JP3131813B2 - Dehumidification type air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehumidification type air conditioner of the type in which water is removed by using reactions such as absorption and adsorption.

[0002]

2. Description of the Related Art The characteristic of the season in Japan is that the summer becomes hot and humid. For this reason, in summer air conditioning in Japan, not only removal of sensible heat that lowers the temperature but also removal of latent heat that discards excess moisture is an important factor.

The first method of reducing the humidity of air is a method of performing cooling and dehumidification. To remove latent heat, it is necessary to cool the air to a temperature lower than a required dew point. However, when the load is low in the middle period or the like and the blowing temperature is high due to the restriction of the air volume of a VAV (air volume variable device), the dehumidification cannot be performed, or reheating is required although it is not energy saving. Although the efficiency of the refrigerator can be increased by increasing the temperature, if the air conditioner is of the cooling and dehumidifying type, it is not possible to increase the temperature of the chilled water even if the blowing temperature can be increased due to the problem of dehumidification described above.

[0004] A second method of reducing the humidity of air is absorption,
This is a method of removing water using a reaction such as adsorption. In this case, since the temperature of the air is rather increased by the heat of the reaction, dry air can be obtained with cold water at the same level as the target temperature. A conventional example of this method will be described with reference to FIGS. FIG. 7 is a configuration diagram, and FIG. 8 is a diagram showing a state of air on the psychrometric chart.

In FIG. 7, the dehumidifying rotor 1 is made of a material having a high hygroscopic property, and the moisture in the outside air is adsorbed and desorbed into the hygroscopic material by the dehumidifying rotor 1 to be dehumidified. After being cooled by the sensible heat of the exhaust gas in the sensible heat exchanger 2 and humidified as required by the humidifying cooler 3, it is sent to the mixer 4 where it is mixed with a part of the exhaust gas from the living room 6 and further cooled. It is cooled by the coil 5 and supplied to the living room 6. Living room 6
The remaining exhaust gas is heated by the sensible heat exchanger 2 and further heated by the regenerative heater 7, and then flows to the dehumidifying rotor 1 to dry and regenerate the hygroscopic material and exhaust.

[0006]

The above dehumidification type air conditioner has an extremely low humidity (dew point of 0.degree.
The following is used when air is required, but is rarely used for air conditioning in ordinary buildings. The reason is that the efficiency is low when considered as an air conditioner.

When this system is evaluated as a refrigerator (equipment for lowering the calorific value of air), the ratio (COP) between the amount of heat input and the amount of heat that can be removed (latent heat, sensible heat) is approximately 0.3 to 0. .4. Considering the summer environment in Japan, it is necessary to remove sensible heat at the same time as removing latent heat (humidity), so it is difficult to air-condition this system alone. They will be used in combination.

However, if a heat source is provided for this system, the improvement in COP due to an increase in the temperature of the chilled water of the refrigerator is expected from the aforementioned low COP,
The total COP worsens rather. That is,
When this system is used in the building air conditioning field, it is a precondition that other exhaust heat can be used.

By the way, the above-mentioned method employs the functions of adsorption and desorption, so that the degree of dryness (outlet humidity) of the obtained air depends on the inlet humidity of the processing-side incoming air and the temperature / humidity of the regenerating-side air. to be influenced. Therefore, in order to obtain practical low-humidity air in the humid Japanese summer, hot water of 80 ° C. or higher is required as a heat source. However, at this temperature level, the range of exhaust heat is limited. In this temperature range, there is a hot water-fired absorption refrigerator, but this device is not used much because it is expensive.

On the other hand, in recent years, a cogeneration system for supplying electric power and heat by operating a power generation device such as a fuel cell, a steam turbine, a gas engine or the like has been adopted, and the temperature level of exhaust heat of this system has been considered. In most cases, 60 ° C ~
It is concentrated in the range of 80 ° C. In this temperature range, the COP of the hot water-fired absorption refrigerator becomes low. Therefore, in the present summer, it is found only for hot water supply in summer and most of it is wasted.

The present invention has been made to solve the above-mentioned problems, and a dehumidification type air conditioner which can obtain practical low humidity air by utilizing abundant low level exhaust heat discarded in a cogeneration system or the like. It is an object of the present invention to provide a device capable of increasing the chilled water temperature of the air conditioning system by utilizing the exhaust heat at the cogeneration level and improving the COP of the refrigerator by combining the above and the above.

[0012]

For this purpose, the dehumidification type air conditioner of the present invention comprises an auxiliary cooling coil 9 for cooling the introduced outside air, and the moisture in the outside air passing through the auxiliary cooling coil 9 is contained in the hygroscopic material. A dehumidifying rotor 1 for adsorbing and desorbing, a sensible heat exchanger 2 for exchanging external air passing through the dehumidifying rotor 1 with exhaust gas,
A cooling coil 5 for cooling the outside air passing through the sensible heat exchanger 2 and supplying the cooling air to the living room 6, and a dehumidifying rotor 1 for heating the exhaust air from the living room 6
A regenerative heater 7 for drying and regenerating the hygroscopic material, a generator 11 and a hot-water-absorbing absorption chiller 12. Hot water is produced by exhaust heat generated by the generator 11. The cooling water is circulated to the cooling coil 5 while being circulated to the cooling device 12 and the regeneration heater 7. Note that the numbers added to the above configuration are compared with the drawings to facilitate understanding of the present invention, and the configuration of the present invention is not limited by this.

