JP2007127397A - Geothermal heat utilization system of house in cold area - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for achieving a comfortable dwelling environment temperature by using a base slab for a heat accumulation layer, by directly collecting geothermal heat to accumulate it, and compensating shortage of the amount of accumulated heat by a hot-water heating heat source machine in order to solve high cost of excavation such as boring, high heat exchange facility cost, shortage of heat quantity due to low underground temperature in the winter period all of which make geothermal heat utilization of a house in a cold area difficult. <P>SOLUTION: A base slab is used for a heat accumulation layer, the heat accumulation layer and a building are integrally heat-insulated from the outside air and an underground surface layer part, and the geothermal heat is efficiently collected and accumulated without executing large-scale excavation. This system is characterized in that a hot water circuit is arranged in the heat accumulation layer for compensating the low underground temperature in a cold area, heat accumulation is assisted by a heat source machine, and a radiator and a duct for equalizing the temperature in the building are installed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

Detailed Description of the Invention

  The present invention relates to a technology for efficiently storing ground heat directly in a well-insulated soil concrete or foundation slab concrete and using it for air conditioning in a house, and a hot water heating heat source for making up for the shortage of heat storage in cold regions. In addition, the present invention relates to an air conditioning system that provides a comfortable living temperature in a house by adding piping and a radiator thereof.

In conventional geothermal houses, in order to raise geothermal heat from underground, excavation of pits or underground piles or buried pipes are carried out, and heat medium circulation pipes are installed in it and collected by a heat exchanger. It heats up. * (For example, see Patent Documents 1 and 2)
Similarly, there are some which excavate pits or install underground piles or buried pipes and ventilate them to collect heat. * (For example, see Patent Document 3)
If excavation, pile driving, burial, etc. are not performed, heat storage in the concrete slab depends only on underground heat. * (For example, see Patent Document 4)
*

Patent Publication 2003-343844 Patent Publication 2005-300120 Patent Publication 2003-035456 Patent Publication 2005-241041

Problems to be solved by the invention

This has the following drawbacks.
(A) A large amount of money is required when excavating pits, driving underground piles, or installing buried pipes.
(I) Among the above (A), when burying, the ground should be softened by backfilling soil. Or a large amount of money is required for soil improvement, ground reinforcement, etc. as a countermeasure against becoming weak.
(C) The installation of equipment such as heat pumps requires a large amount of money.
(D) It is difficult to maintain and manage underground facilities.
(E) When the underground heat is directly stored in the soil concrete or foundation slab without excavating the vertical hole, driving the underground pile, or installing the buried pipe, the underground temperature is obtained only by the direct conduction heat of the underground heat. In a cold region where heat is low, the amount of heat is insufficient and the comfortable temperature cannot be reached.
(F) In the conventional foundation heat insulation method, heat loss due to the ground surface in contact with the outer periphery of the foundation is large, and the underground heat cannot be efficiently conducted to the heat storage plate.
(G) When using auxiliary heating separately, the utilization efficiency of geothermal heat is reduced.
The present invention has been conceived to eliminate the above drawbacks.

Means for solving the problem

Originally, geothermal heat tends to reach equilibrium and distribute evenly in continuous underground soil, regardless of depth, but in winter, the surface layer temperature is abrupt compared to about 3 meters deep or below. To drop. This is a result of heat dissipation from the ground surface, and if there is a building or insulation that is well insulated against the outside air on the ground surface, heat dissipation does not occur and the ground heat is not pumped up from deep underground. Can be directly collected at the base of the building, eliminating the need for costly excavation, pile driving, burial, and heat exchange devices. In addition, in geothermal heating in cold areas north of the Tohoku region, since the underground temperature is lower than in the west of the Kanto region, there is a shortage of heat during the winter period. Therefore, the technical means for solving the problems are as follows.
(A) By installing a soil concrete board or concrete slab at the base of the building, it directly receives the underground heat and forms a heat storage layer.
(B) In order to reduce heat loss during the conduction of underground heat to the heat storage layer, sufficient heat insulation is performed on the foundation, and a horizontal heat insulation plate on the outside of the foundation to prevent heat dissipation to the adjacent ground surface. Make sure that the installation is complete. Moreover, in order to maximize the heat receiving area of geothermal heat, no heat insulating material is installed on the lower surface of the heat storage layer, including the outer periphery of the foundation.
(C) The hot water generated by the hot water heating heat source in the heat storage layer is circulated by piping to compensate for the lack of heat storage during the winter period in cold regions, and the circulating hot water is led to the low temperature part of the building through the piping to dissipate heat. The temperature inside the building will be equalized with a vessel.
(D) Enough airtightness and heat insulation in the building so that the temperature of the heat storage layer and the temperature in the building are in equilibrium, and the air in the building is circulated by ducts and duct fans.
(E) During the summer period, the hot water heating heat source machine is stopped and the circulating water is operated between the heat storage layer and the radiator to obtain the cooling effect, and at the same time, the air in the building is circulated by the duct and duct fan. Try to equalize temperature.
The present invention is a geothermal heat utilization system for a house in a cold area using the above means.

