JP6555710B2 - Refrigeration / refrigeration system - Google Patents

Description

  The present invention relates to a refrigeration / refrigeration system, and is particularly useful when applied to a showcase or a refrigerator having an air circulation path for circulating cold air generated by heat exchange with an evaporator.

In the showcase for freezing and refrigeration, frost adheres to the surface of the evaporator that generates cold air for freezing and refrigeration, and therefore, a defrosting operation that periodically melts the frost is necessary. In this case, in the prior art, a defrost method using air heated by a heater is the mainstream, and a drain pan, an automatic evaporation promotion filter, and a fan are installed for the post-treatment of the defrost water.
However, in such a heater heating type defrosting method, problems such as an increase in power consumption due to the heater defrosting and an increase in temperature in the showcase during defrosting have been pointed out. There is also a problem that the defrosting water overflows from the drain pan because the post-treatment is not in time.

  On the other hand, as another prior art of this type, a patent relating to a non-frost-freezing refrigeration apparatus using a desiccant (adsorbent) rotor has been filed and known (see Patent Document 1). While rotating the desiccant rotor, in the freezer, supplying air dehumidified by the desiccant rotor to the evaporator arranged in the leeway, preventing frost formation on the evaporator, and outside the freezer, By supplying dry air to the desiccant rotor by exhaust heat from the condenser arranged on the windward side, the adsorbent that has absorbed moisture is dried to regenerate the adsorption capacity.

  However, the desiccant rotor system disclosed in Patent Document 1 requires power for rotating the desiccant rotor, which not only lowers the thermal efficiency but also requires a dedicated area for the desiccant rotor and increases the installation space. To do.

WO 2008/084573

  In view of the above prior art, the present invention can prevent the formation of drain by dehumidifying the air supplied to the evaporator with the adsorbent application heat exchanger in advance, and can perform high-efficiency operation. An object of the present invention is to provide a refrigeration / refrigeration system that can be used.

The first aspect of the present invention for achieving the above object is as follows:
Air having a storage space for storing refrigerated / refrigerated goods in the internal space of the housing, and supplying air cooled by the evaporator to the storage space via a discharge duct and returning to the evaporator via a suction duct A refrigeration / refrigeration system comprising a circulation path and a refrigerant circulation path for circulating a refrigerant between predetermined devices including an evaporator,
An adsorbent application heat exchanger with an adsorbent disposed on the upstream side of the evaporator in the air circulation path;
An expansion valve disposed between the adsorbent application heat exchanger and the evaporator on the upstream side in the refrigerant circuit;
A heater disposed on the upstream side of the adsorbent application heat exchanger in the air circulation path,
In the adsorption operation mode in which the adsorbent application heat exchanger adsorbs moisture in the air, the refrigerant is supplied from the compressor to the condenser, another expansion valve, and the adsorbent application heat exchanger. While forming the refrigerant circulation path that returns to the condenser via the expansion valve and the evaporator, and the air forms an air circulation path that exchanges heat with the evaporator via the adsorbent application heat exchanger,
In the desorption operation mode, which is an operation mode for desorbing the adsorbed moisture, control is performed so that air heated by a heater is supplied to the adsorbent application heat exchanger and the adsorbent application heat exchanger is desorbed. It is in a refrigeration system that is characterized by

  According to this aspect, in the adsorption operation mode, the adsorbent application heat exchanger is cooled by the refrigerant while absorbing moisture. As a result, the adsorption capacity of the adsorbent is not lowered as in the conventional desiccant rotor. Furthermore, by controlling the temperature of the refrigerant flowing into the adsorbent application heat exchanger, the adsorption speed and the operation time in the adsorption operation mode can be controlled.

  On the other hand, the desorption operation mode is performed by supplying air heated by a heater to the evaporator. As a result, there is no rotating part such as a bearing as in the desiccant rotor system, and it is not necessary to consider the wear of the part.

