JP4436900B2 - Desiccant air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a desiccant air conditioner that supplies dehumidified air at a reduced temperature by evaporative cooling of water.
[0002]
[Prior art]
The desiccant air conditioner is a cooling device that does not use chlorofluorocarbon, and has attracted attention recently because it can supply comfortable air even during the rainy season because the temperature of the supplied air does not decrease even if dehumidifying operation is performed. Yes.
[0003]
FIG. 4 shows an outline of a general open cycle desiccant air conditioner. In FIG. 4, reference numeral 1 denotes a dehumidification rotor, which is stepped (corrugated) ceramic fiber paper or glass fiber paper and wound with flat paper to form a honeycomb shape (honeycomb shape) on which silica gel is synthetically supported. Or zeolite is supported.
[0004]
Further, the dehumidification rotor 1 is divided into an adsorption zone 2 and a desorption zone 3 and is rotatably provided so as to be continuously adsorbed and desorbed.
[0005]
Reference numeral 4 denotes a sensible heat exchange rotor, which is formed into a honeycomb shape by corrugating a metal sheet such as aluminum, stainless steel or copper or a synthetic resin sheet such as polypropylene or polyester together with a flat sheet.
[0006]
The sensible heat exchange rotor 4 is divided into a first flow path 5 and a second flow path 6 that exchange heat with each other, so that heat exchange is continuously performed between the first flow path 5 and the second flow path 6. It is provided rotatably.
[0007]
7 and 8 are evaporative coolers, and 9 is a heater. Steam from a solar water heater or boiler is supplied to the heater 9 to heat the air passing therethrough.
[0008]
The high-temperature and low-humidity air that has exited the adsorption zone 2 of the dehumidifying rotor 1 enters the first flow path 5 of the sensible heat exchanger 4 and is cooled, and the air that has exited the first flow path 5 is further cooled by the evaporative cooler 7. To supply indoors.
[0009]
Also, the indoor air is cooled by the evaporative cooler 8 and enters the second flow path 6 of the sensible heat exchanger 4 to cool the sensible heat exchange rotor 4, and the air whose temperature has increased through the second flow path is removed. The heater 9 is further heated, and the moisture adsorbed on the dehumidification rotor 1 is desorbed through the desorption zone 3 of the dehumidification rotor 1.
[0010]
In this way, the conventional desiccant air conditioner can perform cooling with the thermal energy supplied to the heater 9 without using a gas that adversely affects the environment such as Freon.
[0011]
[Problems to be solved by the invention]
Although the conventional desiccant air-conditioning apparatus is preferable because it does not adversely affect the environment as described above, the humidity of the supply air is almost determined by the air condition of the outside air, and the humidity cannot be lowered much. There is.
[0012]
In other words, when using an adsorption-type dehumidifying means, heat of adsorption is generated, and the dryness of air cannot be increased beyond a certain value. Therefore, there is a limit to lowering the temperature by evaporating water in the dry air. was there.
[0013]
The present invention pays attention to the above points, and desiccant air conditioner capable of producing air with extremely low humidity using an adsorption-type dehumidifying means and obtaining low-temperature supply air when combined with a vaporization cooling means. Is to provide.
[0014]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention dehumidifies the outside air with the first dehumidifying means, and reduces the temperature by exchanging the sensible heat with the dry air whose temperature has been increased by dehumidification, and drying at a reduced temperature. The air was further dehumidified by the second dehumidifying means, and the temperature was lowered by sensible heat exchange of the dried air whose temperature was increased by dehumidification with room air, and the air was supplied to the room.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
In the invention according to claim 1 of the present invention, the outside air is dehumidified by the first dehumidifying means, and the temperature is lowered by exchanging the sensible heat of the dried air whose temperature has been increased by the dehumidification with the outside air. Is further dehumidified by the second dehumidifying means, and the sensible heat exchange of the dried air whose temperature has been increased by dehumidification is reduced to supply the indoor air, and the first dehumidifying means Since the air whose temperature has risen is once cooled and placed in the second dehumidifying means, it has an effect that it can supply air with extremely high dryness.
[0016]
【Example】
Embodiments of the desiccant air conditioner according to the present invention will be described below in detail with reference to the drawings. Moreover, the same number is given about the same component as the conventional desiccant air conditioner explained above, and duplication description is avoided.
[0017]
In FIG. 1, reference numeral 1 denotes a dehumidification rotor, which is divided into an adsorption zone 2 and a desorption zone 3, and is rotatably provided so as to be continuously adsorbed and desorbed.
