Ventilation system

Abstract

To provide a ventilation system capable of suppressing dew condensation on a ceiling plane, of moisture vapor contained in outside air introduced for ventilation for a store in which a cooling device having an opening at the upper side is arranged.SOLUTION: A ventilation system 100 includes an outside air introduction device 3 for introducing outside air Ao outside a store 400 along a ceiling plane 402 above an arrangement location in which a first cooling device 200 provided with an upper opening 201 for taking out a cooled commodity M1 is arranged in the store 400. The ventilation system 100 includes a control device 7 for performing, during operation of the first cooling device 200, control for stopping introduction of the outside air Ao by the outside air introduction device 3 on the basis of a dew point temperature Td based on a temperature and humidity of the outside air Ao outside the store 400 introduced by the outside air introduction device 3.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a ventilation system. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a ventilation system is known (see, for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses a ventilation volume estimation calculation system (ventilation system). This ventilation volume estimation calculation system is a system that calculates the ventilation volume in a store in which cooling equipment such as a built-in showcase and air conditioners are installed, taking into consideration the heat load on the air conditioner and cooling equipment. Here, the built-in showcase is a showcase for storing and displaying food and the like. The built-in showcase has a built-in freezer used in the showcase. The built-in showcase has an opening at the top for removing cooled food and the like.

[0004] The ventilation volume estimation calculation system of the above-mentioned Patent Document 1 includes an integrated controller. The integrated controller performs control to calculate the volume of ventilation inside the building based on the amount of water vapor measured by the air conditioning equipment installed in the store, the humidity of the air outside the store, and the humidity inside the store. This allows ventilation inside the store to be performed while suppressing the heat load (for example, the amount of electricity required for condensing water vapor) on the air conditioning equipment and cooling equipment caused by the amount of water vapor in the outside air that flows into the store for ventilation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2010-249492 A Summary of the Invention [Problem to be solved by the invention]

[0006] Here, in the ventilation volume estimation calculation system of Patent Document 1, outside air with a water vapor amount that suppresses the influence of the heat load on the air conditioner and the cooling equipment flows into the store for ventilation. However, since the ventilation volume estimation calculation system of Patent Document 1 only considers the influence of the heat load, depending on the amount of water vapor contained in the outside air, the temperature of the outside air flowing onto the ceiling surface reaches the dew point temperature because the built-in showcase as a cold heat source cools the ceiling surface by absorbing the radiant heat from the ceiling surface. In this case, it is considered that the water vapor contained in the outside air condenses on the ceiling surface. Therefore, the ventilation volume estimation calculation system of Patent Document 1 has a problem that the water vapor contained in the outside air flowing in (introduced) for ventilation cannot be suppressed from condensing on the ceiling surface due to the built-in showcase (cooling equipment) with an opening at the top.

[0007] This invention has been made to solve the problems described above, and one object of the invention is to provide a ventilation system that can suppress condensation of water vapor contained in outside air introduced for the purpose of ventilating a store in which cooling equipment with an opening at the top is installed, on the ceiling surface. [Means for solving the problem]

[0008] A ventilation system according to one aspect of the present invention includes an outside air introduction device that introduces outside air from outside the store along a ceiling surface above a location within a store where a first cooling device having an upper opening for removing cooled goods is placed, and a control device that, while the first cooling device is operating, controls the outside air introduction device to stop introducing the outside air based on a dew point temperature based on the temperature and humidity of the outside air outside the store introduced by the outside air introduction device.

[0009] In the ventilation system according to one aspect of the present invention, as described above, a control device is provided that controls the outside air introduction device to stop the introduction of outside air based on a dew point temperature based on the temperature and humidity of the outside air introduced by the outside air introduction device while the first cooling device is in operation. This makes it possible to stop the introduction of outside air by the outside air introduction device when the outside air reaches the dew point temperature when introduced into the store, thereby preventing the outside air that reaches the dew point temperature from flowing near the ceiling surface that is cooled by absorbing the radiant heat of the ceiling surface using the first cooling device as a cold heat source. As a result, it is possible to prevent water vapor contained in the outside air introduced for ventilation of a store in which a first cooling device with an opening provided at the top is installed from condensing on the ceiling surface.

