JP2010203740A - Method for operating showcase - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for operating a showcase, further saving energy by performing control suitable for a two-layer air curtain system, in an open showcase having a cooling structure using the two-layer air curtain system. <P>SOLUTION: In this method for operating the open showcase cooling the inside of a display chamber 4 by a two-layer air curtain, air distribution from an inner layer fan 8 is controlled to be lower in a time zone with a load on the showcase 1 reduced, acquired from predetermined season information and time information. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for operating a showcase, and more particularly to a method for operating a showcase that cools a display room using a two-layer air curtain system including an outer layer air curtain and an inner layer air curtain.

  As an open showcase with the front of the display room opened, it passes through the outer layer duct and the inner layer duct provided at the lower, rear, and upper parts of the display room, and downward from the outer layer outlet and the inner layer outlet provided at the upper front end of the display room. Covering the front opening of the display chamber with a two-layer air curtain of cool air that is blown out toward each other and sucked into the outer layer suction port and the inner layer suction port provided at the lower front end of the display chamber and circulated to the lower part of the display chamber A two-layer air curtain type open showcase for cooling the display room is known.

  In an open showcase with such a double-layer air curtain cooling structure, the fan speed is controlled in accordance with the refrigeration operation mode and the refrigeration operation mode, and the wind speed balance of the air curtain blown out from the outlet is optimized. (For example, refer to Patent Document 1).

JP 11-183013 A

  As mentioned above, it is possible to improve the cooling efficiency by optimizing the air curtain wind speed balance, but the energy saving is the same as a general showcase, for example, when the interior lighting is turned off Employs energy-saving operation such as lowering the fan speed, and no special consideration was given to the double-layer air curtain system.

  Therefore, an object of the present invention is to provide a showcase operating method capable of achieving a further energy saving effect by performing control suitable for the two-layer air curtain system.

  In order to achieve the above object, according to the method of operating the showcase of the present invention, a display chamber having a front surface is formed in a main body constituted by a heat insulating wall, and outer layers provided at a lower portion, a rear portion, and an upper portion of the display chamber. Passed through the duct, blown by the outer layer fan provided in the outer layer duct and blown downward from the outer layer outlet provided on the outside of the upper front end of the display room, provided on the outer side of the lower front end of the display room When the outer layer air curtain sucked into the outer layer suction port and the inner layer duct provided inside the outer layer duct at the lower part, rear part and upper part of the display room are cooled by the cooler provided in the inner layer duct. Both of them are blown by an inner layer fan, blown downward from an inner layer outlet provided inside the upper front end of the display chamber, and sucked into an inner layer suction port provided inside the lower front end of the display chamber. In an open showcase operation method in which the display room is cooled by a two-layer air curtain provided with the above-mentioned, the inner-layer fan is sent during a time period when the load on the showcase obtained from preset season information and time information is low. It is characterized by controlling the air volume low.

  In the showcase operation method of the present invention, in addition to the control, the control to reduce the air flow rate of the inner layer fan refers to the environmental information of the surroundings where the showcase is installed, and the cooling before and after the cooler. When the difference between the previous air temperature and the air temperature after cooling is smaller than a preset temperature difference, or when the temperature of the refrigerant inlet pipe of the cooler is higher than a preset temperature, Performed when the internal pressure of the cooler is higher than a preset pressure, or the number of times the solenoid valve provided in the refrigerant supply pipe of the cooler is opened and closed within a preset time Can be done at less time.

  According to the operation method of the showcase of the present invention, the cooling amount by the inner layer air curtain can be controlled to an optimum state without impairing the shielding effect by the outer layer air curtain, and energy saving can be achieved. For example, by controlling the air flow rate of the inner layer fan at a low load such as in winter, the energy of the inner layer fan can be reduced, the heat exchange amount of the cooler can be reduced, and the energy consumption of the refrigerator can be reduced. Keeping the air flow constant does not impair the effect of shutting off the outside air by the air curtain, and protects the cool air flow in the display room, so it is possible to save energy by suppressing unnecessary cold air diffusion to the outside air and rising product temperature. Occurrence can also be suppressed.

It is a cross-sectional side view which shows one example of an open showcase which can apply the driving method of the showcase of this invention.

  A two-layer air curtain type open showcase 1 is formed with a multistage display chamber 4 having an open front in a main body 3 constituted by a heat insulating wall 2, and an outer layer duct 5 at the lower, rear and upper portions of the main body 3. An inner layer duct 6 is provided, an outer layer fan 7 and an inner layer fan 8 for circulating cold air in each duct 5, 6 are provided, and a cooler 9 is provided in the inner layer duct 6.

