JPH08141353A - Dehumidifier - Google Patents

Abstract

PURPOSE: To provide a dehumidifier which operates to dehumidify stably during an intermediate period, especially a rainy season, and at low running cost. CONSTITUTION: An adsorptive desiccant rotor 5 filled with an adsorptive desiccant is provided across a treatment air flow path 1 and a regeneration air flow path 2, and a dehumidification cooler 4 is installed on the upstream side of a rotor for the treatment air flow path. In addition, a preheater 8 to which a high temperature gas coolant is supplied from a compressor and a heater 9 which heats the regenerated air heated by the preheater to the adequate level of temperature for the regeneration of the adsorptive desiccant, are installed on the upstream side of a rotor for the regenerated air flow path, and a heat exchanger 10 for waste heat recovery is provided on the downstream side. Further, a forward coolant branch pipe 16b with an operating valve 21 branching out from a forward coolant pipe 16a to the dehumodification cooler 4 is connected to the heat exchanger 10 for waste heat recovery through an expansion valve 18. A backward coolant branch pipe 19b from the heat exchanger is connected to a backward coolant pipe 19a from the dehumidification cooler 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehumidifying device using both cooling type desorption and adsorption type dehumidification.

[0002]

2. Description of the Related Art As a method for dehumidifying air, there are various types such as a cooling type, an adsorption type and the like, and a dehumidifying device which is a single type or a combination of these types has been put into practical use. Among them, the cooling type is a method of cooling the air to condense and separate the moisture in the air to dehumidify it, and is suitable for dehumidifying high-temperature and high-humidity air. It is lower than the conventional method and is most often used in dehumidification in high temperature regions (dew point temperature of 4 ° C or higher).

In the adsorption type, air is passed through an adsorption desiccant,
A method of dehumidifying by absorbing the moisture in the air with a desiccant,
Dehumidification is performed while regenerating the desiccant by passing hot air through it. In the adsorption-type dehumidifier, for example, a processing air flow path through which the air to be processed flows and a regeneration air flow path through which hot air flows are provided across a rotor filled with a desiccant, and the desiccant is processed by rotating the rotor. For example, there is one that alternately adsorbs moisture and regenerates the desiccant by alternately contacting air and regenerated air, which has the characteristic that air with a low dew point can be obtained.

[0004]

In the case of a cooling type dehumidifier, when the outside air temperature is high, a sufficient heat load is applied to the refrigerant in the dehumidifying cooler, so that the operation of the compressor is not hindered. When the air temperature is low, the refrigerant is not heavily loaded with heat, the suction side pressure of the compressor decreases, and the compressor stops.

Therefore, in the middle of the season, especially during the rainy season, when stable dehumidification is required, the pressure on the suction side of the compressor decreases due to the low outside air temperature, and the compressor stops and the dehumidifying capacity is reduced. There is a problem of decrease.

Further, in the adsorption type dehumidifier, since the air for regenerating the desiccant is heated by an electric heater or the like, there is a problem that energy cost required for heating becomes high.

[0007]

In order to solve the above-mentioned problems, a dehumidifying apparatus according to the present invention is an adsorption desiccant rotor filled with an adsorption desiccant and driven to rotate by a motor. Provided so as to straddle the process air flow path leading to the outlet and the regeneration air flow path extending from the regeneration air inlet to the exhaust port, and the liquid refrigerant passing through the expansion valve from the liquid receiver on the upstream side of the rotor of the processing air flow channel. A dehumidifying cooler to be fed is provided, and a preheater to which a high temperature gas refrigerant from a compressor is supplied on the upstream side of the rotor of the regeneration air flow path,
A heater for further heating the regenerated air heated by the preheater to a temperature sufficient for regenerating the adsorbent desiccant, and a heat exchanger for recovering waste heat on the downstream side are respectively provided, and the refrigerant to the dehumidifying cooler is provided. Branching from the forward pipe, a refrigerant forward branch pipe having an on-off valve is connected to the waste heat recovery heat exchanger via an expansion valve,
The refrigerant return pipe from the heat exchanger is connected to the refrigerant return pipe from the dehumidifying cooler.

[0008]

The air to be treated flowing through the treatment air passage is cooled by the dehumidifying cooler, and the moisture in the air is condensed and separated.
The air dehumidified by the dehumidifying cooler is further adsorbed by the adsorption desiccant rotor to become dry air having a low dew point and supplied to the air-conditioned room.

On the other hand, the regenerated air from the air-conditioned room is heat-exchanged with the high-temperature gas refrigerant from the compressor supplied to the preheater to be preheated, and the heater is at a temperature sufficient to regenerate the adsorbed desiccant. The adsorbent desiccant rotor removes water from the adsorbent desiccant, regenerates the water adsorbing capacity of the adsorbent desiccant, and is discharged from the outlet through the waste heat recovery heat exchanger.

