JP2020153554A - Adsorptive refrigeration machine - Google Patents

Abstract

To suppress excessive temperature drop of cooling water in an adsorptive refrigeration machine.SOLUTION: An adsorptive refrigeration machine comprises: an evaporation unit that evaporates a refrigerant; a pair of adsorbers each provided with an adsorbent that can adsorb and desorb the refrigerant according to a temperature; a condensation unit that cools and condenses the refrigerant; a hot water flow passage through which hot water flowing through one of the pair of adsorbers passes; a cooling water flow passage through which cooling water flowing to the other of the pair of adsorbers passes; and a heat exchanger that exchanges heat between the hot water flow passage and the cooling water flow passage so that the temperature of the cooling water falls within a predetermined temperature range.SELECTED DRAWING: Figure 1

Description

The present invention relates to an adsorption refrigerator.

In an adsorption chiller, there is known a cooling water antifreeze technique for raising the temperature of cooling water by exchanging heat between a pipe through which a heat medium heated by a boiler flows and a pipe through which cooling water flows (for example,). See Patent Document 1). Even when the temperature of the cooling water does not become low enough to freeze, the salt contained in the adsorbent may deliquesce when the temperature of the cooling water decreases.
[Prior art literature]
[Patent Document]
[Patent Document 1] Japanese Patent Application Laid-Open No. 11-257788

In the adsorption type refrigerator, it is desirable to prevent the deliquescent of the adsorbent by suppressing an excessive temperature drop of the cooling water.

In the first aspect of the present invention, an adsorption refrigerator is provided. The adsorption refrigerator may include an evaporator, a pair of adsorbers, and a condensing unit. The evaporating unit may evaporate the refrigerant. Each of the pair of adsorbers may be provided with an adsorbent capable of adsorbing and desorbing the refrigerant according to the temperature. The condensing unit may cool and condense the refrigerant. The adsorption chiller may include a hot water flow path and a cooling water flow path. The hot water flow path may be a flow path through which hot water flowing through one of the pair of adsorbers passes. The cooling water flow path may be a flow path through which the cooling water flowing through the other of the pair of adsorbers passes. The adsorption refrigerator may be equipped with a heat exchanger. The heat exchanger may exchange heat between the hot water flow path and the cooling water flow path so that the temperature of the cooling water falls within a predetermined temperature range.

At least one of the hot water flow path and the cooling water flow path may be branched into a first flow path that passes through the heat exchanger and a second flow path that bypasses the heat exchanger. The adsorption refrigerator may include a control unit. The control unit may control the flow rate of hot water or cooling water flowing through the first flow path.

The hot water flow path may pass through the heat exchanger after passing through one of the pair of adsorbers.

The control unit may switch the flow path through which the hot water flows so that the hot water flows through either the first flow path or the second flow path according to the water temperature of the cooling water.

When the water temperature of the cooling water is lower than a predetermined temperature, the control unit may switch the flow path through which the hot water flows so that the hot water flows through the first flow path.

The cooling water flow path may pass through the heat exchanger after passing through the condensing part and before passing through the adsorbent.

The adsorption type refrigerating machine has a first operation mode in which one of the adsorbers functions as an adsorbing part for adsorbing the refrigerant and the other adsorber functions as a desorbing part for desorbing the refrigerant, and one adsorption type. The device may be operated so as to be alternately switched between a second operation mode in which the device functions as a desorption portion on which the refrigerant is desorbed and the other adsorber functions as a adsorption section on which the adsorbent is adsorbed. The adsorbent provided in the adsorption unit may adsorb the refrigerant evaporated by the evaporation unit. The refrigerant may be desorbed from the adsorbent provided in the desorption portion. The desorbed refrigerant may be condensed by the condensing portion. The evaporating part may evaporate the refrigerant condensed by the condensing part.

The control unit may control the flow rate of hot water flowing through the first flow path according to the switching timing between the first operation mode and the second operation mode.

The adsorption type refrigerator has a temperature setting unit that lowers the temperature range in the first operation mode to lower than the temperature range in the second operation mode when one adsorber is deteriorated from the other adsorber. You may be prepared.

When one adsorber is deteriorated from the other adsorber, the control unit measures the flow rate of hot water flowing through the first flow path in the first operation mode and the first flow rate in the second operation mode. It may be less than the flow rate of hot water flowing through the road.

The adsorption type refrigerator may include a temperature setting unit that sets a predetermined temperature range so that the temperature of the cooling water becomes lower according to the deterioration of the pair of adsorbers.

The adsorption type refrigerating machine has a first operation mode in which one of the adsorbers functions as an adsorbing part for adsorbing the refrigerant and the other adsorber functions as a desorbing part for desorbing the refrigerant, and one adsorption type. The device may be operated so as to be alternately switched between a second operation mode in which the device functions as a desorption portion on which the refrigerant is desorbed and the other adsorber functions as a adsorption section on which the adsorbent is adsorbed. The adsorbent provided in the adsorption unit may adsorb the refrigerant evaporated by the evaporation unit. The refrigerant may be desorbed from the adsorbent provided in the desorption portion. The desorbed refrigerant may be condensed by the condensing portion. The evaporating part may evaporate the refrigerant condensed by the condensing part. The adsorption type refrigerator may adjust the time of the first operation mode and the time of the second operation mode based on the degree of deterioration of one adsorber and the degree of deterioration of the other adsorber.

The adsorption type refrigerator may have a heat storage unit. The heat storage unit may temporarily store the heat of the hot water flowing through one of the pair of adsorbers. The heat exchanger may exchange heat between the hot water flow path and the cooling water flow path in the heat storage unit.

The hot water channel may obtain hot water from a heat source. The heat storage unit may come into contact with the heat source.

The outline of the above invention does not list all the necessary features of the present invention. Subcombinations of these feature groups can also be inventions.