[0013]

[0014]

[0015]

According to the present invention, the temperature and the temperature are controlled by a total heat exchanger or an auxiliary cooling coil in which the introduced outside air undergoes total heat exchange with the exhaust gas.
After lowering the humidity, the remaining moisture in the outside air is adsorbed in the hygroscopic material by the dehumidifying rotor to reduce the humidity, and the heat that has increased due to the adsorption reaction is removed by the sensible heat exchanger, and then the cooling coil and the like are removed. Cooled by the cooling device and supplied to the living room,
Exhaust gas from the living room is heated by the regenerative heater after remaining heat in the sensible heat exchanger, flows to the dehumidifying rotor, and dries the hygroscopic material.
It is regenerated and exhausted.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of a dehumidification type air conditioner of the present invention, and FIG. 2 is an air line diagram for explaining its operation.

In FIG. 1, the introduced outside air is first subjected to sensible heat exchange and latent heat exchange with the exhaust air from the living room 6 in the total heat exchanger 8 to reduce the temperature and humidity of the outside air. The dehumidifying rotor 1 is made of a material having a high hygroscopic property, and moisture in the outside air passing through the total heat exchanger 8 is adsorbed and desorbed in the hygroscopic material by the dehumidifying rotor 1 to be dehumidified. After being cooled by the sensible heat of the exhaust gas in the sensible heat exchanger 2 and humidified by the humidifying cooler 3 if necessary, it is sent to the mixer 4 where it is sent to the living room 6.
Is mixed with a part of the exhaust gas from the air conditioner, further cooled by the cooling coil 5 and supplied to the living room 6. The remaining exhaust gas from the living room 6 is heated by the sensible heat exchanger 2 and further heated by the regenerative heater 7, and then flows to the dehumidifying rotor 1 to dry and regenerate the hygroscopic material and exhaust.

In FIG. 2, the solid line indicates the case according to the present embodiment and the dotted line indicates the case according to the conventional method. When the regeneration temperature of the dehumidifying rotor 1 is set to 55 ° C., a sufficient dehumidifying effect can be obtained by the conventional method. However, in this example, a practical moisture reducing effect was obtained.

FIG. 3 is a block diagram showing another embodiment of the dehumidification type air conditioner of the present invention, and FIG. 4 is an air line diagram for explaining the operation. In the following embodiments, the same components as those in the embodiment of FIG.

In the present embodiment, an auxiliary cooling coil 9 is provided in a stage preceding the dehumidifying rotor 1 so that the outside air on the processing side is lightly dehumidified. Since the auxiliary cooling coil 9 uses cold water at a temperature of about 15 to 18 ° C., which is higher than normal cooling and dehumidification, it is effective when cold water in this temperature range can be obtained at low cost in combination with other equipment. System.

In FIG. 4, the solid line shows the case according to the present embodiment and the dotted line shows the case according to the conventional method.
By cooling the inlet air temperature of the dehumidifying rotor 1 to 20 ° C. by the auxiliary cooling coil 9, a sufficient dehumidifying effect is obtained. When the regeneration temperature of the dehumidifying rotor 1 is set to 55 ° C., the conventional method is not sufficient. It can be seen that a practical dehumidifying effect was obtained in the present example, while no significant dehumidifying effect was obtained.

FIG. 5 is a block diagram showing another embodiment of the dehumidification type air conditioner of the present invention. In this embodiment, FIG.
Instead of the cooling coil 5, an air conditioner 10 for removing sensible heat is employed. In this case, since the latent heat load is not applied to the air conditioner 10, cold water of about 13 to 15 ° C. is used.

Table 1 shows a comparison between the present embodiment and the conventional ordinary air conditioner with a total heat exchanger shown in FIG. The daily load indicates a case where the daily operation is from 9:00 to 18:00, and the annual load indicates a case where the period is from May to October and the operation is 25 days on an average weather day. The unit of the load is Kcal.
/ M ² .

[0024] As can be seen from Table 1, the refrigerator load can be reduced by about 20% throughout the summer. However, this numerical value is a load as a calorific value, and it is necessary to consider COP in order to convert it into power. The COP of the refrigerator increases as the temperature of the cold water increases.

Table 2 shows design calculation values of the chilled water temperature in the cooling coil under the trial calculation conditions of Table 1.

