JP6969197B2 - Air supply control system for stores - Google Patents

Description

The present invention relates to an air supply amount control system for stores such as convenience stores.

In stores such as convenience stores, the inside of the store is in a negative pressure state because the waste heat from equipment such as open showcases and coffee machines is discharged to the outside by ventilation fans, etc., and the entrance door is in this state. When it was opened, outside air invaded, and the load on the in-store air conditioner increased during the season when the difference between the in-store temperature and the out-of-store temperature was large.

As a means for suppressing this intrusion of outside air, conventionally, for example, the pressure difference between the inside and outside of the store is measured by a differential pressure gauge and controlled so as to keep the inside of the store at a positive pressure (see, for example, Patent Document 1). However, in the positive pressure control by the differential pressure gauge, there is a problem that the measured value suddenly fluctuates due to the disturbance such as wind, and the control becomes unstable.

As a means for solving this problem, a technique using a reference pressure transmission device using a large-scale hollow tube used in a positive pressure control system using a differential pressure gauge in a clean room is disclosed (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2001-153441 Japanese Unexamined Patent Publication No. 2013-24450

By the way, the above-mentioned reference pressure transmission device using a large-scale hollow pipe has a problem of increasing the size and cost of the entire device, and cannot be adopted in an air conditioning system for stores.

In view of the above circumstances, an object of the present invention is to provide an air supply amount control system for a store, which can suppress the increase in size and cost of the device and can control the inside of the store to a positive pressure.

In order to achieve the above object, the air supply amount control system for a store according to the present invention includes a ventilation means for discharging the air in the store to the outside of the store, an air supply means for supplying the outside air to the inside of the store, and an air supply means in the store. The inside-store temperature detecting means that detects the temperature, the outside-store temperature detecting means that detects the outside air temperature outside the store, and the outside air are communicated inside and outside the store, and when the pressure inside the store is lower than the pressure outside the store, the outside air is released. The temperature inside the store approaches the temperature outside the store by flowing into the store, while when the pressure inside the store is higher than the temperature outside the store, the air inside the store flows out to the outside and becomes close to the temperature inside the store. However, it is provided with a ventilation port temperature detecting means installed in the ventilation port and detecting the temperature in the ventilation port, and an air supply amount control means for controlling the amount of air supplied to the store by the air supply means. The air supply amount control means is characterized in that a reference temperature difference is calculated from the temperature information collected from each temperature detection means, and the supply air amount is controlled by the reference temperature difference to keep the inside of the store at a positive pressure. do.

Further, the air supply amount control system for stores according to the present invention is characterized in that the reference temperature difference is calculated from the following equation. Reference temperature difference = temperature inside the store + temperature outside the store-2 x temperature inside the ventilation port

Further, the air supply amount control system for stores according to the present invention is characterized in that the air supply amount control means stops the air supply means when the difference between the temperature inside the store and the temperature outside the store is less than the third threshold value. And.

According to the present invention, a ventilation means for discharging the air inside the store to the outside of the store, an air supply means for supplying the outside air to the inside of the store, a temperature detecting means inside the store for detecting the temperature inside the store, and an outside air outside the store. When the air pressure inside the store is lower than the air pressure outside the store, the outside air flows into the store and becomes closer to the temperature outside the store. , When the air pressure inside the store is higher than the air pressure outside the store, it is installed in the ventilation port where the temperature inside the store is close to the temperature inside the store due to the outflow of the air inside the store, and the temperature inside the ventilation port is detected. The air supply port temperature detecting means and the air supply amount controlling means for controlling the amount of air supplied to the store by the air supply means are provided, and the air supply amount controlling means is collected from each of the temperature detecting means. By calculating the reference temperature difference from the temperature information and controlling the amount of air supply by the reference temperature difference to keep the inside of the store at a positive pressure, the inside of the store is positive without the control becoming unstable due to disturbance such as wind. It is possible to maintain the air pressure, which makes it possible to save energy in air conditioning, and also has the effect of suppressing the increase in size and cost of the entire air supply amount control system.

Further, if the difference between the temperature inside the store and the temperature outside the store is smaller than a predetermined value, the air supply amount control means stops the operation of the air supply means, so that further energy saving is possible. Also plays.