The second aspect of the present invention is:
Air having a storage space for storing refrigerated / refrigerated goods in the internal space of the housing, and supplying air cooled by the evaporator to the storage space via a discharge duct and returning to the evaporator via a suction duct A refrigeration / refrigeration system comprising a circulation path and a refrigerant circulation path for circulating a refrigerant between predetermined devices including an evaporator,
An adsorbent application heat exchanger with an adsorbent disposed on the upstream side of the evaporator in the air circulation path;
Another evaporator disposed in the refrigerant circuit,
Between the compressors and coagulation condenser, a first valve disposed in the refrigerant circulation path,
A second valve disposed in the refrigerant circuit between the compressor and the adsorbent application heat exchanger;
Between the adsorbent application heat exchanger and the other evaporator, and having another expansion valve disposed in the refrigerant circuit,
In the adsorption operation mode in which the adsorbent application heat exchanger adsorbs moisture in the air, the first valve is opened, the second valve is closed, and the refrigerant is compressed. Forming a refrigerant circulation path from the machine to the compressor via the condenser, expansion valve, and evaporator,
In the desorption operation mode, which is the operation mode for desorbing the adsorbed moisture, the first valve is closed, the second valve is opened, and the refrigerant is supplied from the compressor to the adsorbent application heat exchanger, A refrigeration / refrigeration system that controls the adsorbent application heat exchanger to function as a condenser by forming a refrigerant circulation path that returns to the compressor via another expansion valve and the other evaporator. It is in.

  According to this aspect, the air is cooled by the evaporator by opening the first valve and closing the second valve in the adsorption operation mode. Since this air is dehumidified by the adsorbent application heat exchanger, frost formation in the evaporator can be effectively prevented.

  In the desorption operation mode, the first valve is closed, the second valve is opened, and the other expansion valves and the other evaporators are respectively functioned in a predetermined manner so that the adsorbent application heat exchanger is It functions as a condenser. The adsorbent application heat exchanger is desorbed by the condensation heat of the condenser.

The third aspect is
Air having a storage space for storing refrigerated / refrigerated goods in the internal space of the housing, and supplying air cooled by the evaporator to the storage space via a discharge duct and returning to the evaporator via a suction duct A refrigeration / refrigeration system comprising a circulation path and a refrigerant circulation path for circulating a refrigerant between predetermined devices including the evaporator,
A first adsorbent application heat exchanger with an adsorbent disposed on the upstream side of the evaporator in the air circulation path;
And having a second adsorbent application heat exchanger,
In the adsorption operation mode, which is an operation mode in which the adsorbent application heat exchanger adsorbs moisture in the air, after the air in the air circulation path has circulated through the first adsorbent application heat exchanger, While being supplied to the evaporator, the second adsorbent application heat exchanger is supplied with air heated by the condensation heat of the condenser in the refrigerant circuit,
In the desorption operation mode, which is an operation mode for desorbing the adsorbed moisture, air heated by the condensation heat of the condenser is supplied to the first adsorbent application heat exchanger and the second adsorption In the refrigeration / refrigeration system, the material application heat exchanger is controlled to supply air branched from the air circulation path, and then return the air to the air circulation path and supply the air to the evaporator. is there.

  According to this aspect, in the adsorption operation mode, the air dehumidified by the first adsorbent application heat exchanger is supplied to the cooler. As a result, frost formation on the cooler can be effectively prevented. At the same time, the second adsorbent application heat exchanger is supplied with air heated by the condensation heat of the condenser. As a result, the second adsorbent application heat exchanger enters the desorption mode, and the adhering moisture is removed.

  In the desorption operation mode, air heated by the condensation heat of the condenser is supplied to the first adsorbent application heat exchanger. As a result, the first adsorbent application heat exchanger enters the desorption mode and the adhering moisture is removed. At the same time, the air dehumidified by the second adsorbent application heat exchanger is supplied to the evaporator. As a result, the circulation of the cooling air through the air circulation path can be continued without interruption while effectively preventing frosting of the evaporator.

The fourth aspect is
Air having a storage space for storing refrigerated / refrigerated goods in the internal space of the housing, and supplying air cooled by the evaporator to the storage space via a discharge duct and returning to the evaporator via a suction duct A refrigeration / refrigeration system comprising a circulation path and a refrigerant circulation path for circulating a refrigerant between predetermined devices including the evaporator,
First and second adsorbent application heat exchangers disposed in the air circulation path together with the refrigerant circulation path;
Arranged in the refrigerant circuit to selectively supply the refrigerant discharged from the compressor disposed in the refrigerant circuit to one of the first and second adsorbent application heat exchangers by switching modes. And has a four-way valve installed,
In the adsorption operation mode, which is an operation mode in which the adsorbent application heat exchanger adsorbs moisture in the air, the second adsorbent application heat exchanger functions as a condenser and the first adsorption. While the material application heat exchanger functions as an evaporator,
In the desorption operation mode, which is an operation mode for desorbing the adsorbed moisture, the first adsorbent application heat exchanger functions as a condenser and the second adsorbent application heat exchanger functions as an evaporator. In the refrigeration / refrigeration system, the four-way valve is controlled to be switched.

