JP2001201232A - Brine show case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brine show case for the objective of saving energy by preventing wasteful cooling. SOLUTION: A circular brine supply pipe 1 is arranged to supply a liquid to coolers 2, 2, 2, and so on of a show case, a transport pump 3 to supply in circulation the liquid in the brine supply pipe 1 and an outdoor heat exchanger 4 to cool the liquid. The outdoor heat exchanger 4 is made to be exposed directly to the outside air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brine showcase that exchanges heat with a liquid, that is, brine.

[0002]

2. Description of the Related Art Conventionally, as a showcase of this type, Japanese Patent Application Laid-Open No. H10-274463 (F25D17 / 02) discloses a cooling system using brine in which a plurality of showcases are cooled using brine. A primary circuit in which a closed circuit includes a blusher unit, a primary forward path through which brine flowing out of the boiler unit and a primary return path through which brine flows into the boiler unit, and A secondary pump provided in each of the showcases, for taking brine from the primary forward path and flowing it to a heat exchanger, and a secondary return path for returning the brine from the heat exchanger to the primary return path. A cooling system using a brine including a secondary circuit having a return path is disclosed.

[0003] An antifreeze obtained by mixing propylene glycol, ethylene glycol, ethanol, or the like with water is used as the brine for this cooling system.

[0004]

In the prior art as described above, when cooling the showcase, the brine is always cooled by the brinkler unit.

[0005] For this reason, even when the outside air temperature is low and becomes 0 ° C or less, a refrigerator for cooling the brine chiller unit must be operated, and wasteful cooling is performed.

The present invention has been made in view of the above-described problems, and provides a brine showcase for preventing wasteful cooling and conserving energy.

[0007]

According to a first aspect of the present invention, as a means for achieving the above object, a showcase is cooled by using a liquid. An annular brine supply pipe that supplies liquid to the air supply, a transport pump that circulates and supplies the liquid in the brine supply pipe, and an outdoor heat exchanger that cools the liquid, and the outdoor heat exchanger is directly exposed to outside air. A brine showcase characterized by being in a state is provided.

As described above, since the outdoor heat exchanger is directly exposed to the outside air, the liquid inside the brine supply pipe is cooled without using a cooler (brush chiller) in a cold region in winter or the like. Energy can be saved without unnecessary cooling.

According to the second aspect of the present invention, in addition to the first aspect,
The number of revolutions of the blower of the heat exchanger is changed according to the temperature of the liquid outdoor heat exchanger outlet.

As described above, by changing the rotation speed of the blower of the heat exchanger according to the temperature of the liquid outdoor heat exchanger outlet,
A sudden change in the outside temperature does not significantly affect the liquid in the brine supply pipe, and the stable cooling of the showcase can be performed.

According to the third aspect of the present invention, in addition to the first aspect,
In the brine supply pipe, a bypass pipe and a solenoid valve for opening and closing the bypass pipe are provided in parallel with the outdoor heat exchanger, and the solenoid valve is controlled by the temperature of the liquid outdoor heat exchanger outlet.

By controlling the solenoid valve based on the liquid outdoor heat exchanger outlet temperature in this manner, it is possible to prevent the temperature of the liquid in the brine supply pipe from unnecessarily lowering.

According to the fourth aspect of the present invention, in addition to the first aspect,
In the brine supply pipe, a blincher and an outside air temperature sensor for measuring the outside air temperature are provided in parallel with the outdoor heat exchanger.

As described above, by providing the blincher in parallel with the outdoor heat exchanger and providing the outside air temperature sensor for measuring the outside air temperature, when the outside air temperature is high, cooling is performed by the blincher and the outside air temperature is reduced. When the temperature is low, cooling can be performed by the outdoor heat exchanger, and energy can be saved.

According to a fifth aspect of the present invention, in addition to the first aspect,
In the brine supply pipe, a blincher and an outside air temperature sensor for measuring the outside air temperature are provided in series with the outdoor heat exchanger.

By providing the blincher in series with the outdoor heat exchanger in this manner, cooling is basically performed by the outdoor heat exchanger, and cooling of the insufficient portion by the outdoor heat exchanger is performed. The operation is performed by a blincher, which requires only the minimum required cooling and saves energy.

