JP2010038507A - Heat pump utilizing underground heat reserve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute a heat pump system capable of executing underground heat reserve and geothermal utilization to save energy of an air conditioning device and a hot water supply device, as movement of heat quantity of several times to operating energy of the heat pump has limitations, though in a conventional air conditioner (air conditioning device), the heating and cooling is performed by a heat pump while applying the outside air as a heat source to keep a comfortable living room temperature (25 degrees to 28 degrees). <P>SOLUTION: Heat moving efficiency of the heat pump can be improved by reversing the change of the outside air temperature in summer and winter. That is, a problem can be solved by switching the utilization of outside air heat to the underground heat reserve. The heat moving efficiency of the heat pump can be improved by moving heat from high-temperature energy of summer in winter, and moving heat from low-temperature energy of winter in summer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a thermal efficiency improvement method using a heat pump, a heat island prevention method, and equipment.

  The conventional air conditioner configuration is heat transfer by a heat pump based on outside air heat. Outside temperatures are high in summer and low in winter. Since the target room temperature is constant, the room is cooled from high outside air heat in summer. In winter, the room is heated from a low outside temperature. This is transferred by a heat pump using a heat medium gas. Since the gas temperature on the high pressure side is higher than the outside air temperature, the heat of the gas is released to the outside air. Since the temperature on the gas decompression side was lower than that in the room, the low heat of the gas absorbed and cooled the air heat in the room.

The object of the present invention is to improve the heat transfer efficiency of this heat pump. Increasing the heat transfer efficiency increases the heat transfer despite the constant heat pump operating energy. This means a reduction in heat transfer energy.

That is, the air conditioning energy that is the object of the present invention can be saved. For this purpose, the heat source corresponding to outside air heat is changed from outside air to underground heat that is constant throughout the year, the high temperature in summer is stored underground, and is taken out in winter. On the other hand, storing the low temperature in winter in the basement and taking it out in summer solves the purpose.

  In the heat conversion using the gas heat pump function in order to perform indoor air conditioning for the purpose shown in FIG. 1, the underground water is buried in the underground and the underground water is pumped and circulated to 1.5 meters or less below the ground. In the summer, it is a low temperature region in the upper part and the lower part of the annual heat required for seasonal variation is stored underground. It is possible to improve the thermal efficiency of outdoor temperature conversion several times.

In order to enable efficient underground heat storage shown in FIG. 1, a stable underground temperature heat source of about 20 to 25 degrees below a seasonally changing surface layer of about 1.5 meters or less, about every 1000 meters in FIG. It is necessary to use an underground temperature heat source that rises 30 degrees, and to perform heat transfer for heat storage that is effective for soil properties with a slow heat transfer rate.

Since necessary underground well construction is added, it cannot be spread unless construction is simple and inexpensive. The energy for conversion heat storage must be small. In addition, there are additional requirements to prevent adverse effects such as environmental pollution of groundwater due to heat storage and changes in groundwater level.

  From the explanatory diagram of the principle of improving the efficiency of the underground thermal storage air conditioner shown in FIG. 3, the heat pump uses, for example, gas such as Freon, ammonia, and carbon dioxide as the heat medium. There is a characteristic. By operating this circulating compressor, continuous high and low temperature characteristics are created. When heat is released (cooled) at high temperatures, it absorbs heat at low temperatures due to the law of conservation of energy. In other words, heat transfer is possible by using a heat converter that performs heat dissipation and heat absorption. At this time, if the amount of heat radiation is increased, the amount of heat absorption naturally increases. However, due to the gas characteristics of the heat medium, the effective temperature is as low as about 50 to 60 degrees when the low temperature liquefied gas such as economical Freon is used.

On the other hand, the room temperature is not affected by seasonal fluctuations and is required to be constant between 20 degrees and 25 degrees. Therefore, it is assumed that the outdoor temperature is 30 degrees in summer and the temperature difference required for heat conversion is about 10 degrees. Since the gas characteristic is generally 50 degrees at the maximum, the compressed gas body (liquid) temperature is 40 degrees. That is, if the pump capacity (the amount of heat medium gas per fixed time) is made constant, the amount of heat released by about 10 degrees is absorbed. That is, air conditioning in the living room requires cooling in the summer and heating in the winter. Therefore, to obtain the desired heat absorption and heat dissipation, improving the efficiency of heat radiation to the outside improves the heat efficiency.

In the conventional use of outside air heat shown in Fig. 3, the heat dissipation is about 10 degrees, but if the summer stores the cold heat storage in the winter and the summer heat storage in the summer in the basement, heat is dissipated if groundwater is used for circulation with the underground heat storage. The difference in temperature is about 30 degrees, and heat transfer is about three times as much if underground heat storage is used compared to outside temperature using the same heat pump. Furthermore, if deep underground heat shown in FIG. 4 is utilized, efficiency will increase. In other words, energy efficiency can be reduced by reducing the energy of the same necessary heat transfer by increasing the efficiency of the heat pump.

As a result of the present invention, as shown in FIG. 3, the use of underground heat storage is about 1/3 of the air-conditioning energy for the outside air conversion, and energy saving of about 70% is possible. In addition, the use of deep underground temperatures improves winter efficiency. That is, the air-conditioning energy can be reduced to about 1/6, and it has the effect of reducing the amount of carbon dioxide generated for power supply, which is a global problem. In addition, since seasonally changing heat is stored and smoothed underground, it can prevent summer heat island (air heating by air conditioning) and prevent overcooling in winter.

  The combined use of the water heater shown in FIG. 2 enhances the energy saving effect. By using high-temperature heat radiation in the summer for air-conditioning equipment for underground heat storage for hot water supply, no hot water supply energy is required in the summer.