  The upper front end portion of the main body 3 is provided with an outer layer outlet 10 on the outer side and an inner layer outlet 11 on the inner side over the entire longitudinal direction of the case, and the lower front end portion of the main body 3 has an outer layer suction on the outer side. The mouth 12 is provided with an inner layer suction port 13 on the inner side thereof over the entire longitudinal direction of the case. The outer layer airflow blown by the outer layer fan 7 is rectified and blown downward from the outer layer outlet 10 through the upper part of the outer layer duct 5, and sucked into the lower part of the outer layer duct 5 from the outer layer inlet 12 and circulates. The inner layer air flow blown by the inner layer fan 8 is cooled by the cooler 9, then rectified and blown downward from the inner layer outlet 11 through the upper part of the inner layer duct 6, and is blown out from the inner layer inlet 13. It is sucked into the bottom and circulates.

  The outer layer airflow blown out from the outer layer outlet 10 and the inner layer airflow blown out from the inner layer outlet 11 form an air curtain that doublely covers the opening of the display chamber 4 and cool the inside of the display chamber 4. I have to. In addition, the outer layer airflow that circulates through the outer layer duct 5, the outer layer outlet 10, and the outer layer inlet 12 forms an outer layer air curtain acts as a heat insulating layer for the inner layer airflow, and the inner layer airflow in the display chamber 4 due to the outside air blocking effect ( The cooling effect in the display room 4 by the inner layer airflow is improved by protecting the cold airflow) and suppressing the diffusion of the cold air to the outside air and the rise in the product temperature.

  In the two-layer air curtain type open showcase 1 formed in this way, in this embodiment, the season information and time information set in advance by the control unit, the ambient temperature at which the showcase is installed, Environmental information such as humidity, the temperature difference between the temperature before cooling of the inner layer airflow measured on the inlet side of the cooler 9 and the temperature after cooling of the inner layer airflow measured on the outlet side of the cooler 9, the refrigerant of the cooler 9 The number of revolutions of the inner layer fan 8 with reference to the refrigerant inlet temperature measured in the inlet pipe, the internal pressure of the cooler 9, and the number of times of opening and closing the solenoid valve provided in the refrigerant supply pipe of the cooler 9, That is, the amount of blown air is controlled.

First, basically, the capacity and the number of installed inner fans 8 are set so that a sufficient air flow rate can be obtained during the daytime hours in summer when the load on the showcase 1 is the largest. The air volume is set to the maximum air volume. And in the season and time zone when the load of the showcase 1 is low, the air flow rate of the inner layer fan 8 is controlled to be low according to the required cooling amount of the display room 4. For example, the rate of load change in the four seasons of the day and night in a two-layer air curtain multi-case for fresh meat fish is generally as follows, assuming that the daytime in summer is 100.
Summer Midterm Winter Daytime 100 71 52
Nighttime 55 42 27

  Therefore, based on the season information and the time information, the air volume of the inner layer fan 8 is controlled to be reduced by a predetermined amount with respect to the daytime in the summer, thereby suppressing the power consumption of the inner layer fan 8 in the season and time. Necessary and sufficient cooling capacity corresponding to the load of the showcase 1 that changes together can be obtained. For example, the rotation speed of the inner layer fan 8 is reduced by 20% in the summer night when the night cover is used compared to the fan speed in the summer daytime, and by 20% in the intermediate and winter daytime. By reducing by 30% at night when the night cover is used, a predetermined cooling operation can be performed while saving energy of the refrigerator as well as the inner layer fan 8 without adversely affecting the cooling performance. In addition, control of the air volume of the inner layer fan 8 can also be performed by controlling the number of operating units when a plurality of inner layer fans 8 are installed, but normally, the rotational speed of the inner layer fan 8 is controlled by inverter control. By adjusting, the air volume of the inner layer fan 8 can be easily controlled.

  In addition, the cooling load of the showcase 1 varies greatly depending on the season and time (during business / non-business), but the cooling load also varies greatly depending on the ambient temperature and environment around which the showcase 1 is installed. For example, whether it is close to the doorway to the outside or away from the doorway is a big factor in the load change, and changes in the amount of products purchased in the morning, afternoon, evening, and the frequency of product replacement also affect the load change. Therefore, more efficient cooling and energy saving operation can be performed by correcting the air flow rate of the inner layer fan 8 according to the surrounding environmental information.

  Further, when the load on the showcase 1 is small and the temperature in the display chamber 4 hardly rises, the cooling operation for supplying the low-temperature and low-pressure refrigerant to the cooler 9 by opening the electromagnetic valve is reduced, and the interval of the cooling operation And the ambient temperature of the cooler 9 becomes higher than that during the cooling operation. Therefore, the temperature of the inner layer airflow measured on the inlet side of the cooler 9 and the inner layer airflow measured on the outlet side of the cooler 9 are measured. The temperature difference from the temperature after cooling becomes small. Therefore, the temperature difference before and after the cooler of the inner layer airflow is calculated, and when the calculated temperature difference becomes smaller than the preset temperature difference, the blowing amount of the inner layer fan 8 is reduced, and when the temperature difference becomes larger By increasing the amount of air blown from the inner layer fan 8, efficient energy-saving operation can be performed regardless of the season or time zone.