[0010] In the ventilation system according to the above aspect, the outside air introduction device is preferably provided on the upper surface of the second cooling device having a side opening for removing the cooled products, and includes an air guide section for guiding the outside air to flow horizontally near the ceiling surface, and the control device is configured to control the outside air introduction device to stop based on the dew point temperature when the air guide section is guiding the outside air horizontally near the ceiling surface during operation of the first cooling device. With this configuration, the outside air can be guided by the air guide section so that the outside air is not caught in the air curtains formed at the upper opening of the first cooling device and the side opening of the second cooling device, and therefore the rise in temperature of the first cooling device and the second cooling device caused by the outside air can be suppressed. Here, when the outside air is flowing near the ceiling surface to guide it with the air guidance section so that it is not drawn into the air curtain, if the outside air reaches the dew point temperature when it is introduced into the store, the introduction of the outside air by the outside air introduction device can be stopped, so that the outside air that reaches the dew point temperature can be prevented from flowing near the ceiling surface that has been cooled by absorbing the radiant heat of the ceiling surface with the first cooling device as a cold heat source. As a result, the air guidance section can prevent the temperature rise of the first cooling device and the second cooling device caused by the outside air, and can also prevent water vapor from condensing on the ceiling surface.

[0011] In the ventilation system according to the above aspect, preferably, the control device further includes a temperature acquisition unit arranged in the store for acquiring the temperature near the ceiling surface, and the control device is configured to acquire the temperature near the ceiling surface based on the measurement value of the temperature acquisition unit, and to perform control to stop the introduction of outside air by the outside air introduction device when the dew point temperature is lower than the temperature near the ceiling surface while the first cooling device is in operation. With this configuration, the temperature near the ceiling surface can be acquired by the temperature acquisition unit, so that the introduction of outside air by the outside air introduction device can be appropriately stopped. As a result, it is possible to prevent the introduction of outside air by the outside air introduction device from being stopped more than necessary.

[0012] In the ventilation system according to the above aspect, the outside air introduction device preferably includes at least one of a blower unit that sends outside air into the store, an opening / closing unit that opens and closes an outside opening of the outside air introduction device, and an outside air flow rate adjustment valve that adjusts the flow rate of outside air introduced into the store by the outside air introduction device, and the control device is configured to control the outside air introduction device to stop introducing outside air by at least one of stopping the blower unit's blowing, closing the outside opening of the store by the opening / closing unit, and closing the outside air flow rate adjustment valve. With this configuration, it is easy to stop the introduction of outside air by the outside air introduction device when the outside air reaches a dew point temperature when introduced into the store.

[0013] In the ventilation system equipped with the outside air introduction device including the air guide section, preferably, an air conditioner is provided on the ceiling surface inside the store downstream of the ceiling surface above the opening of the first cooling device in the flow direction of the outside air guided by the air guide section, and performs cooling and heating of the air inside the store, and the control device is configured to control the outside air introduction by the outside air introduction device to stop based on the dew point temperature when controlling the air guide section to introduce the outside air while blowing the cooled or heated air inside the store from the air conditioner. With this configuration, since the air conditioner is provided on the ceiling surface downstream of the flow direction of the outside air guided by the air guide section, the outside air introduced by the outside air introduction device can be directly flowed to the air conditioner by the air guide section, so that the outside air can be cooled (or heated) by the air conditioner early. As a result, unintended temperature changes in the store caused by the outside air can be suppressed, and the temperature state in the store can be maintained good.

[0014] In the ventilation system according to the above aspect, the control device is preferably configured to control the outside air introduction device to stop the introduction of the outside air based on the dew point temperature of the introduced outside air when the control device controls the outside air introduction device to pass through the opposing ceiling surface of the ceiling surface that faces the opening above the first cooling device during operation of the first cooling device. With this configuration, it is possible to prevent outside air that reaches the dew point temperature from flowing near the opposing ceiling surface that is cooled by absorbing the radiant heat of the ceiling surface that uses the first cooling device as a cold heat source, and therefore it is possible to prevent water vapor contained in the outside air introduced for ventilation from condensing on the ceiling surface. Effect of the Invention

[0015] According to the present invention, as described above, it is possible to prevent water vapor contained in outside air introduced for ventilation into a store in which cooling equipment with an opening at the top is installed from condensing on the ceiling surface. [Brief description of the drawings]

[0016] [Figure 1]1 is a plan view showing an example of a store to which the ventilation system of the present embodiment is applied. [Diagram 2] 1 is a side view showing an example of a store to which the ventilation system of the present embodiment is applied. [Diagram 3] FIG. 2 is a block diagram showing a control configuration of the ventilation system of the present embodiment. [Figure 4] 2 is a schematic diagram showing a state in which outside air is introduced by an outside air introduction device of the ventilation system of the present embodiment. FIG. [Diagram 5] 1 is a schematic diagram showing a state in which the introduction of outside air by the outside air introduction device of the ventilation system of the present embodiment is stopped. FIG. [Figure 6] 1 is a graph of a saturated vapor curve showing an example of the dew point temperature and the temperature near the opposing ceiling surface obtained in the ventilation system of this embodiment. [Figure 7] 5 is a flowchart of outside air introduction control processed in the control device of the ventilation system of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0018] A ventilation system 100 according to an embodiment of the present invention will be described with reference to FIGS.

