JPS61265493A - Cooling device employing latent heat accumulating material - Google Patents

Abstract

PURPOSE:To permit to cope with the temperature change of fluid to be cooled easily by a method wherein a plurality of cooling cells, accumulating cooling heat as latent heat, is arranged in series and respective cooling cells are constituted so as to be capable of taking out the fluid to be cooled from the outlet port side of respective cooling cells. CONSTITUTION:The cooling cells C1-Cn, which effect heat exchange between the fluid to be cooled and a heat-accumulating chamber accommodating the heat accumulating material therein through a heat pipe, are connected in series between an inflow pipeline 10 and an outflow pipeline 11 through three-way switching valves R1-Rn-1 while branch pipes P1-Pn-1, interposing non-return valves V1-Vn-1, are taken out of respective three-way switching valves R1-Rn-1 to connect them to the outflow pipeline 11 through a bypass pipe 12. When the melting points of heat-accumulating material of respective cooling cells C1-Cn are set so as to be reduced by a given temperature sequentially, the fluid is passed through all of the cooling cells C1-Cn in case the temperature of fluid to be cooled necessary for the outflow pipeline 11 is low while the three-way switching valve at the rear side of cooling cell, having corresponding melting point, is switched to introduce the fluid out of the outflow pipeline 11 through the bypass pipe 12 in case the necessitated temperature is high.

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a device for cooling various fluids such as liquids and gases used as refrigerants, and in particular, a device for cooling fluids using cooling heat stored as latent heat due to phase change. This relates to a type of cooling device.

2. Description of the Related Art For example, equipment that uses water as a low temperature source is known as a facility for cooling a cooling medium that is circulated between the heating element and the heating element in order to cool the heating element. Water has advantages such as being cheap and easy to handle, but when used at room temperature, it clearly absorbs heat and its cooling capacity per unit amount is low. As a result, a large amount of water is often required to obtain the required cooling capacity, which increases the overall size of the equipment and increases equipment costs when taking into account the cost of installation space. was there.

In order to solve these problems, cooling equipment that utilizes the latent heat associated with phase changes such as condensation and melting may be considered. When using such latent heat type cooling equipment,
In order to facilitate handling such as transportation and to enable arrangement commensurate with space, it is preferable to subdivide the heat storage material that causes a phase change into predetermined sizes.

Problems to be Solved by the Invention When it is assumed that the required cooling mass heat quantity is secured by arranging a large number of cooling cells filled with a small capacity heat storage material and having a structure capable of heat exchange, the cooling medium is When the medium is sequentially passed through the cooling cells, heat exchange is performed in each cooling cell, and the cold W medium is cooled to a predetermined temperature. However, if the temperature at the inlet of the cooling medium to the cooling cell group fluctuates while the flow rate of the cooling medium is held constant, the temperature of the cooling medium at the outlet will fluctuate. In order to correct this, it is possible to change the flow rate of the cooling medium and adjust the heat transfer time, that is, the amount of heat exchange in each cooling cell, but this may be due to fluctuation factors such as the flow state due to changes in the flow rate of the cooling medium. Since the flow rate and the heat exchange amount are not in a linear proportional relationship, adjusting the outlet temperature by controlling the flow rate would require extremely complicated control and would be expensive to implement. There are problems that require equipment.

In addition, the system is configured to circulate the cooling medium between a predetermined heating element and a group of cooling cells, and when the temperature required for the cooling medium changes due to changes in the state of the photothermal element, the cooling medium is cooled by controlling the flow rate. If the outlet temperature of the medium is adjusted, problems similar to those described above will arise.

In view of the above-mentioned circumstances, this invention provides a cooling device using a latent heat storage material that provides diversity in the configuration consisting of a large number of cooling cells, allows the outlet temperature of the fluid to be cooled to be appropriately set, and has a simple configuration. The purpose is to provide

Means for Solving the Problems In order to achieve the above object, the present invention accommodates a latent heat storage material having a melting point lower than the inflow temperature of the fluid to be cooled, and heat is transferred between the fluid to be cooled and the latent heat storage material. replaceable cooling cells,
A plurality of cooling cells are connected and arranged in series so that the fluid to be cooled flows through them in sequence, and the inflow piping is connected to the cooling cell on the most upstream side among these cooling cells, and the outflow piping is connected to the cooling cell on the most downstream side. Further, the outlet of each cooling cell except for the cooling cell on the most downstream side is communicated with the outflow pipe by a bypass pipe connected via a three-way switching valve and a branch pipe communicating with the three-way switching valve. be.