FIG. 1 is a schematic configuration diagram of an air supply amount control system for stores according to the first embodiment of the present invention. FIG. 2 is a graph showing the relationship (during heating) between the air volume of the air supply fan and the temperature inside the store, inside the ventilation port, and outside the store. FIG. 3 is a graph showing the relationship between the air supply fan air volume and the reference temperature difference (during heating). FIG. 4 is a schematic configuration diagram of the inverter control device shown in FIG. FIG. 5 is a flowchart showing the processing contents of the supply air amount control processing (during heating) performed by the inverter control device shown in FIG. FIG. 6 is a schematic configuration diagram of an air supply amount control system for stores according to the second embodiment of the present invention. FIG. 7 is a schematic configuration diagram of the damper control device shown in FIG. FIG. 8 is a flowchart showing the processing contents of the supply air amount control processing (during heating) performed by the damper control device shown in FIG. 7.

Hereinafter, preferred embodiments of the air supply amount control system for stores according to the present invention will be described in detail with reference to the accompanying drawings.

<Embodiment 1>
FIG. 1 is a schematic configuration diagram of an air supply amount control system for stores according to the first embodiment of the present invention. The air supply amount control system for stores exemplified here includes a ventilation fan 10, an air supply fan 20, an inverter control device 30, a first measurement unit 41, a second measurement unit 42, and a third measurement unit 43. The unit 50 is provided.

The ventilation fan 10 exhausts the exhaust heat discharged from an open showcase (not shown) or the like accumulated in the store to the outside of the store through the exhaust duct 11. The air supply fan 20 takes in outside air into the store through the air supply duct 21. The inverter control device 30 corresponds to the supply air amount control means described in the claims, and the rotation speed of the supply air fan 20 can be arbitrarily changed. For example, when the rotation speed of the air supply fan 20 is increased by the inverter control device 30, the air supply fan air volume increases, the air supply amount taken into the store increases, and the pressure in the store increases. On the other hand, when the rotation speed of the air supply fan 20 is lowered, the air supply amount of the air supply fan decreases, the amount of air supply taken into the store decreases, and the pressure in the store decreases.

The first measurement unit 41 is provided in the store of the convenience store 1 and measures the temperature inside the store (hereinafter referred to as the temperature inside the store C1). The second measuring unit 42 is provided outside the convenience store 1 and measures the outside temperature of the store (hereinafter referred to as the outside temperature C2). The third measuring unit 43 is provided inside the ventilation port 70, and measures the temperature inside the ventilation port (hereinafter referred to as the temperature inside the ventilation port C3).

The input unit 50 inputs a first threshold value (for heating and cooling), a second threshold value (for heating and cooling), and a third threshold value, which will be described later, and is, for example, a keyboard.

FIG. 2 is a graph showing the relationship (during heating) between the air volume of the air supply fan and the temperature inside the store, inside the ventilation port, and outside the store. It can be seen that when the air supply fan air volume is increased while the temperature inside the store and the temperature outside the store are almost constant, the temperature inside the ventilation port gradually increases.

This is because when the inside of the store has a negative pressure, that is, when the air pressure is lower than the outside air pressure, the outside air flows into the store through the ventilation port 70, so that the temperature inside the ventilation port C3 becomes close to the outside temperature of the store, and the inside of the store has a positive pressure, that is, outside the store. When the air pressure is higher than the atmospheric pressure, the air inside the store flows out through the ventilation port 70, so that it can be said that there is a principle that the temperature inside the ventilation port C3 is close to the temperature inside the store. If the air pressure inside the store and the outside air pressure are the same, the temperature C3 inside the ventilation port is approximately an intermediate value between the temperature inside the store and the temperature outside the store.

The graph showing the relationship between the air volume of the air supply fan during cooling and the temperature inside the store, inside the ventilation port, and outside the store is not shown, but since the temperature outside the store is higher than the temperature inside the store during cooling, the air supply is based on the above principle. When the fan air volume is increased, the temperature inside the ventilation port gradually decreases, that is, it approaches the low temperature inside the store. The present invention controls the amount of air supply by using the above principle to keep the inside of the store at a positive pressure.

FIG. 3 is a graph showing the relationship between the air supply fan air volume and the reference temperature difference (during heating). Here, the reference temperature difference (hereinafter referred to as the reference temperature difference Ca) is a numerical value calculated by the following formula. Based on the magnitude of this numerical value, it is determined whether the pressure inside the store is positive or negative, and the air volume of the air supply fan is increased or decreased.