According to this aspect, in the adsorption operation mode, the first adsorbent application heat exchanger functions as an evaporator and the second adsorbent application heat exchanger functions as a condenser. On the other hand, in the desorption operation mode, the first adsorbent application heat exchanger functions as a condenser and the second adsorbent application heat exchanger functions as an evaporator. As a result, the first or second adsorbent application heat exchanger is alternately functioned as an evaporator, whereby the second or first adsorbent application heat exchanger is continuously circulated through the air circulation path. Predetermined desorption can also be performed by alternately functioning as a condenser.

  According to the present invention, the adsorbent application heat exchanger is disposed upstream of the evaporator in the air circulation path to dehumidify the air supplied to the evaporator, thereby preventing frost formation in the evaporator. Thus, the generation of the drain can be eliminated. Moreover, since there is no rotating part for dehumidification, such as a desiccant rotor, a highly efficient driving | operation can be performed.

It is a block diagram which shows the freezing / refrigeration system which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the aspect of the 1st control of the freezing / refrigeration system which concerns on the 1st Embodiment of this invention. 3 is a flowchart of the control shown in FIG. It is explanatory drawing which shows the aspect of the 2nd control of the freezing / refrigeration system which concerns on the 1st Embodiment of this invention. 5 is a flowchart of control shown in FIG. It is explanatory drawing which shows the aspect of the 3rd control of the freezing / refrigeration system which concerns on the 1st Embodiment of this invention. It is a flowchart of the control shown in FIG. It is a block diagram which shows the freezing / refrigeration system which concerns on the 2nd Embodiment of this invention. Is a block diagram showing a refrigerated system according to the third embodiment (aspect). Is an explanatory view showing an aspect of a control of the refrigerated system according to the third embodiment (aspect). It is a flowchart of the control shown in FIG. Is a block diagram showing a refrigerated system according to the fourth embodiment (embodiment). Is an explanatory view showing an aspect of a control of the refrigerated system according to the fourth embodiment (embodiment).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each embodiment, the same parts are denoted by the same reference numerals, and redundant description is omitted.

<First Embodiment>
FIG. 1 is a block diagram showing a refrigeration / refrigeration system according to a first embodiment of the present invention. As shown in the figure, the housing I has a storage space 100 for frozen / refrigerated products formed by partitioning the internal space with a U-shaped partition plate, and after freezing / cooling the frozen / refrigerated products. A suction duct 200 serving as an air passage, a discharge duct 300 serving as an air passage for freezing / cooling refrigerated / refrigerated goods, and a device installation space 400 communicating with the suction duct 200 and the discharge duct 300 are provided. Yes. In the device installation space 400, the evaporator 3 is installed.

  That is, the refrigeration / refrigeration system according to the present invention has the storage space 100 in the internal space of the housing I, supplies air cooled by the evaporator 3 to the storage space 100 via the discharge duct 300, and suction duct. An air circulation path that is returned to the evaporator 3 via 200 and a refrigerant circulation path that circulates refrigerant between predetermined devices of the refrigeration cycle including the evaporator 3 are provided. This point is a component common to the embodiments.

  In the present embodiment, an adsorbent application heat exchanger 1 with an adsorbent is disposed on the upstream side of the evaporator 3 in the air circulation path, and further, the adsorbent application heat exchanger 1 and the evaporator on the upstream side in the refrigerant circulation path. The expansion valve 2 is disposed between the two. A heater 10 is disposed on the upstream side of the adsorbent application heat exchanger 1 in the air circulation path. In this embodiment, the adsorbent application heat exchanger 1, the expansion valve 2, the evaporator 3 and the heater 10 are installed in the device installation space 400 of the casing I. However, even if these are installed outside the casing I, I do not care. What is necessary is just to be a structure which can supply the air cooled with the evaporator 3 into the housing | casing I through the duct which forms a part of air circulation path.