[0026] As shown in Table 2, in the system using adsorption dehumidification, the cold water temperature can be raised by about 2 to 3 ° C. However,
In the existing adsorption and dehumidification system described with reference to FIG. 7, operation at a lower chilled water temperature is required to prevent insufficient cooling and dehumidification capabilities. For this reason, it is considered that the temperature difference between the two widens to about 3 to 5 ° C. When this temperature difference is converted to COP, the improvement is 10 to 20% in the case of the absorption refrigerator.
Therefore, it is possible to reduce the energy by 30% or more in total.

FIG. 6 shows another embodiment of the present invention.
FIG. 2 is a configuration diagram in which the dehumidifying air conditioner of FIG. 1 is combined with a generator 11 and a hot-water-fired absorption refrigerator 12. FIG.
The same reference numerals are given to the same components as those of the embodiment, and the description is omitted.

In this embodiment, hot water is produced by the exhaust heat generated by the generator 11, and the hot water is circulated to the hot water-absorbing absorption refrigerator 12 and the regenerative heater 7, and the cold water produced by the absorption refrigerator 12 is produced. Is circulated to the air conditioner 10. In the present embodiment, low-temperature hot water, which has been conventionally used only for hot water supply and heating, can be used for cooling and dehumidification, so that the summer heat of Cogene can be effectively used. In addition, the COP can be improved as the temperature of the chilled water of the absorption refrigerator 12 rises, and the effective use of heat can be increased comprehensively.

Further, when a fuel cell is used as the power generator 11, the method is more effective. A fuel cell is a power generation system that uses clean natural gas as fuel to directly generate electricity through a chemical reaction. However, the current phosphoric acid type fuel cell has a low exhaust heat temperature of about 60 ° C, and can be used for purposes other than hot water supply and heating. There was no. However, by applying the fuel cell to the present invention, the total energy use efficiency in summer can be increased.

[0030]

As is apparent from the above description, according to the present invention, after the temperature and humidity are reduced by the auxiliary cooling coil in which the introduced outside air is totally heat-exchanged with the exhaust, the remaining moisture in the outside air is reduced. In the wet rotor, the moisture is absorbed into the hygroscopic material to reduce the humidity, and the heat that has risen by the adsorption reaction is removed by a sensible heat exchanger, and then cooled by a cooling device such as a cooling coil and supplied to the living room. The exhaust from the living room is heated by the regenerative heater after remaining heat in the sensible heat exchanger, flows to the dehumidifying rotor, and dries and regenerates the hygroscopic material.
At the same time as obtaining practical dry air by utilizing the abundant low-level waste heat discarded in the Cogene system etc.,
By raising the temperature of the cold water produced by the refrigerator, the COP of the refrigerator can be improved. In addition, since low-temperature hot water, which was conventionally used only for hot water supply and heating, can be used for cooling and dehumidification, it is possible to effectively use the exhaust heat of Kojene during the summer, and As the temperature rises, the COP is improved, and the effective use of heat can be increased comprehensively.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a dehumidification type air conditioner of the present invention.

FIG. 2 is a psychrometric chart for explaining the operation of the embodiment of FIG. 1;

FIG. 3 is a configuration diagram showing another embodiment of the dehumidification type air conditioner of the present invention.

FIG. 4 is a psychrometric chart for explaining the operation of the embodiment of FIG. 3;

FIG. 5 is a configuration diagram showing another embodiment of the dehumidification type air conditioner of the present invention.

FIG. 6 is a configuration diagram in which the dehumidification-type air conditioner of the present invention is combined with a cogeneration and an absorption refrigerator.

FIG. 7 is a configuration diagram showing one embodiment of a conventional dehumidification type air conditioner.

FIG. 8 is an air line diagram for explaining the operation of FIG. 7;

FIG. 9 is a configuration diagram showing a conventional air conditioner with a total heat exchanger.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Dehumidification rotor, 2 ... Sensible heat exchanger, 3 ... Humidification cooler, 4
... Mixer 5 ... Cooling coil, 6 ... Room, 7 ... Regeneration heater, 8 ... Total heat exchanger 9 ... Auxiliary cooling coil, 10 ... Air conditioner, 11 ... Generator 12 ... Hot water-fired absorption refrigerator

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24F 3/147 F24F 3/044 B01D 53/26 101

Claims (1)

(57) [Claims] 1. An auxiliary cooling coil for cooling introduced outside air, a dehumidifying rotor for adsorbing and desorbing moisture in the external air passing through the auxiliary cooling coil into and from a hygroscopic material, and an external air passing through the dehumidifying rotor. A sensible heat exchanger for exchanging heat with the exhaust gas, a cooling coil for cooling the outside air passing through the sensible heat exchanger and supplying air to the living room, and heating the exhaust gas from the living room to dry the hygroscopic material of the dehumidifying rotor A reheater to be regenerated, a generator and a hot water-fired absorption refrigerator, producing hot water by exhaust heat generated by the power generator, and circulating the hot water to the hot water-fired absorption refrigerator and the regeneration heater. A dehumidification-type air conditioner, wherein cold water produced by the absorption refrigerator is circulated through the cooling coil.