JP7161650B2 - Dehumidification air conditioner - Google Patents

Description

Dehumidify and air-condition houses, offices, factories, livestock barns, etc.
It is desired to create a comfortable environment by dehumidifying and air-conditioning in summer, but dehumidification increases power consumption in conventional dehumidifiers. The present invention relates to an air conditioner that dehumidifies and reduces power consumption.

The main types of dehumidification methods are 1. Cooling and dehumidifying method 2 . dry dehumidification method;3. Spray dehumidification method 4 . Wet dehumidification methods and the like.

The cooling and dehumidification method is called an air conditioner, and when it is operated at 25°C in the summer, it is devised so that the dehumidification is operated simultaneously with the cooling, and the relative humidity is 60% RH. Since the air cannot be dehumidified unless it is once lowered to below the dew point temperature, the blowing temperature is lowered to 10° C. or higher than the air conditioning temperature, which requires a large amount of energy.
Also, when operating in the dehumidifying mode, the speed of the heat exchange fins slows down, so the room temperature rises above 25°C. In addition, power consumption increases since the refrigerator rotates at full speed from the cooling temperature operation of 25°C.
Generally used air conditioners are of the cooling and dehumidifying type, and are designed to keep the relative humidity around or below 60% RH when set to 25°C, creating a comfortable environment. Recently, the Environment Agency has requested that the air conditioning temperature be raised to 28°C in the summer in order to save energy. often not.

The dry dehumidification method is a method of dehumidifying silica gel by contacting it with air.
In this method, it is essential to remove the water adhering to the silica gel, and the silica gel must be regenerated with hot air of 120° C. or higher.
For this reason, heating power for the silica gel and cooling power for cooling the residual heat are required because the air in contact with the silica gel is heated.
Recently, it has been reported that diatomaceous earth from Wakkanai can be used for regeneration at low temperatures, but it has not yet been put to practical use because the amount of dehumidification is small.

The spray dehumidification method is a method of cooling the air to the dew point temperature in the dew point chamber and spraying water in the form of a mist to cool the air. It is effective for small air conditioners such as environmental test machines, but it is not suitable for general air conditioners such as houses.

In the wet dehumidification method, it is a wet dehumidification method using lithium chloride or calcium chloride solution, and if it is in the range of 25 ° C to 30 ° C, it is possible to save energy with a large amount of dehumidification effect, but lithium chloride, calcium chloride solution, etc. Since a regenerating device is required, the device is large and expensive, and it is necessary to treat the waste liquid of lithium chloride and calcium chloride, so it is not widely used.

Japanese Patent Application Laid-Open No. 2009-127929 Japanese Patent Application Laid-Open No. 11-141855 Japanese Patent Application Laid-Open No. 9-159253 Japanese Patent Application Laid-Open No. 2006-004674 Japanese Patent Application Laid-Open No. 2007-225154

When air-conditioning houses, offices, factories, livestock barns, etc. (hereinafter referred to as general air-conditioning), temperature control is performed, but humidity control is hardly performed.
The reason is that power consumption increases. The present invention regulates humidity to save energy in air conditioning.

In arid regions of foreign countries, even with a temperature of 30°C, the relative humidity is low and one feels comfortable. An experiment was conducted to confirm the real intention by performing a sensory test in a constant temperature and humidity room. The optimum cooling temperature of the air conditioner was almost the same as the air conditioner operating at 25°C when the room temperature was 30°C and the relative humidity was 40%.
About 20 years ago, according to the results of a test conducted by the Department of Urban Environment, Faculty of Engineering, Chiba University, 45 out of 50 people had the same sensible temperature. The dehumidification method at this time was described as a dry dehumidification method.