[0019] As shown in Fig. 1, ventilation system 100 is a system that ventilates the inside of store 400 in which ice case 200, showcase 300, etc. are arranged. Store 400 is provided with, for example, product display shelves 500, cooking appliances (not shown), product warehouse 600, and toilet 700. Store 400 is, for example, a convenience store, supermarket, or drug store. Ice case 200 is an example of a "first refrigeration device" in the claims. Also, showcase 300 is an example of a "second refrigeration device" in the claims.

[0020] Here, the up-down direction is the Z direction, the up direction is the Z1 direction, and the down direction is the Z2 direction. A first horizontal direction is the X direction, one side of the X direction is the X1 direction, and the other side of the X direction is the X2 direction. A second horizontal direction perpendicular to the X direction is the Y direction, one side of the Y direction is the Y1 direction, and the other side of the Y direction is the Y2 direction.

[0021] As shown in FIG. 2, ice case 200 is a device for cooling (freezing) products M1 (subjects to be cooled) such as frozen foods, ice cream, and ice displayed inside. Ice case 200 has an upper opening 201 for removing cooled products M1. In ice case 200, an air curtain that flows in the Y1 direction (or Y2 direction) is formed at upper opening 201. The air curtain has a function of suppressing the outflow of cool air from storage space 202 for product M1 inside the storage, and suppressing the inflow of air from inside store 400 into storage space 202. This suppresses the rise in temperature inside ice case 200. Ice case 200 includes a cooling circulation circuit (not shown) that circulates a refrigerant for cooling the air inside the storage. The cooling circulation circuit is provided with a compressor, a condenser, an expansion valve, an evaporator, and the like that change the temperature and pressure of the refrigerant circulating inside. The cooling circulation circuit may be built into ice case 200, or a part of the condenser and the like may be provided outside.

[0022] The showcase 300 is a device for cooling (freezing or refrigerating) products M2 (subjects to be cooled), such as fresh foods and beverages, displayed on shelves inside the showcase 300. The showcase 300 is provided with an opening 301 in the Y1 direction (side) through which the cooled products M2 are taken out. In the showcase 300, an air curtain that flows in the Z2 direction is formed at the opening 301 in the Y1 direction. The air curtain has the function of suppressing the outflow of cool air from the storage space 302 for the products M2 inside the showcase, and suppressing the inflow of air from inside the store 400 into the storage space 302. This suppresses the rise in temperature inside the showcase 300. The showcase 300 includes a cooling circulation circuit (not shown) that circulates a refrigerant for cooling the air inside the showcase. The cooling circulation circuit is provided with a compressor, a condenser, an expansion valve, an evaporator, and the like that change the temperature and pressure of the refrigerant circulating inside. The cooling circulation circuit may be built into the showcase 300, or a part of it such as a condenser may be provided externally.

[0023] Each of the ice case 200 and the showcase 300 is disposed away from the entrance 401 in the Y2 direction within the store 400. The ice case 200 is disposed adjacent to the showcase 300 on the Y1 direction side. The showcase 300 is disposed along a wall surface facing the entrance 401 in the Y2 direction.

[0024] (Ventilation system) As shown in Fig. 1, the ventilation system 100 includes an air conditioner 1, an exhaust device 2, an outside air introduction device 3, a ceiling surface temperature and humidity sensor 4, an in-store temperature and humidity sensor 5, an outside-store temperature and humidity sensor 6 (see Fig. 2), and a control device 7. Each of the ceiling surface temperature and humidity sensor 4 and the in-store temperature and humidity sensor 5 is an example of a "temperature acquisition unit" in the claims.

[0025] (Air conditioner) The air conditioner 1 is an indoor unit that cools and heats the air in the store 400 to adjust the temperature and humidity in the store 400. The air conditioner 1 is connected to an outdoor unit (not shown) by refrigerant piping. The air conditioner 1 includes a part (e.g., an evaporator) of an air conditioning circulation circuit (not shown) that circulates a refrigerant for cooling and heating the air in the store 400. The outdoor unit includes a configuration (e.g., a compressor and a condenser) that is different from the configuration included in the air conditioner 1 in the air conditioning circulation circuit (not shown). The air conditioning circulation circuit includes a compressor, a condenser, an expansion valve, an evaporator, and the like that change the temperature and pressure of the refrigerant circulating inside. The air conditioner 1 can be operated by a remote control (not shown) that accepts operations by a user.