Function: Therefore, in the device of the present invention, the fluid to be cooled sent through the inflow pipe is cooled while passing through each cooling cell, and its temperature gradually decreases. The degree of decrease in temperature is
If the flow rate is constant and the structure of each cooling cell is the same,
It is uniquely determined by the temperature difference between the latent heat storage material and the fluid to be cooled in the cooling cell, and therefore shows the same temperature drop tendency until the latent heat storage material completes the phase change. In other words, the temperature at the outlet of each cooling cell becomes a predetermined, predictable temperature determined by the relationship with the temperature at the inlet, so it is necessary to switch the appropriate three-way switching valve and connect the preceding cold W cell to the outflow pipe. For example, a fluid to be cooled at any temperature can be obtained. This is true whether the temperature of the fluid to be cooled sent through the inflow pipe is constant or fluctuates.

Embodiments Next, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a system diagram showing an embodiment of the present invention, in which a plurality of cooling cells CI, C2, C3...On are arranged in series, and a fluid to be cooled such as a water web line is sequentially distributed. It has been communicated that the

Each of the cooling cells C1 to Cn has the same structure, and 1. It has a configuration in which heat is exchanged between a heat storage material 1 that stores cold concave heat due to latent heat due to a phase change, and a liquid-cooled m-fluid. Specifically, as shown in FIG. Chamber 3 and duct section 4
and filling the heat storage chamber 3 with the heat storage material 1,
One end of the heat vibrator 5 is inserted into the heat storage material 1, and the other end thereof protrudes into the duct 4, and an inlet 6 and an outflow lower are provided to allow the fluid to be cooled to flow into the duct 4. It is said to be composed of Alternatively, as shown in FIG. 3, each of the cooling cells C1 to Cn forms a heat storage v3 filled with heat storage material 1 in the center of the heat insulating container 2, and also forms header portions 8a and 8b on both sides thereof, A large number of ventilation pipes 9 connecting these header parts 8a and 8b are connected to the heat storage material 1.
It passes through the header, and liquid cooling is applied to one header part 8a and 8b! il] An inlet 6 for introducing fluid is formed, and an outflow lower is formed in the other header part 8b, and while the fluid to be cooled flows through the ventilation pipe 9, heat is generated between it and the heat storage material 1. It is supposed to be replaced.

Note that the heat storage material 1 has a melting point lower than the temperature of the liquid cooling fluid, and in consideration of requirements such as stability, safety, and availability, it is preferable to use polyethylene glycol. In that case, the molecular weight of polyethylene glycol may be the same in all cooling cells C1 to Cn, or the molecular weight of polyethylene glycol may be the same in each cooling cell.
It may be configured such that the melting points in each of the cooling cells C1 to Cn gradually decrease along the flow direction of the fluid to be cooled.

The inflow is arranged at the inlet port 6 of the cooling cell C1 on the uppermost ffE side among the cooling cells 01 to Cn! ! 10 is connected, while an outflow pipe 11 having a check valve ■n interposed therein is connected to the outflow lower of the cooling cell cn on the most downstream side.

Furthermore, each cooling cell C1 except the cooling cell Cn on the most downstream side
~ Three-way switching valves R1, R2, R3 on the On-+ outlet side.
... Rn-+ is installed, and each three-way switching valve R1 to Rn-1 is connected to the check valves V1, V2, Vn-
Branches with 1 interposed respectively %fP1, R2, R3...
- Connected to a bypass pipe 12 by P n-1, and the bypass pipe 12 is connected to the outflow pipe 11.

That is, the cooling cells C1 excluding the cooling cell Cn on the most downstream side
~Cn-+ are connected to the cooling cells on the downstream side via the three-way switching valves R1 to Rn-1, while being connected to the outflow pipe 11 by bypassing all the cooling cells on the downstream side.

Next, the operation of the apparatus configured as described above will be explained.

Melting point M1 of heat storage material 1 in each cooling cell 01 to Cn,
M2, M3...Mn are set to decrease by a constant temperature, and with each heat storage material 1 cooled and solidified, the inflow temperature TO is higher than their melting points M1 to Mn.
When the fluid to be cooled is sent from the inflow pipe 10, the fluid flows from the cooling cell C1 on the upstream side to the cooling cell Cn on the most downstream side. Heat is removed and the body is cooled. Therefore, the temperature of the fluid to be cooled decreases in stages as shown in FIG. When all the cooling cells C1 to Qn are passed through, the temperature of the cooled fluid in the outflow pipe 11 falls to T1 (<To), but the required cooled fluid temperature is higher than that, T2 (TO >7.2 >TI ), for example, in the example shown by the solid line in FIG. 4, the fourth three-way switching valve R4 is switched to connect the fourth cooling cell C4 to the branch pipe P4 and the bypass pipe. 12, the fluid to be cooled can be obtained at the required temperature T2. Further, if the inflow temperature of the fluid to be cooled becomes a temperature T3 higher than TO for some reason (in the case of the dashed line in FIG. 4), that temperature is the cooling cell CI.

