JPH043874A - Maintaining method of constant humidity in casing - Google Patents

Abstract

PURPOSE:To maintain a temperature in a casing in constant surely by a method where in a cooling tank, absorbing sensibe heat invading from the outside of the casing, is provided on the inner peripheral surface of the casing while the temperature in the casing, which can maintain a dew point corresponding to an air temperature in the casing, is set based on a saturation curve. CONSTITUTION:In a evaporator 5, refrigerant is evaporated by depriving circulating brine 3 of the heat thereof whereby the brine 3 is cooled. When sensible heat tries to invade from the outside of a casing, the brine 3 in the cooling tank 4 is precooled in such a manner and, therefore, the sensible heat is absorbed immediately by the brine 3. Accordingly, the temperature change of air in the casing is not generated and, therefore, the relative humidity of the air in the casing is not reduced and the constant humidity of the air in the casing can be maintained by only regulating the temperature of the brine 3. In order to regulate a relative humidity in the casing so as to be less than 100%, a heater H2 is inserted into the casing, for example, to regulate the temperature of the air in the casing by the heater H2 in conjunction with the operation of a thermostat while a humidity of the air in the casing can be maintained in constant by regulating the temperature of the air in the casing by the heater H2 and keeping the surface temperature of the cooling tank 4 at a given dew point temperature.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for maintaining constant humidity inside a refrigerator, and in particular, a method for maintaining a constant humidity inside a refrigerator, and in particular, a method for maintaining a dew point in a refrigerator and further adjusting the dew point based on the dew point. This invention relates to a method for maintaining constant humidity in a refrigerator by adding a certain amount of sensible heat from inside the refrigerator to the temperature in the refrigerator to maintain the relative humidity in the refrigerator at a desired constant humidity.

[Prior art] As a conventional device for keeping the humidity constant in this kind of warehouse,
The one described in Japanese Utility Model Application Publication No. 56-140085 is known. This is a forced convection type storage in which a cooler and a fan motor for circulating cold air are installed to form a cold air passage, and a water tank for frosting the cooler is installed in the middle of the cold air passage. The system is designed to evaporate the water stored in this tank and create stable frost on the cooler.Furthermore, a heater is installed near the tank to evaporate the water stored in the tank. It is heated to prevent the water in the tank from freezing.

In this way, the water in the water tank is evaporated, and this steam is caused to form frost on the surface of the cooler, thereby maintaining the humidity inside the refrigerator at a constant level.

[Problems to be Solved by the Invention] In the above-mentioned conventional type, a water tank is provided inside the refrigerator, and the water in the tank is evaporated to form frost on the cooler, thereby keeping the inside of the refrigerator at an appropriate level of humidity. However, when the internal temperature is around 0℃, the difference in vapor pressure is small, and it is inefficient to evaporate the water in the tank and replenish moisture into the air. be. In addition, a heater is installed near the aquarium to raise the water temperature and prevent the water in the tank from freezing, thereby promoting evaporation, but heating the heater generates sensible heat, which causes a decrease in relative humidity. If water is heated to the extent that it not only promotes freezing but also simply prevents water from freezing, evaporation of water at low temperatures cannot be expected to be as great as it is.

Furthermore, it is difficult to maintain the humidity inside the refrigerator at a constant level by causing the cooler to frost the water vapor in the air inside the refrigerator. It can also hinder the

Therefore, it is necessary to eliminate the attempt to maintain the humidity inside the refrigerator at a constant level without installing a water tank in the refrigerator and by frosting the cooler, and to develop a technology that can reliably maintain the humidity inside the refrigerator at a constant level. The present invention aims to solve this problem.

[Means for Solving the Problems] The present invention was proposed to solve the above-mentioned object, and includes providing a cooling tank on the inner peripheral surface of the refrigerator to absorb sensible heat that enters from outside the refrigerator. A temperature inside the refrigerator that can maintain the dew point corresponding to the temperature of the air inside the refrigerator is set based on a saturation curve, and the dew point of the moisture in the air inside the refrigerator can be maintained within the range of the set temperature. A certain amount of sensible heat is supplied to the dew point air in the refrigerator maintained by the method for maintaining constant humidity in the refrigerator to raise the temperature in the refrigerator to a predetermined temperature, and a desired relative It is an object of the present invention to provide a method for maintaining constant humidity in a refrigerator, which is characterized in that the humidity can be maintained at constant humidity by adjusting the humidity.