It is a figure which shows an example of the flow path at the time of heat exchange between a hot water flow path and a cooling water flow path in the 1st operation mode of the adsorption type refrigerator according to 1st Embodiment of this invention. It is a figure which shows an example of the flow path at the time of heat exchange between a hot water flow path and a cooling water flow path in the 2nd operation mode of the adsorption type refrigerator shown in FIG. It is a figure which shows an example of the flow path when heat exchange is not performed between a hot water flow path and a cooling water flow path in the 1st operation mode of the adsorption type refrigerator shown in FIG. It is a figure which shows an example of the flow path when heat exchange is not performed between a hot water flow path and a cooling water flow path in the 2nd operation mode of the adsorption type refrigerator shown in FIG. This is an example of an adsorption isotherm of an adsorbent. It is a flowchart which shows an example of the process of the adsorption type refrigerator 1. It is a flowchart which shows the other example of the processing of the adsorption type refrigerator 1. It is a flowchart which shows the other example of the processing of the adsorption type refrigerator 1. It is a figure which shows an example of the adsorption type refrigerator by 2nd Embodiment of this invention. It is a figure which shows an example of the process of the adsorption type refrigerator 1 shown in FIG. It is a figure which shows another example of the process of the adsorption type refrigerator 1 shown in FIG. It is a figure which shows another example of the process of the adsorption type refrigerator 1 shown in FIG. It is a figure which shows an example of the adsorption type refrigerator in 3rd Embodiment of this invention. It is a figure which shows an example of the adsorption type refrigerator in 4th Embodiment of this invention. It is a figure which shows an example of the adsorption type refrigerator in 5th Embodiment of this invention.

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the inventions claimed in the claims. Also, not all combinations of features described in the embodiments are essential to the means of solving the invention.

FIG. 1 is a diagram showing an example of a flow path when heat is exchanged between a hot water flow path and a cooling water flow path in the first operation mode of the adsorption refrigerator according to the first embodiment of the present invention. FIG. 2 is a diagram showing an example of a flow path when heat is exchanged between the hot water flow path and the cooling water flow path in the second operation mode of the adsorption type refrigerator shown in FIG. The adsorption type refrigerator 1 makes cold water or cold liquid using, for example, waste hot water. The waste heat water may be generated by using a heat source such as computer waste heat of a data center or the like and waste heat water of a factory. The adsorption refrigerator 1 evaporates the refrigerant in the low-temperature and low-pressure evaporation section. Cold water or cold liquid cooled by the heat of vaporization is generated in the evaporation part. The refrigerant may be water.

As shown in FIG. 1, the adsorption type refrigerator includes a pair of adsorbers 10, 11, an evaporation unit 20, and a condensing unit 30. The pair of adsorbers 10 and 11 may be a pair of adsorbers 10 and 11 in a set of two tanks. One of the pair of adsorbers 10 and 11 functions as an adsorbent and the other functions as a desorption portion. In the first operation mode shown in FIG. 1, the first adsorber 10 functions as a suction unit, and the second adsorber 11 functions as a desorption unit. On the other hand, in the second operation mode shown in FIG. 2, the first adsorber 10 functions as a detachable part, and the second adsorber 11 functions as a suction part. In the adsorption type refrigerator 1, the operation is such that the first operation mode and the second operation mode are alternately switched.

Each of the adsorbers 10 and 11 is provided with adsorbents 12 and 13 capable of adsorbing and desorbing the refrigerant according to the temperature, respectively. The adsorbents 12 and 13 may contain salts. The adsorbents 12 and 13 may be a water adsorbent containing a porous body and a composite salt contained in the porous body, and the heat of dissolution of the composite salt in water may be negative. Complex _{salt, NaCl, NaBr · 2H 2 O} , KBr, KCl, CaCl 2 · 6H 2 O, may comprise a salt selected from the KI. The porous body may be a metal oxide nanoparticle condensate containing one or more selected from SiO ₂ , TiO ₂ , ZrO ₂ , Al ₂ O ₃ , and MgO. However, the adsorbents 12 and 13 are not limited to these cases.

The adsorption type refrigerator 1 includes an evaporation unit 20 and a condensation unit 30. The evaporation unit 20 evaporates the refrigerant. The adsorbers 10 and 11 and the evaporation unit 20 communicate with each other via a valve. Further, the adsorbers 10 and 11 and the condensing portion 30 are also communicated with each other via a valve. The valve is not shown in FIG.

Hot water flows through one of the pair of adsorbers 10 and 11, and cooling water flows through the other of the pair of adsorbers 10 and 11. In one example, the temperature of the hot water may be 50 ° C. or higher and 100 ° C. or lower. In this example, the adsorption type refrigerator 1 includes a distribution path 4 passing through the first adsorber 10 and a distribution path 5 passing through the second adsorber 11. Each inflow port of the flow path 4 and the flow path 5 may be connected to two output ports of the first four-way valve 14. A hot water path 2a through which hot water passes and a cooling water path 3a through which cooling water passes may be connected to the two input ports of the first four-way valve 14. On the other hand, each of the outlets of the flow path 4 and the flow path 5 may be connected to the two inlets of the second four-way valve 15. A hot water path 2b through which hot water passes and a cooling water path 3b through which cooling water passes may be connected to the two output ports of the second four-way valve 15.

In the adsorption type refrigerator 1, the hot water and cooling water flow paths are switched by the first four-way valve 14 and the second four-way valve 15. In the first operation mode, the distribution path 4 is selected as the cooling water path through which the cooling water flows, and the distribution path 5 is selected as the hot water path through which the hot water flows. On the other hand, in the second operation mode, the distribution path 5 is selected as the cooling water path through which the cooling water flows, and the distribution path 4 is selected as the hot water path through which the hot water flows. The first operation mode and the second operation mode are alternately switched, for example, every time of 3 minutes or more and 20 minutes or less.

One of the pair of adsorbers 10 and 11 functions as an adsorbent and the other functions as a desorption portion. First, in the first operation mode shown in FIG. 1, the first adsorber 10 functions as a suction unit, and the second adsorber 11 functions as a desorption unit. The adsorbent 12 adsorbs the refrigerant as the cooling water flows through the first adsorber 10. As the adsorbent 12 adsorbs the refrigerant in the first adsorber 10, the pressure in the evaporation unit 20 decreases, and the refrigerant in the evaporation unit 20 easily evaporates. The cold water 21 is cooled and output by the generation of heat of vaporization.

There is also a limit to the amount of refrigerant that can be adsorbed by the adsorbent 12 in the first adsorber 10. Therefore, the operation mode is switched from the first operation mode to the second operation mode. In the second operation mode shown in FIG. 2, the first adsorber 10 functions as a detachable part, and the second adsorber 11 functions as a suction part. When hot water flows through the first adsorber 10, the refrigerant is desorbed from the adsorbent 12. As a result, the adsorbent 12 is regenerated into a state in which the refrigerant can be adsorbed again. The desorbed refrigerant vapor moves to the condensing unit 30. The condensing unit 30 condenses the refrigerant vapor into a liquid refrigerant. The liquid refrigerant moves to the evaporation unit 20 via a pipe or the like.