[0026] Air conditioner 1 is provided on ceiling surface 402 inside the store downstream in the FL direction from ceiling surface 402 in the Z1 direction of opening 201 of ice case 200. Air conditioner 1 is disposed on ceiling surface 402 inside the store downstream in the FL direction from an opposing ceiling surface 402a of ceiling surface 402 that faces opening 201 of ice case 200. Air conditioner 1 is provided, for example, in the center in the horizontal direction of ceiling surface 402 inside store 400. The FL direction is the flow direction of outside air Ao guided by air guidance section 32, which will be described later.

[0027] (Exhaust system) Exhaust device 2 is configured to exhaust air from inside store 400 to the outside of store 400. Exhaust device 2 includes exhaust fan 21, exhaust air guide section 22, and exhaust port 23. Exhaust device 2 is disposed, for example, near entrance 401 and in toilet 700.

[0028] (Outside air intake device) 2, outside air introduction device 3 is configured to introduce outside air Ao from outside store 400 along ceiling surface 402 above the location where ice case 200 is placed within store 400. Outside air introduction device 3 introduces outside air Ao from outside store 400 along ceiling surface 402 so as to prevent outside air Ao from flowing into each of ice case 200 and showcase 300.

[0029] Specifically, the outside air introduction device 3 includes an outside air introduction duct 31, an air guide section 32, an outside air introduction fan 33, an opening / closing section 34, and an outside air flow rate adjustment valve 35. The outside air introduction fan 33 is an example of the "blower section" in the claims.

[0030] The outside air introduction duct 31 has an introduction passage therein that connects the outside of the store 400 with the inside of the store 400. The inside-store opening 31a of the outside air introduction duct 31 is disposed on the Y2 side of a location on the ceiling surface 402 inside the store 400 in the Z1 direction of the showcase 300. The outside-store opening 31b of the outside air introduction duct 31 is disposed outside the store 400.

[0031] The air guide section 32 is configured to guide the outside air Ao that has passed through the outside air introduction duct 31 to flow horizontally near the ceiling surface 402. The air guide section 32 is an air direction plate provided on the upper surface of the showcase 300. The air guide section 32 has a protruding section 32a that protrudes in the Z1 direction from an end of the upper surface of the showcase 300 in the Y1 direction. The outside air Ao that has passed through the outside air introduction duct 31 passes between the protruding section 32a and the ceiling surface 402, and flows in the FL direction along the horizontal direction near the ceiling surface 402.

[0032] The outside air introduction fan 33 is configured to send outside air Ao into the store 400. The outside air introduction fan 33 is arranged inside the store 400 in the outside air introduction duct 31. The opening / closing unit 34 is configured to open and close the store outer opening 31b of the outside air introduction duct 31. The opening / closing unit 34 is a louver, a shutter, or the like. The outside air flow rate adjustment valve 35 is configured to adjust the flow rate of the outside air Ao introduced into the store 400 by the outside air introduction device 3. The outside air flow rate adjustment valve 35 is arranged outside the store 400 with respect to the outside air introduction fan 33 in the outside air introduction duct 31.

[0033] (Multiple temperature and humidity sensors) Each of the ceiling surface temperature and humidity sensor 4 and the in-store temperature and humidity sensor 5 is a temperature and humidity sensor for acquiring the temperature Tin in the vicinity of the opposing ceiling surface 402a of the ceiling surface 402.

[0034] The ceiling surface temperature and humidity sensor 4 is a sensor that directly measures the temperature Tin and humidity near the opposing ceiling surface 402a. The ceiling surface temperature and humidity sensor 4 is disposed on the ceiling surface 402 between the store inside opening 31a of the outside air introduction device 3 and the part of the opposing ceiling surface 402a on the store inside opening 31a side. In other words, the ceiling surface temperature and humidity sensor 4 is disposed on the showcase 300 side (Y2 direction side) of the opposing ceiling surface 402a.

[0035] The in-store temperature and humidity sensor 5 is a sensor that measures the temperature and humidity in the middle part in the Z direction inside the store 400. The control device 7 estimates (acquires) the temperature Tin near the opposing ceiling surface 402a based on the measurement values ​​transmitted from the in-store temperature and humidity sensor 5, so the in-store temperature and humidity sensor 5 is a sensor for indirectly measuring the temperature Tin and humidity near the opposing ceiling surface 402a. The in-store temperature and humidity sensor 5 is attached, for example, to a product display shelf 500 on the Y1 direction side (the entrance 401 side) of the locations where the ice case 200 and the showcase 300 are arranged inside the store 400.

[0036] The outside-store temperature and humidity sensor 6 is a sensor for measuring the temperature and humidity of the outside air Ao outside the store 400. The outside-store temperature and humidity sensor 6 is disposed near the outside-store opening 31b.