Although it gradually decreases as C2... passes, it takes time to reach the required temperature T2, so T
In order to obtain the cooled fluid at the temperature of 2, the cooled fluid is passed to the seventh cooling cell C7, and the cooled fluid at the target temperature is passed through the bypass pipe 12 by the three-way switching valve R1 on the outlet side.
It may be taken out to the outflow pipe 11 through the. That is, when the inflow temperature of the fluid to be cooled increases, a cooling cell further downstream can be used as a backup. Conversely, if the inflow temperature of the fluid to be cooled is T4 (
To The target temperature T2 is reached by passing through the cooling cell C3, and therefore the third three-way switching valve R3 is switched to communicate with the bypass 1!12, thereby obtaining the cooled fluid at the target temperature T2 via the outflow pipe 11. be able to.

Furthermore, as is clear from the above description and FIG.
Since the temperature after passing through can be known, the three-way switching valve R
By appropriately operating 1 to Rn-+, liquid-cooled fluid at any temperature can be taken out.

In addition, in the above example, the melting points M1 to Mn of the heat storage material 1 in each cooling cell C1 to Cn are set to be lowered stepwise, but even if the melting points M1 to Mn of each heat storage material 1 are all the same, In that case, the temperature difference between the heat storage material 1 and the fluid to be cooled on the downstream side becomes smaller, so that the tendency of the temperature to decrease becomes slower. Further, the operation of each three-way switching valve R1 to Rn-+ may be automated, and in that case, each three-way switching valve R1 to Rn-
A temperature sensor is placed immediately before t, and each temperature sensor is electrically connected to the controller, and the pre-input set value and the value input from each temperature sensor are compared to determine whether the set value is the same as the set value. Alternatively, a three-way switching valve that is connected to the temperature sensor that outputs the closest temperature value may be configured to be switched by the output signal from the controller.

Effects of the Invention As can be clearly seen from the above explanation, the cooling device of the present invention arranges a plurality of cooling cells that can store cooling heat as latent heat, and injects liquid cooling fluid from the outlet side of each cooling cell. If the inflow temperature of the cooled fluid rises, the cooled fluid can be taken out from the cold cell further downstream, increasing the cooling time and cooling the cooled fluid whose temperature has dropped to the target temperature. If the inflow temperature of the fluid to be cooled decreases,
By taking out the fluid to be cooled from the cold cell on the more upstream side, the cooling time can be shortened and the fluid to be cooled at the target temperature can be obtained. Therefore, in this invention, by selecting the extraction position, more specifically by selecting the three-way switching valve to be switched, it is possible to easily respond to temperature changes in the cooled fluid caused by load fluctuations, etc., and it is also easy to automate. be. Furthermore, according to the present invention, since the temperature at the outlet side of each cooling cell is lowered in stages, extremely advantageous effects can be obtained in practice, such as being able to obtain a fluid to be cooled at any temperature as required. be able to.

[Brief explanation of the drawing]

FIG. 1 is a schematic system diagram showing one embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of an example of a cold m cell, FIG. 3 is a schematic cross-sectional view showing another example of a cooling cell, and FIG. The figure is an m diagram showing changes in the temperature of the fluid to be cooled. 1... Heat storage material, 5... Heat vibe, 9...
Ventilation pipe, 10... Inflow pipe, 11... Outflow pipe,
12...Bypass pipe, C1-Qn...Cooling cell, M1-Mn--Melting point, Pl-Pn-+-
...Branch pipe, R1-Rn-t...Three-way switching valve, T
O, TI, T3. T4... Influent concentration.

Claims (1)

[Claims] A plurality of cooling cells that contain a latent heat storage material having a melting point lower than the inflow temperature of the fluid to be cooled and are capable of exchanging heat between the fluid to be cooled and the latent heat storage material are connected in series to allow the fluid to be cooled to flow sequentially. The inflow piping is connected to the most upstream cooling cell among these cooling cells, the outflow piping is connected to the most downstream cooling cell, and each cooling cell except the most downstream cooling cell is 1. A cooling device using a latent heat storage material, characterized in that an outlet is communicated with the outlet pipe by a bypass pipe connected via a three-way switching valve and a branch pipe communicating therewith.