JPS6017668A - Cooling system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cooling system such as an absorption cooling system that utilizes the property of an adsorbent such as zeolite to absorb refrigerants such as water and fluorocarbon gas, and particularly relates to Conventional configurations and problems related to built-in storage tanks In recent years, absorption cooling cycles have been reconsidered as the simplest and most efficient method, or from the perspective of energy conservation. There are cooling systems that use inorganic solid adsorbents such as silica gel. This absorption cooling system will be explained with reference to FIGS. 3 and 4. Reference numeral 11 indicates the entire cooling system, 12 indicates a metal storage tank 14 simply filled with an adsorbent 13 such as zeolite, and its lower part. This drying device is equipped with a heater 16 such as a gas burner. 161d is a condenser that condenses the refrigerant; 1A is a refrigerant storage tank that stores the condensed liquid refrigerant; and 18 is an evaporator that evaporates the refrigerant, and is a main element of the cooling system 11. Further, each element is connected and piped with steel pipes or the like. Further, a refrigerant condensation amount adjustment valve 2o is provided at the outlet portion 19 of the storage tank 14, a refrigerant adsorption amount adjustment valve 22 is provided at the inlet portion 21, and a refrigerant evaporation amount adjustment valve 2o is provided at the outlet 11111 of the refrigerant storage tank 17. 23 is interposed, and the pressure inside this pipe is previously reduced by evacuation or the like.

Next, the operating status of this cooling system 11 will be explained. 1. First, open the condensation amount adjustment valve 2o, select adsorption #1. The adjustment valve 22 and the evaporation amount adjustment valve 23 are closed, and the storage tank 14 is heated by operating the heater 15. It is heated and the iT refrigerant is desorbed. Next, this refrigerant is condensed in a condenser 16, becomes a liquid refrigerant, and is stored in a refrigerant storage tank 17. When a predetermined amount of liquid refrigerant has accumulated, the condensation amount adjustment valve 20 is closed, the heating device 15 is turned off, and although not shown in the figure, a conventional cooling device such as air cooling or water cooling provided in the drying device 12 is activated. , by cooling the storage tank 14, the adsorbent 13
to cool down. Next, the adsorption amount adjustment valve 22 is opened, and the evaporation amount adjustment valve 23 is adjusted only according to the capacity of the evaporator 18 to transport the refrigerant to the evaporator 18. The evaporator 18 is normally connected to an indoor unit (not shown) of an air conditioner, and cooled air is discharged into the room by a blower fan 24 or the like.

However, in the drying device 12 of the cooling system 11 shown above, since the adsorbent 13 is simply stored in the metal storage tank 14, first, when the refrigerant is desorbed, it is removed from the heater 15. The heat of storage tank 14
It could not be transmitted to the adsorbent 13 except through the container wall surface.

In addition, since the adsorbent 13 is an inorganic powder such as zeolite or silica gel, the heat transfer rate of the adsorbent 13 is extremely low compared to that of metal, so it acts as a heat insulator, and the storage tank 1
It is not easy to heat up to the adsorbent 13 located at the center of the refrigerant 4, and it is difficult to completely remove the adsorbed refrigerant, and the time required for heating is also quite long.

In addition, when adsorbing a refrigerant, if the powdered adsorbent 13 is strongly aggregated due to the influence of the refrigerant such as water that has entered from the inlet 21 of the storage tank 14, the refrigerant adsorbent 1
The adsorption effect on 3 is extremely reduced, that is, only the adsorbent 13 near the inlet 21 of the storage tank 14 acts, and after the adsorption capacity reaches saturation, the refrigerant moves to the internal adsorbent 13. As a result, the adsorption effect of the adsorbent 13 may be reduced due to a diffusion phenomenon. Similarly, when the drying device 12 changes from refrigerant desorption operation to adsorption operation,
Even if the storage tank 14 is cooled by an air-cooling fan or the like, only the adsorbent 13 near the inner wall surface of the storage tank 14 is cooled.
The adsorbent 13 inside is in a high temperature state, and when the refrigerant adsorption operation is performed in this state, it is found that only the adsorbent 13 near the inner wall 1fIJ+1 of the storage tank 14 causes the refrigerant adsorption action. This causes a decrease in cooling capacity.
There is a drawback of C)/ζ.

