JPH0623895Y2 - Temperature / humidity controller - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention provides a storage room in which fresh foods are stored at a desired temperature.
The present invention relates to a temperature / humidity control device for controlling humidity, and more particularly to a warming device for reheating and rehumidifying, and a temperature / humidity controlling device without a humidifier.

[Prior Art] It is necessary to supply high humidity and low temperature air with high relative humidity to a storage room where fresh foods and the like are stored.

However, in general, when the temperature and humidity of the air can change at the same time, when the air is rapidly cooled by a cooler having a cooling temperature equal to or lower than the dew point temperature, water exceeding the saturated water vapor density in the air condenses into water droplets. Adhere to the cooler.

Therefore, in the conventional refrigerant direct expansion type air cooling device used as a cooling device that supplies high humidity and low temperature air to the storage chamber, the air in the storage chamber guided by the duct is strongly cooled by the air cooler, and then again. The cooled air is returned to the storage room, and the temperature of the entire storage room is lowered by exchanging heat with the remaining air in the storage room 1.

However, in this method, too, the air cooler dehumidifies more than necessary for the above reason, and the storage room has dry cooling air whose absolute humidity is extremely low. Therefore, in order to compensate for this inconvenience in these devices, by returning the air strongly cooled by the air cooler to the storage room after being humidified by the humidifier while being heated again by the warmer such as an electric heater, I try to get conditioned air with temperature and humidity.

[Problems to be solved by the invention] As described above, in the related art, a reheater, a warmer for rehumidification, and a humidifier are used to obtain low-temperature, high-humidity air. Yes, it increases the cost of the device and
There is a problem that more energy is required for reheating and rehumidifying, and efficient air conditioning cannot be performed.

Therefore, the present invention has been proposed in order to solve such a conventional problem, and it is not necessary to add a reheater and a reheater for heating or rehumidifying to the device, and it is possible to efficiently and desirably It is an object of the present invention to provide a temperature / humidity control device capable of producing low temperature / high humidity conditioned air.

[Means for Solving the Problems] In order to achieve this object, the temperature / humidity control device of the present invention is provided with an expansion valve following a condenser in a discharge pipe from a compressor, and further connected to an air cooler. , An air cooler is connected to the compressor by a suction pipe to form a refrigeration circuit, and a blower and the air cooler are provided in a circulation passage of air passing through the cold insulation chamber to substantially change the air temperature in the cold insulation chamber. A temperature sensor for detecting is provided in the circulation passage, the rotation speed of the blower is controlled based on a detection output from the temperature sensor, and a dew point temperature sensor for detecting an air dew point temperature in the cool chamber is provided in the air circulation passage. In addition, a pressure sensor is provided in the middle of the suction pipe, and the valve opening degree of the control valve provided in the suction pipe to the compressor is based on the detection output from the dew point temperature sensor and the detection output from the pressure sensor. To be controlled did.

[Operation] By controlling the number of revolutions of the blower based on the detection output of the temperature sensor, the capacity of the air cooler is controlled, so that the fluctuation of the heat load in the cold insulation chamber can be compensated. Thereby, the air temperature in the cold room can be controlled.

The cooling capacity of the air cooler is adjusted by adjusting the refrigerant evaporation pressure of the air cooler by controlling the valve opening of the control valve based on the detection output of the dew point temperature sensor and the detection output of the pressure sensor. Control and prevent excessive dehumidification in the air cooler.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to a specific example shown in the drawings.

FIG. 1 shows the configuration of a temperature / humidity control device according to the present invention.

In the figure, the storage chamber 1 used for aging of dairy products and fruits, storage of fresh food, etc. is connected to the other end of an exhaust duct 3 whose one end is connected to the suction side of a blower 2 The discharge side of 2 is connected to an air cooler 5 by a duct 4, and this air cooler 5 is further connected to the storage chamber 1 by a blower duct 6.

The discharge side of the compressor 7 has a discharge pipe 8 through which a refrigerant passes.
An expansion valve 10 is provided in the middle of the discharge pipe 8 following the condenser 9, and the pipe 8 is connected to the cooling coil 5a of the air cooler 5. A control valve 17 is provided in the middle of a suction pipe 18 that connects the other end of the cooling coil 5a and the suction side of the compressor 7.

In the vicinity of the storage chamber 1 in the exhaust duct 3, a temperature sensor 11 that substantially detects the air temperature in the storage chamber 1 and a dew point temperature sensor 12 that detects the dew point temperature are provided. The detection output is supplied to a control circuit 13 that determines the required rotation speed of the blower 2. The control circuit 13 outputs a rotation speed control signal to a drive circuit 14 including an inverter of the blower 2.

