JP2000205611A - Heat storage radiation cooler/heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cooler/heater for storing cold heat or hot heat into a heat storage material in a heat storage tank using inexpensive night power and radiating heat from the front face of the heat storage tank in which vertical temperature difference can be eliminated by providing means for blowing air into the heat storage tank during heating operation thereby keeping an appropriate humidity. SOLUTION: In a heat storage tank 1 filled with a heat storage material, i.e., water, a heat transfer coil 6 coupled with the outdoor unit 5 of a heat pump is laid in order to heat up the water with heat generated through condensation of refrigerant in the heat transfer coil 6 during heating operation and to freeze the water by absorbing heat through evaporation of refrigerant during cooling operation. A room is cooled/ heated by transferring heat through radiation from the heat radiating plane 2 on the front of the heat storage tank 1 and through convection. An air compressor 10 is mounted on a cover 13 provided at the upper end of the heat storage tank 1. During heating operation, compressed air is blown from the compressor 10 into the lower part of hot water through an air supply pipe 11 extending downward into the heat storage tank 1 to generate bubbles. Consequently, convection of hot water takes place in the heat storage tank 1 and vertical temperature difference is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative radiant cooling and heating apparatus, and more particularly, to storing cold or warm heat in a heat storage material in a heat storage tank using inexpensive electric power at night, and using the front surface of the heat storage tank as a heat radiation surface. The present invention relates to an air blowing means and a stirring means for a heat storage material of a home regenerative radiation cooling / heating apparatus for performing cooling and heating by radiation.

[0002]

2. Description of the Related Art Conventionally, an ice heat storage device for making ice at night using inexpensive nighttime electric power and performing air conditioning while melting ice in the daytime has been widely used in large-scale devices such as buildings or factories. There are only a small number of proposed regenerative air-conditioning units for home use in small-scale spaces, and they have not yet reached practical use. Japanese Patent Application Laid-Open No. 9-210415 discloses a regenerative radiant cooling and heating device as an example of a regenerative cooling and heating device for home use. FIG. 2 is a cross-sectional view showing the structure of a conventional regenerative radiation cooling and heating apparatus. In this example, the heat storage tank 1 is installed in a room, a heat storage material is held in the heat storage tank 1, and a known heat pump type outdoor unit 5 is driven by night power,
Cold or warm heat is stored in the heat storage tank 1 via the heat transfer coil 6, and cooling and heating are performed in the daytime by the stored cold or warm heat. A heat insulating material 7 is provided on the back surface and the lower surface.

[0003] Cooling or warming heat is radiated into the room by natural convection heat transfer and radiant heat transfer using the front surface or the front and side surfaces of the heat storage tank as the heat radiating surface 2, and there is no air flow by the fan, so that it is comfortable. If water is used as the heat storage material, it will become ice during cooling, so the heat radiation surface will be close to 0 ° C, and indoor dehumidification will be carried out to reduce the humidity, making it comfortable even if the indoor temperature is high. . When cooling and heating are not performed, the heat insulating cover 3 is closed to limit heat radiation, and when cooling and heating is required, the heat insulating cover 3 is rolled up by the winding portion 4 to open the heat insulating cover 3 and radiate / absorb heat from the heat radiating surface 2.

[0004]

In the above-mentioned conventional example, indoor air is low in humidity because of condensation on the heat radiation surface during cooling, but it is comfortable to decrease in humidity due to an increase in temperature during heating. However, there was a problem that a humidifier was required separately. Water, which is a normal heat storage material in the heat storage tank, is stored as warm water during heating, but the warm water has a high temperature at the upper part and a low temperature at the lower part. Therefore, there is also a problem that the temperature of the indoor air is high near the ceiling and low at the bottom near the floor. SUMMARY OF THE INVENTION It is an object of the present invention to provide a regenerative radiant cooling and heating apparatus which solves the above-mentioned problems of the conventional art, maintains an appropriate humidity at the time of heating, and can eliminate a vertical difference in temperature.

[0005]

SUMMARY OF THE INVENTION The present invention is characterized in that a regenerative radiant cooling / heating apparatus has means for blowing air into a heat storage tank during heating. Another feature is that it has means for stirring the heat storage material. According to the present invention, air is blown into warm water in a heat storage tank at the time of heating, and the air is discharged into the room, whereby high-temperature, 100% humidity air can be supplied to the room. Thereby, the indoor air can be humidified, so that a separate humidifier is not required. Furthermore, the convection is generated in the hot water in the heat storage tank due to the rise of the blown bubbles, and the hot water in the heat storage tank is agitated, so that the vertical temperature difference of the hot water is reduced, and the vertical temperature difference of the room temperature is reduced.

[0006] Conventional humidifiers have been miniaturized by ultrasonic waves, but they have not been used recently because minerals contained in the water are deposited and cause failure of electric equipment. Power consumption is large because water is evaporated by the heater. As in the present invention, humidifying a room with steam from hot water heated by a heat pump capable of effectively using electric power reduces energy consumption.

[0007] In addition, although the water does not contribute to the humidification of the room, it is possible to reduce the vertical temperature difference of the indoor air by stirring the water as a heat storage material to reduce the vertical temperature difference. As a means for stirring water, a method in which a pipe at the suction port reaches the lower part of the heat storage tank by pumping low-temperature water at the lower part of the heat storage tank and supplying it to the upper part of the heat storage tank, or a method of pumping high-temperature water at the upper part of the heat storage tank A method of supplying the heat to the lower part of the heat storage tank through a pipe at the discharge port is used.