In FIGS. 1 and 2, thick arrows indicate the flow of cooling water, and thin arrows indicate the flow of hot water. The adsorption type refrigerator 1 includes a supply mechanism for supplying hot water to one of the pair of adsorbers 10 and 11. In this example, the adsorption type refrigerator 1 includes a hot water path 2a through which hot water passes, a hot water pump 8, and a hot water path 2b as a hot water supply mechanism. The adsorption type refrigerator 1 includes a supply mechanism for supplying cooling water to the other of the pair of adsorbers 10 and 11. In this example, the adsorption type refrigerator 1 includes a cooling water pump 9, a cooling water path 3a, and a cooling water path 3b as a cooling water supply mechanism.

The cooling water is generated by the cooling water generation unit 16. The cooling water generation unit 16 may be a cooling tower (cooling tower). Cooling water discharged from the cooling water generation unit 16 in the first operation mode in which the first adsorber 10 functions as an adsorbent (adsorption tank) and the second adsorber 11 functions as a desorption unit (desorption tank). As shown in FIG. 1, a cooling water pump 9, a cooling water path 3a, a heat exchanger 40, a first four-way valve 14, a flow path 4, a first suction device 10, a second four-way valve 15, and a condensing section. It circulates through 30 and the cooling water path 3b, and returns to the cooling water generation unit 16. These cooling water pump 9, cooling water path 3a, heat exchanger 40, first four-way valve 14, flow path 4, first adsorber 10, second four-way valve 15, condensing section 30, and cooling water path 3b , Form a cooling water flow path through which the cooling water passes.

The cooling water pump 9 moves the cooling water along the cooling water flow path. The installation position of the cooling water pump 9 is not limited to the case of FIG. The cooling water flow path is not limited to the case shown in FIG. The cooling water flows through the adsorber 10 of the pair of adsorbers 10 and 11. The cooling water cools the adsorbent when the adsorbent adsorbs the refrigerant and promotes the adsorption of the refrigerant.

Hot water may be generated by using a heat source such as exhaust heat from a computer such as a data center or exhaust hot water from a factory. In this example, the hot water flows through the hot water main pipe 17. In the first operation mode, the hot water acquired from the hot water main pipe 17 has a hot water path 2a, a hot water pump 8, a first four-way valve 14, a distribution path 5, a second adsorber 11, and a second, as shown in FIG. 2 Four-way valve 15 and hot water path 2b are circulated. The outlet side of the hot water path 2b branches into a first flow path 6 and a second flow path 7.

The first flow path 6 is a flow path through the heat exchanger 40, so to speak, a bypass flow path. The second flow path 7 is a path that bypasses the heat exchanger 40. The hot water that has passed through the first flow path 6 or the second flow path 7 may join the hot water main pipe 17. A first valve 51 is provided in the first flow path 6. A second valve 52 is provided in the second flow path 7. The first valve 51 is an example of a first flow rate control unit that adjusts the flow rate of hot water or cooling water in the first flow path 6. The second valve 52 is an example of a second flow rate control unit that adjusts the flow rate of hot water or cooling water in the second flow path 7.

In the example shown in FIG. 1, the first valve 51 is open and the second valve 52 is closed. Therefore, the hot water flows through the first flow path 6. As a result, the heat exchanger 40 exchanges heat between the hot water path and the cooling water path. The temperature of the cooling water is raised by heat exchange. In this example, a temperature sensor 18 for measuring the temperature of the cooling water at a place where it has passed through the heat exchanger 40 is provided. Further, the third valve 53 may be provided in the hot water flow path after passing through the heat exchanger 40. The third valve 53 may be open when the first valve 51 is open, and the third valve 53 may be closed when the first valve 51 is closed. However, the third valve 53 may be omitted.

The hot water path 2a, the hot water pump 8, the first four-way valve 14, the distribution path 5, the second adsorber 11, the second four-way valve 15, the hot water path 2b, the first flow path 6, and the second flow path 7 are Form a hot water flow path through which hot water passes. However, the hot water flow path is not limited to the case shown in FIG. The hot water heats the adsorbent at the time of desorption (regeneration) of the adsorbent to desorb the adsorbed refrigerant.

The hot water flow path passes through the heat exchanger 40 at the portion of the first flow path 6 after passing through the detachable portion which is one of the pair of adsorbers 10 and 11. Therefore, hot water can flow through the desorbing portion (adsorber 11 in FIG. 1) before the temperature drops due to heat exchange, and the desorption ability of the refrigerant from the adsorbent is prevented from deteriorating.

As shown in FIG. 2, in the second operation mode in which the first adsorber 10 functions as a desorption portion (desorption tank) and the second adsorber 11 functions as a suction portion (adsorption tank), cooling water is generated. The cooling water discharged from the section 16 is a cooling water pump 9, a cooling water path 3a, a heat exchanger 40, a first four-way valve 14, a flow path 5, a second adsorber 11, a second four-way valve 15, and a condensing section. It circulates through 30 and the cooling water path 3b, and returns to the cooling water generation unit 16. These cooling water pump 9, cooling water path 3a, heat exchanger 40, first four-way valve 14, flow path 5, second suction device 10, second four-way valve 15, condensing section 30, and cooling water path 3b , Form a cooling water flow path through which the cooling water passes.

In the second operation mode, the hot water acquired from the hot water main pipe 17 has a hot water path 2a, a hot water pump 8, a first four-way valve 14, a distribution path 4, a first adsorber 10, and a first, as shown in FIG. 2 Four-way valve 15 and hot water path 2b are circulated. The outlet side of the hot water path 2b branches into a first flow path 6 and a second flow path 7.

The hot water path 2a, the hot water pump 8, the first four-way valve 14, the distribution path 5, the second adsorber 11, the second four-way valve 15, the hot water path 2b, the first flow path 6, and the second flow path 7 , Form a hot water flow path through which hot water passes.

The two adsorbers 10 and 11 alternately perform the adsorption step and the desorption step. The water vapor in the evaporation unit 20 evaporates in the adsorption step, and the heat of vaporization at that time cools the medium flowing in the evaporator and outputs it.

