JPS601543B2 - Thermal storage type cooling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a heat storage device attached to a cooling device, stops a compressor that consumes a large amount of power during peak power demand times, and generates only cold heat that has been previously heated in the heat storage device during off-peak times. The present invention aims to provide a thermal storage type cooling device that improves the power situation by performing cooling with air conditioning and cutting the peak power consumption by the cooling device during the daytime in summer.

In recent years, the penetration rate of household cooling devices has reached approximately 30%.
Air conditioning equipment now accounts for a very large portion of electricity consumption.

Moreover, unlike other household electrical appliances such as refrigerators and televisions, which are powered on for relatively long periods of time regardless of the season and serve as a base load, the power consumption of air conditioners is concentrated during the daytime in summer. This will result in peak load. For this reason, electric power companies are under pressure to construct large-capacity power generation facilities to handle this peak load, but power plants, which make up the majority of these facilities, require huge costs to take measures to prevent pollution. Construction is not progressing smoothly, and even if construction is possible, the increase in peak load will cause the power plant's operating rate (
The load factor) decreases, resulting in poor efficiency.

Therefore, in order to cut the peak power consumption and reduce the fluctuations in daytime and nighttime and seasonal power demand, it is possible to perform cooling with the minimum amount of power during the peak power consumption hours. In other words, some kind of heat storage mechanism is attached to the cooling device,
There has been a desire to develop a thermal storage type cooling device that uses a medium stored in a thermal storage mechanism to provide cooling during times when power consumption is at its peak, but it has not yet been put into practical use.
Nakatsuta. The present invention is a heat storage type cooling device made based on such a request, which is a heat storage type cooling device that is equipped with a heat storage device in the same cold soot system to a normal cooling cycle device to enable normal cooling operation or lid heat operation. The same evaporator in the soot system,
Concerning a device that uses a heat storage device and circulates only between the heat storage devices and makes it possible to cool the room only by storing heat without driving a compressor, the following describes the device of the present invention based on the embodiments shown in FIGS. 1 to 5. explain.

FIGS. 1 and 2 show a thermal storage type cooling device, which is a separate type cooling device composed of an outdoor unit and an indoor unit. In FIG. 1, 1 is an outdoor unit, and its casing houses a compressor 2, a condenser 3, a fan 4, a fan motor 5, and the like. On the other hand, in FIG. 2, reference numeral 6 is a floor-shaped indoor unit, and its casing includes a pressure reducing mechanism 7, an evaporator 8, a heat storage device 9, and a fan 1.
0, it has a built-in fan motor 11, etc., and a heat storage device 9.
is installed in the upper part of the casing above the evaporator 8. The outdoor unit and the indoor unit 6 are connected by a compressor 2, a condenser 3, an expansion valve 7 as a pressure reducing mechanism, and a compressor 2, a condenser 3, an expansion valve 7 as a pressure reducing mechanism, and
The solenoid valve 12 and the evaporator 8 are sequentially connected via piping to form a normal cooling cycle, and the solenoid valve 12 is configured to open during the operation of the cooling cycle.

Further, a heat storage device 9 is branched from between the expansion valve 7 and the electromagnetic valve 12 and connected in parallel to the evaporator 8 via the electromagnetic valve 13. A solenoid valve 13, a heat storage device 9, and a check valve 16 are sequentially connected to the piping, and the evaporator 8 is connected to a return piping to form a heat storage cycle,
The solenoid valve 13 is configured to be open during operation of the heat storage cycle.

A predetermined amount of cold soot, such as R-22, is filled into the cold soot systems of the cooling cycle and the heat storage cycle. Further, a heat exchanger tube 8b different from the heat exchanger tube 8a used for the cold soot system of the cooling cycle of the evaporator 8, and a heat exchanger tube different from the heat exchanger tube 9a used for the refrigerant system of the heat storage cycle of the heat storage device 9. 9b are connected in series via a solenoid valve 14 to form a circulation circuit to form a heat storage cooling cycle, and the solenoid valve 14 is configured to open during operation of the heat storage cooling cycle.