(Calculation formula 1)
Reference temperature difference Ca = Store temperature C1 + Store outside temperature C2-2 x Ventilation port temperature C3
FIG. 4 is a schematic configuration diagram of the inverter control device according to the first embodiment of the present invention. The inverter control device 30 includes a temperature information acquisition unit 31, a temperature difference calculation unit 32, a temperature difference comparison unit 33, an air supply fan rotation speed adjustment unit 34, a threshold value storage unit 35, and an input processing unit 36. It is composed.

The temperature information acquisition unit 31 is configured to be communicable with the first measurement unit 41, the second measurement unit 42, and the third measurement unit 43, which are composed of temperature sensors that measure the temperature using, for example, a thermistor. Then, the temperature information acquisition unit 31 acquires the temperature inside the store C1, the temperature outside the store C2, and the temperature inside the ventilation port C3 as the temperature acquisition results from the first measurement unit 41, the second measurement unit 42, and the third measurement unit 43, respectively. It is something to do.

The temperature difference calculation unit 32 calculates the reference temperature difference Ca by the calculation formula 1 based on the temperature measurement result acquired by the temperature information acquisition unit 31. Further, the temperature difference calculation unit 32 calculates the temperature difference Cb (= | store temperature C1-store outside temperature C2 |) based on the temperature measurement result acquired by the temperature information acquisition unit 31.

The temperature difference comparison unit 33 has a reference temperature calculated by the temperature difference calculation unit 32 with the first threshold value (for heating and cooling) or the second threshold value (for heating and cooling) stored in the threshold value storage unit 35 described later. This is a comparison with the difference Ca. Further, the temperature difference comparison unit 33 compares the third threshold value stored in the threshold value storage unit 35, which will be described later, with the temperature difference Cb inside and outside the store calculated by the temperature difference calculation unit 32.

The supply air fan rotation speed adjusting unit 34 increases the supply air fan rotation speed by a predetermined number when the reference temperature difference Ca is equal to or higher than the first threshold value (during heating) in the comparison result of the temperature difference comparison unit 33 during heating. Is. Further, the supply air fan rotation speed adjusting unit 34 reduces the supply air fan rotation speed by a predetermined number when the reference temperature difference Ca is less than the second threshold value (during heating) in the comparison result of the temperature difference comparison unit 33. be. Further, the supply air fan rotation speed adjusting unit 34 stops the supply air fan if the temperature difference Cb inside and outside the store is less than the third threshold value in the comparison result of the temperature difference comparison unit.

The supply air fan rotation speed adjusting unit 34 increases the supply air fan rotation speed by a predetermined number when the reference temperature difference Ca is equal to or less than the first threshold value (during cooling) in the comparison result of the temperature difference comparison unit 33 during cooling. Is. Further, the supply air fan rotation speed adjusting unit 34 reduces the supply air fan rotation speed by a predetermined number when the reference temperature difference Ca exceeds the second threshold value (during cooling) in the comparison result of the temperature difference comparison unit 33. .. Further, the supply air fan rotation speed adjusting unit 34 stops the supply air fan if the temperature difference Cb inside and outside the store is less than the third threshold value in the comparison result of the temperature difference comparison unit.

The threshold value storage unit 35 stores a first threshold value (for heating and cooling), a second threshold value (for heating and cooling), and a third threshold value. Although it is stored in advance as an initial value, it can be changed from the input unit 50. The input processing unit 36 processes the first threshold value (for heating and cooling), the second threshold value (for heating and cooling) and the third threshold value input from the input unit 50, and stores the value of the threshold value storage unit 35. It is something to rewrite.

FIG. 5 is a flowchart showing the processing contents of the supply air amount control processing (during heating) performed by the inverter control device shown in FIG.

In this air supply amount control process, when the inverter control device 30 acquires temperature information from the first measurement unit 41, the second measurement unit 42, and the third measurement unit 43 through the temperature information acquisition unit 31 (step S1: Yes). ), That is, assuming that the temperature inside the store C1, the temperature outside the store C2, and the temperature inside the ventilation port C3 are acquired, the temperature difference calculation unit 32 carries out a process of calculating the reference temperature difference Ca and the temperature difference Cb inside and outside the store (step S2). ..