The adsorption refrigerator 1 of the present embodiment includes a control unit 50. The control unit 50 may be a computer. The control unit 50 controls the flow rate of hot water flowing through the first flow path 6. The control unit 50 may switch the path through which the hot water flows so that the hot water flows through either the first flow path 6 or the second flow path 7 according to the water temperature of the cooling water. The adsorption type refrigerator 1 may include a temperature sensor 18 that acquires temperature information of cooling water. The temperature sensor 18 may be provided at the outlet from the heat exchanger 40. However, the mounting position of the temperature sensor 18 is not limited to this case. Further, the adsorption type refrigerator 1 may include a temperature sensor 19 that measures the temperature information of the cold water 21 cooled by the heat of vaporization accompanying the evaporation of the refrigerant in the evaporation unit 20.

The control unit 50 receives the temperature information of the cooling water and the temperature information of the cold water 21 in the evaporation unit 20. Further, the control unit 50 may control at least one of the hot water pump 8 and the cooling water pump 9. In one example, the control unit 50 controls the cooling water pump 9. Further, the control unit 50 may be communicably connected to the first valve 51 and the second valve 52, and may control the opening and closing of each of the first valve 51 and the second valve 52. In this case, the control unit 50 switches the path through which the hot water flows so that the hot water flows through either the first path or the second path according to the water temperature of the cooling water. When the water temperature of the cooling water is lower than a predetermined temperature, the control unit 50 may switch the flow path through which the hot water flows so that the hot water flows through the first flow path 6.

Further, the control unit 50 adjusts the opening degree of the first valve 51 and the second valve 52 according to the temperature of the cooling water, so that the flow rate of the hot water flowing through the first flow path 6 and the second flow path 7 The flow rate of the hot water flowing through the water, or the flow rate ratio of each flow rate may be adjusted. In this case, a valve with a flow rate adjusting function can be used as the first valve 51 and the second valve 52. The first valve 51 and the second valve 52 may be an electromagnetic proportional flow rate control valve, or may be a mass flow controller. When the water temperature of the cooling water is lower than the predetermined target temperature, the control unit 50 may control so that the larger the difference from the target temperature, the higher the ratio of the hot water flowing through the first flow path 6.

FIG. 3 is a diagram showing an example of a flow path in the case where heat exchange is not performed between the hot water flow path and the cooling water flow path in the first operation mode of the adsorption type refrigerator shown in FIG. FIG. 4 is a diagram showing an example of a flow path in the case where heat exchange is not performed between the hot water flow path and the cooling water flow path in the second operation mode of the adsorption type refrigerator shown in FIG.

As shown in FIGS. 3 and 4, in one example, the control unit 50 has a path through which the hot water flows so that the hot water flows through either the first flow path 6 or the second flow path 7 according to the water temperature of the cooling water. To switch. The control unit 50 does not need to raise the temperature of the cooling water when the temperature of the cooling water is within a predetermined temperature range. Therefore, when the water temperature of the cooling water is included in the predetermined temperature range, the control unit 50 may switch the flow path through which the hot water flows so that the hot water flows through the second flow path 7.

In the example shown in FIGS. 1 to 4, the cooling water flow path passes through the heat exchanger 40, and the hot water flow path bypasses the first flow path 6 passing through the heat exchanger 40 and the heat exchanger 40. The case of branching to the road 7 was shown. However, the hot water flow path may pass through the heat exchanger 40, and the cold water flow path may be branched into a first flow path and a second flow path. In this case, the control unit 50 controls the flow rate of the cooling water flowing through the first path. In one example, the control unit 50 switches the path through which the cooling water flows so that the cooling water flows through either the first path or the second path. Specifically, when the water temperature of the cooling water is lower than a predetermined temperature, the control unit 50 switches the path through which the cooling water flows so that the cooling water flows through the first path.

FIG. 5 is an example of an adsorption isotherm of an adsorbent. In FIG. 5, the horizontal axis represents the relative pressure. The vertical axis shows the amount of adsorption. The relative pressure on the horizontal axis is represented by the equilibrium pressure / saturated vapor pressure. Considering that the point A in FIG. 5 corresponds to the equilibrium point of the desorption reaction and the point B corresponds to the equilibrium point of the adsorption reaction, the region between the points A and B is the working pressure range. Then, the difference between the adsorption amount corresponding to the point A and the adsorption amount corresponding to the point B is the water transfer amount (refrigerant transfer amount).

The amount of water transfer means the amount of water transfer in one cycle of adsorption and desorption. The larger the amount of water transferred, the higher the cooling performance of the adsorption refrigerator. According to the absorbent material containing the porous body of this example and the composite salt contained in the porous body, as shown in FIG. 3, the amount of absorption rapidly increases in the working pressure range, so that the amount of water transfer can be increased. Can be made larger.

The position of point A, which is the lower limit of the operating pressure range, is determined by the temperature of the adsorbents 12 and 13 in the desorption step, that is, the temperature of the hot water flowing through the adsorbers 10 and 11 on which the adsorbents 12 and 13 are installed. To. The position of point B, which is the upper limit of the operating pressure range, is determined by the temperature of the adsorbents 12 and 13 in the adsorption process, that is, the temperature of the cooling water flowing through the adsorbers 10 and 11 on which the adsorbents 12 and 13 are installed. Will be done. When the cooling water temperature drops, the upper limit of the working pressure range changes from B to B'. Here, if the relative pressure becomes too large, there is a problem that the salts in the adsorbents 12 and 13 are deliquescent to become an aqueous solution. Depending on the ambient temperature, such as in winter, the temperature of the cooling water may become too low, causing problems due to salt deliquescent. On the other hand, as the cooling water temperature rises, the amount of adsorption decreases.

According to the adsorption type chiller 1 of the present embodiment, the heat exchanger 40 for exchanging heat between the hot water flow path and the cooling water flow path is provided so that the temperature of the cooling water is within a predetermined temperature range. It is possible to prevent the temperature of the cooling water from becoming too low, and prevent the salts in the adsorbents 12 and 13 from deliquescent into an aqueous solution. Therefore, a stable cooling output can be realized.

