JPH0359348B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pump type air conditioner that stores cold air at night and uses it to perform air conditioning during the day.

Cooling systems that store cold energy during the night when the outside air temperature is low and use it as a cooling heat source during the day, for example, circulate heat source water between a heat storage water tank installed in the basement of a building and a heat pump unit in each room. This is often used in water heat source heat pump air conditioning systems. However, such building air conditioning systems require large-scale equipment, and although they can be applied to large buildings,
It cannot be applied to ordinary air source heat pump units used for general households or for independent air conditioning in each room.

The present invention aims to provide a cooling system in which each heat pump unit (air conditioner) with an air heat source or a water heat source can independently utilize nighttime cold air for daytime cooling, that is, a heat pump that itself has a heat storage function. It has been done. That is, the air conditioner with a heat storage function of the present invention is a heat pump in which a refrigerant circulation path is formed in the order of an evaporator as an indoor heat exchanger, a compressor, a condenser as an outdoor heat exchanger, an expansion valve, and the evaporator. In the type air conditioner, another condenser is switchably provided in the refrigerant circulation path, and the other condenser is placed in a heat storage tank filled with a heat storage material so as to exchange heat with the heat storage material. An outside air passage for exchanging heat between the substance and the outside air is provided in the heat storage tank, a blower is installed for blowing outside air into this outside air passage, and a temperature sensor is installed to detect the temperature of the outside air taken into this outside air passage. installation,
The present invention is characterized in that a temperature adjustment design is provided to control the drive of the blower based on the detected value of the temperature sensor.

The embodiment shown in Fig. 1 shows an example in which two condensers are connected in parallel to the refrigerant circuit. In the figure, 6 is a compressor, 7 is an accumulator, and 8 is an evaporator (indoor heat exchanger ), 9 is an indoor fan for supplying air to the evaporator 8, 10 is a motor, 11 is an expansion valve, 12 and 13 are electromagnetic valves for selectively switching the flow of refrigerant to the condenser, 14 15 indicates an outdoor fan for supplying air to the condenser (outdoor heat exchanger), and 15 indicates its motor. A compressor 6 and an accumulator 7 are connected between the condenser and the evaporator 8.
A heat pump with refrigerant piped through an expansion valve 11 and equipped with an indoor fan 9 and an outdoor fan 14 is similar in principle to a conventional air heat source heat pump unit (air conditioner);
Another condenser is arranged switchably in the refrigerant circuit,
The heat pump of the present invention is characterized by the fact that it is installed in a characteristic heat storage tank 4.

The heat storage tank 4 consists of a container or a collection of containers enclosing a substance 3 having a large latent heat of fusion and a phase transformation temperature close to the outside temperature.
56-165369 and the structures described in the drawings can be suitably used. As the heat storage material 3, those described in Japanese Patent Application No. 1983-76299 filed by the same applicant can be used, including paraffin, Na ₂ SO ₄ .10H ₂ O, CaCl ₂ .6H ₂ O,
Preferred are salts such as Na ₂ CO ₃ .10H ₂ O, NH ₄ Cl, etc. alone or in combination.

In any case, the heat storage tank 4 used in the present invention can exchange heat between the latent heat storage material 3 sealed therein and the refrigerant in the heat pump circuit, and can also exchange heat between the latent heat storage material 3 and the outside air. As such, a condenser and an outside air passage 5 are arranged within this heat storage tank 4. The outside air is taken into the outside air passage 5 through the outside air intake port 16 by driving the outside air fan 17, and after exchanging heat with the heat storage material in the outside air passage 5, it is exhausted. At that time, the temperature of the outside air taken into this outside air passage 5 is detected by the temperature sensor 18,
The drive of the outside air fan 17 is controlled based on the detected value. Specifically, a temperature lower than a preset temperature in the temperature controller 20 (a temperature lower by a certain temperature than the daytime temperature, for example, a temperature 10 degrees Celsius lower than the peak outside air temperature of the previous day) is inputted from the temperature sensor 18. Then, the contacts of this temperature controller 20 close, and the motor 21 of the outside air fan 17 is driven.

