JP2002224529A - Dehumidification air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dehumidification air conditioner efficiently functioning also utilizing a latent heat in a waste heat of a low temperature of a boiler of a low temperature or the like. SOLUTION: A sensible heat exchanger 4 is divided to areas 5, 13 for carrying out a heat exchange between a dry air and an indoor air and an area 17 for carrying out a sensible heat exchange between an air from a waste heat supply source and a reflux air from an indoor. The indoor air heat-exchanged with the air from the waste heat supply source is fed to a desorption zone 19 of an adsorption rotor 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehumidifying air conditioner capable of performing high-efficiency air conditioning even with low-temperature waste heat such as boiler waste heat.

[0002]

2. Description of the Related Art A dehumidifying air conditioner dehumidifies or absorbs the humidity of the outside air to produce dry air, which is cooled and supplied. Such dehumidifying air conditioners do not use chlorofluorocarbon, and use heat as a driving energy source, so they can use a variety of energies such as gas combustion heat, exhaust heat, or solar heat, thereby reducing carbon dioxide emissions. It has many features, such as the ability to reduce power peaks in summer.

A conventional dehumidifying air conditioner will be described with reference to FIG. Reference numeral 1 denotes a blower that sends atmospheric OA to an adsorption zone 3 of a dehumidifying rotor 2. As a result, the air increases in temperature and becomes dry air. Here dehumidifying rotor 2
Is made by carrying a hygroscopic agent such as silica gel or zeolite on paper formed in a honeycomb shape, and is rotationally driven by a motor (not shown) through a belt or the like (not shown). is there.

[0004] The air leaving the adsorption zone 3 of the dehumidifying rotor 2 passes through one of the passages 5 of the orthogonal sensible heat exchange element 4, thereby lowering the temperature of the dry air. Here, as shown in FIG. 2, the orthogonal sensible heat exchange element 4 alternates between a wave-shaped aluminum foil or synthetic resin film and a planar aluminum foil or synthetic resin film, and the wave direction is alternated. It has two passages orthogonal to each other, and sensible heat exchange is performed between each passage. Further, the gases passing through the two passages do not mix with each other.

[0005] The dry air that has exited one passage 5 of the orthogonal sensible heat exchange element 4 enters a water spray nozzle 6. Water spray nozzle 6
In this technique, water is sprayed on air passing therethrough and cooled by heat of vaporization of water. The air whose temperature has dropped further from the water spray nozzle 6 is supplied indoors as supply air SA.

[0006] The air RA in the room is sucked by the blower 7 and firstly enters a pipe provided with a water spray nozzle 8. Since indoor air is not generally 100% relative humidity, water is vaporized and cooled by the water spray nozzle 8.

[0007] The air cooled by the water spray nozzle 8 passes through the other passage 9 of the orthogonal sensible heat exchange element 4, and the temperature of the one passage 5 of the orthogonal sensible heat exchange element 4 is decreased and the temperature is increased. To enter the heater 10. Here heater 1
Numeral 0 denotes a gas burner for burning a combustible gas such as natural gas or propane gas or a radiator for passing hot water.
Alternatively, if the heater 10 is a heating means, the heater 10 may be a means such as a high-temperature exhaust gas from another combustion device or a mixed gas of the high-temperature exhaust gas and air.

The air heated by the heater 10 is
The moisture adsorbed by the desiccant of the dehumidifying rotor 2 passes through the desorption zone 11 of the dehumidifying rotor 2, and is desorbed by the blower 7 to the atmosphere as exhaust EA.

[0009]

In the conventional dehumidifying air conditioner as described above, the dehumidifying rotor 2 is attached and detached by air heated through the heater 10. In order to perform desorption of the dehumidification rotor 2, the air passing through the desorption zone 11 needs to have a lower relative humidity than the air passing through the adsorption zone 3, and the larger the difference between the relative humidity, the higher the desorption effect.

Therefore, it is difficult to perform desorption by sending a gas having a high relative humidity and a temperature of about 90 to 100 ° C. to the desorption zone 11, such as the exhaust gas of a gas boiler,
There is a problem that it is difficult to use such waste heat of exhaust gas.