[A cooling tank is provided on the inner peripheral surface of the refrigerator to absorb the sensible heat that tries to enter from outside the refrigerator, so the temperature inside the refrigerator will be raised again by the sensible heat from outside the refrigerator. Therefore, the relative humidity inside the refrigerator can be maintained constant.

Therefore, in order to always maintain the humidity inside the refrigerator at the dew point, the range of temperature inside the refrigerator that corresponds to maintaining the dew point is determined based on the saturation curve, and the set temperature inside the refrigerator is always maintained within a certain range by the function of the cooling tank. Therefore, the relative humidity corresponding to this temperature is always maintained at 100% relative humidity (dew point).

In addition, based on the dew point, for example, by providing a heater in the refrigerator and supplying a certain amount of sensible heat into the refrigerator, the air temperature in the refrigerator is raised to a constant temperature, and as described above, the temperature of the air inside the refrigerator is increased by the action of the cooling tank. By keeping the temperature constant, the relative humidity inside the refrigerator can be adjusted to a desired humidity, and this humidity can therefore be maintained at a constant temperature.

[Example] An example of the present invention will be described below with reference to the attached drawings and graphs. Figure 1 is an explanatory diagram showing the cooling cycle. In the figure, (1) is a refrigerator, the inside of which is covered with heat insulating material (2), and brine (3) is circulated over the entire surface of the refrigerator. A cooling tank (4) is installed to at least cool the inside of the refrigerator. In addition, this refrigerator (+) uses a compression refrigerator, and the circulating brine (
A water pump (8) and a circulation pipe (9) are arranged for cooling the brine (3) and circulating the condenser (6) and compressor (η) as well as the brine (3).

Freon is sealed in the refrigerant, and the compressor (7) sends the refrigerant to the condenser (6), where the high-temperature refrigerant gas is cooled and liquefied by the surrounding air.

Further, in the evaporator (5), the refrigerant absorbs heat from the circulating brine (3) and vaporizes it, so that the brine (3) is vaporized.
) to cool down. In this way, the refrigeration cycle consists of a compressor (7
) - condenser (6) - evaporator (5) - compressor (7) to form one cycle, and the refrigerant radiates heat and liquefies in the condenser (6),
The evaporator (5) absorbs heat from the brine (3) and vaporizes it, and the air inside the warehouse is cooled while repeating liquefaction and vaporization in the refrigeration cycle.

In this way, even if sensible heat tries to enter from outside the refrigerator, the brine (3) in the cooling tank (4) has been cooled in advance, so the sensible heat is immediately absorbed by the brine (3). Therefore, since the temperature of the air in the refrigerator does not change, the relative humidity of the air in the refrigerator does not decrease, and the air in the refrigerator can be maintained at constant humidity simply by adjusting the temperature of the brine (3).

In order to adjust the humidity inside the refrigerator, for example, a heater (Ill) is inserted into the refrigerator, and in conjunction with the function of a thermostat (not shown), the heater (I+, ) controls the humidity inside the refrigerator. By adjusting the temperature of the air and keeping the surface temperature of the cooling tank (4) at a constant dew point temperature, the humidity of the air inside the refrigerator can be maintained constant.

In addition, in order to adjust the relative humidity inside the refrigerator to 100% or less, for example, a heater (+12) is inserted into the refrigerator, and in conjunction with the function of a thermostat (not shown), the heater (H2)
By adjusting the temperature of the air inside the refrigerator and keeping the surface temperature of the cooling tank (4) at a constant dew point temperature, the humidity of the air inside the refrigerator can be maintained constant.

Here, according to the law regarding the amount of heat in the air, when sensible heat is given (heated), the relative humidity decreases, and conversely, sensible heat is taken away (
It is clear that relative humidity increases with cooling (cooling), and a graph of this relationship is shown in FIG. Relative humidity is the ratio of the amount of water vapor actually contained in a certain volume of air to the maximum amount of water vapor that the air can contain at that temperature (saturated water vapor amount), expressed as a percentage. It is.