Next, the temperature difference comparison unit 33 compares the temperature difference Cb inside and outside the store calculated by the temperature difference calculation unit 32 with the third threshold value (step S3). When the temperature difference Cb inside and outside the store calculated by the temperature difference calculation unit 32 is equal to or greater than the third threshold value (step S3: Yes), the temperature difference comparison unit 33 has the reference temperature difference Ca calculated by the temperature difference calculation unit 32 and the first. Compare with the threshold value (during heating, for example, 1 ° C.) (step S4). On the other hand, if the temperature difference Cb inside and outside the store calculated by the temperature difference calculation unit 32 is less than the third threshold value (step S3: No), a process of stopping the air supply fan is performed (step S9), and then the process is performed. It returns and ends the process.

Next, when the reference temperature difference Ca calculated by the temperature difference calculation unit 32 is equal to or higher than the first threshold value (during heating) (step S4: Yes), the supply air fan rotation speed adjusting unit 34 determines the supply air fan rotation speed. Increase by a predetermined number (step S5). Then, after a lapse of a certain time (step S6: Yes), the process returns to the next temperature information acquisition process (step S1). On the other hand, when the reference temperature difference Ca calculated by the temperature difference calculation unit 32 is less than the first threshold value (during heating) (step S4: No), the temperature difference comparison unit 33 has the reference temperature calculated by the temperature difference calculation unit 32. The difference Ca is compared with the second threshold (during heating, for example, -1 ° C.) (step S7). When the reference temperature difference Ca calculated by the temperature difference calculation unit 32 is less than the second threshold value (during heating) (step S7: Yes), the supply air fan rotation speed adjusting unit 34 reduces the supply air fan rotation speed by a predetermined number. After making it (step S8), the process proceeds to step S6. On the other hand, when the reference temperature difference Ca calculated by the temperature difference calculation unit 32 is equal to or higher than the second threshold value (during heating) (step S7: No), the supply air fan rotation speed adjusting unit 34 returns without performing the increase / decrease process. And end the air supply amount control process. That is, the current rotation speed of the air supply fan is maintained.

Although the flowchart showing the contents of the air supply amount control process during cooling is not shown, the directions of the reference numerals in steps S4 and S7 in FIG. 5 are reversed, and the rest is the same.

As described above, according to the inverter control device according to the first embodiment of the present invention, it is determined whether the pressure inside the store is positive or negative based on the reference temperature difference Ca, and the air supply is increased or decreased by increasing or decreasing the rotation speed of the air supply fan. The amount can be adjusted to keep the inside of the store at a positive pressure.
<Embodiment 2>
FIG. 6 is a schematic configuration diagram of an air supply amount control system for stores according to the second embodiment of the present invention. The air supply amount control system for stores exemplified here is configured to include a damper control device 60 instead of the inverter control device 30 in the configuration of the air supply amount control system of the first embodiment. The same reference numerals are given to the configurations similar to those of the first embodiment other than the damper control device 60, and the description thereof will be omitted.

The damper control device 60 corresponds to the air supply amount control means described in the claims, and by providing a damper 61 in the air supply duct 21, the angle of the damper 61 can be arbitrarily changed. It controls the amount of air supply by increasing or decreasing the duct resistance. For example, if the angle of the damper 61 is parallel to the duct opening surface (0 degrees), the duct opening is closed, and if the angle is perpendicular to the duct opening surface (90 degrees), the duct resistance is zero. It becomes a state. That is, as the duct angle is increased, the duct resistance becomes smaller, so that the amount of air supplied into the store increases and the pressure in the store increases. On the other hand, as the duct angle is reduced, the duct resistance increases, the amount of air supplied into the store decreases, and the amount of pressure in the store decreases.

FIG. 7 is a schematic configuration diagram of the damper control device shown in FIG. The configuration of the damper control device 60 exemplified here is configured to include a damper angle adjusting unit 37 instead of the supply air fan rotation speed adjusting unit 34 of the inverter control device 30 in the first embodiment. The same reference numerals are given to the configurations similar to those of the first embodiment other than the damper angle adjusting unit 37, and the description thereof will be omitted.

FIG. 8 is a flowchart showing the processing contents of the supply air amount control processing (during heating) performed by the damper control device shown in FIG. 7.

In this air supply amount control process, the damper control device 60 acquires temperature information from the first measurement unit 41, the second measurement unit 42, and the third measurement unit 43 through the temperature information acquisition unit 31 (step S11: Yes). ), That is, assuming that the temperature inside the store C1, the temperature outside the store C2, and the temperature inside the ventilation port C3 are acquired, the temperature difference calculation unit 32 carries out a process of calculating the reference temperature difference Ca and the temperature difference Cb inside and outside the store (step S21). ..