[0008]

Embodiments of the present invention will be described below in detail. FIG. 1 is a cross-sectional view showing a structure of a regenerative radiation cooling / heating apparatus to which the present invention is applied. Heat storage tank 1 is 2m high,
Stainless steel with a width of 80 cm and a depth of 10 cm, has water as a heat storage material inside, and a diameter connected to the outdoor unit 5 of the heat pump
A 9 mm copper heat transfer coil 6 is laid. During heating, water of the heat storage material becomes hot water due to heat generated by condensation of the refrigerant in the heat transfer coil 6, and during cooling, ice is formed around the heat transfer coil 6 due to heat absorption due to evaporation of the refrigerant. The front surface of the heat storage tank 1 serves as a heat radiating surface 2. During cooling and heating, the room is cooled and heated by radiant heat transfer from the heat radiating surface 2 and natural convection heat transfer. The heat radiating surface 2 has a heat insulating cover 3 made of two cloths.
Is closed to cover the heat radiating surface 2, but at the time of heat radiating, the heat insulating cover 3 is opened to radiate heat.

At the upper end of the heat storage tank 1, there is a lid 13 of the heat storage tank 1. A small air compressor 10 is provided on the lid 13, and an air supply pipe 11 having an inner diameter of 13 mm extends from an outlet of the compressor 10 to a lower portion of water as a heat storage material to constitute an air blowing means. That is, at the time of heating, indoor air is taken in from the inlet of the compressor 10 and blown into the lower portion of the hot water through the air supply pipe 11 to generate bubbles. The air bubbles are warmed by hot water, become 100% in humidity, and are blown into the room through small holes (not shown) provided in the lid 13 above the heat storage tank. The air blowing rate may be, for example, about 300 liters per hour.

When air is not blown, the temperature of the hot water in the upper part of the heat storage tank 1 is 60 ° C. and the temperature of the lower hot water is
The temperature was 30 ° C., but when air was blown in, the water was agitated and the temperature difference between the upper and lower portions became 10 ° C. or less. In addition, since the amount of water in the heat storage tank decreases when air is blown, it is necessary to provide a means for supplying water, such as an electric pump or a manual pump (not shown). The air compressor 10 may be installed indoors, but if noise is a concern, install the air compressor 10 outside and guide air into the room by the air supply pipe and further into the heat storage tank. Is also possible.

Next, another embodiment will be described. In the second embodiment, the temperature difference in the vertical direction of the indoor air is reduced by stirring the water as the heat storage material to reduce the vertical temperature difference. As a means for stirring water, a method in which a pipe at the suction port reaches the lower part of the heat storage tank by pumping low-temperature water at the lower part of the heat storage tank and supplying it to the upper part of the heat storage tank, or a method of pumping high-temperature water at the upper part of the heat storage tank A method of supplying the heat to the lower part of the heat storage tank by a pipe of the discharge port, a method of generating a flow by rotating a screw installed in the heat storage tank by a motor, and the like are used.

In the case where a pump was used as the stirring means, a pump having a power consumption of 5.5 watts and a discharge flow rate of 10 liters per minute was used. As a result, the upper and lower temperature difference in the heat storage tank became within 10 ° C. due to the stirring of water. The use of a pump cannot humidify the room, but it is possible to quietly reduce the temperature distribution in the heat storage tank with low power consumption.

[0013]

As described above, in the present invention,
In the thermal storage radiant cooling and heating device, since it has means for blowing air into the thermal storage tank during heating or stirring means for thermal storage material,
By blowing air into the warm water in the heat storage tank during heating and releasing the air into the room, it is possible to supply high-temperature, 100% humidity air to the room and humidify the room air. No humidifier is required. Furthermore, the convection is generated in the hot water in the heat storage tank due to the rise of the blown bubbles, and the temperature of the hot water in the vertical direction is reduced because the hot water in the heat storage tank is stirred, so that the vertical temperature difference of the room temperature is reduced. There is. Further, the conventional humidifier consumes a large amount of power because water is evaporated by an electric heater, but humidifies the room with water vapor from warm water heated by a heat pump that can effectively use power as in the present invention. This also has the effect of reducing energy consumption. Furthermore, by stirring water as a heat storage material by the stirring means to reduce the temperature difference between the upper and lower parts, there is an effect that the temperature difference between the indoor air in the vertical direction can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the structure of a regenerative radiation cooling / heating device to which the present invention is applied.

FIG. 2 is a cross-sectional view showing the structure of a conventional regenerative radiation cooling / heating device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat storage tank, 2 ... Heat radiation surface, 3 ... Heat insulation cover, 5 ... Outdoor unit, 6 ... Heat transfer coil, 7 ... Heat insulation material, 10 ... Air compressor,
11 air supply pipe, 13 lid

Claims (3)

[Claims] 1. A regenerative radiant cooling / heating device installed indoors and having at least a front surface of a heat storage tank having a heat storage material therein as a heat radiation surface, comprising: means for blowing air into the heat storage tank. Air conditioning unit. 2. A regenerative radiant cooling and heating apparatus according to claim 1, wherein an air compressor constituting said air blowing means is installed outside the room. 3. A heat storage radiant cooling / heating apparatus which is installed indoors and has at least a front surface of a heat storage tank having a heat storage material therein as a heat radiation surface, comprising: means for stirring the heat storage material in the heat storage tank. Type radiation cooling and heating system.