[0037] (Control device) The control device 7 controls the air conditioning device 1, exhaust device 2, outside air introduction device 3, ice case 200, showcase 300, etc. based on the measurement values ​​of various sensors including the ceiling surface temperature and humidity sensor 4, the in-store temperature and humidity sensor 5, and the outside-store temperature and humidity sensor 6.

[0038] The control device 7 is electrically connected to each of the exhaust device 2, the outside air introduction device 3, the ceiling surface temperature and humidity sensor 4, the in-store temperature and humidity sensor 5, the outside-store temperature and humidity sensor 6, the ice case 200, and the showcase 300. Here, the outside air introduction fan 33 is electrically connected to the control device 7 via a speed control unit that generates a drive signal to change the rotation speed of the outside air introduction fan 33 based on a signal from the control device 7. The opening and closing unit 34 is electrically connected to the control device 7 via an opening and closing control unit that generates a drive signal to open and close the opening and closing unit 34 based on a signal from the control device 7. The outside air flow rate adjustment valve 35 is electrically connected to the control device 7 via a flow rate control unit that generates a drive signal to change the opening degree of the outside air flow rate adjustment valve 35 based on a signal from the control device 7. The ice case 200 is electrically connected to the control device 7 via a refrigeration control unit that controls the freezing of the product M1 and the defrosting of the interior based on a signal from the control device 7. The showcase 300 is electrically connected to the control device 7 via a cooling control unit that controls the cooling of the product M2 and the defrosting of the interior based on a signal from the control device 7.

[0039] The control device 7 includes a central processing unit (CPU), a storage unit such as a solid state drive (SSD) or a hard disk drive (HDD), and memories such as a read only memory (ROM) and a random access memory (RAM).

[0040] (Outside air intake control) As shown in FIG. 4, in the ventilation system 100, the outside air Ao from outside the store 400 is introduced by the outside air introduction device 3 along the ceiling surface 402 so as not to flow into the interiors of the ice case 200 and the showcase 300. In addition, in the ventilation system 100, the air inside the store 400 is exhausted to the outside of the store 400 by the exhaust device 2. In FIG. 4, the introduced outside air Ao flows along the FL direction through the hatched portion. Here, in the store 400 in FIG. 4, the heat of the facing ceiling surface 402a (the portion of the ceiling surface 402 surrounded by a thin dotted line in FIG. 3) facing the opening 201 of the ice case 200 is cooled by the cold air inside the ice case 200 by absorbing radiant heat. Therefore, due to a decrease in the temperature of the facing ceiling surface 402a, the water vapor of the outside air Ao flowing near the facing ceiling surface 402a may condense on the facing ceiling surface 402a. This condensation is likely to occur when the humidity of the outside air Ao is high, and is thought to be more likely to occur when the hot and humid outside air Ao in summer flows near the opposing ceiling surface 402a.

[0041] Therefore, as shown in Fig. 5, the control device 7 of this embodiment performs control to stop the introduction of the outside air Ao by the outside air introduction device 3 while the ice case 200 is in operation, based on a dew point temperature Td (see Fig. 6) based on the temperature and humidity of the outside air Ao outside the store 400 introduced by the outside air introduction device 3. Specifically, the control device 7 acquires the temperature Tin near the opposing ceiling surface 402a based on the measurement value of the ceiling surface temperature and humidity sensor 4, and performs control to stop the introduction of the outside air Ao by the outside air introduction device 3 while the ice case 200 is in operation, if the dew point temperature Td is lower than the temperature Tin near the ceiling surface (see Fig. 6). Here, the dew point temperature Td is calculated by the control device 7 based on the measurement value of the temperature and the measurement value of the humidity measured by the outside-store temperature and humidity sensor 6.

[0042] As shown in Fig. 6, when the dew point temperature Td is lower than the temperature Tin near the ceiling surface, condensation may occur on the opposing ceiling surface 402a. In such a case, the ventilation system 100 of this embodiment stops the introduction of the outside air Ao to prevent the introduction of the outside air Ao that may condense on the opposing ceiling surface 402a. Even if the introduction of the outside air Ao by the outside air introduction device 3 is stopped, the exhaust device 2 exhausts the air in the store 400, creating a negative pressure in the store 400, so that the outside air Ao is introduced into the store 400 from the entrance 401 of the store 400, the windows in the store 400, the windows of the toilet 700, and the windows of the product warehouse 600. Therefore, the store 400 is sufficiently ventilated.

[0043] That is, as shown in FIG. 5, when the ice case 200 is in operation and the air guidance section 32 is flowing the outside air Ao horizontally near the ceiling surface 402, the control device 7 controls the outside air introduction device 3 to stop introducing the outside air Ao based on the dew point temperature Td of the outside air Ao outside the store 400.