In the invention of claim 6, in addition to claim 5,
A second bypass pipe that does not pass through the outdoor heat exchanger is formed.

By forming the second bypass pipe that does not pass through the outdoor heat exchanger in this way, when the outside air temperature is high in summer or the like, the brine supply pipe is not passed through the outdoor heat exchanger and is not supplied through the outdoor heat exchanger. Cooling can be performed.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cooling circuit of the first embodiment, FIG. 2 shows a cooling circuit of the second embodiment, FIG. 3 shows a cooling circuit of the third embodiment, and FIG. 4 shows a cooling circuit of the fourth embodiment.

In the first embodiment shown in FIG. 1, reference numeral 1 denotes a brine supply pipe for supplying a liquid (brine) into the inside, and a plurality of showcase coolers 2, 2, 2,... A heat exchanger 4 and the like are provided in an annular shape, and the brine is circulated in the brine supply pipe 1 by the transport pump 3. Further, the outdoor heat exchanger 4 is provided in a state of being directly exposed to the outside air, and the brine is cooled by the outside air.
Here, in order to promote cooling, the outdoor heat exchanger 4 is provided with a blower 5. The cooled brine cools the air around the coolers 2, 2, 2,... Of the showcases installed in a plurality of stores or the like. The coolers 2, 2, 2,... Are basically connected in parallel.

Here, near the outlet of the outdoor heat exchanger 4,
A temperature sensor 6 for measuring the temperature of the brine near the outlet of the outdoor heat exchanger 4 is provided, and the temperature of the temperature sensor 6 and the coolers 2, 2, 2,. Preset temperature (for example, 3
), And the rotation speed of the blower 5 is changed.

That is, when the outside air temperature is substantially the same as the predicted temperature, and the liquid outdoor heat exchanger outlet temperature T11 is equal to the liquid set temperature T12, the rotation speed of the blower 5 is kept as it is, and High, when T11 is higher than T12, the rotation speed of the blower 5 is increased, and conversely, the outside air temperature is lower than the predicted temperature, and when T11 is lower than T12, the rotation speed of the blower 5 is reduced, and still lower. In this case, the blower 5 is stopped.

As described above, since the outdoor heat exchanger is directly exposed to the outside air, the liquid inside the brine supply pipe is cooled without using a cooling device such as a blincher in winter in a cold region. Energy can be saved without unnecessary cooling. Also, by changing the rotation speed of the blower of the heat exchanger according to the temperature of the liquid outdoor heat exchanger outlet, sudden changes in the outside air temperature do not significantly affect the liquid inside the brine supply pipe, and the showcase Stable cooling can be performed.

In the second embodiment shown in FIG. 2, reference numeral 10 denotes a brine supply pipe for supplying a liquid (brine) to the inside, a plurality of showcase coolers 2, 2, 2,... The exchanger 4 and the like are provided in a ring shape,
A bypass pipe 7 for bypassing the outdoor heat exchanger 4 is provided. The bypass pipe 7 is provided with an electric valve 8 for adjusting a flow rate of the bypass pipe 7. Here, the flow resistance in the bypass pipe 7 is smaller than the flow resistance in the outdoor heat exchanger 4, and the flow rate of the outdoor heat exchanger 4 can be adjusted by adjusting the opening of the electric valve 8. In particular,
If the flow rate of the outdoor heat exchanger 4 cannot be controlled only by the electric valve 8, an electric valve whose opening degree is opposite to that of the electric valve 8 is provided near the entrance of the outdoor heat exchanger 4, and the flow rate of the outdoor heat exchanger 4 is Need to be adjusted.

Here, the temperature of the temperature sensor 6 provided near the outlet of the outdoor heat exchanger 4 and the temperature of the cooler 2,
The opening of the motor-operated valve 8 is adjusted by comparing the temperature with a preset temperature (for example, 3 degrees) suitable for cooling 2, 2,....