Means to solve problems

Everyone knows about humidifying with water, but not many people know about dehumidifying with water. The experiment will be conducted using the constant temperature and humidity shown in Figure 3.
A water tank is created in a sealed constant temperature and humidity chamber, and a cooling coil is installed so that the water can be cooled and the temperature of the water can be adjusted and cooled.
"Experiment 1" When the room temperature is 30°C and the water temperature is 30°C (result control), the relative humidity becomes 100%. When the room temperature is 30° C. and the water temperature is 20° C. (cooling control), the relative humidity becomes 40%. From the above experiments, the cooled water is dehumidified. They also found that the water temperature is the same as the wet-bulb temperature.

I will explain the three-dimensional water surface of the present invention. At the time of cooling, the heat pump 8 is selected for cooling operation, and the indoor air is cooled by the heat pump fins 6. At the same time, the refrigerant is also sent to the plate heat exchanger 5 to lower the water temperature to a temperature lower than the wet bulb temperature of the room temperature. 2 to dehumidify by contacting the indoor air, select the heat pump 8 for heating operation during heating, heat the indoor air with the heat pump fins 6, and at the same time, the refrigerant is also supplied to the plate heat exchanger 5 and the water heated to a temperature higher than the wet-bulb temperature of the indoor air is supplied from above the nonwoven fabric 2 to bring it into contact with the indoor air for humidification.

Effect of the invention

A conventional air conditioner is designed to have a relative humidity of 60% when the indoor relative humidity is controlled at a room temperature of 25° C., so the relative humidity is 60%. Therefore, the enthalpy of the indoor air is (hb57) , the blowing air temperature is 15°C, the blowing enthalpy is (hc42.7) , and the enthalpy difference of the load of the air conditioner is 13.3.
The air conditioning load due to the three-dimensional water surface of the present invention is an indoor humidity of 30 ° C., an indoor relative humidity of 40%, an indoor enthalpy of (RM57.9) , and a blown air temperature of 23.4 and a relative humidity of 57%. However, since the blowing enthalpy is (RM52.0) , the enthalpy difference in this application is 5.9.
Compared with the conventional air conditioner, the enthalpy difference is 13.3, and the enthalpy difference due to the three-dimensional water surface of the present application is 5.9, resulting in an energy saving of 55.4%. The calculation is the air conditioning load (hb57) - (hc42.7) = 13.3 due to the three-dimensional water surface of the present invention in the conventional method,
Since the enthalpy difference between the air conditioning load due to the three-dimensional water surface of the present invention and the air conditioning load due to the three-dimensional water surface of the present invention is (RM57.9) - (RC52.0) = 5.9 ,
The consumption enthalpy difference is 44.6%, and the energy saving ratio is 55.4%. Even if the blowing temperature is above the water surface temperature (23.4°C), the dew point is dehumidified to 15°C. So significant energy savings are evident .

It is a figure which shows the structure of the temperature/humidity control regarding general air conditioning in connection with embodiment of this invention. Detail view of the three-dimensional water surface of the present invention. A schematic diagram of a constant temperature/humidifier for explaining that dehumidification can be performed on the cooled water surface. It is a summer day average humidity diagram of a cooling device used for conventional general air conditioning. Fig. 2 is a wetness diagram of the average load for one day in summer during cooling when the three-dimensional water surface of the present invention is used for general air conditioning.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG.
(FIG. 1) is a diagram schematically showing the configuration of temperature and humidity control for general air conditioning according to an embodiment of the present invention, showing the structure of a three-dimensional water surface of the present invention.
1. Water tank 2. Non-woven fabric (three-dimensional water surface) 3. Submersible pump 4 . Water pipe 5 . plate heat exchanger6. Air conditioning fan 7 . circulation fan 8 . It is an air conditioner composed of a heat pump or the like.
During cooling (FIG. 2), the heat pump 8 is selected for cooling operation, and the indoor air is cooled by the heat pump fins 6. At the same time, the refrigerant is also sent to the plate heat exchanger 5, and the water temperature is lower than the wet bulb temperature of the indoor temperature. Cooling water is flowed from the top of the nonwoven fabric 2 to dehumidify by contacting it with the indoor air, and when heating, the heat pump 8 is selected for heating operation, and the indoor air is heated by the heat pump fins 6. At the same time, the plate In this air conditioner, the refrigerant is also sent to the heat exchanger 5, and water heated to a temperature higher than the wet-bulb temperature of the indoor air is supplied from above the non-woven fabric 2 to bring it into contact with the indoor air for humidification .
(FIG. 3) is a conventional technology of constant temperature and humidity. It is a reference diagram for explaining that the water surface can be dehumidified.
1. Water tank 4. Cooling gas pipe 6 . air conditioning fins 12 . circulation fan.
(Fig. 4) is an air moisture diagram of a conventional air conditioner and is a reference diagram for comparing energy saving.
FIG. 5 is an air moisture diagram illustrating air conditioning using a three-dimensional water surface according to the present invention. It is a figure for comparing energy saving.