Further, in the middle of the suction pipe 18 between the cooling coil 5a and the control valve 17,
A pressure sensor 15 for detecting the evaporation pressure of the refrigerant is provided, and the detection output of the pressure sensor 15 is supplied to the arithmetic control circuit 16, and the arithmetic control circuit 16 also outputs the detection output of the dew point temperature sensor 12. Is being supplied. The arithmetic control circuit 16 outputs a valve opening control signal to the control valve 17.

Next, the operation of the temperature / humidity control device thus configured will be described.

The arithmetic control circuit 16 uses the pipe 18 detected by the pressure sensor 15 described above.
The amount of heat collecting ability of the cooling coil 5a is obtained from the refrigerant evaporation pressure inside, and the cooling temperature of the air cooler 5 is obtained from this heat collecting ability. Then, in order to adjust the cooling temperature of the air cooler 5, the arithmetic control circuit 16 outputs a valve opening / closing degree control signal to the control valve 17.

For example, in order to lower the temperature for cooling the air of the air cooler 5, the arithmetic control circuit 16 outputs a valve opening degree expansion control signal to the control valve 17. As a result, the evaporation pressure of the refrigerant in the suction pipe 18 is lowered, so that the heat collecting ability of the cooling coil 5a is increased, and as a result, the cooling temperature of the air cooler 5 is lowered.

On the contrary, in order to raise the temperature for cooling the air of the air cooler 5, the arithmetic control circuit 16 outputs a valve opening reduction control signal to the control valve 17. As a result, the evaporation pressure of the refrigerant in the suction pipe 18 increases, so that the heat collecting capacity of the cooling coil 5a decreases and the cooling temperature of the air cooler 5 increases.

Further, the arithmetic control circuit 16 adjusts the valve opening / closing degree of the control valve 17 based on the detection output of the pressure sensor 15 so as to prevent the refrigerant evaporation pressure in the pipe 18 from increasing abnormally.

Further, the arithmetic and control circuit 16 obtains a change with time from the dew point temperature of the indoor air in the storage chamber 1 detected by the dew point temperature sensor 12 provided in the vicinity of the storage chamber 1 of the duct 3, and also calculates the change with time of the dew point temperature. The cooling temperature of the air cooler 5 is adjusted to compensate.

For example, if moisture is released from the stored articles in the storage room 1, the absolute humidity of the entire storage room 1 will rise, and as a result, the dew point temperature in the storage room 1 will rise.

Therefore, the arithmetic control circuit 16 adjusts the cooling temperature of the air cooler 5 with the control valve 17 so that the temperature is slightly lower than the rising dew point temperature, and the humidity gradually increases from the air passing through the air cooler 5. To remove.

As a result, the absolute humidity of the entire storage room 1 is lowered, and the dew point temperature indicated by the dew point temperature sensor 12 is also lowered. Further, when the dew point temperature indicated by the dew point temperature sensor 12 is still higher than the target dew point temperature given in advance, the arithmetic control circuit 16 again causes the air cooler to reach a temperature slightly lower than the lowered dew point temperature. The cooling temperature of 5 will be adjusted. In this way, the cooling temperature of the air cooler 5 is constantly adjusted to be slightly lower than the dew point temperature, so that the dew point temperature indicated by the dew point temperature sensor 12 is controlled to be the target value.

Actually, when the absolute humidity of the storage room 1 is lowered, the arithmetic control circuit 16 controls so that the cooling temperature of the air cooler 5 is sequentially lowered so that the change with time of the dew point temperature becomes a predetermined value.

Also, when the dew point temperature of the storage room 1 is much higher than the desired temperature, as described above, the cooling temperature of the air cooler 5 is set so that the decrease with time of the dew point temperature indicated by the dew point temperature sensor 12 becomes a predetermined value. I am trying to lower it one by one.

Then, the dew point temperature at the desired room temperature of the storage room 1 is
Although it depends on the relative humidity of the room air, when the relative humidity is close to 100%, the room temperature and the dew point temperature are almost the same. Therefore, the cooling temperature of the air cooler 5 is adjusted by the arithmetic control circuit 16 so as to finally reach a temperature near this dew point temperature (that is, room temperature).