That is, when the outside air temperature is substantially the same as or higher than the predicted temperature, and the liquid outdoor heat exchanger outlet temperature T21 is equal to or higher than the liquid set temperature T22, the electric valve 8 is closed and, conversely, the predicted temperature is lower than the predicted temperature. Outside temperature is low, T21 is T
If it is lower than 22, the opening of the motor-operated valve 8 is adjusted. If it is still lower, the opening of the motor-operated valve 8 is fully opened, and the brine is not completely flown into the outdoor heat exchanger 4. Prevent cooling completely.

As described above, by controlling the solenoid valve based on the liquid outdoor heat exchanger outlet temperature, it is possible to prevent the temperature of the liquid in the brine supply pipe from unnecessarily lowering.

In the third embodiment shown in FIG. 3, reference numeral 20 denotes a brine supply pipe for supplying a liquid (brine) into the inside, a plurality of showcase coolers 2, 2, 2,... The exchanger 4 and the like are provided in a ring shape,
A bypass pipe 11 that bypasses the outdoor heat exchanger 4 is provided. The bypass pipe 11 is provided with a blincher 12 for cooling brine and an electric valve 13 for adjusting a flow rate of the bypass pipe 11. Have been. Also,
In the vicinity of the entrance of the outdoor heat exchanger 4, a motor-operated valve 13 for adjusting the flow rate to the outdoor heat exchanger 4 and a motor-operated valve 14 whose opening is opposite to that of the motor-operated valve 13 are provided. The opening of these electric valves 13 and 14 is adjusted by an outside air temperature sensor 15 for measuring the outside air temperature.

Here, an outside air temperature sensor 1 for measuring the outside air temperature
5 and a preset temperature suitable for cooling the coolers 2, 2, 2...
), The opening of the motor-operated valves 13 and 14 is adjusted.

That is, the temperature T3 predicted by the outside air temperature T33
If it is higher than 2, the motor-operated valve 13 is opened according to the difference, the brine is cooled by the blincher 12, and the motor-operated valve 14 is closed by an amount corresponding to the opening of the motor-operated valve 13. Conversely, when the outside temperature T33 is lower than the predicted temperature T32,
The electric valve 13 is closed according to the difference and the electric valve 13 is closed.
The motor-operated valve 14 is opened by the amount that is closed. If the difference is large, the motorized valve 13 is completely closed and the motorized valve 14 is closed.
Is fully opened, and when there is a further difference, it is possible to cope by reducing the rotation speed of the blower 5 as in the first embodiment or by providing a bypass pipe 7 or the like as in the second embodiment. it can.

As described above, by providing the blincher in parallel with the outdoor heat exchanger and providing the outside air temperature sensor for measuring the outside air temperature, when the outside air temperature is high, cooling is performed by the blincher and the outside air is cooled. When the temperature is low, cooling can be performed by the outdoor heat exchanger, and energy can be saved.

In the fourth embodiment shown in FIG. 4, a reference numeral 30 denotes a brine supply pipe for supplying a liquid (brine) to the inside, a plurality of showcase coolers 2, 2, 2,... The heat exchanger 4, the blusher 12, and the like are provided in an annular shape, and a bypass pipe 21 that bypasses the outdoor heat exchanger 4 is provided. The bypass pipe 21 is electrically operated to adjust the flow rate of the bypass pipe 21. A valve 22 is provided, and an electric valve 23 for adjusting the flow rate to the outdoor heat exchanger 4 is provided.
Has the opposite opening. These electric valves 22 and 23 are provided with an outside air temperature sensor 15 for measuring the outside air temperature and a temperature sensor 24 for measuring the temperature of the brine in the brine supply pipe 30.
The opening is adjusted by.

Here, the outside air temperature sensor 1 for measuring the outside air temperature
5 and the temperature of the temperature sensor 24 are compared with a preset set temperature (for example, 3 degrees) suitable for cooling the coolers 2, 2, 2,.
The degree of opening is adjusted.

That is, the temperature T4 predicted by the outside air temperature T43
If it is higher than 2, the electric valve 22 is opened according to the difference, the outdoor heat exchanger 4 is bypassed, the brine is cooled by the blincher 12, and the electric valve 23 is closed as much as the electric valve 22 is opened. . Conversely, when the outside air temperature T43 is lower than the predicted temperature T42, the operation of the brush chiller 12 is stopped, and the electric valves 22 and 23 are operated according to the difference.
Control the opening and closing of If the difference is further large, only the electric valve 22 is opened to prevent cooling by the outdoor heat exchanger 4.