In particular, since at least one of the hot water flow path and the cooling water flow path is branched into a first flow path 6 passing through the heat exchanger 40 and a second flow path 7 bypassing the heat exchanger 40, the control unit 50 , The flow rate of hot water or cooling water passing through the heat exchanger 40 can be easily controlled, and the temperature of the cooling water can be controlled with high accuracy. The control unit 50 switches the flow path through which the hot water flows so that the hot water flows through either the first flow path 6 or the second flow path 7 according to the water temperature of the cooling water, thereby exchanging heat from a state where heat exchange is not performed. You can quickly switch to the state of

FIG. 6 is a flowchart showing an example of processing of the adsorption refrigerator 1. The control unit 50 acquires the temperature information of the cooling water from the temperature sensor 18 that measures the temperature of the cooling water. The control unit 50 determines whether or not the temperature of the cooling water is lower than the target temperature (step S101). The target temperature may be a predetermined temperature. In one example, the target temperature of the cooling water may be selected from the range of 7 ° C. or higher and 40 ° C. according to the characteristics of the adsorbents 12 and 13. In one example, the target temperature of the cooling water may be any temperature of 10 ° C. or higher and 20 ° C. or lower.

When the temperature of the cooling water is lower than the target temperature (step S101: YES), the control unit 50 switches the path through which the hot water flows so that the hot water flows through the first flow path 6 passing through the heat exchanger 40 (step S101: YES). Step S102). The control unit 50 opens the first valve 51 and the third valve 53 provided in the first flow path 6, and closes the second valve 52 provided in the second flow path 7. On the other hand, when the temperature of the cooling water is equal to or higher than the target temperature (step S101: NO), the path through which the hot water flows is switched so that the hot water flows through the second flow path 7 bypassing the heat exchanger 40 (step). S103). As a result, when the temperature of the cooling water is equal to or higher than the target temperature, heat exchange between the hot water flow path and the cooling water flow path is not performed, so that the temperature of the cooling water is maintained. Therefore, it is possible to prevent the amount of refrigerant adsorbed in the adsorption stage from decreasing due to the increase in the temperature of the cooling water. This prevents the cooling performance from deteriorating.

FIG. 7 is a flowchart showing another example of the processing of the adsorption refrigerator 1. The control unit 50 acquires the temperature information of the cooling water from the temperature sensor 18 that measures the temperature of the cooling water. The control unit 50 determines whether or not the temperature of the cooling water is lower than the target temperature (step S201). When the temperature of the cooling water is lower than the target temperature (step S201: YES), the control unit 50 makes a first flow so that the lower the temperature of the cooling water, the higher the ratio of the hot water flowing through the first flow path 6. The flow rate of the path 6 and the flow rate of the flow path of the second flow path 7 are calculated (step S202).

A look-up table or the like showing the relationship between the flow rate (flow rate ratio) of hot water in the first flow path 6 and the second flow path 7 and the temperature of cooling water may be stored in advance in the memory in the control unit 50. The control unit 50 may calculate the flow rate (flow rate ratio) according to the temperature of the cooling water with reference to the look-up table.

The control unit 50 adjusts the flow rate of the first flow path and the flow rate of the second flow path so as to obtain each calculated flow rate (flow rate ratio) (step S203). Specifically, the control unit 50 adjusts the opening degrees of the first valve 51 and the third valve 53 provided in the first flow path 6, and also adjusts the opening degree of the second valve 52 provided in the second flow path 7. The opening degree may be adjusted.

On the other hand, when the temperature of the cooling water is equal to or higher than the target temperature (step S201: NO), the flow path through which the hot water flows is switched so that the hot water flows through the second flow path 7 bypassing the heat exchanger 40 (step S201: NO). Step S204).

According to the process shown in FIG. 7, the flow rate of the first flow path and the flow rate of the second flow path can be controlled stepwise according to the temperature of the cooling water. Therefore, it is possible to control the temperature of the cooling water with high accuracy.

FIG. 8 is a flowchart showing another example of the processing of the adsorption refrigerator 1. The control unit 50 may control the flow rate of hot water flowing through the first flow path according to the switching timing between the first operation mode and the second operation mode. The control unit 50 determines whether the operation mode switching timing of the pair of adsorbers 10 and 11 is set (step S301). The control unit 50 waits for the operation mode switching timing of the pair of adsorbers 10 and 11 (step S301: YES), and executes the processes from step S302 to step S304. The processing of steps S302 to S304 is the same as that of steps S101 to S103 of FIG. Therefore, the repeated description will be omitted.

At the timing of switching the operation mode, the cooling water will be distributed to one adsorber where the hot water has been distributed until now, and the hot water will be distributed to the other adsorber where the cooling water has been distributed until now. Become. Therefore, the temperature of the cooling water may change at the timing of switching the operation mode. According to the process of FIG. 8, since the flow rate of the hot water flowing through the first flow path is controlled according to the switching timing of the operation mode, it is easy to respond to the change in the temperature of the cooling water due to the switching of the operation mode.

FIG. 9 is a diagram showing an example of an adsorption refrigerator according to the second embodiment of the present invention. The adsorption type refrigerator 1 of the present embodiment includes a temperature setting unit 60. The temperature setting unit 60 may be provided as a function of the computer. The temperature setting unit 60 sets a predetermined temperature range so that the temperature of the cooling water becomes lower according to the deterioration of the pair of adsorbers 10 and 11. The temperature setting unit 60 may determine the degree of deterioration of the pair of adsorbers 10 and 11 based on the temperature and flow rate of the cold water 21 cooled by the generation of heat of vaporization in the evaporation unit 20. The temperature setting unit 60 may set a target temperature of the cooling water based on the temperature and the flow rate of the cold water 21 cooled by the generation of the heat of vaporization in the evaporation unit 20. A temperature sensor 19 may be provided to acquire the temperature information of the cold water 21. A flow meter 41 for acquiring information on the flow rate of the cold water 21 may be provided. Other configurations are the same as the configurations of the adsorption refrigerator 1 of the first embodiment shown in FIGS. 1 to 4. Therefore, the repeated description will be omitted.

