JPH10332178A - Heat storage type low-temperature air supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widely utilize a system, for example, for an amusement facility requiring a low-temperature storage and a low-temperature atmosphere for storing, for example, vegetables and fruits in an aircraft that is being parked at an airport, by supplying an ice slurry to an air heat exchanger, and performing heat exchange with air and then supplying low-temperature air. SOLUTION: A freeze 5 is operated by utilizing inexpensive power at night time, and cold water that is pumped up from a heat storage bath 7 by a cold water pump 12 is cooled to overcooled state by an evaporator 6. The overcooled water 13 is guided to the heat storage bath 7, the overcooled state is canceled in the heat storage bath 7, and ice in sherbet state with a large heat storage density is generated and heat is stored. Preferably, the ratio of ice is approximately 60%. An ice-unloading device 2 mixes sherbet-shaped ice 8 being stored with cold water when low-temperature air needs to be supplied and manufactures an ice slurry 9. The ratio of the ice 9 in the ice slurry 9 is adjusted to approximately 1.5, thus supplying low-temperature air at approximately 3 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a regenerative cold air supply system. For example, the present invention can be widely used in an aircraft cooling device for cooling an aircraft parked at an airport, a low-temperature warehouse for storing vegetables or fruits, and an amusement facility requiring a low-temperature atmosphere.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional regenerative cold air supply system. In this system, low-temperature latent heat storage material 23 in heat storage tank 31 is cooled to about −10 ° C. by direct evaporation coil 22 using refrigerator 21 to store latent heat using inexpensive power at night. Then, when low-temperature air is required, the low-temperature latent heat storage material 23 storing the latent heat is pumped out of the heat storage tank 31, sent to the brine heat exchanger 25 by the low-temperature latent heat substance pump 24, and brine (antifreeze) is used by the brine heat exchanger 25. Heat is exchanged to produce a low temperature brine of about -2 ° C., and a brine circulation circuit 28 having a brine pump 26.
To the air heat exchanger 27. Further, the low-temperature brine is exchanged with air in the air heat exchanger 27 to supply low-temperature air 29.

FIG. 3 shows another conventional regenerative cold air supply system. In this system, the brine is cooled to about −15 ° C. by an evaporator 42 using a refrigerator 41 by using inexpensive electric power at night, and the brine cools a capsule 44 filled in a heat storage tank 43 by the brine. Ice as the latent heat storage material 45 is cooled to about −10 ° C. to store the latent heat. Then, when low-temperature air is required, the brine is supplied to the heat storage tank 43 and exchanged heat with the low-temperature latent heat storage material 45 storing the latent heat to produce a low-temperature brine of about −2 ° C. The air is supplied to the air heat exchanger 48 in the circulation circuit 49. Further, the low-temperature brine is heat-exchanged with air in the air heat exchanger 48 to supply low-temperature air 50.

[0004]

[Problems to be solved by the invention]

(1) In the conventional regenerative low-temperature air supply system, when storing heat at night, low-temperature latent heat storage material 2 is stored in refrigerators 21 and 41.
Since it is necessary to cool 3,45 to about -10 ° C,
It is necessary to lower the refrigerant evaporation temperature of the refrigerators 21 and 41, and the ratio of the heat storage amount to the input of the refrigerators 21 and 41, that is, the coefficient of performance is low. (2) When extracting cold from the low-temperature latent heat storage material 23, it is necessary to use brine, and care must be taken in its management. (3) The low-temperature latent heat storage material 23 generally has a low heat storage density, and the capacity of the heat storage tank 31 increases. Further, a latent heat storage material 23 and a brine heat exchanger 25 are required, and pumps 24 and 26 are required respectively. Therefore, the installation space as a system is widened. (4) The method of encapsulating the low-temperature latent heat storage material 45 in the capsule 44 has a disadvantage that the thermal resistance is large during heat storage and heat release.

[0005]

[Means for Solving the Problems]

(1) The cold water in the heat storage tank is directly cooled by the evaporator of the refrigerator, transferred to the heat storage tank in a supercooled state, released from the supercooled state in the heat storage tank, and sherbet-like ice is generated and stored. (2) When the supply of low-temperature air is required, the sherbet-like ice in the heat storage tank is mixed with cold water by an ice dispenser to produce an ice slurry. (3) The ice slurry is supplied to an air heat exchanger and exchanged with air to supply low-temperature air.

[Operation] (1) The cold water in the heat storage tank is directly cooled to a supercooled state by the evaporator of the refrigerator. At this time, there is no need to cool the cold water to −10 ° C., and the evaporation temperature of the refrigerant can be increased. (2) Since the thermal resistance between the heat storage material and the cold water does not increase during heat storage, constant heat storage is possible continuously. (3) The supercooled water is released from the supercooling in the heat storage tank, and is stored as sherbet-like ice having a large heat storage density. (4) When dispensing ice from the heat storage tank to produce an ice slurry, by increasing the percentage of ice, the heat transfer density can be increased, the pipe cross-sectional area per unit heat transfer can be reduced, and the pipe diameter can be reduced. Piping equipment costs can be reduced. (5) The temperature of the ice slurry supplied to the air heat exchanger is zero.
° C, and low-temperature air of about 3 ° C is supplied via an air heat exchanger.