  Furthermore, in the refrigeration / refrigeration system according to the present embodiment, in the adsorption operation mode (hereinafter simply referred to as adsorption operation mode) in which the adsorbent application heat exchanger 1 adsorbs moisture in the air, the refrigerant is A refrigerant circulation path is formed from the compressor 5 through the condenser 6, another expansion valve 8, the adsorbent application heat exchanger 1, the expansion valve 2, and the evaporator 3 to the compressor 5, and air is applied to the adsorbent. An air circulation path for exchanging heat with the evaporator 3 through the heat exchanger 1 is formed.

  On the other hand, in a desorption operation mode (hereinafter simply referred to as a desorption operation mode), which is an operation mode for desorbing the adsorbed moisture, air heated by the heater 10 is supplied to the adsorbent application heat exchanger 1 to adsorb the adsorbent. The application heat exchanger 1 is desorbed.

  For this reason, dampers 41 and 42 are provided below the middle portion of the side wall of the casing I corresponding to the heater 10 and the outlet of the adsorbent application heat exchanger 1 and the inlet of the evaporator 3 on the bottom plate of the casing I. It is. Fans 50, 51, and 52 are disposed at the outlet of the evaporator 3, below the damper 42 outside the casing I, and at the outlet of the condenser 6, respectively.

  In the refrigeration / refrigeration system according to the present embodiment, in the adsorption / refrigeration / refrigeration operation mode, as shown in FIG. 1 (a), the circulating air RA in the storage space 100 that has passed through the suction duct 200 is used as an adsorbent-coated heat exchanger. 1 is dehumidified and supplied to the evaporator 3. As a result, frosting of the evaporator 3 can be prevented. On the other hand, in the refrigerant circuit, the high-temperature and high-pressure refrigerant discharged from the compressor 5 sequentially passes through the condenser 6, the other expansion valve 8, the adsorbent application heat exchanger 1, the expansion valve 2, and the evaporator 3. Return to the compressor 5 again. Here, since the adsorbent application heat exchanger 1 is cooled by the refrigerant while adsorbing moisture in the circulating air RA, the adsorption capacity of the adsorbent is prevented from being reduced by absorbing the adsorption heat as in a conventional desiccant rotor. Can do. Further, by controlling the temperature of the refrigerant flowing into the adsorbent application heat exchanger 1, the adsorption speed and the operation time in the adsorption / freezing / refrigeration mode can be controlled. In this mode, the dampers 41 and 42 are both closed.

  In the desorption operation mode in the present embodiment, as shown in FIG. 1B, the circulation of the refrigerant in the refrigerant circuit is stopped. In this state, the dampers 41 and 42 are opened to drive the fan 52, and at the same time, the heater 10 is energized. As a result, the outside air OA is warmed by the heater 10, the adsorbent application heat exchanger 1 is regenerated (desorbed), and then exhausted EA.

Here, the power consumption W _de-heater of the heater 10 for desorption is the same as the desorption heat amount Q _de .

  In this embodiment, the adsorption / freezing / refrigeration operation mode of FIG. 1A and the desorption operation mode of FIG. 1B are repeated.

  According to this embodiment, since the adsorbent application heat exchanger 1 is desorbed by the heater 10, there is an advantage that drainless and post-treatment of defrosted water is not necessary.

  Next, a control method that can be suitably applied to this embodiment will be described. The control in this embodiment includes 1) control using an air dew point and a timer together (FIGS. 2 and 3), 2) control based on an equilibrium adsorption amount of the adsorbent (FIGS. 4 and 5), and 3) control using a timer (FIG. 6 FIG. 7) can be considered.

1) Control using air dew point and timer in combination In this case, a part of the refrigeration / refrigeration system is extracted, and the outline of the control is shown in FIG. 2 (a) (adsorption operation mode) and FIG. 2 (b) (desorption operation mode). . A flowchart of the control is shown in FIG.

As shown in these figures, the air dew point DP detected by the air dew point sensor 60 installed in the air inlet side flow path of the evaporator 3 and the refrigerant temperature sensor 61 installed in the outlet refrigerant pipe of the evaporator 3 are detected. The refrigerant temperature T ₁ and the outside air temperature T ₂ detected by the air temperature sensor 62 were used as control parameters. Depending on the outside air temperature T _2, determine the desorption operation mode time Δτ _deth. When DP of <T _1, performs a suction-refrigerated mode operation, the value of at the time when a predetermined temperature difference [Delta] T _Adth, completed the adsorption-refrigerated mode operation (T ₁ -DP), desorption Switch to operation mode. When the desorption operation mode time τ _de reaches the predetermined operation time Δτ _deth , the operation is returned to the adsorption / freezing / refrigeration mode operation and the same operation is repeated.