A micro gas turbine generator which burns natural gas, which has attracted particular attention in recent years, is configured to produce and supply hot water with the heat of exhaust gas in order to increase energy efficiency. The exhaust gas has a relative humidity of almost 100% and a temperature of about 90 to 100 ° C., and it is extremely difficult to attach and detach the dehumidifying rotor 2.

In such a device, by supplying hot water together with power generation, the overall thermal efficiency becomes about 70%, but the remaining 30% of energy is released as heat from exhaust gas. If air conditioning is used, the overall thermal efficiency will exceed 95%.

An object of the present invention is to provide a dehumidifying air conditioner which exhibits a highly efficient air conditioning function by utilizing heat of exhaust gas of a boiler or a cogeneration micro gas turbine generator having a low temperature and a high relative humidity.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a sensible heat exchanging means for exchanging heat between dry air and room air, and a method for exchanging air from a waste heat supply source. It was divided into a region where sensible heat was exchanged with the return air from the room, and the room air that had sensible heat exchanged with the air from the waste heat supply source was supplied to the desorption zone of the adsorption rotor.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a humidifying cooling means for humidifying and cooling air from a room, and a humidifying and cooling means for supplying air to the room from the humidified and cooled air from the room. It has a sensible heat exchange means for exchanging sensible heat, and a dehumidifying rotor for adsorbing and drying the moisture of the outside air sent to the sensible heat exchange means, and between the return air from the room and the hot air from the waste heat generation source. A part of the sensible heat exchange means is divided so as to exchange sensible heat, and the dehumidifying rotor is desorbed by the return air from the heated room passing through the divided part of the sensible heat exchange means area. In addition, when the hot air from the exhaust heat generation source is humid, the air desorbed from the dehumidifying rotor is heated by the latent heat of the hot air.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dehumidifying air conditioner according to the present invention will be described below in detail with reference to FIG. Here, a conventional dehumidifying air conditioner is used for the blower 1, the dehumidifying rotor 2, the adsorption zone 3, the orthogonal sensible heat exchange element 4, the one passage 5, the blower 7, the water spray nozzle 8, the other passage 9, and the desorption zone 11. 3, which is the same as FIG. 3, and redundant description is omitted to avoid redundancy.

Reference numeral 12 denotes a first partition plate, which divides the entrance of the other passage 9 of the orthogonal sensible heat exchange element 4 into a non-humidifying passage 13 and a humidifying passage 14. And the divided humidification passage 14
Is provided with a water spray nozzle 8. The spray amount by the water spray nozzle 8 is set to a state in which fine particles of water float in air having a relative humidity of 100%. Here, the return air from the room flows through both the non-humidifying passage 13 and the humidifying passage 14.

Reference numeral 15 denotes a second partition plate, which divides the entrance of one passage 5 of the orthogonal sensible heat exchange element 4 into a non-heating passage 16 and a heating passage 17. The air that has passed through the adsorption zone 3 of the dehumidifying rotor 2 is passed through the non-heating passage 16,
An exhaust gas pipe 22 of a micro gas turbine (not shown) communicates with 7.

Reference numeral 18 denotes an exhaust passage, and the outlet of the humidifying passage 14 and the outlet of the heating passage 17 are open. Reference numeral 19 denotes a desorption passage, which communicates with the outlet of the non-humidifying passage 13. The blower 7 sends air out of both the desorption passage 19 and the exhaust passage 18 to the outside.

The exhaust passage 18 has a slanted bottom surface to facilitate the drainage of the condensed water accumulated therein. A diffuser 20 for separating water and water is provided at an outlet of the exhaust passage 18, and a valve 21 for adjusting a ratio of an amount of air passing through the desorption passage 19 and the exhaust passage 18 is provided.

The dehumidifying air conditioner of the present invention is configured as described above, and its operation will be described below.

