JPS5839339Y2 - Refrigerator exhaust heat recovery heating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an exhaust heat recovery heating device for a refrigerator called a heat reflame system in supermarkets and the like.

BACKGROUND ART In supermarkets and the like, there is a heating system that collects condensed heat from a refrigerator that freezes showcases into the store using an auxiliary coil during the winter to assist in heating the store.

This heating device is called a heat refray system, and the auxiliary coil used in this heating device is called a heat refray coil.It can be installed in a store by installing it inside a ventilation duct or by adding a fan. They may be made into units and installed at appropriate locations within the store.

An example of an exhaust heat recovery heating system for a refrigerator F of this type will be described below with reference to FIG. 1, in which 1 is a compressor, 2 is a water-cooled condenser, 3 is a Kurig tower, 4 is a circulation pump, 5 and 6 are electromagnetic valves (or electric valves may be used), 7 is a refrigerant connected to an evaporator installed in a store such as a supermarket, 8 is a heat reflame coil, 9 is a showcase, and 10 is an evaporator installed inside the showcase 9. In summer, the solenoid valve 5 is opened and the solenoid valve 6 is closed to operate the refrigerator F normally, and in the winter, the above-mentioned operation is reversed, and the heating system performs auxiliary heating of the supermarket 7 using the heat reframe coil 8. .

However, since the above-mentioned exhaust heat recovery heating system for refrigerator F uses a water-cooled condenser, if the capacity of the water-cooled condenser is not appropriately controlled during heat reclaim operation, the exhaust heat of the refrigerator will be transferred to the heat reclaim coil. Therefore, there is a drawback that it is not possible to sufficiently collect them in the store.

This invention uses a temperature sensor to detect when the temperature inside the store drops to a predetermined level in the winter, and in order to use the heat-to-claim coil to heat the store, two solenoid valves are activated, one of which is closed while the other is closed. Refrigerating machine waste heat recovery heating that has been improved so that sufficient exhaust heat from the refrigerator can be recovered into the store by using a command means to switch to the cooling tower fan and circulation pump operation during heat reclaim operation. It provides equipment.

Hereinafter, an embodiment of the exhaust heat recovery heating device for a refrigerator according to the present invention will be described with reference to FIG.

The compressor 1 and the water-cooled condenser 2 constitute a refrigerator F, and the water-cooled condenser 2 has cooling water cooled by a cooling tower 3 and circulated by a circulation pump 4 flowing therethrough. It seems to condense.

The compressor 1 is a solenoid valve (or electric valve, the same applies hereinafter).

) 5 to the water-cooled condenser 2, and a solenoid valve (or electric valve, hereinafter the same).

) 6 to a heat-to-claim coil 8 installed in the supermarket 7, and the heat-to-claim coil 8 is connected to a downstream piping section of the electromagnetic valve 5.

In order to freeze the showcases 9 placed at appropriate locations in the supermarket 7, an evaporator (not shown) is attached to the showcase 9, and this evaporator is connected to the compressor 1 and the water-cooled condenser 2 through piping. .

The in-store temperature controller 11 installed in the supermarket 7 is wired so that when the room temperature drops to a predetermined temperature, it detects this and serves as a command means to close the solenoid valve 5 and open the solenoid valve 6, and also to perform heat reclaim operation. Inside are 12 fans for Heat Tsuklaim coils and 3A fans for cooling tower 3.
And the circulation pump 4 is wired so as to serve as a command means to stop driving.

Next, the operation of the exhaust heat recovery heating device for a refrigerator configured as described above will be explained.

In the summer, the in-store temperature controller 11 is turned off, the solenoid valve 5 is opened, the solenoid valve 6 is closed, the refrigerator F is operated normally, and the heat-to-claim coil 8 is not used.

In winter, the indoor temperature controller 11 is turned on and the refrigerator F is operated.

When the temperature inside the store drops to a predetermined temperature, the store temperature controller 11 detects this and sends a signal, which causes the solenoid valve 5 to close, the solenoid valve 6 to open, and the fan 3A of the cooling tower 3 to The circulation pump 4 stops driving.

Therefore, the heat-to-claim coil 8 recovers the condensation heat of the compressor 1 and performs auxiliary heating in the supermarket 7, and also functions as a condenser.While this auxiliary heating is performed, the water-cooled condenser Since the cooling water is not circulated in the coil 2, it simply functions as a receiver, so that the exhaust heat recovery heating of the refrigerator F by the heat claim coil 8 is performed satisfactorily.