[0044] Specifically, while the ice case 200 is in operation, the control device 7 controls the outside air Ao to be introduced from the outside air introduction device 3 so as to pass through the facing ceiling surface 402a, and controls the outside air introduction device 3 to stop introducing the outside air Ao based on the dew point temperature Td of the introduced outside air Ao. Also, while the control device 7 controls the outside air Ao to be introduced by the air guide section 32 while blowing cooled or heated air from the air conditioner 1 into the store 400, the control device 7 controls the outside air introduction device 3 to stop introducing the outside air Ao based on the dew point temperature Td. Here, the air conditioner 1 may take in the outside air Ao introduced by the outside air introduction device 3 and heat or cool it, or may mix the cooled or heated air and the outside air Ao introduced by the outside air introduction device 3 and blow them together.

[0045] Here, the control device 7 performs control to stop the introduction of outside air Ao by the outside air introduction device 3 by both stopping the blowing of air by the outside air introduction fan 33 (shown by hatching in FIG. 5) and closing the store outer opening 31b by the opening / closing unit 34. Furthermore, based on the fact that the blowing of air by the outside air introduction fan 33 has been stopped, the control device 7 performs control to notify the display unit (not shown) that the blowing of air by the outside air introduction fan 33 has been stopped and the introduction of outside air Ao by the outside air introduction device 3 has been stopped.

[0046] (Outside air intake control) Below, the outside air introduction control by the control device 7 of the ventilation system 100 will be described with reference to FIG.

[0047] As shown in FIG. 7, in step S1, the outside air Ao is introduced into the store 400 by the outside air introduction device 3 (see FIG. 4). In step S2, it is determined whether the dew-point temperature Td based on the measured values ​​of the temperature and humidity of the outside-store temperature and humidity sensor 6 is lower than the temperature Tin near the opposing ceiling surface 402a based on the measured values ​​of the ceiling surface temperature and humidity sensor 4. If the dew-point temperature Td is lower than the temperature Tin near the opposing ceiling surface 402a based on the measured values ​​of the ceiling surface temperature and humidity sensor 4, the process proceeds to step S3, where the introduction of the outside air Ao by the outside air introduction device 3 is stopped (see FIG. 5) and the outside air introduction control ends. If the dew-point temperature Td is equal to or higher than the temperature Tin near the opposing ceiling surface 402a based on the measured values ​​of the ceiling surface temperature and humidity sensor 4, the outside air introduction control ends without stopping the introduction of the outside air Ao.

[0048] (Effects of this embodiment) In this embodiment, the following effects can be obtained.

[0049] In this embodiment, as described above, the ventilation system 100 includes a control device 7 that performs control to stop the introduction of the outside air Ao by the outside air introduction device 3 based on the dew point temperature Td based on the temperature and humidity of the outside air Ao outside the store 400 introduced by the outside air introduction device 3 while the ice case 200 is in operation. This makes it possible to stop the introduction of the outside air Ao by the outside air introduction device 3 when the outside air Ao reaches the dew point temperature Td when introduced into the store 400, thereby preventing the outside air Ao that reaches the dew point temperature Td from flowing near the ceiling surface 402 that is cooled by absorbing the radiant heat of the ceiling surface 402 using the ice case 200 as a cold heat source. As a result, it is possible to prevent the water vapor contained in the outside air Ao introduced for ventilation of the store 400 in which the ice case 200 with the opening 201 provided at the top is placed from condensing on the ceiling surface 402.

[0050] In this embodiment, as described above, the outside air introduction device 3 is provided on the upper surface of the showcase 300 in which the side opening 301 through which the cooled product M2 is taken out is provided, and includes the air guide section 32 that guides the outside air Ao to flow horizontally near the ceiling surface 402. When the outside air Ao is flowing horizontally near the ceiling surface 402 by the air guide section 32 during operation of the ice case 200, the control device 7 performs control to stop the introduction of the outside air Ao by the outside air introduction device 3 based on the dew point temperature Td. This allows the air guide section 32 to guide the outside air Ao so that the outside air Ao is not caught in the air curtains formed at the upper opening 201 of the ice case 200 and the side opening 301 of the showcase 300, and therefore it is possible to suppress an increase in the temperature inside each of the ice case 200 and the showcase 300 caused by the outside air Ao. Here, when the outside air Ao is flowing near the ceiling surface 402 in order to guide the outside air Ao by the air guide section 32 so as not to get caught in the air curtain, if the outside air Ao reaches a dew point temperature Td when introduced into the store 400, the introduction of the outside air Ao by the outside air introduction device 3 can be stopped, so that the outside air Ao that reaches the dew point temperature Td can be prevented from flowing near the ceiling surface 402 that has been cooled by the absorption of radiant heat by the ceiling surface 402, which uses the ice case 200 as a cold source. As a result, the air guide section 32 can prevent a rise in temperature inside each of the ice case 200 and the showcase 300 caused by the outside air Ao, and can also prevent water vapor from condensing on the ceiling surface 402.