The soot system of the heat storage cooling cycle is filled with a predetermined amount of fluorocarbon-cooled zero soot R-22 or another fluorocarbon refrigerant, which is the same as the refrigerant in the cooling anaerobic system of the cooling cycle and the heat storage cycle. The evaporator 8 is formed into a cross-fin type heat exchanger, and the heat transfer tubes 8a used in the refrigerant system of the cooling cycle of the evaporator 8 and the heat transfer tubes 8b used in the cold soot system of the heat storage cooling cycle are common. Fins (not shown) are inserted for heat exchange.

Note that the heat storage device 9 may also be formed as a cross-fin type heat exchanger, and in this case, the heat transfer tubes 9a used in the cold soot system of the heat storage cycle of the heat storage device 9 and the cold soot system of the heat storage cooling cycle are used. A common fin (not shown) is inserted into the heat exchanger tube 9b to enable heat exchange.

The heat storage agent for the heat storage device 9 is water or a melting point of about 5°C.
The above heat storage agents, for example, tetradecane and its isomer, a methane group hydrocarbon having 14 carbon atoms, are used. Next, the operation of the apparatus thus configured will be explained with reference to FIG. 3, dividing it into normal cooling operation, heat storage operation, and cooling operation during peak cut.

First, in normal cooling operation using the cooling cycle, the compressor 2
, the fan motor 5 of the condenser 3 and the fan motor 11 of the evaporator 8 are driven, and when the solenoid valve 12 is opened, the refrigerant discharged from the compressor 2 is condensed in the condenser 3, and the expansion valve 7 and the solenoid valve 12 are driven. The air is evaporated in the evaporator 8, cools the indoor air, and then returns to the compressor 2. Note that during this cycle, the solenoid valve 13 and the solenoid valve 14 are closed, and soot is not allowed to flow through the cold soot systems of the heat storage cycle and the heat storage cooling cycle. Next, in the heat storage operation using the heat storage cycle, similarly to the cooling cycle, the refrigerant discharged from the compressor 2 reaches the heat storage device 9, cools and solidifies the heat storage agent stored in the device 9, and evaporates itself. , return to compressor 2.

At this time, the solenoid valve 12 and the solenoid valve 14 are closed, and cold soot is not allowed to flow through the cold soot systems of the cooling cycle and the heat cooling cycle. In operation during peak power consumption cut using the heat storage cooling cycle, the fan motor 5 of the compressor 2 and condenser 3 is stopped, the solenoid valves 12 and 13 are closed, and the evaporator 8 is closed.
When the fan motor 11 is driven and the solenoid valve 14 is opened, the evaporated refrigerant gas exchanges heat with the indoor air and rises to reach the heat storage device 9 located above the evaporator 8, where it is combined with the cooled heat storage agent. After exchanging heat, it condenses and becomes a liquid refrigerant, which descends under its own weight and returns to the evaporator 8 again.

This cycle is repeated, resulting in natural circulation heat storage cooling cycle operation. Z Therefore, electric power is consumed only by the fan motor 5, and cooling by cold storage is possible with almost no electric power consumption. In the above embodiment, the heat storage 9 in the indoor unit 6 is arranged above the evaporator 8, and the heat storage cooling cycle is performed by natural circulation due to the refrigerant's own weight. When it is not possible to arrange the and evaporator 8 in a vertical relationship, or when it is difficult to naturally circulate the cold soot due to its own weight due to the resistance of the cold soot piping that connects the two, a pump 19 is interposed in the heat storage cooling cycle to cool the cold soot. It goes without saying that the pump 15 may be used to forcefully circulate the water.

Next, a heat storage type cooling device shown in FIG. 4 will be described as another embodiment.

This device is constructed by connecting a compressor 2, a condenser 3, an expansion valve 7, an evaporator 8, and a heat storage device 9 built in the outdoor and indoor units 1 and 6 in series in this order. A cooling cycle and a heat storage cycle configured in series.
Other than the above, this device is almost the same as the device shown in FIG.

Note that the above-mentioned tetradecane is used as a heat storage agent in this device. The operation of the device shown in FIG. 4 will be explained separately for normal cooling operation, heat storage operation, and cooling operation during peak cut. First, in normal cooling operation, the fan motor 5 of the compressor 2, the condenser 3, and the fan motor 1 of the evaporator 8 are operated, and the cold soot discharged from the compressor 2 is removed from the condenser 3.
It condenses, passes through the expansion valve 7, exchanges heat with indoor air in the evaporator 8, evaporates itself, and returns to the compressor 2 through the heat storage device 9.