[0007]

FIG. 1 shows a regenerative low-temperature air supply system according to an embodiment of the present invention. The regenerative low-temperature air supply system of the present embodiment uses the cold water in the heat storage tank
A supercooling type ice heat storage device 1 that cools in an evaporator 6, transfers the supercooled state to a heat storage tank 7 in a supercooled state, releases the supercooled state in the heat storage tank 7, generates sherbet-like ice 8, and stores heat. An ice dispensing device 2 for dispensing ice 8 from the heat storage tank 7 into cold water to produce an ice slurry 9; an air heat exchanger 3 for exchanging heat between the ice slurry 9 and air and supplying low-temperature cold air; An ice slurry circulation circuit 4 connects the air heat exchanger 3 and circulates the ice slurry.

In the supercooled ice heat storage device 1, the refrigerator 5 is operated by using inexpensive electric power at night, and the cold water pumped from the heat storage tank 7 by the cold water pump 12 is supercooled by the evaporator 6. Cool down to At this time, there is no need to cool the cold water to −10 ° C., and the evaporation temperature of the refrigerant can be increased. The cooled supercooled water 13 is guided to the heat storage tank 7, releases the supercooled state in the heat storage tank 7, and generates sherbet-like ice 8 having a large heat storage density to store heat. The ratio of ice is preferably about 60%. Here, since the thermal resistance between the heat storage material and the cold water 13 during heat storage does not increase, constant heat storage is possible continuously.

When the supply of low-temperature air is required, the ice dispenser 2 mixes the stored sherbet-like water 8 with cold water to produce an ice slurry 9. The ratio of ice in the ice slurry 9 is adjusted to about 1.5%. Ice 8 from thermal storage tank 7
When the ice slurry 9 is manufactured by dispensing water, the ratio of ice can be increased to increase the heat transport density, reduce the pipe cross-sectional area per unit heat transported, reduce the pipe diameter, and reduce piping equipment costs. it can.

The ice slurry circulation circuit 4 supplies the adjusted ice slurry 9 to the air heat exchanger 3 by an ice slurry pump 10.
This is a circuit for returning the ice slurry 9 heated by the heat exchange in the air heat exchanger 3 to the heat storage tank 7 or the ice discharging device 2. The temperature of the ice slurry 9 supplied to the air heat exchanger 3 is 0 ° C. The air heat exchanger 3 exchanges heat between the air supplied by the blower 14 and the ice slurry 9, supplies low-temperature air 11 of about 3 ° C. to the aircraft 15, and cools the inside of the aircraft 15 while parked. Equipment.

In the present embodiment, the condenser 16 of the refrigerator 5 is of an air-cooled type, but may be of a water-cooled type. Further, the inlet of the air heat exchanger 3 may be air after cooling the aircraft. Also, the supply amount of the ice slurry 9 is large,
When it is not possible to cope with only the ice produced by night-time heat storage, it is also possible to operate by chasing the refrigerator 5 to produce the ice.

[0012]

As described above, according to the embodiment, the regenerative low-temperature air supply system of the present invention has the following effects. (1) Since an evaporator for directly cooling the cold water in the heat storage tank is used, the evaporation temperature of the refrigerant can be increased, and the coefficient of performance of the refrigerator is high and energy is saved. (2) Since the supercooled ice heat storage device that releases the supercooled cold water to generate sherbet-like ice is used, the thermal resistance between the heat storage material and the cold water does not increase during heat storage, and is continuously constant. Heat storage is possible. (3) Since a heat storage tank for storing heat as sherbet-shaped ice is used, the heat storage density is high, and since the heat storage medium and the heat transport medium to the air heat exchanger are the same, a separate heat exchanger is not required. , Only one pump is required, which saves space. (4) Since the ice dispenser and the heat exchanger are connected by an ice slurry circulation circuit to circulate the ice slurry, the heat transport density can be increased by increasing the proportion of ice in the ice slurry, and the unit can be increased. The cross-sectional area of the pipe per heat transfer can be reduced, thereby reducing the pipe diameter and reducing the cost of piping equipment. (5) heat exchange with an ice slurry having a temperature of 0 ° C. and 3 ° C.
Because it uses an air heat exchanger that can supply air at a low temperature, it can be widely used in aircraft parked at airports, low-temperature warehouses for storing vegetables, fruits, etc., and amusement facilities that require a low-temperature atmosphere. is there. (6) Because heat storage materials and heat transport media other than water are not used,
The material cost is low and management is easy.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a regenerative low-temperature air supply system according to one embodiment of the present invention.

FIG. 2 is a schematic explanatory diagram relating to a conventional regenerative low-temperature air supply system.

FIG. 3 is a schematic explanatory diagram relating to a conventional regenerative low-temperature air supply system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 supercooled ice heat storage device 2 ice dispenser 3 air heat exchanger 4 ice slurry circulation circuit 5 refrigerator 6 evaporator 7 heat storage tank 8 ice 9 ice slurry 10 ice slurry pump 11 low temperature air 12 cold water pump 13 cold water (supercooled water ) 14 Blower 15 Aircraft 16 Condenser

Claims (1)

[Claims] 1. Cold water in a heat storage tank is directly cooled by an evaporator of a refrigerator, transferred to a heat storage tank in a supercooled state, and released from the supercooled state in the heat storage tank to generate sherbet-like ice. A supercooled ice heat storage device, an ice discharge device that discharges ice from the heat storage tank into cold water to produce an ice slurry, an air heat exchanger that exchanges heat between the ice slurry and air to supply low-temperature cold air, A regenerative low-temperature air supply system comprising an ice slurry circulation circuit that connects an ice dispenser and the air heat exchanger and circulates ice slurry.