The blowers 1 and 7 are started, and then the micro gas turbine is ignited to send water to the water spray nozzle 8. Then, the outside air OA is sucked into the blower 1 and enters the blower 1, is pushed out by the blower 1 and enters the adsorption zone 3 of the dehumidifying rotor 2. Here, the humidity of the outside air is adsorbed by the dehumidifying rotor 2,
It becomes dry air and the temperature rises due to heat of adsorption.

The heated dry air enters the non-heating passage 16 of one passage 5 of the orthogonal sensible heat exchange element 4. Here, the dry air gives its sensible heat to the orthogonal sensible heat exchange element 4, and the temperature falls. That is, the temperature of the dry air that has flowed out of the non-heating passage 16 of the orthogonal sensible heat exchange element 4 decreases due to the indoor air RA and the heat of vaporization of the water sprayed by the water spray nozzle 8, and becomes comfortable supply air SA. Supplied.

The indoor air RA is supplied to the non-humidifying passage 1 of the other passage 9 of the orthogonal sensible heat exchange element 4 by suction of the blower 7.
3 and enter the humidification passage 14. Then, the gas passes through the desorption passage 19 and the exhaust passage 18, enters the suction port of the blower 7, and is discharged to the atmosphere.

That is, a part of the indoor air RA is supplied to the cooling passage 1.
4, the air in the cooling passage 14 is humidified by the water spray nozzle 8 to lower the temperature, and the fine particles of water float.

The fine particles of water are vaporized by the air passing through one of the passages 5 of the orthogonal sensible heat exchange element 4 while passing through the cooling passage 14, take the heat of vaporization, and enter the exhaust passage 18. Since only the sensible heat exchange is performed between the one passage 5 and the other passage 9 of the orthogonal sensible heat exchange element 4 and there is no mixing of the two gases, the air in the one passage 5 and the cooling passage 14 are naturally formed.
There is no mixing with the air inside. Therefore, the air passing through one passage 5 of the orthogonal sensible heat exchange element 4 is cooled without being humidified.

Here, this cooling will be described in detail. The cooling effect is high near the entrance of the cooling passage 14, and the heat exchange here is performed by the air in the cooling passage 14 and the non-heating passage 16.
Done with the air inside. Therefore, the temperature in the non-heating passage 16 is effectively lowered, and the non-heating passage 16 is supplied indoors.

On the other hand, the exhaust gas of the micro gas turbine contains a large amount of water due to the oxidation of hydrogen atoms in the fuel.
If the fuel is natural gas, the moisture will be highest and the relative humidity of the exhaust gas will be almost 100%. Therefore, when this air exchanges sensible heat with room air passing through the non-cooling passage 13, the moisture in the exhaust gas condenses.

Therefore, the exhaust gas has a temperature of 90 to 100 ° C.
The room air passing through the non-cooling passage 13 is heated by the sensible heat and the latent heat of the air and enters the desorption zone 19. In other words, the indoor air RA is more effectively heated than just heated by sensible heat and enters the desorption zone 19, so that even if the temperature of the exhaust gas is not so high, the indoor air RA has a temperature sufficient to desorb the moisture of the dehumidifying rotor 2. Become.

For example, if air at a temperature of 100 ° C. and a humidity of 40% is changed to a temperature of 70 ° C. and a humidity of 100% by heat exchange, the temperature changes only by 30 ° C., but the calorie difference is 107 Kcal and a large energy Can be taken out. This is only 30 ° C
4 to 5 times as much energy as in the case where there is a temperature difference of

The temperature of the air passing through the heating passage 17 of the orthogonal sensible heat exchange element 4 rises to 85 ° C. and passes through the desorption zone 11 of the dehumidification rotor 2 to desorb the moisture contained in the dehumidification rotor 2. I do. The high-temperature and high-humidity air that has left the desorption zone 11 of the dehumidifying rotor 2 passes through the blower 7 to be exhausted EA and is released to the atmosphere. The air that has passed through the exhaust passage 18 is also blown by the blower 7 so that the desorption zone 11
Together with the high-temperature and high-humidity air that has exited, is emitted to the atmosphere as exhaust EA.