OBJECTS OF THE INVENTION Therefore, it is an object of the present invention to provide a cooling system in which the adsorption effect of an adsorbent is stably achieved in a storage tank containing an adsorbent, thereby enabling stable cooling operation.

Structure of the Invention In order to achieve this object, the present invention provides a plurality of metal pipes with good thermal conductivity for heat exchange passing through the interior of the adsorbent of a storage tank, and furthermore, a plurality of metal pipes with good thermal conductivity for heat exchange are provided in parallel with the pipes. By arranging piping for adsorption and desorption, the adsorption and desorption action of the adsorbent on the refrigerant can be performed uniformly and stably.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. As for the systems other than the storage tank, illustrations and explanations thereof will be omitted since they are based on the conventional example.

1 is a storage tank made of metal such as copper or stainless steel, and contains an adsorbent 13 such as zeolite or silica gel.
has been established. Reference numeral 2 denotes heat exchange metal pipes made of steel or the like with good thermal conductivity, which vertically penetrate the lower wall of the storage tank 1 and are arranged at equal intervals. Further, the penetrating portion between the storage tank 1 and the metal pipe 2 is joined and sealed by brazing or the like. Further, 3 is a suction/desorption piping made of metal with good thermal conductivity, which is arranged in parallel with the heat exchange metal pipe 2 at equal intervals, and the upper end is closed, and the lower t/#5 is the piping 4. is connected to. The pipe 4 communicates with the inlet portion 21 and is arranged in a meandering manner along the lower wall of the storage tank 1 so as to communicate with each lower end of the suction/desorption pipe 3.

Numerous small holes 5 for adsorption/desorption of refrigerant are provided at regular intervals in the adsorption/desorption piping 3 so that the refrigerant is absorbed or desorbed by the adsorbent 13 . The small holes 5 for refrigerant absorption are opened smaller than the particle size of the adsorbent 13 in the form of powder or granules. It may be arranged so that it does not enter through the small hole 5 for suction/desorption.

This storage tank 1 is set and used in place of the storage tank 14 provided in the conventional cooling system 11 described above.

Next, as an example, a copper tank 1 with an internal volume of 12.2 d
4 (φ300mm
X 100mmx' 420X2. Copper tank 1 when heated from the outside in O) and one in which all piping is made of copper (φ10-Omm x O, 5nun)
As a result of comparing the temperature rise rate of natural zeolite as the adsorbent 13 in the center of 4.1, the conventional system showed a temperature of 94°C after 40 minutes and 130°C after 70 minutes. , in the present invention, 160°C after 40 minutes,
After 70 minutes, the temperature was 230°C. However, the output of the heating burner of the heater 15 was set to 11.0OO1al/hr.

As is clear from this result, although the filling amount of natural zeolite (adsorbent 13) is the same, the storage tank 1 has the metal pipe 2 for heat exchange and the arrangement 3 for refrigerant adsorption/desorption. The system of the present invention is better than the conventional system simply filled with natural zeolite (adsorbent 13).
Temperature rises fast.

Also, when the tank 1 is cooled by an air-cooling fan or the like, it is similarly found that the system of the present invention does not show a constant value of 1 lll or is faster.

Furthermore, the water refrigerant that condenses in the refrigerant storage tank 17 from the start of heating takes 30 minutes to condense in the conventional method, but in the present invention, 16 water refrigerants condense in 13 minutes. The condensation time has been reduced by more than half. This means that, conventionally, the water refrigerant desorbed from the adsorbent 13 passed through the gap in the adsorbent 13 filled in the tank 14 and evaporated from the bottom to the top, but -] Some of the adsorbent 13 At a time when the water refrigerant was not sufficiently heated, the water refrigerant that had evaporated in the lower part recondensed and did not reach the refrigerant outlet 19. However, in the present invention, the water refrigerant vapor desorbed from the adsorbent 13 filled in the tank passes through the adsorption/desorption small hole 5 of the adsorption/desorption piping 3 adjacent to the adsorbent 13, and the refrigerant is removed. Due to the arrangement of the metal pipe 2 for heat exchange, the temperature rises quickly in each part of the adsorbent 13, making it difficult for the water refrigerant to condense. be guided. Even in the case of absorbing waste refrigerant, the water refrigerant that has passed through the /g medium large inlet 21 passes through the pipe 4 and the small holes 5 for absorption and desorption, and is absorbed uniformly over all parts, so the absorption speed is increased. It gets faster.