In addition, since the cooling temperature of the air cooler 5 is always controlled by the arithmetic control circuit 16 so as to be the target dew point temperature, the temperature in the storage chamber 1 may not be rapidly lowered at this cooling temperature. is there. For example, storage room 1 due to seasonal changes
When the heat load on the
If it is 100%, it is about 30% in winter. Therefore, when the room temperature in the storage chamber 1 cannot be properly maintained due to the increase in heat load, the room temperature in the storage chamber 1 is lowered by increasing the amount of air cooled by the air cooler 5.

For example, when the room temperature of the storage room 1 based on the detection output of the temperature sensor 11 is higher than the target temperature, the control circuit 13 causes the blower 2 to operate.
A control signal is output to the drive circuit 14 so as to increase the number of rotations. As a result, the amount of air cooled by the air cooler 5 increases, so that the room temperature in the storage chamber 1 decreases.

When the control circuit 13 detects that the room temperature of the storage room 1 based on the detection output of the temperature sensor 11 has reached the target temperature, the drive circuit 14 gradually reduces the rotation speed of the blower 2.
The control signal is output to.

In this way, the cooling temperature of the air cooler 5 is always controlled by the arithmetic control circuit 16 to be a value slightly lower than the dew point temperature indicated by the dew point temperature sensor 12, and the air passing through the duct 3 should be dehumidified gradually. Is controlled so that the target dew point temperature of the storage room 1 is reached. On the other hand, the amount of air blown by the blower 2 has nothing to do with the dew point temperature indicated by the dew point temperature sensor 12, and when the room temperature of the storage room 1 exceeds the target temperature, the control circuit 13 sequentially changes the rotation speed of the blower 2. A control signal is output to the drive circuit 14 so as to make the adjustment.

As described above, in the temperature / humidity control device, the cooling temperature of the air cooler 5 is always set to a temperature slightly lower than the dew point temperature of the storage chamber 1. Therefore, excessive dehumidification in the air cooler 5 is prevented. Therefore, the air in the storage room 1 having an extremely high relative humidity can always be obtained.

Therefore, it is not necessary to reheat and rehumidify the air after cooling and dehumidifying which has passed through the cooler to maintain a predetermined temperature and humidity as in the conventional case, and efficient temperature and humidity control can be performed.

The temperature sensor 11 and the dew point temperature sensor 12 may be provided in the storage chamber 1.

[Effects of the Invention] As described above, in the present invention, when the low temperature and high humidity conditioned air to be supplied to the cold storage chamber is obtained, the suction control valve is controlled by the air dew point temperature in the cold storage chamber to cool the air cooler. While preventing the temperature from becoming too low, the rotation speed of the blower is controlled by the air temperature in the cool room, so it is possible to prevent extreme dehumidification due to overcooling in the air cooler. It is not necessary to use a reheater or a reheater for heating and rehumidifying, and the device configuration can be simplified.
The cost can be reduced.

Further, since reheating and rehumidification are not performed, there is no energy loss, efficient low temperature and high humidity conditioned air can be obtained, and energy saving can be achieved.

[Brief description of drawings]

FIG. 1 is a block diagram of a temperature / humidity control device according to the present invention. In the figure, 1 ... Storage room, 2 ... Blower, 3 ... Exhaust duct, 4 ... Duct, 5 ... Air cooler, 5a ... Cooling coil, 6 ... Air duct, 7 ... Compressor, 8 ... Discharge pipe , 9 ... Condenser 10 ... Expansion valve, 11 ... Temperature sensor 12 ... Dew point temperature sensor 13 ... Control circuit, 14 ... Driving circuit 15 ... Pressure sensor, 16 ... Calculation control circuit 17 ... Control Valve, 18 ... Suction line

Claims (1)

[Scope of utility model registration request] 1. A discharge pipe from a compressor is provided with an expansion valve following a condenser, which is further connected to an air cooler, and an air cooler is connected to the compressor by a suction pipe to form a refrigeration circuit and keep cool. An air blower and the air cooler are provided in the circulation passage of the air passing through the chamber, and a temperature sensor that substantially detects the air temperature in the cool chamber is provided in the circulation passage, and based on the detection output from the temperature sensor. The speed of the blower is controlled by
Further, a dew point temperature sensor for detecting the air dew point temperature in the cold insulation chamber is provided in the air circulation passage, and a pressure sensor is provided in the middle of the suction pipe, and the valve opening degree of the control valve provided in the suction pipe to the compressor is A temperature / humidity control device which is controlled based on a detection output from the dew point temperature sensor and a detection output from the pressure sensor.