Next, the temperature difference comparison unit 33 compares the temperature difference Cb inside and outside the store calculated by the temperature difference calculation unit 32 with the third threshold value (step S31). When the temperature difference Cb inside and outside the store calculated by the temperature difference calculation unit 32 is equal to or greater than the third threshold value (step S31: Yes), the temperature difference comparison unit 33 has the reference temperature difference Ca calculated by the temperature difference calculation unit 32 and the first. Compare with the threshold value (during heating) (step S41). On the other hand, if the temperature difference Cb inside and outside the store calculated by the temperature difference calculation unit 32 is less than the third threshold value (step S31: No), a process of stopping the air supply fan is performed (step S91).

Next, when the reference temperature difference Ca calculated by the temperature difference calculation unit 32 is equal to or greater than the first threshold value (during heating) (step S41: Yes), the damper angle adjusting unit 37 increases the damper angle by a predetermined angle (step). S51). Then, after a lapse of a certain period of time (step S61: Yes), the process returns to the next temperature information acquisition process (step S11). On the other hand, when the reference temperature difference Ca calculated by the temperature difference calculation unit 32 is less than the first threshold value (during heating) (step S41: No), the temperature difference comparison unit 33 has the reference temperature calculated by the temperature difference calculation unit 32. The difference Ca and the second threshold value (during heating) are compared (step S71). When the reference temperature difference Ca calculated by the temperature difference calculation unit 32 is less than the second threshold value (during heating) (step S71: Yes), the damper angle adjusting unit 34 reduces the damper angle by a predetermined angle (step S81). On the other hand, when the reference temperature difference Ca calculated by the temperature difference calculation unit 32 is equal to or higher than the second threshold value (during heating) (step S71: No), the damper angle adjusting unit 34 returns without changing the damper angle. And ends the air supply amount control process. That is, the current damper angle is maintained.

Although the flowchart showing the contents of the air supply amount control process during cooling is not shown, the directions of the reference numerals in step S41 and step S71 in FIG. 8 are reversed, and the rest is the same.

As described above, according to the damper control device according to the second embodiment of the present invention, it is determined whether the pressure inside the store is positive or negative by the reference temperature difference Ca, and the damper angle is changed to increase or decrease the duct resistance. The amount of air supply can be adjusted to keep the inside of the store at a positive pressure.

Although the preferred embodiments 1 and 2 of the present invention have been described above, the present invention is not limited to these, and any device can be modified and can control the amount of air supply. Such a control device may be used.

10 Ventilation fan 20 Air supply fan 30 Inverter control device 31 Temperature information acquisition unit 32 Temperature difference calculation unit 33 Temperature difference comparison unit 34 Supply air fan rotation speed adjustment unit 35 Threshold storage unit 36 Input processing unit 37 Damper angle adjustment unit 41 First measurement Unit 42 2nd measurement unit 43 3rd measurement unit 50 Input unit 60 Damper control device

Claims (5)

Ventilation means to discharge the air inside the store to the outside of the store, air supply means to supply the outside air to the inside of the store, temperature detection means inside the store to detect the temperature inside the store, and outside the store to detect the outside air temperature outside the store. When the temperature inside the store is lower than the pressure outside the store by communicating with the temperature detecting means inside and outside the store, the outside air flows into the store and the temperature inside the store becomes closer to the temperature outside the store. When the positive pressure is higher than the pressure outside the store, it is installed in the ventilation port where the temperature inside the store is close to the temperature inside the store due to the outflow of the air inside the store, and the temperature inside the ventilation port is detected. When, and a supply amount control means for controlling the air charge supplying outside air into the store by the air supply means, the air supply amount control means, a reference from the temperature information collected from each of the temperature sensing means An air supply amount control system for stores, which is characterized by calculating a temperature difference and controlling the air supply amount based on the reference temperature difference to keep the inside of the store at a positive pressure. The air supply amount control system for stores according to claim 1, wherein the reference temperature difference is calculated from the following formula.
(Calculation formula): Reference temperature difference = In-store temperature + Out-of-store temperature-2 x Ventilation port temperature The supply for a store according to claim 1 or 2, wherein the air supply amount control means stops the air supply means when the difference between the temperature inside the store and the temperature outside the store is less than the third threshold value. Air volume control system. The air supply amount control system for stores according to any one of claims 1 to 3, wherein the air supply amount control means is an inverter control device. The air supply amount control system for stores according to any one of claims 1 to 3 , wherein the air supply amount control means is a damper control device.

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