2) Control by equilibrium adsorption amount of adsorbent A part of the refrigeration / refrigeration system in this case is extracted, and the outline of control is shown in FIG. 4 (a) (adsorption operation mode) and FIG. Show. A flowchart of the control is shown in FIG.

As shown in these drawings, control is performed based on air humidity X ₁ and X ₂ detected by a pair of humidity sensors 63 and 64 installed in the air flow path on the inlet side and outlet side of the adsorbent application heat exchanger 1. . When X ₂ <X ₁ , adsorption / freezing / refrigeration mode operation is performed. When the value of (X ₁ −X ₂ ) _{reaches a} predetermined humidity difference Δ _adth , the mode is switched to the desorption mode, and the desorption mode is executed under the condition of X ₂ > X ₁ . When the value of (X ₂ −X ₁ ) reaches a predetermined humidity difference ΔX _deth , the desorption operation mode is terminated, the adsorption / freezing / refrigeration mode operation is _resumed, and the same operation is repeated.

3) Control by timer FIG. 6 (a) (adsorption operation mode) and FIG. 6 (b) (desorption operation mode) show an outline of control by extracting a part of the freezing / refrigeration system in this case. A flowchart of the control is shown in FIG.

As shown in these drawings, the temperature TA ₁ of the circulating air RA in the suction duct 200 is detected by the temperature sensor 66 and the temperature TA ₂ of the outside air OA is detected by the temperature sensor 67, and the temperature TA ₁ and the temperature TA ₂ correspond to each other. Thus, control is performed by managing the set times τ _ad and τ _de based on a predetermined time constant. That is, the adsorption / freezing / refrigeration mode operation is performed at a predetermined set time τ _ad . Next, when the set time τ _ad reaches the predetermined switching time τ _adth , the mode is switched to the desorption operation mode, and the desorption operation mode is executed during the predetermined set time τ _de . Finally, when the set time τ _de reaches the predetermined switching time τ _deth , the operation returns to the adsorption / freezing / refrigeration mode operation and the same operation is repeated.

<Second Embodiment>
FIG. 8 is a block diagram showing a refrigeration / refrigeration system according to a second embodiment of the present invention. As shown in the figure, in this embodiment, another evaporator 11 is disposed outside the casing I in the refrigerant circulation path. In the refrigerant circulation path, a first electromagnetic valve 14 is provided between the compressor 5 and the condenser 6, and a second electromagnetic valve 15 is provided between the compressor 5 and the adsorbent application heat exchanger 1. Each is arranged. Further, another expansion valve 13 is disposed between the adsorbent application heat exchanger 1 and the other evaporator 11 in the refrigerant circuit.

  In the refrigeration / refrigeration system according to the present embodiment, in the adsorption operation mode, the first electromagnetic valve 14 is opened and the second electromagnetic valve 15 is closed, so that the refrigerant flows from the compressor 5 to the condenser 6, the expansion valve 8, A refrigerant circulation path is formed so as to return to the compressor 5 through the evaporator 3.

  On the other hand, in the desorption operation mode, the first electromagnetic valve 14 is closed, the second electromagnetic valve 15 is opened, and the refrigerant flows from the compressor 5 to the adsorbent application heat exchanger 1, the other expansion valve 13, and the like. The refrigerant | coolant circulation path which returns to the compressor 5 through the evaporator 11 of this is formed, and the adsorbent application | coating heat exchanger 1 is functioned as a condenser.

  For this reason, in this embodiment, the fans 53 and 54 are disposed together with the dampers 41 and 42.

  In the refrigeration / refrigeration system according to the present embodiment, in the adsorption / refrigeration / refrigeration operation mode, as shown in FIG. 8 (a), the circulating air RA in the storage space 100 that has passed through the suction duct 200 is used as an adsorbent application heat exchanger. Since it is dehumidified by 1 and supplied to the evaporator 3, frosting of the evaporator 3 is prevented. Here, by opening the first electromagnetic valve 14 and closing the second electromagnetic valve 15, the refrigerant returns from the compressor 5 to the compressor 5 via the condenser 6, the expansion valve 8, and the evaporator 3. Circulate through the refrigerant circuit.