  As shown in FIG. 1, absorption of heat and cold by additional heat absorption from the rooftop and roof by the underground heat storage circulating water in summer and winter improves the heat conversion efficiency.

The individual air conditioning / hot water supply heat pump system uses the configuration shown in FIGS. In general household small-scale commercial facilities, the heat pump compressor employs a low-pressure gas medium. The compressor adopts a single variable inverter rotation control, and connects a plurality of parallel-connected indoor heat absorption / radiation devices and necessary water heaters. Underground thermal storage wells are vertical and have a diameter of 100 to 250 millimeters, a depth of 3 to 10 meters, and are embedded with permeable pipes made of FRP waste material that does not corrode. Two circulating water pipes are installed at the bottom, and an orifice (a small amount of water flows so that water can permeate outside the pipe) is installed in the middle of the well. Use these components to obtain energy-saving air conditioning and hot water supply.

In the underground heat storage method, if the groundwater is not stable (area where the groundwater moves at a high speed), waterproof material is driven around the well (applicable ground area) around the ground and the surrounding area, and the heat storage area is divided into necessary heat. Prevent movement and secure groundwater level. In addition, when using a plurality of wells in a large-scale apartment house, etc., it is possible to more easily and efficiently store local heat by installing a waterproof partition around the well.

  In areas where groundwater contamination may occur, high-pressure gas heat medium can be installed directly in the underground well without circulating the groundwater. It is also possible to bury pipes with exchange fins without installing wells and to convert heat with circulating water or directly with a gas heat medium.

In areas where there is movement of groundwater, the efficiency increases by using a stable underground water heat by burying a permeation pipe horizontally in the basement instead of a vertical well.

For the heat supply circulation water for district heating and cooling with large-scale parallel connection, warm water exceeding 40 degrees below the depth of about 1200 meters can be used in winter. In summer, water from multiple wells in the surface water is good. The circulation is conducted in the deep underground and surface groundwater every season.

Configuration diagram of geothermal energy-saving energy system for air conditioner of the present invention Configuration diagram of geothermal energy-saving system for air conditioner / water heater equipment of the present invention Explanatory diagram of the principle of improving efficiency of underground heat storage air conditioner of the present invention Explanatory diagram of relationship between temperature, depth and application of deep underground heat utilization

Explanation of symbols

(1) Water pump (2) Outdoor air conditioner unit (3) Heat exchanger (4) Compressor (5) Gas tank (6) Solenoid valve (7) Refrigerant gas pipe (8) Rooftop / roof watering (9) High temperature heat storage in summer (10) Permeable pipe (11) Surface layer pipe (12) Deep layer pipe (13) Solenoid valve (14) Refrigerant gas pipe (15) Gas tank (16) Compressor (17) Heat exchanger (18) Outdoor air conditioner unit (19) Hot water supply (20) Water supply (21) Warm water tank (22) Water pump (23) Surface layer pipe (24) Part A underground (25) Permeable pipe (26) Deep layer pipe

Claims (8)

  In air-conditioning equipment, refrigerators, and hot water supply equipment using heat pumps, use equipment that uses groundwater as a heat medium in addition to outside air individually or in parallel, and circulates groundwater with a water pump to convert underground heat storage. Gas heat pump device that improves heat conversion efficiency and prevents heat island environment temperature rise.   In the well structure necessary for underground heat storage of the apparatus of claim 1, when using a pit well, the well pipe has a large number of holes through which water can flow, and when a single well is used, the high temperature heat conversion water is radiated to the upper part to cool A heat storage well structure with a plurality of circulating water pipes with different lengths in order to dissipate the converted water in the lower part and to reversely connect it when absorbing heat.   The well structure required for underground heat storage of the apparatus according to claim 1, wherein the circulating pump water refrigerant connected to the heat converter of one or more gas compressors that require external heat conversion can flow into the underground heat storage well pipe Using a tube with a large number of holes or a tube without a hole having the surface area required for heat conversion, each individual tube is divided into a plurality of vertical wells to be used separately for high temperature and low temperature, or in parallel in the horizontal and horizontal directions. Thermal storage well structure for improving underground heat storage efficiency by arranging well pipes underground or arranging them in a continuous spiral to specify the flow direction of high and low temperature water.   In air-conditioning equipment, refrigerators, and hot water supply equipment using heat pumps, individual external heat conversion equipment for compressors connected to one or more indoor heat converters can have a number of holes through which individual high-pressure gas can be passed through individual underground wells. A structure in which heat medium gas is circulated underground for the purpose of storing heat by converting it into groundwater in a well pipe, which improves heat conversion efficiency and prevents heat island outside air temperature rise.   5. The underground heat storage efficiency improvement measure as claimed in claim 4, wherein the endothermic conversion water in the summer is pumped for the purpose of heating and cooling the circulating water in order to increase the heat radiation temperature in the winter and conversely to use the cold in the winter in the summer. Water is sprinkled on the outdoor rooftop or roof, and heated water is injected into the basement and cooling water is injected from the bottom to store heat.   In a structure that heats and heats required hot water such as shower water, the water in the water heater is heated before heat conversion with underground heat storage circulating water during indoor cooling (summer), and the heat pump has extra power in the winter and at night. A method of heating the water heater sometimes.   In the structure of a thermal storage well, there is no hole with a hole with a hole that can pass through the groundwater layer as a heat storage basement with a depth of about 1.5 meters below the ground, where the underground temperature characteristic is the average annual temperature of the ground temperature Heat storage tube placement method using heat exchangeable tubes.   In the structure of a thermal storage well, the heat pump system using underground heat is characterized in that the conversion water in winter is obtained from a deep underground at 25 degrees or more, and the conversion water in summer is obtained from a shallow underground below 1.5 meters underground. .

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