As described above, by providing the blincher in series with the outdoor heat exchanger, cooling is basically performed by the outdoor heat exchanger, and cooling of the insufficient part by the outdoor heat exchanger. Is performed by a blincher, so that only minimum cooling is required and energy can be saved. Also,
By forming the second bypass pipe that does not pass through the outdoor heat exchanger, it is possible to cool the brine supply pipe with a blincher without passing through the outdoor heat exchanger when the outside temperature is high in summer or the like. .

[0037]

As described in detail above, in claim 1,
The outdoor heat exchanger is exposed directly to the outside air, so it can be used as a cooler (brinchler) in winter in cold regions.
The cooling of the liquid inside the brine supply pipe can be performed without using the liquid, and energy can be saved without performing unnecessary cooling.

According to the second aspect of the present invention, by changing the rotation speed of the blower of the heat exchanger according to the temperature of the liquid outdoor heat exchanger outlet, the liquid inside the brine supply pipe is protected against a sudden change in the outside air temperature. Has little effect and can provide stable cooling of the showcase.

According to the third aspect of the present invention, the temperature of the liquid in the brine supply pipe can be prevented from lowering more than necessary by controlling the solenoid valve based on the temperature of the liquid at the outdoor heat exchanger outlet.

According to the fourth aspect of the present invention, a blincher is provided in parallel with the outdoor heat exchanger, and an outside air temperature sensor for measuring the outside air temperature is provided. When the outside air temperature is low, cooling can be performed by the outdoor heat exchanger, and energy can be saved.

According to the fifth aspect of the present invention, since the blincher is provided in series with the outdoor heat exchanger, the cooling is basically performed by the outdoor heat exchanger and the shortage of the outdoor heat exchanger occurs. The cooling of those parts is performed by a blincher, which requires only the minimum required cooling and energy savings.

According to the sixth aspect of the present invention, by forming the second bypass pipe which does not pass through the outdoor heat exchanger,
When the outside air temperature is high in summer or the like, the brine supply pipe can be cooled by a blincher without passing through the outdoor heat exchanger.

[Brief description of the drawings]

FIG. 1 is a cooling circuit of a first embodiment.

FIG. 2 is a cooling circuit of a second embodiment.

FIG. 3 is a cooling circuit of a third embodiment.

FIG. 4 is a cooling circuit according to a fourth embodiment.

[Description of Signs] 1 Brine supply pipe 2 Showcase cooler 3 Conveyance pump 4 Outdoor heat exchanger 5 Blower 6 Temperature sensor 10 Brine supply pipe 12 Brineller 15 Outside air temperature sensor 20 Brine supply pipe 30 Brine supply pipe

Claims (6)

[Claims] 1. A brine showcase configured to cool a showcase using liquid, an annular brine supply pipe for supplying liquid to a cooler of the showcase,
A brine showcase comprising a transport pump for circulating and supplying the liquid in the brine supply pipe and an outdoor heat exchanger for cooling the liquid, wherein the outdoor heat exchanger is directly exposed to the outside air. 2. The brine showcase according to claim 1, wherein the rotation speed of the blower of the heat exchanger is changed according to the temperature of the liquid outdoor heat exchanger outlet. 3. A bypass pipe and a solenoid valve for opening and closing the bypass pipe are provided in the brine supply pipe in parallel with the outdoor heat exchanger, and the solenoid valve of the bypass pipe is controlled by the temperature of the liquid outdoor heat exchanger outlet. 2. The brine showcase of claim 1, wherein: 4. The brine showcase according to claim 1, further comprising a blincher and an outside air temperature sensor for measuring an outside air temperature in the brine supply pipe in parallel with the outdoor heat exchanger. 5. The brine showcase according to claim 1, further comprising a blincher and an outside air temperature sensor for measuring an outside air temperature in series with the outdoor heat exchanger in the brine supply pipe. 6. The brine showcase according to claim 5, wherein a second bypass pipe that does not pass through the outdoor heat exchanger is formed.