On the other hand, during the desorption operation, as shown in FIG. 8B, the first electromagnetic valve 14 is closed and the second electromagnetic valve 15 is opened. As a result, the refrigerant circulates in the refrigerant circulation path that returns to the compressor 5 through the compressor 5, the adsorbent application heat exchanger 1, and the external evaporator 11. Here, by opening the dampers 41 and 42 and driving the fans 53 and 54, the outside air OA is supplied to the adsorbent application heat exchanger 1. As a result, the outside air OA is warmed by the heat of condensation of the refrigerant, and after the adsorbent application heat exchanger 1 is regenerated (desorbed), it is exhausted EA. At the same time, the evaporator 11 takes heat from the outside air OA and evaporates the refrigerant. As a result, the relationship between the compressor power consumption (W _de-com ) for desorption and the desorption heat amount Q _de is (W _de-com = Q _de / COP _de ). Here, COP _de is the COP (greater than 1) of the heat pump cycle.

Thus, the adsorption / freezing / refrigeration operation mode shown in FIG. 8A and the desorption operation mode shown in FIG. 8B are repeated. According to the present embodiment, since the compressor power consumption (W _de-com ) for desorption is smaller than the desorption heat amount Q _dc , energy is saved compared to the heater desorption of the first embodiment. Further, even in this embodiment, frost-free operation and drainless merit can be obtained.

  The control in this embodiment is the same control method as in the first embodiment, that is, 1) control using an air dew point and a timer in combination (FIGS. 2 and 3), and 2) control by the equilibrium adsorption amount of the adsorbent (FIG. 4). 5), 3) Control by timer (FIGS. 6 and 7) can be applied in exactly the same manner. Therefore, a new description using the drawings is omitted.

<Third Embodiment>
FIG. 9 is a block diagram showing a refrigeration / refrigeration system according to a third embodiment (mode) . As shown in the figure, in this embodiment, an adsorbent application heat exchanger 16 is provided in addition to the adsorbent application heat exchanger 1 with an adsorbent disposed upstream of the evaporator 3 in the air circulation path. Arranged outside the body I.

  Furthermore, in the refrigeration / refrigeration system according to the present embodiment, in the adsorption operation mode (when the adsorbent application heat exchanger 1 is in the adsorption mode; hereinafter the same), the air in the air circulation path is the adsorbent application heat exchanger 1. Is then supplied to the evaporator 3. At the same time, the external adsorbent application heat exchanger 16 is supplied with air heated by the condensation heat of the condenser 6 in the refrigerant circuit.

  In the desorption operation mode (when the adsorbent application heat exchanger 1 is in the desorption mode; the same applies hereinafter), air heated by the condensation heat of the condenser 6 is supplied to the adsorbent application heat exchanger 1. At the same time, air branched from the air circulation path is supplied to the external adsorbent application heat exchanger 16 and then supplied to the evaporator 3 by returning the air to the air circulation path. For this reason, the casing I is provided with a damper 43 in addition to the dampers 41 and 42.

  In the case of the adsorption / refrigeration / refrigeration operation mode in the refrigeration / refrigeration system according to the present embodiment, as shown in FIG. 9 (a), the circulating air RA flowing through the suction duct 200 is dehumidified by the adsorbent application heat exchanger 1, Since it enters the evaporator 3, frosting of the evaporator 3 can be prevented. On the other hand, the outside air OA is heated by the condensation heat of the refrigerant in the condenser 6 and supplied to the external adsorbent application heat exchanger 16 to regenerate (desorb) the adsorbent application heat exchanger 16. Thereafter, exhaust EA is performed. Incidentally, in the case of the conventional system, the air leaving the condenser 6 is exhausted while being warm, which is a cause of a decrease in thermal efficiency.