In the heat storage operation, the fan motor 11 of the evaporator 8 is stopped, so that there is almost no heat exchange between the cold soot and the indoor air, and the heat exchange is performed in the dark between the refrigerant and the heat storage agent in the heat storage device 9. Let it be done. Next, in the heat storage cooling operation during peak cut, the fan motor 5 of the compressor 2 and condenser 3 is stopped, the fan motor 11 of the evaporator 8 is driven, and the solenoid valve 14 is opened. In a device placed above the heat storage device 8, natural circulation is used, and in a device where the heat storage device 9 and the evaporator 8 do not have a vertical relationship, forced circulation by the pump 15 is used to perform the heat storage cooling cycle using the cooled heat storage agent in the heat storage device 9. The cold soot in the cycle is cooled and condensed by the heat transfer tubes 9b of the evaporator 8, and the cold soot flows through the heat transfer tubes 8b of the evaporator 8, cools the indoor air, and returns to the heat storage device 9 again, repeating the heat storage cooling cycle.

Furthermore, the heat storage type cooling device shown in FIG. 5 as another embodiment is similar to the device shown in FIG. Something,
Since its operation is almost the same as that of the device shown in FIG. 4, detailed explanation will be omitted.

The regenerative cooling device of the present invention has the above-mentioned structure and operation, and has the following excellent effects.

First, the device of the present invention attaches a heat generator with the same chilled soot system to the air conditioner, stops the compressor that consumes a large amount of power during peak power demand, and stores heat in the heat storage device in advance during off-peak times. Since it is possible to cool the air conditioner using only mature cold energy, it is possible to extremely reduce power consumption during the peak daytime power consumption during the summer. This has an extremely large effect in making it small. In addition, the evaporator 8 and the heat storage device 9
means that a heat storage cooling cycle is formed by heat transfer tubes 8b and 9b used in a cold soot system separate from heat transfer tubes 8a and ga used in the cooling cycle and heat storage cycle,
In other words, since there are two refrigerant systems, if the evaporator 8 and the heat storage 9 are integrated into one refrigerant system using the same heat transfer tube and can perform a cooling cycle, a heat storage cycle, and a thermal storage cooling cycle, the thermal storage cooling If the cycle is a natural circulation type, the flow rate of the lining medium is very slow, so a large amount of cold soot is required during this cycle.

Therefore, when switching from the heat storage cooling cycle to the normal cooling cycle, since a large amount of liquid refrigerant is stored in the evaporator 8, this liquid refrigerant returns to the compressor 2 and liquid compression is likely to occur.
Furthermore, if a flow divider or the like is attached to the evaporator 8, piping resistance is large in the heat storage cooling cycle, so cold soot cannot be sufficiently circulated, and the cooling capacity cannot be exerted.

Therefore, when the cold soot system is combined into one, it is not possible to install a flow divider, etc. In this case, the evaporator 8 during the cooling cycle
The disadvantage is that drifting tends to occur more easily. The present invention has been able to eliminate all of these drawbacks by providing a separate cooling system as described above.