[0051] In the present embodiment, as described above, the ventilation system 100 is provided with the ceiling surface temperature and humidity sensor 4 arranged in the store 400 for acquiring the temperature Tin near the ceiling surface 402. The control device 7 acquires the temperature Tin near the ceiling surface 402 based on the measurement value of the ceiling surface temperature and humidity sensor 4, and performs control to stop the introduction of the outside air Ao by the outside air introduction device 3 when the dew point temperature Td is lower than the temperature Tin near the ceiling surface 402 while the ice case 200 is in operation. As a result, the temperature Tin near the ceiling surface 402 can be acquired by the ceiling surface temperature and humidity sensor 4, and therefore the introduction of the outside air Ao by the outside air introduction device 3 can be appropriately stopped. As a result, it is possible to prevent the introduction of the outside air Ao by the outside air introduction device 3 from being stopped more than necessary.

[0052] In this embodiment, as described above, the outside air introduction device 3 includes the outside air introduction fan 33 that sends the outside air Ao into the store 400, the opening / closing unit 34 that opens and closes the store outside opening 31b of the outside air introduction device 3, and the outside air flow rate adjustment valve 35 that adjusts the flow rate of the outside air Ao introduced into the store 400 by the outside air introduction device 3. The control device 7 controls the outside air introduction device 3 to stop introducing the outside air Ao by stopping the blowing of the outside air introduction fan 33 and closing the store outside opening 31b by the opening / closing unit 34. This makes it easy to stop the introduction of the outside air Ao by the outside air introduction device 3 in cases where the outside air Ao reaches the dew point temperature Td when introduced into the store 400. In addition, by closing the store outside opening 31b by the opening / closing unit 34, the user can visually confirm the closed state of the opening / closing unit 34, so the user can easily confirm that the introduction of the outside air Ao by the outside air introduction device 3 has been stopped.

[0053] In this embodiment, as described above, the ventilation system 100 includes an air conditioner 1 that is provided on the ceiling surface 402 in the store 400 downstream in the FL direction (flow direction) of the outside air Ao guided by the air guide section 32 from the ceiling surface 402 above the opening 201 of the ice case 200, and that cools and heats the air in the store 400. The control device 7 controls the outside air introduction device 3 to stop introducing the outside air Ao based on the dew point temperature Td while controlling the air guide section 32 to introduce the outside air Ao while blowing the cooled or heated air in the store 400 from the air conditioner 1. As a result, since the air conditioner 1 is provided on the ceiling surface 402 downstream in the FL direction, the outside air Ao introduced by the outside air introduction device 3 can be directly flowed to the air conditioner 1 by the air guide section 32, and the air conditioner 1 can quickly cool (or heat) the outside air Ao. As a result, unintended temperature changes in the store 400 caused by the outside air Ao can be suppressed, and the temperature conditions in the store 400 can be kept good.

[0054] In this embodiment, as described above, when the control device 7 controls the introduction of the outside air Ao from the outside air introduction device 3 so that the outside air Ao passes through the facing ceiling surface 402a of the ceiling surface 402 that faces the upper opening 201 of the ice case 200 during operation of the ice case 200, the control device 7 controls to stop the introduction of the outside air Ao by the outside air introduction device 3 based on the dew point temperature Td of the introduced outside air Ao. This makes it possible to prevent the outside air Ao that reaches the dew point temperature Td from flowing near the facing ceiling surface 402a that has been cooled by absorbing the radiant heat of the facing ceiling surface 402a, which uses the ice case 200 as a cold heat source, and therefore makes it possible to prevent the water vapor contained in the outside air Ao introduced for ventilation from condensing on the ceiling surface 402.

[0055] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the description of the embodiments above, and further includes all modifications (variations) within the meaning and scope of the claims.

[0056] For example, in the above embodiment, the control device 7 acquires the temperature Tin near the opposing ceiling surface 402a based on the measurement value of the ceiling surface temperature and humidity sensor 4, and when the dew point temperature Td is lower than the temperature Tin near the ceiling surface while the ice case 200 is in operation, controls the outdoor air introduction device 3 to stop introducing the outdoor air Ao, but the present invention is not limited to this. In the present invention, the control device may acquire an estimated temperature near the opposing ceiling surface based on the measurement value transmitted from the in-store temperature and humidity sensor, and when the dew point temperature is lower than the temperature near the ceiling surface, control the outdoor air introduction device to stop introducing the outdoor air. Also, the control device may acquire the temperature near the opposing ceiling surface based on the measurement value of the ceiling surface temperature and humidity sensor, acquire the temperature near the opposing ceiling surface estimated based on the measurement value transmitted from the in-store temperature and humidity sensor, and control the outdoor air introduction device to stop introducing the outdoor air when the dew point temperature is lower than the temperatures near both ceiling surfaces.