  In the case of the desorption / freezing / refrigeration operation mode shown in FIG. 9 (b), the dampers 41, 42, 43 are opened so that the circulating air RA that has passed through the suction duct 200 passes through the damper 43 to the external adsorbent application heat. It is supplied to the exchanger 16 and dehumidified, and then supplied to the evaporator 3 via the damper 42. As a result, frosting of the evaporator 3 can be prevented. On the other hand, the outside air OA is heated by the condensation heat of the refrigerant in the condenser 6 and supplied to the adsorbent application heat exchanger 1, and after the adsorbent application heat exchanger 1 is regenerated (desorbed), it is exhausted EA.

Thereafter, each mode of FIG. 9A and FIG. 9B is repeated. In each of these modes, since either the adsorbent application heat exchanger 1 or the adsorbent application heat exchanger 16 is desorbed using the exhaust heat of the condenser 6 while being frozen or refrigerated, consumption for desorption The power W _de-com is zero. Therefore, in this embodiment, energy saving can be realized. Furthermore, the benefits of drainless can be enjoyed. Furthermore, since the circulation of the air for refrigeration / refrigeration in the air circulation path is continued even in the desorption operation, the refrigeration / refrigeration capacity does not decrease even during that time.

Next, a control method that can be suitably applied to this embodiment will be described. In this embodiment, a control method using a timer is suitable. A part of the refrigeration / refrigeration system in this case is extracted and the outline of the control is shown in FIG. 10A (adsorption operation mode) and FIG. 10B (desorption operation mode). A flowchart of the control is shown in FIG. As shown in these figures, the temperature TA ₁ of the circulating air RA in the suction duct 200 is detected by the temperature sensor 66 and the temperature TA ₂ of the outside air OA is detected by the temperature sensor 67, and these temperatures TA ₁ and TA ₂ are made to correspond to each other. Control is performed by managing set times τ ₁ and τ ₂ based on predetermined time constants. That is, the adsorption / freezing / refrigeration operation mode is executed at the predetermined set time τ ₁ . Next, when the set time τ ₁ reaches the predetermined switching time τ _th1 , the mode is switched to the desorption / freezing / refrigeration mode, and the operation of the desorption / freezing / refrigeration mode is executed during the predetermined setting time τ ₂ . Finally, when the set time τ ₂ reaches the predetermined switching time τ _th2 , the mode is returned to the desorption / freezing / refrigeration mode and the same operation is repeated.

<Fourth embodiment>
FIG. 12 is a block diagram showing a refrigeration / refrigeration system according to a fourth embodiment (mode) . As shown in the figure, in this embodiment, the first adsorbent application heat exchanger 23 and the second adsorbent application heat exchanger 24 are disposed in the air circulation path as well as the refrigerant circulation path. The four-way valve 26 is disposed in the refrigerant circulation path so as to selectively supply the refrigerant discharged from the compressor 5 to one of the first and second adsorbent application heat exchangers 23 and 24 by switching the mode. ing.

  Here, in the adsorption operation mode, the second adsorbent application heat exchanger 24 functions as a condenser and the first adsorbent application heat exchanger 23 functions as an evaporator. On the other hand, in the desorption operation mode, the first adsorbent application heat exchanger 23 functions as a condenser and the second adsorbent application heat exchanger 24 functions as an evaporator. Selection of such a function is executed by switching the four-way valve 26.

  In the case of the adsorption / refrigeration / refrigeration operation mode in the adsorption / refrigeration / refrigeration operation in the refrigeration / refrigeration system according to this embodiment, as shown in FIG. 12 (a), the adsorbent application heat exchanger 23 functions as an evaporator, The adsorbent application heat exchanger 24 functions as a condenser. In this case, the refrigerant in the four-way valve 26 flows along the solid line. As a result, the circulating air RA is cooled by the evaporation heat in the adsorbent application heat exchanger 23, dehumidified by the adsorbent in the adsorbent application heat exchanger 23, and then returned to the air circulation path. On the other hand, the outside air OA is warmed by the heat of condensation of the refrigerant in the adsorbent application heat exchanger 24. As a result, after the adsorbent of the adsorbent application heat exchanger 24 is regenerated (desorbed), it is exhausted EA.