Industrial applicability

In the summer with respect to the air humidity diagram [Fig. 4], when the outside air temperature is 32°C and the relative humidity is 50%, conventional air conditioning is used to control the comfortable environment with the indoor temperature of 25°C and the relative humidity of 60%. The enthalpy of the air is the enthalpy at the air conditioner inlet (hb 56.0), and the enthalpy at the air conditioner outlet is (hc 42.7) = enthalpy difference (12.3) x air volume Multiply by

It relates to the air wetness diagram [Fig. 5].
In summer, when the outside temperature is 32°C and the relative humidity is 50% RH, when the outside temperature is 32°C and the relative humidity is 50% RH, the three-dimensional water surface of the present invention and the attached air conditioner are used at the indoor temperature of 30°C and the relative humidity. In order to investigate the energy consumption when controlling in a comfortable environment of 40%, the difference in enthalpy is multiplied by the air volume.
The enthalpy of the circulating air (RM57.9 ) is the enthalpy of the air conditioner outlet temperature (RC52.0), and the enthalpy difference (5.9) x air volume.

Symbols in FIG. 1 1. Water tank 2 . Non-woven fabric (three-dimensional water surface) 3. Submersible pump 4 . water pipe5. Plate heat exchanger 6 . 8. heat pump fins; Symbols of the heat pump [Fig. 2] 1. Water tank 2 . Non-woven fabric (three-dimensional water surface) 4. Water pipe 9 . Fixture for non-woven fabric (three-dimensional water surface)
Reference numeral 1 in FIG. 3 Water tank 10 . Cooling/heating coil 11 . heater 12 . circulation fan
Symbol A. in FIG. Ambient air M.I. Indoor air C. Chiller outlet air hM. Room enthalpy hC. The cooler exit enthalpy [Fig. 5] is labeled A. Ambient air M.I. Indoor air C. air conditioner outlet air
RM. Room enthalpy RC. Air conditioner outlet enthalpy

Claims (1)

A three-dimensional water surface composed of a water tank 1, a nonwoven fabric 2, a submersible pump 3, a water pipe 4, and a plate heat exchanger 5, and is a device capable of continuously circulating water and dehumidifying, and the three-dimensional water surface is vertical. At the time of cooling, the heat pump 8 is selected for cooling operation, and the heat pump fins 6 cool the indoor air, and at the same time, the refrigerant is also sent to the plate heat exchanger 5 to reduce the water temperature to the humidity of the indoor temperature. Cooling water made to a temperature lower than the ball temperature is flowed from the upper part of the nonwoven fabric 2, and the nonwoven fabric 2 is brought into contact with the room air to dehumidify,
At the time of heating, the heat pump 8 is selected for heating operation, the indoor air is heated by the heat pump fins 6, and at the same time, the refrigerant is also sent to the plate heat exchanger 5 to raise the water temperature to a temperature higher than the wet bulb temperature of the indoor air. An air conditioner that humidifies by flowing heated water from above the nonwoven fabric 2 and bringing it into contact with room air.

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