[0057] In the above embodiment, the control device 7 performs control to stop the introduction of outside air Ao by the outside air introduction device 3 by both stopping the outside air introduction fan 33 (blower unit) from blowing air and closing the store outside opening 31b by the opening / closing unit 34, but the present invention is not limited to this. In the present invention, the control device may perform control to stop the introduction of outside air by the outside air introduction device by at least one of stopping the blower unit from blowing air, closing the store outside opening by the opening / closing unit, and closing the outside air flow rate adjustment valve.

[0058] In the above embodiment, the control device 7 acquires the temperature Tin near the opposing ceiling surface 402a based on the measurement value of the ceiling surface temperature and humidity sensor 4, but the present invention is not limited to this. In the present invention, the control device may acquire the specific enthalpy near the opposing ceiling surface based on the measurement value of the ceiling surface temperature and humidity sensor.

[0059] In the above embodiment, for convenience of explanation, the control process of the control device 7 is described using a flow-driven flowchart in which the process is performed in order according to the process flow, but the present invention is not limited to this. In the present invention, the control process of the control unit may be performed by an event-driven process in which the process is performed on an event-by-event basis. In this case, the control process may be performed completely event-driven, or may be performed in a combination of event-driven and flow-driven. [Explanation of symbols]

[0060] 1 Air conditioner 3. Outside air intake device 4. Ceiling temperature and humidity sensor (temperature acquisition section) 5. In-store temperature and humidity sensor (temperature acquisition section) 7 Control device 31b Store exterior opening 32 Airflow section 33 Outside air intake fan (blower section) 34 Opening and closing section 35 Outside air flow control valve 100 Ventilation System 200 Ice case (first cooling device) 201 (Above the first cooling device) opening 300 Showcase (Second cooling device) 301 (side opening of second cooling device) 400 stores 402 Ceiling surface 402a Facing ceiling surface Airo M1 product Td Dew point temperature Tin (Temperature near the ceiling surface) Temperature

Claims

1. an outside air introduction device that introduces outside air from outside the store along a ceiling surface above a location in the store where a first cooling device having an upper opening for removing cooled products is placed; a control device that controls the outside air introduction device to stop introducing outside air based on a dew point temperature based on the temperature and humidity of the outside air outside the store introduced by the outside air introduction device while the first cooling device is operating.

2. the outside air introduction device is provided on an upper surface of the second cooling device having a side opening for removing the cooled products, and includes an air guide section for guiding the outside air to flow horizontally near the ceiling surface; The ventilation system of claim 1, wherein the control device is configured to control the outside air introduction device to stop introducing outside air based on the dew point temperature when the first cooling device is operating and the air guidance section is flowing outside air horizontally near the ceiling surface.

3. A temperature acquisition unit is provided in the store to acquire a temperature near the ceiling surface, The ventilation system of claim 1, wherein the control device is configured to acquire the temperature near the ceiling surface based on the measurement value of the temperature acquisition unit, and to control the outdoor air introduction device to stop the introduction of outdoor air when the dew point temperature is lower than the temperature near the ceiling surface while the first cooling device is operating.

4. The outside air introduction device includes at least one of a blower unit that sends outside air into the store, an opening / closing unit that opens and closes a store outer opening of the outside air introduction device, and an outside air flow rate regulating valve that adjusts the flow rate of the outside air introduced into the store by the outside air introduction device, The ventilation system described in claim 1, wherein the control device is configured to control the stopping of the introduction of outside air by the outside air introduction device by at least one of stopping the blowing of air by the blowing unit, closing the outside opening of the store by the opening / closing unit, and closing the outside air flow control valve.

5. An air conditioner is provided on the ceiling surface of the store downstream of the ceiling surface above the opening of the first cooling device in a flow direction of the outside air guided by the air guide unit, and the air conditioner cools and heats the air in the store, The ventilation system of claim 2, wherein the control device is configured to control the outside air introduction device to stop introducing outside air based on the dew point temperature when controlling the air introduction section to introduce outside air while blowing cooled or heated air into the store from the air conditioning unit.

6. The ventilation system of claim 1, wherein the control device is configured to control the introduction of outside air from the outside air introduction device to pass through an opposing ceiling surface of the ceiling surface that faces the opening above the first cooling device while the first cooling device is in operation, and to control the introduction of outside air by the outside air introduction device to stop based on the dew point temperature of the introduced outside air.

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