To explain the operation of the heat pump according to the embodiment of FIG. Heat storage tank 4
to store cold heat. When cold air is required during this heat storage movement, the solenoid valve 12 is closed, the solenoid valve 13 is opened, and the indoor fan 9 and the outdoor fan 14 are closed.
In addition, normal cooling operation may be performed by driving the compressor 6 and using the condenser. During cooling operation during daytime hours when the outside air temperature has reached its peak, the solenoid valve 12 is opened, the solenoid valve 13 is closed, the condenser is switched to the side inside the heat storage tank, and the heat pump is operated. The cold heat stored in the heat storage tank absorbs the heat radiated from the condenser. As a result, hot heat is stored in the heat storage tank, but this heat is radiated to the outside air during the aforementioned heat storage operation using low-temperature outside air at night or early in the morning, and cold heat is stored.

According to this motion mode, even during the day when the outside air temperature is rising, the condenser exchanges heat with the heat storage material that is lower than the outside air temperature, so the efficiency of the refrigeration cycle is lower than that of the conventional air heat source. Unlike heat pumps, they no longer drop during the day, and can be operated with good efficiency. Therefore, a heat pump with a small rated capacity can be configured as an air conditioner, and the power consumption during operation can be reduced, which in turn contributes to smoothing the power supply during the daytime when cooling power reaches its peak. It will also contribute to reducing peak cooling power consumption at the national level.

Figures 2 and 3 show the embodiment of Figure 1, except that the condenser and refrigerant circuit are connected in series, and a bypass path is provided to enable selective switching. It has the same configuration as that explained in Embodiment 1, and in this case as well, heat storage operation and cooling operation are carried out by the same operations as explained in the embodiment of FIG. can be effective. In the example shown in Fig. 3, a bypass path is also provided on the outside air condenser side, and a solenoid valve 13' is installed in it. You can choose to use or not use a condenser for outside air.

In the embodiment described above, two condensers, a heat storage tank condenser and an outside air condenser, are connected to the refrigerant circuit in a switchable manner. One or more of them can be installed in a single or multiple heat storage tank, and heat storage operation and cooling operation can be performed using the same principle as described above.

[Brief explanation of drawings]

Fig. 1 is an equipment arrangement system diagram showing one embodiment of the air conditioner of the present invention, Fig. 2 is an equipment arrangement system diagram showing another embodiment, and Fig. 3 is an equipment arrangement system diagram showing another embodiment. It is a diagram. , ... Condenser, 3 ... Heat storage material, 4 ... Heat storage tank, 5 ... Outside air passage, 6 ... Compressor, 7 ... Accumulator, 8 ... Evaporator, 9 ... Indoor fan, 11 ... ...Expansion valve, 12, 13...Solenoid valve, 1
4...Outdoor fan.

Claims (1)

[Scope of Claims] 1. A heat pump type air conditioner in which a refrigerant circulation path is formed in the order of an evaporator as an indoor heat exchanger → a compressor → a condenser as an outdoor heat exchanger → an expansion valve → the evaporator, Another condenser is switchably provided in the refrigerant circulation path, and the other condenser is arranged in a heat storage tank filled with a heat storage material so as to exchange heat with the heat storage material, and the heat storage material and outside air are connected to each other. An outside air passage for heat exchange is provided in the heat storage tank, a blower is installed for blowing outside air into this outside air passage, and a temperature sensor is installed to detect the temperature of the outside air taken into this outside air passage. 1. A thermal storage type air conditioner, comprising a temperature controller that controls driving of the blower based on a detected value. 2. The heat storage type air conditioner according to claim 1, wherein the heat storage tank is a latent heat storage tank formed by enclosing a substance with a low melting point that can be melted at outside air temperature.