FIG. 10 is a diagram showing an example of processing of the adsorption type refrigerator 1 shown in FIG. The temperature setting unit 60 acquires the temperature and flow rate of the cold water 21 cooled by the evaporation unit 20 (step S401). In the first operation mode, the first suction device 10 functions as a suction unit. In the first operation mode, the temperature setting unit 60 determines the degree of deterioration of the adsorbent 12 of the first adsorber 10 based on the temperature and flow rate of the cold water 21 cooled by the evaporation unit 20 (step S402). Specifically, as the deterioration of the adsorbent 12 of the first adsorber 10 progresses, it becomes difficult to cool the cold water 21, so that the temperature of the cold water 21 rises. Further, the larger the flow rate of the cold water 21, the more difficult it is to cool the cold water 21. In one example, when the actual temperature of the cold water 21 is higher than the target temperature, and the value obtained by dividing the difference between the measured temperature and the target temperature by the flow rate is higher than a predetermined threshold value, the first It may be determined that the adsorbent 12 of the adsorber 10 has deteriorated.

When the temperature setting unit 60 determines that the adsorbent 12 of the first adsorber 10 has deteriorated (step S402: YES), the temperature setting unit 60 lowers the target temperature range of the cooling water temperature in the first operation mode. Set (step S403). By lowering the temperature of the cooling water, the amount of the refrigerant adsorbed by the adsorbent 12 can be increased. When the temperature setting unit 60 determines that the adsorbent 12 of the first adsorber 10 has not deteriorated (step S402: NO), the temperature setting unit 60 lowers the target temperature range of the cooling water temperature in the first operation mode. Maintain the target temperature range without setting.

When the temperature setting unit 60 determines that the adsorbent 13 of the second adsorber 11 has deteriorated (step S404: YES), the temperature setting unit 60 lowers the target temperature range of the cooling water temperature in the second operation mode. Set (step S405). By lowering the temperature of the cooling water, the amount of the refrigerant adsorbed by the adsorbent 13 can be increased. When the temperature setting unit 60 determines that the adsorbent 13 of the second adsorber 11 has not deteriorated (step S404: NO), the temperature setting unit 60 lowers the target temperature range of the cooling water temperature in the second operation mode. Maintain the target temperature range without setting.

According to the processes of steps S402 to S405, the temperature setting unit 60 sets a predetermined temperature range so that the temperature of the cooling water becomes lower according to the deterioration of the pair of adsorbers 10 and 11. Further, even if there is a difference in the degree of deterioration of one adsorber 10 with that of the other adsorber 11, in the temperature setting unit 60, one adsorber 10 is deteriorated from the other adsorber 11. If so, the target temperature range in the first operation mode is set lower than the target temperature range in the second operation mode. As a result, it is possible to correct the difference in the degree of deterioration and realize a stable cooling output.

FIG. 11 is a diagram showing another example of the processing of the adsorption type refrigerator 1 shown in FIG. Step S501, step S502, and step S504 are similar to steps S401, S402, and S403 in FIG. Therefore, the repeated description will be omitted. When the control unit 50 determines that the adsorbent 12 of the first adsorber 10 has deteriorated (step S502: YES), the control unit 50 determines the ratio of hot water passing through the first flow path 6 in the first operation mode. Reduce (step S503). In other words, when the control unit 50 determines that the adsorbent 12 of the first adsorber 10 has deteriorated, the control unit 50 increases the ratio of hot water passing through the second flow path 7 in the first operation mode. ..

When the control unit 50 determines that the adsorbent 13 of the second adsorber 11 has deteriorated (step S504: YES), the control unit 50 determines the ratio of hot water passing through the first flow path 6 in the second operation mode. Reduce (step S505). In other words, when the control unit 50 determines that the adsorbent 12 of the first adsorber 10 has deteriorated, the control unit 50 increases the ratio of hot water passing through the second flow path 7 in the second operation mode. ..

According to the processes of steps S502 to S505, when one adsorber 10 is deteriorated from the other adsorber 11, the control unit 50 flows through the first flow path 6 in the first operation mode. The flow rate of hot water is made smaller than the flow rate of hot water flowing through the first flow path in the second operation mode. When the other adsorber 11 is deteriorated from the one adsorber 10, the control unit 50 sets the flow rate of hot water flowing through the first flow path 6 in the second operation mode in the first operation mode. It should be less than the flow rate of hot water flowing through the first flow path. Even by such a process, it is possible to adjust the difference in the degree of deterioration between the adsorber 10 and the adsorber 11.

FIG. 12 is a diagram showing another example of the processing of the adsorption refrigerator 1 shown in FIG. In this example, the control unit 50 adjusts the time of the first operation mode and the time of the second operation mode based on the degree of deterioration of the first adsorber 10 and the degree of deterioration of the second adsorber 11. .. Step S601, step S602, and step S604 are similar to steps S401, S402, and S404 of FIG. Therefore, the repeated description will be omitted. In one example, when the control unit 50 determines that the adsorbent 12 of the first adsorber 10 has deteriorated (step S602: YES), the control unit 50 lengthens the time of the first operation mode (step S603). When the control unit 50 determines that the adsorbent 13 of the second adsorber 11 has deteriorated (step S604: YES), the control unit 50 lengthens the time of the second operation mode (step S605). When one adsorber 10 is deteriorated from the other adsorber 11, the control unit 50 sets the time of the first operation mode in which one adsorber 10 functions as the adsorber to the other adsorber 11. Make it longer than the time of the second operation mode to function as a suction part. On the contrary, when the other adsorber 11 is deteriorated from the one adsorber 10, the time of the second operation mode in which the other adsorber 11 functions as the adsorber is set, and the one adsorber 10 is used as the adsorber. Make it longer than the time of the first operation mode to function as. Even by such a process, it is possible to adjust the difference in the degree of deterioration between the adsorber 10 and the adsorber 11. In the example shown in FIG. 12, when one adsorber 10 is deteriorated from the other adsorber 11, the time of the first operation mode in which one adsorber 10 functions as a suction unit is set to the time of the other adsorber. The case where the time of the second operation mode in which the vessel 11 functions as the suction unit is longer than the time has been described. However, the adsorption refrigerator 1 of this example is not limited to this case. When one adsorber 10 is deteriorated from the other adsorber 11, the control unit 50 keeps the time of the first operation mode shorter than the time of the second operation mode to maintain the overall cooling capacity. It may be controlled as follows.