In addition, in a device in which the evaporator 8 and the heat storage 9 are connected in parallel to the compressor 2 and the condenser 3 to provide a cooling cycle and a heat storage cycle in parallel, the cooling cycle and the heat storage cycle can be switched to provide cooling. Since it is possible to perform either cooling or heat storage operation, the evaporation temperature of cooling or heat storage can be freely selected.Thermal storage can be used as electricity when cooling is not required, such as late-night electricity, and there are no particular restrictions as a heat storage agent. There is a wide range of options regardless of melting point, such as water or tetradecane. Next, in a device in which the evaporator 8 and the heat storage device 9 are connected in series to the compressor 2 and the condenser 3, the evaporation temperature cannot be freely selected. It is best to use something that does not freeze, such as tetradecane. This device has the advantage that since the evaporator 8 and the heat storage device 9 are connected in series, the evaporator 8 can perform cooling while simultaneously storing heat when there is surplus power. Furthermore, in the heat storage cooling cycle, a device in which the heat exchanger 9 is disposed above the evaporator 8 drives only the fan motor 5 of the evaporator 8 during the heat storage cooling cycle operation, and naturally circulates the cold soot. This allows air conditioning to be performed using almost no electricity, and even in devices where the heat storage device 9 and the evaporator 8 cannot be placed in a vertical relationship, the power consumption is extremely small compared to the compressor 2, and the pump 15 By forcing cold soot to circulate, cooling can be performed using a thermal storage cooling cycle. Moreover, if the evaporator 8 and the heat storage 9 are formed into a cross-fin type heat exchanger and common fins are used for the heat transfer tubes of the respective piping systems of the heat storage cycle, the cooling cycle, and the heat storage cycle, the evaporator 8
The heat transfer coefficient of the heat storage device 9 does not vary greatly depending on the operation of the cooling cycle, heat storage cycle 0, and heat storage cooling cycle, and the heat exchange efficiency is stable, and is high in any of the above cycles. It is possible to obtain heat transfer efficiency. As described above, the present invention is a heat storage type cooling device that exhibits various excellent effects and has extremely high practical value.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an outdoor unit of a separate regenerative cooling device according to an example of the present invention, FIG. 2 is a side view of an indoor unit of the same device, and FIG. 3 is a diagram of the device shown in FIGS. FIG. 4 is an apparatus piping circuit diagram according to another embodiment, and FIG. 5 is an apparatus piping circuit diagram according to still another embodiment. DESCRIPTION OF SYMBOLS 1... Outdoor unit, 2... Compressor, 3... Condenser, 54... Fan, 5... Fan motor, 6...
... Indoor unit, 7... Pressure reduction mechanism, 8... Evaporator, 8a... Heat exchanger tube, 8b... Heat exchanger tube, 9... Heat storage device, 9a... Heat exchanger tube, 9b...・Heat transfer tube, 10... Fan, 11... Fan motor, 12... Solenoid valve, 1
3... Solenoid valve, 14... Solenoid 0 valve, 15... Pump, 16... Check valve. Kaya ``Figure 2 Figure Uke 3 Figure Hair Mu Figure Hair Zu Figure

Claims (1)

[Scope of Claims] 1. A cooling cycle comprising a compressor 2, a condenser 3, a pressure reduction mechanism 7, and an evaporator 8; a heat storage cycle comprising the compressor 2, a condenser 3, a pressure reduction mechanism 7, and a heat storage 9; The two cycles consisting of the evaporator 8 and the heat storage 9 are composed of a heat storage cooling cycle with a separate refrigerant system,
The compressor 2 is operated outside of the peak power demand to store cold heat in the cooling or heat storage device 9 through the cooling cycle or the heat storage cycle, and the compressor 2 is operated during the peak power demand.
1. A heat storage type cooling device characterized in that the heat storage cooling cycle is stopped and cooling is enabled by the heat storage cooling cycle. 2. The regenerator type cooling device according to claim 1, wherein the evaporator 8 and the regenerator 9 are connected in parallel to the compressor 2 and the condenser 3. 3. The regenerative cooling system according to claim 1, wherein the evaporator 8 and the heat storage 9 are connected in series to the compressor 2 and the condenser 3. 4 The heat storage device 9 in the heat storage cooling cycle is replaced with the evaporator 8
2. The regenerative cooling device according to claim 1, wherein the regenerative cooling device is installed at a higher position to naturally circulate the refrigerant in the thermal storage cooling cycle. 5. The regenerative cooling device according to claim 1, characterized in that a pump 15 is interposed in the thermal storage cooling cycle, and the refrigerant is forcedly circulated by the pump 15 during the thermal storage cooling cycle. 6 The evaporator 8 and the heat storage device 9 are formed into a cross-fin type heat exchanger, and the heat transfer tubes of the respective piping systems of the heat storage cycle or the cooling cycle and the heat storage cooling cycle in the evaporator 8 and the heat storage device 9 are common. The heat storage type cooling device according to claim 1, characterized in that the heat storage type cooling device is made of fins.