By adjusting the valve 21, the amount of air flowing into the exhaust passage 18 can be adjusted, and the temperature of the supply air SA can be controlled by this adjustment and the amount of spray from the water spray nozzle 8. it can.

In the above embodiment, the room air RA is supplied to both the non-humidifying passage 13 and the humidifying passage 14. However, if the amount of air is insufficient, the outside air is supplied to the humidifying passage 1.
4 may be supplied.

Although an example has been described in which exhaust gas passing through a hot water boiler of a micro gas turbine is used as an exhaust heat source, exhaust gas from a direct combustion boiler may be used.

Further, although an example of an orthogonal heat exchange element has been described as a stationary sensible heat exchange element, an element having an oblique flow direction or an element having an opposite flow direction can be used.

[0036]

The dehumidifying air conditioner of the present invention uses air having an absolute humidity higher than the absolute humidity of the indoor air as hot air from the exhaust heat generation source, and exchanges sensible heat between the high temperature / humid air and the indoor air. The dehumidifying rotor can be attached and detached using not only the sensible heat of the high-temperature and high-humidity air supplied from the exhaust heat source, but also the latent heat, and the temperature of the air from the exhaust heat source can be reduced. Even if it is low, sufficient desorption can be performed. That is, it is possible to use exhaust heat, such as the exhaust heat of a boiler, which has been conventionally difficult to use.

Moreover, since the temperature of the supply air is lowered by sensible heat exchange, the air of high comfort can be supplied without increasing the humidity of the supply air. Since the latent heat is recovered by means of the sensible heat exchange, the number of parts is small and the structure is simple.

By dividing the area of one static sensible heat exchange element, exhaust heat recovery (cooling of supply air by indoor cold air), indirect vaporization cooling, and recovery of latent heat from an exhaust heat source are performed. It can be realized compactly and at low cost.

In particular, since a static sensible heat exchange element is used as the heat exchanger, no moisture is introduced between the gases to be exchanged, and the humidity of the supplied air can be kept low.

When the humidity of the outside air is low, humidification cooling can be added, and in this case, the temperature of the supply air can be further lowered.

[Brief description of the drawings]

FIG. 1 is a flowchart showing Embodiment 1 of a dehumidifying air conditioner of the present invention.

FIG. 2 is a perspective view showing an orthogonal heat exchanger used in a dehumidifying air conditioner used in the present invention.

FIG. 3 is a flowchart showing an example of a conventional dehumidifying air conditioner.

[Explanation of symbols]

 Reference Signs List 1 blower 2 dehumidifying rotor 3 adsorption zone 4 orthogonal sensible heat exchange element 5 one passage 7 blower 8 water spray nozzle 9 the other passage 11 desorption zone 12 first partition plate 13 non-humidification passage 14 humidification passage 15 second partition plate 16 Non-heating passage 17 Heating passage 18 Exhaust passage 19 Detachment passage 20 Diffuser 21 Valve 22 Exhaust gas pipe

Claims (4)

[Claims] 1. A humidifying cooling means for humidifying and cooling air from a room, a sensible heat exchanging means for sensible heat exchange between humidified and cooled air from the room and air supplied to the room, A dehumidifying rotor for adsorbing and drying the moisture of the outside air sent to the means, and a part of the sensible heat exchange means for exchanging sensible heat between the return air from the room and the hot air from the waste heat source. The dehumidifying air conditioner is characterized in that the dehumidifying rotor is desorbed by a return air from a heated room that has passed through a part where the sensible heat exchange means has been divided. 2. A dehumidifying air conditioner according to claim 1, wherein said sensible heat exchange means is a static heat exchanger. 3. The dehumidifying air-conditioning apparatus according to claim 2, wherein the passage area of the sensible heat exchange means through which the return air from the room passes is divided into a plurality of sections, and at least one of the sections is provided with a humidification cooling means. 4. The dehumidifying air conditioner according to claim 3, wherein outside air is mixed into the air humidified and cooled by the humidifying cooling means.