FIG. 13 is a diagram showing an example of an adsorption refrigerator according to the third embodiment of the present invention. In the adsorption type chiller 1 shown in FIG. 1, the cooling water discharged from the cooling water generation unit 16 is the cooling water pump 9, the cooling water path 3a, the heat exchanger 40, and the first, as shown in FIG. It circulates through the four-way valve 14, the flow path 4, the first aspirator 10, the second four-way valve 15, the condensing section 30, and the cooling water path 3b, and returns to the cooling water generation section 16. On the other hand, in the adsorption type refrigerator 1 of the present embodiment, as shown in FIG. 13, the cooling water pump 9, the cooling water path 3a, the condensing section 30, the cooling water path 3b, the cooling water path 3c, and the heat exchange It circulates through the vessel 40, the first four-way valve 14, the flow path 4, the first aspirator 10, the second four-way valve 15, and the cooling water path 3d, and returns to the cooling water generation unit 16. These cooling water pump 9, cooling water path 3a, condensing section 30, cooling water path 3b, cooling water path 3c, heat exchanger 40, first four-way valve 14, flow path 4, first adsorber 10, second. The four-way valve 15 and the cooling water path 3d form a cooling water flow path through which the cooling water passes. The adsorption type refrigerator 1 of the present embodiment has the same structure as the adsorption type refrigerator 1 of the first embodiment except for the cooling water flow path. Therefore, the repeated description of the same configuration will be omitted.

According to the present embodiment, the cooling water flow path passes through the heat exchanger 40 after passing through the condensing portion 30 and before passing through the adsorbers 10 and 11. As a result, even when it is necessary to raise the temperature of the cooling water, the cooling water at the temperature before the temperature rise can be input to the condensing unit 30, and the condensation reaction can be performed with high efficiency. As in the case of the first embodiment, the cooling water temperature can be raised to a predetermined target temperature by controlling the flow rate of hot water passing through the first flow path 6.

FIG. 14 is a diagram showing an example of an adsorption refrigerator according to the fourth embodiment of the present invention. The adsorption type refrigerator of this embodiment includes a heat storage unit 42. The heat storage unit 42 temporarily stores heat from hot water flowing through one of the pair of adsorbers 10 and 11. For example, the heat storage unit 42 is filled with a heat storage material that maintains a predetermined temperature, such as a latent heat storage material. Even when the temperature of the hot water in the hot water flow path becomes low, the hot water is raised to the temperature maintained by the heat storage unit 42 by passing through the heat storage unit 42 that maintains the temperature in the heated state. As a result, the hot water can flow into the adsorbents 10 and 11 while maintaining a predetermined temperature. The heat storage unit 42 may be a buffer tank.

The heat exchanger 40 exchanges heat between the hot water flow path and the cooling water flow path in the heat storage unit 42. As shown in FIG. 14, the hot water obtained from the hot water main pipe 17 passes through the heat storage section 42 via the hot water path 2a and the hot water pump 8. The hot water that has passed through the heat storage section 42 flows through the first four-way valve 14, the distribution path 5, the second adsorber 11, and the second four-way valve 15 and is discharged to the hot water main pipe 17.

In this example, in the first operation mode, the cooling water generated by the cooling water generation unit 16 may flow through the cooling water pump 9 and the cooling water path 3a as shown in FIG. The outlet side of the cooling water path 3a branches into a first flow path 6 and a second flow path 7. The first flow path 6 is a flow path through the heat exchanger 40, so to speak, a bypass flow path. The second flow path 7 is a path that bypasses the heat exchanger 40. A first valve 51 is provided on the input side of the heat exchanger 40 in the first flow path 6. A third valve 53 is provided on the output side of the heat exchanger 40 in the first flow path 6. A second valve 52 is provided in the second flow path 7. In the example shown in FIG. 14, the first valve 51 and the third valve 53 are open and the second valve 52 is closed. Therefore, the cooling water flows through the first flow path 6. As a result, the heat exchanger 40 exchanges heat between the hot water flow path and the cooling water flow path. The temperature of the cooling water is raised by heat exchange. When the temperature of the cooling water is lower than the target temperature range, the control unit 50 opens the first valve 51 and the third valve 53 and closes the second valve 52, so that the cooling water becomes the heat exchanger 40. The flow path of the cooling water can be switched so as to pass through. On the other hand, when the temperature of the cooling water is equal to or higher than the target temperature range, the control unit 50 closes the first valve 51 and the third valve 53 and opens the second valve 52 to heat the cooling water. The flow path of the cooling water can be switched so as not to pass through the exchanger 40. Other configurations are the same as in the case of the first embodiment. Therefore, the repeated description will be omitted.

According to the adsorption type refrigerator 1 of the present embodiment, even when the temperature of the exhaust hot water flowing through the hot water main pipe 17 fluctuates, the temperature fluctuation of the hot water can be suppressed by the heat storage unit 42. Since heat exchange can be performed between the hot water flow path through which the hot water in which the temperature fluctuation is suppressed flows and the cooling water flow path, the temperature of the cooling water can be controlled stably.

FIG. 15 is a diagram showing an example of an adsorption refrigerator according to the fifth embodiment of the present invention. The adsorption type refrigerator of this embodiment includes a heat storage unit 42. In the fourth embodiment shown in FIG. 14, the hot water obtained from the hot water main pipe 17 passes through the heat storage section 42 via the hot water path 2a and the hot water pump 8, and is input to the first four-way valve 14. It was. On the other hand, in the adsorption type refrigerator 1 of the present embodiment, the hot water main pipe 17 itself passes through the heat storage unit 42. In other words, the heat storage unit 42 comes into direct contact with the hot water main pipe 17 (hot water line), which is a heat source. The hot water path 2a acquires hot water from the hot water main pipe 17 at a position different from that of the heat storage unit 42.

In this example, the hot water is hot water main pipe 17, heat storage part 42, hot water main pipe 17, hot water path 2a, hot water pump 8, first four-way valve 14, distribution path 5, second adsorber 11, second four-way valve 15. , And the hot water main pipe 17. The hot water main pipe 17, the heat storage section 42, the hot water path 2a, the hot water pump 8, the first four-way valve 14, the distribution path 5, the second adsorber 11, and the second four-way valve 15 form a hot water flow path.

Even when the temperature of the exhaust hot water flowing through the hot water main pipe 17 fluctuates, the heat storage unit 42 can suppress the temperature fluctuation of the hot water even by the adsorption type refrigerator 1 of the present embodiment. Since heat exchange can be performed between the hot water flow path through which the hot water in which the temperature fluctuation is suppressed flows and the cooling water flow path, the temperature of the cooling water can be controlled stably.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. It is clear from the description of the claims that the form with such changes or improvements may be included in the technical scope of the present invention.