Therefore, the cooling system 11 having the drying device 12 equipped with the storage tank 1 configured as described below has a structure in which the adsorbent 1
When the refrigerant is removed from the storage tank 1, the heat from the heater 15 installed at the bottom of the storage tank 1 is transferred to the heat exchange metal pipe 2.
The adsorbent 13 can be easily heated to a predetermined temperature in a short time because it is easily conducted to the adsorbent 13 in each part through the adsorption/desorption piping 3 provided with the small hole 5 for adsorption/desorption. 13
The refrigerant desorbed from the condenser 16 easily passes through the condenser 16 in a short time.
The energy required for heating can be saved.

In addition, when adsorbing the refrigerant to the adsorbent 13, it is necessary to first cool the refrigerant to a temperature at which it can be adsorbed, or the cooling heat of air cooling or water 4 set in the drying device 12 is transferred to the wall of the storage tank 1. The heat is not only transmitted to the adsorbent 13 through the heat exchange metal pipe 2, but also uniformly cooled in a short time, thereby saving energy required for cooling.

Furthermore, when adsorbing the refrigerant, when adsorbing the refrigerant that enters from the inlet 21 of the storage tank 1, the refrigerant passes through the plurality of adsorption/desorption pipes 3 provided in the storage tank 1. Since the adsorbent 13 is adsorbed through the small holes 5, each part of the adsorbent 13 exerts an adsorption effect uniformly, and since there is a large contact area for adsorption, the adsorption speed is improved and the cooling cycle is improved.

Effects of the Invention As is clear from the above explanation, the cooling system of the present invention has a storage tank containing an adsorbent such as zeolite, and a heat exchange metal of good thermal conductivity such as copper arranged vertically at regular intervals. a pipe, and an adsorption/desorption piping made of copper or the like and having good thermal conductivity and parallel to the heat exchange metal pipe and communicating with the refrigerant inlet at one end,
A large number of small holes for suction and desorption are provided around the entire circumference of the suction and desorption piping, and the absorption cooling system having a drying device using a storage tank has the following effects.

(b) During the desorption operation of refrigerant from the adsorbent, the heat from the heater installed in the storage tank can heat the adsorbent in the storage tank uniformly and in a short time via the heat exchange metal pipe. At the same time, the refrigerant desorbed from the adsorbent is easily and smoothly guided to the condensing pipe at any location via the adsorption/desorption pipe, so that the energy required for heating can be saved.

(b) During the cooling operation of the adsorbent during preparatory work for the refrigerant adsorption operation using the adsorbent, the heat stored in the adsorbent is similarly conducted to the metal pipe for heat exchange, and then to the storage tank. Since heat is also radiated from the wall surface portion, the cooling time can be shortened and cooling can be performed, so that the energy required for cooling can be saved.

(c) During cooling operation in which the refrigerant is absorbed by the adsorbent, the refrigerant evaporated in the evaporator is uniformly absorbed anywhere in the storage tank through the small holes in the adsorption/desorption piping. The refrigerant in the evaporator is evaporated stably, allowing desired cooling operation.

As described above, the present invention has great practical effects as a cooling system that utilizes the adsorption effect of zeolite, silica gel, etc.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a storage tank used in a cooling system according to an embodiment of the present invention, and FIG.
3 is a system diagram showing a conventional absorption cooling system, and FIG. 4 is a partially cutaway perspective view of a storage tank used in this system. 1...Storage tank, 2...Metal pipe for heat exchange, 3...Piping for adsorption/desorption, 5...
Small hole for adsorption/desorption, 13...Adsorbent. Name of agent: Patent attorney Toshio Nakao and 1 other person-3
'.

Claims (1)

[Claims] A storage tank having an inlet and an outlet and containing an adsorbent such as zeolite or silica gel, a heater for heating the storage tank, and a storage tank for storing fluorocarbon gas, water vapor, etc. desorbed by heating the absorbent It is equipped with a condenser that condenses a refrigerant, a refrigerant storage tank that stores the condensed refrigerant, and an evaporator that evaporates the refrigerant. a metal vibrator for heat exchange with good thermal conductivity, and a suction/desorption pipe with good thermal conductivity such as copper, which is arranged approximately parallel to the heat exchange pipe and one end of which communicates with the inlet portion; A cooling system with small holes for suction and desorption around the entire circumference of the piping for suction and desorption.