average underground temperature, and a high temperature well having an aquifer higher than the average underground temperature. The cold water pumped from the well is first used as the cold water of the air conditioner, and the return water is reused as the cold heat source on the condensation side of the heat pump to be warmed and then returned to the hot well, or pumped If the water is at the level of cooling water, it is used as a cooling heat source on the condensation side of the heat pump and heated to the hot water well and then returned to the hot water well. In the heating mode, the hot water is pumped from the hot water well and the heat pump is evaporated. Side Return water cooled by the heat source is returned to the heat source well, and the nighttime heat storage mode is pumped from the heat source well and fed to the condenser side and the evaporator side of the heat pump, and from the condenser side. The hot water that comes out is returned to the high temperature well, and the cold water that comes out from the evaporator side is returned to the low temperature well.
[0009]
In the case of buildings that are biased to the cooling load in addition to the above description, the cooling mode in winter daytime is air conditioning the cold water that is pumped from the heat source well and used as the heat source on the evaporation side of the heat pump The return water at the heat source well temperature that is used as the cold heat source of the machine is used as the cold heat source on the condensation side of the heat pump, and the hot water that comes out is returned to the high temperature well and from the high temperature well in the winter night The hot water is pumped, cooled to the temperature of the heat source well through a cooling tower, and returned to the heat source well to recover the heat source well.
[0010]
Also, in the case of buildings that are biased to the heating load, the summer day heating mode comes out after pumping water from the high-temperature well and using it as a heat source on the evaporation side of the air conditioner and circulation heat pump on the condensing side The return water that has reached the temperature of the heat source well is returned to the heat source well, and cold water is pumped from the low temperature well in the summer daytime, warmed to the heat source well temperature through sunlight heat, etc., and returned to the heat source well to recover the heat source well. If you do.
[0011]
[Action]
As a result of configuring three types of wells, it becomes possible to select a well with less load (heat source well) as a pumping well for heat storage when operating in combination with heat storage in a daily cycle and operate at low load. Furthermore, in order to maintain the balance of the three wells, the heat source well at an intermediate temperature is reduced according to the cooling of the building or the heating load (natural groundwater temperature is sufficient for cooling in summer and heating in winter) and reduction. Advantages of a heat storage system that stabilizes the annual cycle of underground temperature and makes use of the underground aquifer as a heat source and heat storage tank for air conditioners and heat pumps by rationally selecting and using wells for recovery It is possible to make more effective use of sex.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0013]
Heat source well 2 having an aquifer with an average underground temperature in an arrangement that does not interfere with each other in site 1, and one of two conventional wells has an aquifer that is lower than the corresponding average underground temperature A low temperature well 3 and a high temperature well 4 having a temperature higher than the corresponding underground temperature are disposed in the other well. Here, the heat source well 2 is imaged at 15 ° C., the low temperature well 3 is imaged at 5 ° C., and the high temperature well 4 is imaged at 25 ° C. However, these temperatures are non-indeterminate values that vary depending on the load conditions. The pumping and reduction in each mode is performed as follows.
[0014]
First, as shown in FIG. 1, the cooling mode that is operated during summer noon pumps the cold water from the low-temperature well 3 and first uses the return water that has been used for the cold water of the air conditioner 5 to reach the temperature level of the heat source well 2. On the evaporation side, it is reused as a cold heat source on the condensation side of the air conditioner 5 ′ and the circulating heat pump 6 to make warm water, and then returned to the high temperature well 4. The cold heat source of the pumped water from the low temperature well 3 is used effectively in a double manner via the heat pump 6 directly by the air conditioners 5, 5 ′. This pattern is acceptable when the pumped water is at the cold water level, and when the pumped water is at a so-called cooling water level that can only be used for a heat pump that has not cooled to the cold water level, it is supplied directly to the heat pump. It becomes.
[0015]
Next, as shown in FIG. 2, the heating mode operated in the winter daytime is used as a heat source on the evaporation side of the heat pump 6, which pumps hot water from the high temperature well 3 and circulates to the air conditioner 5 ′ on the condensing side. The return water that has reached the temperature of the heat source well 2 is returned to the heat source well 2.
[0016]
Furthermore, as shown in FIG. 3, the heat storage mode of the daily cycle operated in summer and winter nights is pumped from the heat source well 2 and supplied to the condenser side and the evaporator side of the heat pump 6, and from the condenser side. The warm water that comes out is returned to the high temperature well 4, and the cold water that comes out from the evaporator side is returned to the low temperature well 3. Energy saving and cost saving are achieved by making full use of the advantage that a well with low load for both low and high temperature heat storage can be selected as a pumping well.
[0017]
In the case of a building biased to a cooling load, as shown in FIG. 4, the hot water is pumped from the high temperature well 4 in the winter night and cooled to the temperature of the heat source well 2 through the cooling tower 7 or the like. It is necessary to recover the heat source well 2 by returning the water.
[0018]
In the case of a building that is biased to the heating load, as shown in FIG. 5, the cold water is pumped from the low temperature well 3 in the summer daytime and heated to the temperature of the heat source well 2 through the sunlight heat 8 or the like. It is necessary to recover the heat source well 2 by returning the water to 2.
[0019]
Regardless of the mode, normal operation of the system is expected by recovering the heat source well 2 having a large burden.
[0020]
FIG. 6 shows a planar arrangement of the wells 2, 3, and 4 that do not interfere with each other, and the arrangement is made with a sufficient spacing. This is possible when the site is large.
[0021]
In contrast to this, FIG. 7 shows a case where the site 1 is constrained, FIG. 7a shows an example in which a three-dimensional arrangement having a level difference from each other is secured with a predetermined interval, and FIG. An example is shown in which the well is partitioned by the packer 9 and configured with a level difference. In this case, the well wall is provided with a screen 10 for each section.
[0022]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0023]
In the conventional method, there are only two wells, a low temperature well and a high temperature well, so it is good for seasonal heat storage, but when combined with daily cycle heat storage, for example, in the summer, pumping from the high temperature well to produce low temperature water Although it is disadvantageous in terms of energy because it is necessary, if three types of wells are configured, the heat source well can be kept at an average temperature and can be selected as a pumping well, so that cold production is energy saving and cost saving (Building a heat exchange system with a constant heat source is advantageous in terms of design).
[0024]
As a result, a combination of daily cycle heat storage becomes possible effectively.
[0025]
Further, even when the load is biased to cooling or heating, the heat source well 2 is restored under energy saving and cost saving, so that there is no problem in maintaining the system.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a cooling mode of a system of the present invention.
FIG. 2 is an explanatory diagram showing a heating mode of the system of the present invention.
FIG. 3 is an explanatory diagram showing a night heat storage mode of the system of the present invention.
FIG. 4 is an explanatory diagram of a recovery mode performed in association with the cooling mode of the system of the present invention.
FIG. 5 is an explanatory diagram of a recovery mode performed in association with the heating mode of the system of the present invention.
FIG. 6 is an explanatory diagram of the arrangement of wells in the system of the present invention.
FIGS. 7A and 7B are explanatory views of the arrangement of wells in the system of the present invention.
FIG. 8 is an explanatory diagram of a conventional heat storage system.
[Explanation of symbols]
1 site 2 heat source well 3 low temperature well 4 high temperature well 5 air conditioner 6 heat pump 7 cooling tower 8 sunlight heat 9 packer 10 screen