[0018]
Reference numeral 4 denotes a sensible heat exchange rotor, which is divided into a first flow path 5 and a second flow path 6 that perform heat exchange with each other, and heat exchange is continuously performed between the first flow path 5 and the second flow path 6. It is provided so that it can rotate.
[0019]
7 and 8 are evaporative coolers, and 9 is a heater. Steam from a solar water heater or boiler is supplied to the heater 9 to heat the air passing therethrough.
[0020]
Dehumidification rotor 10 is the same as dehumidification rotor 1. The dehumidification rotor 10 is divided into an adsorption zone 11 and a desorption zone 12, and is rotatably provided so as to be continuously adsorbed and desorbed.
[0021]
Reference numeral 13 denotes a sensible heat exchange rotor, which is the same as the sensible heat exchange rotor 4. The sensible heat exchange rotor 13 is divided into a first flow path 14 and a second flow path 15 that exchange heat with each other, and heat exchange is continuously performed between the first flow path 14 and the second flow path 15. It is provided rotatably.
[0022]
Reference numeral 16 denotes a heater, which is the same as the heater 9. Similarly to the heater 9, the heater 16 is supplied with steam from a solar water heater or a boiler, and heats the air passing therethrough.
[0023]
The high-temperature and low-humidity air that has exited the adsorption zone 2 of the dehumidifying rotor 1 enters the first flow path 5 of the sensible heat exchanger 4 and is cooled, and the air that has exited the first flow path 5 enters the adsorption zone 11 of the dehumidifying rotor 10. It is configured to dehumidify and cool the air exiting the adsorption zone 11 through the first flow path 14 of the sensible heat exchange rotor 13, and then further cooled by the evaporative cooler 7 and supplied to the room.
[0024]
The indoor air is cooled by the evaporative cooler 8, enters the second flow path 15 of the sensible heat exchanger 13, enters the desorption zone 12 of the dehumidifying rotor 10 through the heater 16, and is then released to the atmosphere. .
[0025]
The atmosphere passes through the second flow path 6 of the sensible heat exchanger 4, exits the second flow path 6, passes through the heater 9, exits the desorption zone 3 of the dehumidifying rotor 1, and is released to the atmosphere.
[0026]
The desiccant air conditioner of the present invention is configured as described above. Next, the operation thereof will be described with reference to the air diagram of FIG.
[0027]
First, the outside air A is passed through the adsorption zone 2 of the dehumidifying rotor 1, and the dry air B whose temperature has been increased by the heat of adsorption is passed through the first flow path 5 of the sensible heat exchange rotor 4 to reduce the temperature to the air C. On the air diagram of FIG. 2, air A (outside air) having a temperature of 35 ° C. and a relative humidity of about 60% becomes air B dried to a temperature of 68 ° C. and a relative humidity of about 8%. Since only the sensible heat falls in the sensible heat exchange rotor 4, it moves horizontally from the air B to the air C on the air diagram.
[0028]
The dried air whose temperature has decreased is passed through the adsorption zone 11 of the dehumidifying rotor 10 to further increase the dryness. The temperature rises to about 64 ° C. by the heat of adsorption in the adsorption zone 11, and the dry air D dried to about 5% relative humidity is passed through the first flow path 14 of the sensible heat exchange rotor 13, and the temperature is lowered to about 37 ° C. Let it be air E.
[0029]
As the temperature drops, air E with extremely high dryness is passed through the evaporative cooler 7 and cooled by the heat of vaporization of water, and supplied to the room as air F having a temperature of 17 ° C. and a relative humidity of 90%.
[0030]
The air G whose temperature has increased to 28 ° C. in the room hardly increases the absolute humidity, and therefore the relative humidity decreases to nearly 50%. If the air G is passed through the evaporative cooler 8 so that the relative humidity is approximately 100%, the temperature is lowered to 20 ° C. and becomes air H.
[0031]
When this air H is passed through the second flow path 15 of the sensible heat exchange rotor 13 and the sensible heat exchange rotor 13 is cooled by the air H, the temperature of the air H increases to 57 ° C. to become air I. This air I may be partially released to the atmosphere according to the air volume necessary for desorption of the dehumidifying rotor 10. In other words, a reduction in the amount of air passing through the heater 16 can be expected to reduce the amount of heat supplied to the heater 16, and the cooling coefficient of performance (COP) increases.
[0032]
The air I passes through the heater 16, the temperature rises to 80 ° C., and becomes air J. This air J is passed through the desorption zone 12 of the dehumidifying rotor 10 to desorb the moisture adsorbed on the dehumidifying rotor 10. The temperature of the air after desorption decreases to 50 ° C., the relative humidity increases to 27%, and becomes air K. This air K is released to the atmosphere.