Therefore, as shown in the same graph, when the air at point A at a temperature of 25° C. at a relative humidity of 60% is cooled, sensible heat is taken away, and the temperature decreases to point B. Point B is the dew point at that temperature, and if cooling continues beyond that point, moisture exceeding the saturation amount will be exposed, and the absolute humidity will be dehumidified while decreasing, reaching the zero point. The relative humidity at this time is 100%, and if the air that has reached the 0 point is heated by sensible heat that has entered from outside the refrigerator, the temperature will rise by Δ to C-+D, and at this time the relative humidity in the air Humidity drops to 80%. As a result, moisture evaporates from fresh foods and other foods stored in the refrigerator, causing them to dry out. In this embodiment, as mentioned above, the brine (3) absorbs the sensible heat (Δt) from C to D, so the temperature and humidity inside the refrigerator can be kept constant without decreasing the relative humidity. It is.

Furthermore, when cooled, the moisture that cannot be contained in the air inside the refrigerator is condensed and precipitated, and the amount of this precipitation increases as the temperature and absolute Humidity decreases and reaches point E. However, if the temperature falls below 0° C., freezing occurs, so the internal surface temperature for maintaining the dew point of the air inside the refrigerator falls within the temperature range from point B to near point E.

Therefore, the temperature range (L) from point B to near point E
By setting the temperature as the set temperature and maintaining the surface temperature inside the refrigerator within this set temperature (L), the relative humidity of the air inside the refrigerator is always maintained at 100%.

Next, when trying to set the relative humidity of the air inside the refrigerator to 80% at the 0 point, for example, using the dew point as a reference,
A certain amount of sensible heat is supplied into the refrigerator using a heater (112) installed inside the refrigerator. In that case, as mentioned above, the temperature inside the refrigerator rises to C (10'C) - D (13 °C),
The relative humidity will be 80%. Therefore, by maintaining the surface temperature of the cooling tank at 10° C., the relative humidity of 80% can be kept constant. Even at this time, all the sensible heat that tries to enter from outside the refrigerator is absorbed by the cooling tank (4), so the temperature inside the refrigerator is not reheated and is maintained at the constant humidity.

[Effects of the Invention] According to the present invention, the temperature inside the refrigerator can be kept constant because all the sensible heat that tries to enter from outside the refrigerator is absorbed by the cooling tank installed inside the refrigerator.

Therefore, first, the temperature in the refrigerator to maintain the relative humidity in the refrigerator at 100% is set using a saturation curve, and by maintaining the temperature in the refrigerator at this set temperature, the relative humidity 10% is set.
0% can be maintained at all times.

In addition, this relative humidity is based on 10% (1%), and when it is desired to lower the relative humidity below this, a certain amount of sensible heat is supplied to the inside of the refrigerator using a heater installed inside the refrigerator, and the temperature inside the refrigerator is lowered. The relative humidity is lowered to the desired relative humidity by increasing the humidity. By maintaining this temperature inside the refrigerator, the desired relative humidity can be maintained at a constant temperature. Since heat is absorbed by the cooling tank installed in the refrigerator, various modifications can be made as long as the temperature inside the refrigerator is reheated, and this invention does not extend to such modifications. Of course.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, FIG. 1 is an explanatory diagram showing a cooling cycle, and FIG. 2 is a graph.

Claims (2)

[Claims] (1) A cooling tank is installed on the inner peripheral surface of the refrigerator to absorb the sensible heat that enters from outside the refrigerator, and the temperature inside the refrigerator is set based on the saturation curve to maintain the dew point corresponding to the air temperature inside the refrigerator. . A method for maintaining constant humidity inside a refrigerator, characterized in that the dew point of moisture in the air inside the refrigerator can be maintained within the range of the set temperature. (2) A certain amount of sensible heat is supplied to the dew point air in the refrigerator which is maintained by the method for maintaining constant humidity in the refrigerator according to claim (1) to raise the temperature in the refrigerator to a predetermined temperature, thereby achieving the desired temperature. A method for maintaining constant humidity in a refrigerator, characterized by adjusting the relative humidity to maintain constant humidity.