Hereinafter, embodiments of the present invention will be described.
(A) Residential foundations shall be externally insulated to minimize heat dissipation from the foundation concrete to the surface layer in contact with the outside air and the ground surface. Insulation plates will also be installed horizontally outside the foundation to minimize the dissipation of geothermal heat from the surface.
(B) Install solid soil concrete on a solid foundation or cloth foundation to form a heat storage layer.
(C) The building above the heat storage layer shall be sufficiently airtight and insulated against the outside air.
(D) Hot water piping is provided in the heat storage layer, and hot water is circulated by the hot water heating heat source machine to compensate for the shortage of heat storage.
(E) The circulating hot water of (d) above is guided to the necessary place in the building by piping, and the temperature inside the building is equalized using a radiator.
(F) A duct is provided between the upper part of the building and the heat storage layer, and the air in the building is circulated by a fan so that the temperature in the building becomes uniform.
The present invention has a structure as described above, and when using this, the operation of the heat source machine is stopped in the summer high temperature period, and the circulating water between the heat storage layer and the radiator at the necessary place in the building is operated, Also, during the low temperature period in winter, the heat source machine is operated according to the set temperature, and the circulating hot water between the heat storage layer and the radiator at the necessary place in the building is operated. Further, the rotation of the duct fan is controlled or reversed according to the setting of the room temperature so that the temperature in the building becomes uniform.

The invention's effect

(A) The use of geothermal heat can increase the temperature of the heat storage layer and can reduce the fuel consumption of the air conditioning equipment.
(B) Since excavation, pile driving and burial for collecting heat in the ground are not involved, construction costs can be reduced, and the structure for using geothermal heat is greatly simplified and maintenance costs are reduced. In addition, the existing ground is not weakened.
(C) Since a heat exchanger such as a heat pump is not used, the equipment cost can be reduced.
(D) Insufficiency of heat storage due to underground heat in cold regions can be avoided by using a hot water heating heat source. This is not only an auxiliary heat for heat storage, but also maintains the soil temperature under the heat storage layer that falls from summer to winter and forms a large heat storage layer that is integrated with the concrete heat storage layer. is there.
(E) The temperature of the building can be made uniform at low temperatures in winter by guiding the circulating hot water in the heat storage layer to the necessary part of the building by piping and generating warm air by a radiator.
(F) It is possible to provide a cooling facility that uses the underground heat by guiding the circulating water inside the heat storage layer to a necessary part in the building by piping at a high temperature in summer and generating cold air by a radiator.
(G) By devising the basic heat insulation method, underground heat of 3 m or deeper can be efficiently guided to the heat storage layer at the base of the building.
The present invention can produce the above effects.

  It is structural sectional drawing of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water heating heat source machine with built-in pump 2 Radiator 3 Thermal storage layer 4 Thermal insulation board outside foundation 5 Horizontal thermal insulation board outside foundation 6 Airtight and thermal insulation layer of building 7 Duct 8 Duct fan

Claims (1)

  In a residential building that is sufficiently insulated against the outside air, the foundation concrete board that is equipped with a horizontal heat insulating plate on the outer periphery of the foundation is used as a heat collecting plate for underground heat and a heat storage layer for underground heat and hot water heating heat. A system that uses cooling and heating equipment by operating circulating water between the piping inside the heat storage layer and the radiator installed in the building using the pump of the heat source machine.

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