The order of execution of each process such as operation, procedure, step, and step in the device, system, program, and method shown in the claims, specification, and drawings is particularly "before" and "prior to". It should be noted that it can be realized in any order unless the output of the previous process is used in the subsequent process. Even if the scope of claims, the specification, and the operation flow in the drawings are explained using "first," "next," etc. for convenience, it means that it is essential to carry out in this order. It's not a thing.

1 ... Adsorption type refrigerator, 2 ... Hot water route, 3 ... Cooling water route, 4 ... Distribution route, 5 ... Distribution route, 6 ... 1st flow path, 7 ... 2nd flow path, 8・ ・ Hot water pump, 9 ・ ・ Cooling water pump, 10 ・ ・ Adsorber, 11 ・ ・ Adsorber, 12 ・ ・ Adsorbent, 13 ・ ・ Adsorbent, 14 ・ ・ 1st four-way valve, 15 ・ ・ No. 2 Four-way valve, 16 ... Cooling water generator, 17 ... Hot water main pipe, 18 ... Temperature sensor, 19 ... Temperature sensor, 20 ... Evaporation part, 21 ... Cold water, 30 ... Condensing part, 40 ... Heat exchanger, 41 ... Flow meter, 42 ... Heat storage unit, 50 ... Control unit, 51 ... 1st valve, 52 ... 2nd valve, 53 ... 3rd valve, 60 ... Temperature setting unit

Claims (13)

The evaporation part that evaporates the refrigerant and
A pair of adsorbers provided inside with adsorbents capable of adsorbing and desorbing the refrigerant according to the temperature, and
A condensing part that cools and condenses the refrigerant,
A hot water flow path through which hot water flowing through one of the pair of adsorbers passes,
A cooling water flow path through which the cooling water flowing through the other of the pair of adsorbers passes,
A heat exchanger for exchanging heat between the hot water flow path and the cooling water flow path so that the temperature of the cooling water falls within a predetermined temperature range is provided.
Adsorption type refrigerator. At least one of the hot water flow path and the cooling water flow path is branched into a first flow path that passes through the heat exchanger and a second flow path that bypasses the heat exchanger.
A control unit for controlling the flow rate of the hot water or cooling water flowing through the first flow path is provided.
The adsorption refrigerator according to claim 1. The hot water flow path passes through the heat exchanger after passing through one of the pair of adsorbers.
The adsorption refrigerator according to claim 1 or 2. The control unit switches the flow path through which the hot water flows so that the hot water flows through either the first flow path or the second flow path according to the water temperature of the cooling water.
The adsorption refrigerator according to claim 2. When the temperature of the cooling water is lower than a predetermined temperature, the control unit switches the flow path through which the hot water flows so that the hot water flows through the first flow path.
The adsorption refrigerator according to claim 4. The cooling water flow path passes through the heat exchanger after passing through the condensing portion and before passing through the other of the pair of adsorbers.
The adsorption refrigerator according to any one of claims 1 to 5. The adsorption type refrigerating machine has a first operation mode in which one of the adsorbers functions as an adsorbing unit on which the refrigerant adsorbs and the other adsorber functions as a desorbing unit on which the adsorbent desorbs in the pair of adsorbers. It is operated so that the second operation mode in which one of the adsorbers functions as a desorption portion for the adsorbent to be desorbed and the other adsorber functions as a adsorbent for adsorbing the adsorbent can be alternately switched.
The adsorbent provided in the adsorption unit adsorbs the refrigerant evaporated by the evaporation unit, and the adsorbent is adsorbed.
The refrigerant is desorbed from the adsorbent provided in the desorption portion, and the refrigerant is desorbed.
The desorbed refrigerant is condensed by the condensing portion, and the desorbed refrigerant is condensed.
The evaporating part evaporates the refrigerant condensed by the condensing part,
The control unit controls the flow rate of the hot water flowing through the first flow path according to the switching timing between the first operation mode and the second operation mode.
The adsorption refrigerator according to claim 2. When the one adsorber is deteriorated from the other adsorber, the temperature setting unit for lowering the temperature range in the first operation mode to lower than the temperature range in the second operation mode. Prepare, prepare
The adsorption refrigerator according to claim 7. When the one adsorber is deteriorated from the other adsorber, the control unit sets the flow rate of the hot water flowing through the first flow path in the first operation mode to the second operation. Less than the flow rate of the hot water flowing through the first flow path in the mode.
The adsorption refrigerator according to claim 8. A temperature setting unit for setting a predetermined temperature range so that the temperature of the cooling water becomes lower according to the deterioration of the pair of adsorbers is provided.
The adsorption refrigerator according to any one of claims 1 to 9. The adsorption type refrigerating machine has a first operation mode in which one of the adsorbers functions as an adsorbing unit on which the refrigerant adsorbs and the other adsorber functions as a desorbing unit on which the adsorbent desorbs in the pair of adsorbers. It is operated so that the second operation mode in which one of the adsorbers functions as a desorption portion for the adsorbent to be desorbed and the other adsorber functions as a adsorbent for adsorbing the adsorbent can be alternately switched.
The adsorbent provided in the adsorption unit adsorbs the refrigerant evaporated by the evaporation unit, and the adsorbent is adsorbed.
The refrigerant is desorbed from the adsorbent provided in the desorption portion, and the refrigerant is desorbed.
The desorbed refrigerant is condensed by the condensing portion, and the desorbed refrigerant is condensed.
The evaporating part evaporates the refrigerant condensed by the condensing part,
The adsorption type refrigerator adjusts the time of the first operation mode and the time of the second operation mode based on the degree of deterioration of the one adsorber and the degree of deterioration of the other adsorber.
The adsorption refrigerator according to claim 2. It has a heat storage unit that temporarily stores the heat of hot water flowing through one of the pair of adsorbers.
The heat exchanger exchanges heat between the hot water flow path and the cooling water flow path in the heat storage unit.
The adsorption refrigerator according to any one of claims 1 to 11. The hot water flow path obtains the hot water from a heat source and obtains the hot water.
The heat storage unit is in contact with the heat source.
The adsorption refrigerator according to claim 12.

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