Claims (7)

A heat source well having an aquifer having an average underground temperature, a low temperature well having an aquifer having a temperature lower than the average underground temperature, and an aquifer having a temperature higher than the average underground temperature, in an arrangement that does not interfere with each other Three types of wells with high temperature wells are provided, and in the cooling mode, at least the cold water pumped from the low temperature wells is first used as the cold water of the air conditioner, and the return water is reused as the cold heat source on the condensation side of the heat pump In the heating mode, the warm water is pumped from the high temperature well and used as a heat source on the evaporation side of the heat pump, and the return water that has reached the heat source well temperature is returned to the heat source well. In the nighttime heat storage mode, water is pumped from the heat source well and supplied to the condenser side and evaporator side of the heat pump, and the hot water coming out of the condenser side is discharged to the hot well and from the evaporator side. The cold water that comes is returned to the low temperature well respectively. Heat storage system utilizing underground aquifer, characterized in that there was suppose as a heat source and the heat storage tank of the air conditioner and heat pump. A heat source well having an aquifer having an average underground temperature, a low temperature well having an aquifer having a temperature lower than the average underground temperature, and an aquifer having a temperature higher than the average underground temperature, in an arrangement that does not interfere with each other There are three types of wells, a high-temperature well and a cooling mode that uses cooling water pumped from the low-temperature well as a heat source on the condensation side of the heat pump to warm water and then returns to the high-temperature well. The mode is that hot water is pumped from a high-temperature well and the return water cooled by using the heat source on the evaporation side of the heat pump is returned to the heat source well. The night heat storage mode is pumped from the heat source well to heat pump An underground zone characterized in that hot water discharged from the condenser side is returned to the high temperature well and cold water output from the evaporator side is returned to the low temperature well respectively. Heat source for air conditioner and heat pump One thermal storage system that utilizes the thermal storage tank. In addition to the procedure described in claim 1 or 2, the cooling mode in winter daytime uses cold water that is pumped up from the heat source well and used as a heat source on the evaporation side of the heat pump as a cooling source for the air conditioner. The return water that has reached the temperature of the heat source well is used as a cold heat source on the condensation side of the heat pump, and the hot water that comes out is returned to the high temperature well, and hot water is pumped from the high temperature well and cooled in the winter night. The underground aquifer in the case of a building biased to the cooling load, which is cooled to the heat source well temperature and returned to the heat source well through a tower or the like to recover the heat source well, serves as a heat source and heat storage tank for air conditioners and heat pumps. Thermal storage system to use. In addition to the procedure described in claim 1 or 2, the heating mode in the summer daytime is a heat source well temperature that is pumped up from a hot well and used as a heat source on the evaporation side of an air conditioner and a circulating heat pump on the condensing side. When the return water is returned to the heat source well, cold water is pumped from the low temperature well in the summertime, warmed to the heat source well temperature through sunlight heat, etc., and returned to the heat source well to recover the heat source well. A heat storage system that uses the underground aquifer in the case of a building that is biased to a heated heating load as a heat source and heat storage tank for air conditioners and heat pumps. The heat storage system according to claim 1, 2, 3, or 4, wherein the three types of wells arranged so as not to interfere with each other are arranged with a sufficient space in a plane. The heat storage system according to claim 1, 2, 3, or 4, wherein the three types of wells arranged so as not to interfere with each other are arranged with a three-dimensional level difference at a predetermined interval. 5. The heat storage system according to claim 1, wherein the three wells arranged so as not to interfere with each other are configured by partitioning a single well with a packer to ensure a level difference.

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