  Similarly, the temperature of the refrigerant inlet pipe of the cooler 9 gradually increases because the time during which the low-temperature and low-pressure refrigerant does not flow increases, so the temperature of the refrigerant inlet pipe is measured, and the measured temperature of the refrigerant inlet pipe is Efficient energy-saving operation can also be performed by reducing the air flow rate of the inner layer fan 8 when the temperature becomes higher than the set temperature.

  Further, the internal pressure of the cooler 9 also gradually increases because the low-temperature and low-pressure refrigerant does not flow. Therefore, the internal pressure of the cooler 9 is measured, and the measured internal pressure of the cooler 9 is a preset pressure. Efficient energy-saving operation can also be performed by reducing the amount of air blown from the inner layer fan 8 when it becomes higher.

  In addition, since the number of times the solenoid valve is opened also decreases, the number of times the solenoid valve is opened and closed within a preset time is measured. When the measured number of times the solenoid valve is opened and closed is less than the preset number, the inner layer fan 8 Efficient energy-saving operation can also be performed by reducing the amount of blown air.

  Thus, in addition to the control by season and time zone, the temperature difference before and after cooling of the cooler 9 of the inner layer airflow, the temperature of the refrigerant inlet pipe of the cooler 9, the internal pressure of the cooler 9, the number of times the solenoid valve is opened and closed, etc. By appropriately selecting and combining the controls, it is possible to perform an energy saving operation corresponding to the temperature change in the display room 4 due to the change in the product purchase amount and the product replacement frequency.

  When the air flow rate of the inner layer fan 8 is controlled as described above, by keeping the air flow rate of the outer layer fan 7 constant, even if the air flow rate of the inner layer fan 8 changes, the outside air blocking effect by the air curtain is impaired. Because it can protect the cool air flow in the display room 4, it can save energy while suppressing the diffusion of useless cool air from the inner layer air flow to the outside air and the rise of the product temperature, and also suppress the occurrence of cold aisle. Can do.

DESCRIPTION OF SYMBOLS 1 Open showcase 2 Heat insulation wall 3 Main body 4 Display room 5 Outer layer duct 6 Inner layer duct 7 Outer layer fan 8 Inner layer fan 9 Cooler 10 Outer layer outlet 11 Inner layer outlet 12 Outer layer inlet 13 Inner layer inlet

Claims (6)

A display chamber having a front opening is formed in a main body constituted by a heat insulating wall, passes through outer layer ducts provided at the lower part, rear part and upper part of the display room, and is blown by an outer layer fan provided in the outer layer duct. The outer layer air curtain that is blown downward from the outer layer outlet provided outside the upper front end of the display chamber and sucked into the outer layer inlet provided outside the lower front end of the display chamber, and the lower and rear portions of the display chamber And the inner layer duct provided on the inner side of the upper outer layer duct, cooled by a cooler provided in the inner layer duct, and blown by the inner layer fan, provided inside the upper front end of the display chamber. Opening that cools the display chamber by a two-layer air curtain having an inner layer air curtain that is blown downward from the inner layer outlet and sucked into an inner layer suction port provided inside the lower front end of the display chamber In the method of operating a showcase,
A showcase operating method, wherein the air flow rate of the inner layer fan is controlled to be low during a time period when the load on the showcase obtained from preset season information and time information is low. 2. The method of operating a showcase according to claim 1, wherein the control for reducing the air volume of the inner layer fan is performed with reference to environmental information around the showcase. The control to reduce the air flow rate of the inner layer fan is performed when the difference between the airflow temperature before and after the cooler before and after cooling and the airflow temperature after cooling is smaller than a preset temperature difference. The showcase driving method according to claim 1 or 2. The show according to any one of claims 1 to 3, wherein the control for reducing the air flow rate of the inner layer fan is performed when the temperature of the refrigerant inlet pipe of the cooler is higher than a preset temperature. How to drive the case. The operation of the showcase according to any one of claims 1 to 4, wherein the control for reducing the air flow rate of the inner layer fan is performed when the internal pressure of the cooler is higher than a preset pressure. Method. The control to reduce the air flow rate of the inner layer fan is performed when the number of times of opening and closing the electromagnetic valve provided in the refrigerant supply pipe of the cooler is less than the preset number within a preset time. The method for driving a showcase according to claim 1, wherein:

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