  On the other hand, in the desorption / freezing / refrigeration operation mode, as shown in FIG. 12B, the adsorbent application heat exchanger 23 functions as a condenser, and the adsorbent application heat exchanger 24 functions as an evaporator. In this case, the refrigerant flows along the broken line. As a result, the circulating air RA is cooled by the heat of evaporation in the adsorbent application heat exchanger 24, dehumidified by the adsorbent in the adsorbent application heat exchanger 24, and then returned to the storage space 100. On the other hand, the outside air OA is warmed by the heat of condensation of the refrigerant in the adsorbent application heat exchanger 23, and after the adsorbent of the adsorbent application heat exchanger 23 is regenerated (desorbed), it is exhausted EA. Therefore, even in the detachment operation mode, the air circulation through the air circulation path that supplies the cool air to the storage space 100 is continued without interruption.

  Thereafter, each operation mode shown in FIGS. 12A and 12B is repeated.

In this embodiment, since the adsorbent application heat exchangers 23 and 24 are desorbed using the exhaust heat of the condenser 6 while being frozen and refrigerated, the power consumption W _{de, com} for desorption is zero. Therefore, the refrigeration / refrigeration system according to this embodiment can provide energy saving and drainless merit.

  For the control in this embodiment, the same control method as that in the third embodiment, that is, control by a timer (FIG. 11) can be applied in exactly the same manner. Therefore, a detailed description of the control contents is omitted, and the arrangement positions of the temperature sensors 66 and 67 in this embodiment are shown in FIG. FIG. 13A shows the adsorption operation mode, and FIG. 13B shows the desorption operation mode.

  The present invention can be effectively used in the industrial field in which a refrigeration / refrigeration system applied to a showcase or the like is manufactured and sold.

I Housing 1, 2, 24 Adsorbent application heat exchanger 2, 8, 13 Expansion valve 3, 11 Evaporator 5 Compressor 6 Condenser 10 Heater 14, 15 Solenoid valve

Claims (2)

Air having a storage space for storing refrigerated / refrigerated goods in the internal space of the housing, and supplying air cooled by the evaporator to the storage space via a discharge duct and returning to the evaporator via a suction duct A refrigeration / refrigeration system comprising a circulation path and a refrigerant circulation path for circulating a refrigerant between predetermined devices including an evaporator,
An adsorbent application heat exchanger with an adsorbent disposed on the upstream side of the evaporator in the air circulation path;
An expansion valve disposed between the adsorbent application heat exchanger and the evaporator on the upstream side in the refrigerant circuit;
A heater disposed on the upstream side of the adsorbent application heat exchanger in the air circulation path,
In the adsorption operation mode in which the adsorbent application heat exchanger adsorbs moisture in the air, the refrigerant is supplied from the compressor to the condenser, another expansion valve, and the adsorbent application heat exchanger. While forming the refrigerant circulation path that returns to the condenser via the expansion valve and the evaporator, and the air forms an air circulation path that exchanges heat with the evaporator via the adsorbent application heat exchanger,
In the desorption operation mode, which is an operation mode for desorbing the adsorbed moisture, control is performed so that air heated by a heater is supplied to the adsorbent application heat exchanger and the adsorbent application heat exchanger is desorbed. A refrigeration / refrigeration system characterized by Air having a storage space for storing refrigerated / refrigerated goods in the internal space of the housing, and supplying air cooled by the evaporator to the storage space via a discharge duct and returning to the evaporator via a suction duct A refrigeration / refrigeration system comprising a circulation path and a refrigerant circulation path for circulating a refrigerant between predetermined devices including an evaporator,
An adsorbent application heat exchanger with an adsorbent disposed on the upstream side of the evaporator in the air circulation path;
Another evaporator disposed in the refrigerant circuit,
Between the compressors and coagulation condenser, a first valve disposed in the refrigerant circulation path,
A second valve disposed in the refrigerant circuit between the compressor and the adsorbent application heat exchanger;
Between the adsorbent application heat exchanger and the other evaporator, and having another expansion valve disposed in the refrigerant circuit,
In the adsorption operation mode in which the adsorbent application heat exchanger adsorbs moisture in the air, the first valve is opened, the second valve is closed, and the refrigerant is compressed. Forming a refrigerant circulation path from the machine to the compressor via the condenser, expansion valve, and evaporator,
In the desorption operation mode, which is the operation mode for desorbing the adsorbed moisture, the first valve is closed, the second valve is opened, and the refrigerant is supplied from the compressor to the adsorbent application heat exchanger, A refrigeration / refrigeration system, wherein the adsorbent application heat exchanger is controlled to function as a condenser by forming a refrigerant circulation path that returns to the compressor via another expansion valve and the other evaporator. .