[0033]
The atmosphere A passes through the second flow path 6 of the sensible heat exchange rotor 4 and cools the sensible heat exchange rotor 4. On the contrary, the atmosphere A is heated by the sensible heat exchange rotor 4, the temperature rises to 62 ° C., and becomes air L. This air L may be partially released to the atmosphere according to the capability of the heater 9. That is, when the capacity of the heater 9 is low, the temperature rise by the heater 9 can be expected by reducing the air volume passing through the heater 9, and the desorption characteristics are improved.
[0034]
The air L passes through the heater 9, the temperature rises to 80 ° C., and becomes air M. This air M is passed through the desorption zone 3 of the dehumidifying rotor 1 to desorb the moisture adsorbed on the dehumidifying rotor 1. The temperature of the air after desorption decreases to 40 ° C., the relative humidity increases to 60%, and becomes air N. This air N is released to the atmosphere.
[0035]
Thus, since the desiccant air conditioner of the present invention further dehumidifies after cooling the dried air through the dehumidifying rotor 1, it can generate highly dry air, and this dry air is used. As a result, the effect of the evaporative cooler 7 is enhanced and air having a low temperature can be supplied.
[0036]
A comparison between the desiccant air conditioner of the present invention and a conventional desiccant air conditioner is performed with reference to FIG. FIG. 3 shows the cooling coefficient of performance (COP) and the absolute humidity of the supply air with the temperature efficiency η of the sensible heat exchange rotor of the desiccant air conditioner of the present invention and the conventional desiccant air conditioner set to 0.85 and 0.9. Thus, it can be seen that the COP decreases when the outside air condition is in the low humidity region, but the cooling capacity is remarkably improved in the high humidity region.
[0037]
In FIG. 3, T ₁ indicates the outside air temperature, T ₅ indicates the temperature of the indoor air G, and H ₅ indicates the same humidity. T ₈ indicates the temperature of the air J exiting the heater 16. U ₁ represents the flow velocity of the air flowing through the adsorption zone of the dehumidification rotor 1, and U ₁ / U ₈ represents the regenerative air flow ratio, that is, the flow velocity ratio of the air flowing through the adsorption zone and the desorption zone 2 of the dehumidification rotor 1. L represents the width of the dehumidifying rotor 1. CE represents a cooling effect, that is, an enthalpy difference between outside air and room air.
[0038]
【The invention's effect】
Since the desiccant air conditioner of the present invention is configured as described above, the cooling capacity can be remarkably improved when the outside air is in a high humidity region. This characteristic is suitable for Japan, which is hot and humid in summer.
[0039]
Furthermore, the desiccant air conditioner of the present invention can use the hot water supplied from a solar heater or an exhaust heat source for the heater, so that the substantial power consumption during cooling can be made extremely small.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an embodiment of a desiccant air conditioner according to the present invention.
FIG. 2 is an air line diagram showing characteristics of the desiccant air conditioner of the present invention.
FIG. 3 is an efficiency diagram showing characteristics of the desiccant air conditioner of the present invention.
FIG. 4 is an explanatory diagram of a conventional desiccant air conditioner.
[Explanation of symbols]
1, 10 Dehumidification rotor 2, 11 Adsorption zone 3, 12 Desorption zone 4, 13 Sensible heat exchange rotor 5, 14 First flow path 6, 15 Second flow path 7, 8 Evaporative cooler 9, 16 Heater

Claims (2)

Outside air dehumidified in the first dehumidification rotor, the adsorption heat Thus dry air raised in temperature due to the dehumidification lower the temperature by the outside air and that the first sensible heat exchanger rotor sensible heat exchange, the drying air lowered in temperature Furthermore dehumidified in the second dehumidification rotor, lowering the temperature by sensible heat exchange adsorption heat Thus dry air rose temperature by dehumidified indoor air and the second sensible heat exchange rotor, so as to supply to the room The outside air that has passed through the first sensible heat exchange rotor and has risen in temperature is heated by a first heater to be desorbed air from the first dehumidifying rotor, and passes through the second sensible heat exchange rotor. A desiccant air conditioner characterized in that a part of the indoor air whose temperature has risen is discharged to the atmosphere and the remaining air is heated by a second heater to be desorbed air of the second dehumidifying rotor . The desiccant air conditioner according to claim 1, wherein the desiccant air conditioner is cooled by evaporative cooling means before supplying the dry air into the room.

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