When the heating of the supermarket 7 continues for a certain period of time and the room temperature rises to a predetermined temperature, it is necessary to stop the heating for a certain period of time. This signal causes the solenoid valve 5 to open and the solenoid valve 6 to close, and also to drive the fan 3A and circulation pump 4 of the cooling tower 3, so that the heat to claim coil 8
The interior of the store is not heated, and the water-cooled condenser 2 exhibits its original ability.

Next, Figure 3 shows a circuit diagram that has been improved to keep the temperature of the blowing air passing through the heat-claimed coil high. This problem changes greatly due to changes in the amount of heat, and when the coil inlet air temperature is low or the amount of exhaust heat from the refrigerator is low, the air blown out of the Heat Tsu Claim Coil becomes cold and the Heat Tsu Claim Coil does not perform its role of heating the store. This temperature sensor 13 is installed on the blowing side of the Heat Tsu Claim Coil 8, and this temperature sensor 13 detects when the blowing air temperature drops to a predetermined temperature and When the temperature rises to a certain level, it is detected and a signal is sent out, and this signal is used as a command means to switch the tap of the heat claim coil fan 12 from high speed rotation to low speed rotation and vice versa.

During the heat reclaim operation, if the air blown from the heat reclaim coil 8 is below a predetermined temperature, the coil blown air temperature detector 13 detects this and sends a signal to the heat reclaim coil fan 12. By switching the fan motor to a weak tap (wiring with low rotation speed) and lowering the air volume, the temperature of the blown air can be kept high. The detector 13 emits a signal again, and the fan 12 is switched to high tap, increasing the air volume and maintaining the blowing temperature within an appropriate range.

Note that a pressure switch that senses condensation pressure may be used instead of the temperature detector 13 (thermostat) to change the taps of the fan 12, or the fan motor may be continuously controlled.

Next, FIG. 4 shows improvements in the installation location and the blowout location of a unit made by attaching a fan to the Heat Tsu Claim Coil. The Heat Tsu Claim Coil 8 and the fan 12 are housed in the unit case 14. The duct 15 for blowing air is installed vertically on the back surface of the showcase 7, and the air outlet 16 at the lower end of the duct is installed facing the bottom side of the showcase 7. .

Therefore, since the coil-blown air is blown downward from the showcase 7, the difference in air temperature between the upper and lower sides of the front side of the showcase is equalized, and shoppers are no longer exposed to the cold air that conventionally spilled from the showcase. The installation of the heat reclaim unit is done in such a way that it does not take up much space and allows the store to be used effectively.

As explained above, the waste heat recovery heating device for a refrigerator of the present invention has a refrigerator that is equipped with a water-cooled condenser, a compressor, and an evaporator and that freezes a showcase, and two solenoid valves or electric valves. In a configuration in which a heat reclaim coil is provided that can be switched between use and non-use, and this coil provides auxiliary heating in the store only during the winter, the store temperature sensor is connected to the above two solenoid valves or Since the electric valve is used as a command means to switch and drive, and the fan and circulation pump of the cooling tower for water-cooled condensation are stopped only during the heat reclaim operation, the water-cooled condenser is stopped during the heat reclaim operation. It simply acts as a receiver, and for this reason, the heat reframe coil releases all of the waste heat from the refrigerator, allowing the maximum amount of heat to be recovered into the store and achieving the intended purpose.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram for explaining the basic configuration of an exhaust heat recovery heating system for a refrigerator, Fig. 2 is a circuit diagram of an exhaust heat recovery heating system for a refrigerator according to an embodiment of the present invention, and Fig. 3 is a circuit diagram for explaining the basic configuration of an exhaust heat recovery heating system for a refrigerator. FIG. 2 is a circuit diagram of a modified example, and FIG. 4 is a perspective view of a main part of another modified example. 1...Compressor, 2...Water-cooled condenser, 3
... Cooling tower, 4 ... Circulation pump, 5, 6 ... Solenoid valve (or electric valve), 8.
...Heat reflame coil, 9...Indoor air temperature detector.

Claims (1)

[Scope of utility model registration request] This refrigerator is equipped with a water-cooled condenser, a compressor, and an evaporator to freeze the showcase, and is equipped with a heat reframe coil that can be switched on and off using two electromagnetic valves or electric valves. In an exhaust heat recovery heating system for a refrigerator configured to perform auxiliary heating in a store only in the winter using a coil, a command means for switching and driving the two electromagnetic valves or electric valves so that the store temperature controller performs heat reclaim operation; An exhaust heat recovery heating device for a refrigerator, characterized in that the fan and circulation pump of the cleave tower for the water-cooled condenser are used as a command means to stop only the heat claim coil.