Further, by opening the on-off valve of the refrigerant outflow pipe, the liquid refrigerant from the liquid receiver is supplied not only to the dehumidifying cooler but also to the waste heat recovery heat exchanger, where it is regenerated. The temperature is raised. Since the gas refrigerant that has been heated and vaporized is sucked into the compressor, even if the outside air temperature is low and the dehumidifying cooler alone does not apply a sufficient heat load to the refrigerant, the suction side of the compressor The pressure is maintained at a predetermined level and the compressor operates stably. Therefore, even when the outside air is low in temperature and humidity such as in the rainy season, the dehumidifying ability does not decrease.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific examples of the dehumidifying device according to the present invention will be described below in detail with reference to the accompanying drawings. The dehumidifying device of the present invention includes a processing air flow path 1 for flowing air to be dehumidified and a regeneration air flow path 2 for flowing air for regenerating the adsorbent desiccant.

[0012] The treated air is discharged from the treated air blower 6 from the treated air outlet 1b through the prefilter 3 provided at the outside air intake 1a, the dehumidifying cooler 4 and the adsorption desiccant rotor 5 to the air-conditioned room. It is being supplied.

The regenerated air passes from the prefilter 7 provided at the regenerated air inlet 2a to the preheater 8, the electric heater 9, the adsorbent desiccant rotor 5, the waste heat recovery heat exchanger 10, and the regenerated air blower 11 from the exhaust port 2b. It is supposed to be discharged.

The adsorbent desiccant rotor 5 is provided so as to straddle the processing air flow path 1 and the regeneration air flow path. Its structure is, for example, as shown in FIG. The adsorbent desiccant container 23 whose opening is opened with a ventilation member such as a wire mesh 24 is set in the cylindrical body 5b, and the rotor is driven to rotate around the shaft 5a by the motor M. The desiccant comes into contact with the treatment air and the regeneration air alternately to repeat dehumidification of the treatment air and regeneration with hot air.

On the other hand, the hot gas refrigerant from the compressor 12 is sent to the preheater 8 by the discharge pipe 13, and the inlet 2
The regenerated air from a is heated, enters the condenser 14, is liquefied, and is stored in the liquid receiver 15. The liquid refrigerant from the liquid receiver 15 passes through the expansion valve 17 of the refrigerant outward pipe 16a and then passes through the dehumidifying cooler 4
The refrigerant from the cooler 4 is sucked into the compressor 12 from the suction pipe 20 through the refrigerant return pipe 19a.

A refrigerant outward branch pipe 16b having an opening / closing valve 21 is connected to the refrigerant outward pipe 16a. This on-off valve is closed during the summer when the outside air temperature is high and the refrigerant in the dehumidifying cooler 4 has a sufficient heat load, but the outside air temperature is low during the rainy season and the heat load on the refrigerant is high. The liquid refrigerant sent to the refrigerant outward branch pipe 16b is sent to the waste heat recovery heat exchanger 10 through the open / close valve 21 and the expansion valve 18 when it is not opened at high temperature. Heat load can be applied from regenerated air with high humidity. The refrigerant from the heat exchanger 10 is sucked into the compressor 12 from the suction pipe 20 via the refrigerant return pipe 19b.

In the dehumidifying apparatus of the present invention constructed as described above, the treated air has its pre-filter 3 provided at the outside air intake 1a to remove dust and is cooled by the dehumidifying cooler 4 to be contained in the air. Moisture is condensed and separated, cooled and dehumidified, and then further adsorbed and dehumidified by the adsorbent desiccant rotor 5 and discharged by the blower 6 from the treated air outlet 1b.

On the other hand, the regenerated air has its dust removed by the prefilter 7 provided at the regenerated air inlet 2a, and the preheater 8
In, the heat is exchanged with the high-temperature gas refrigerant from the compressor to heat the refrigerant, and the electric heater 9 heats it to a temperature necessary for regenerating the adsorbent desiccant.

The regenerated air heated by the preheater 8 and the electric heater 9 removes moisture from the desiccant by the adsorption desiccant rotor 5 to regenerate the moisture adsorbing ability of the desiccant, and regenerates through the waste heat recovery heat exchanger 10. Exhaust port 2b by air blower 11
Emitted from.

The open / close valve 21 provided in the refrigerant outflow pipe 16b is closed and used in the summer when the outside air temperature is high and the refrigerant is sufficiently heated by the dehumidifying cooler.

In this case, the high-temperature gas refrigerant from the compressor 12 is sent to the preheater 8 by the discharge pipe 13, heats the regenerated air from the regenerated air inlet 2a, and is condensed in the condenser 14 to become the refrigerant liquid, which is received. It is stored in the container 15.

The refrigerant liquid from the liquid receiver 15 is a refrigerant outward pipe 16a.
Is sent to the dehumidifying cooler 4 through the expansion valve 17, and the dehumidifying cooler 4 cools and dehumidifies the treated air from the outside air intake port 1a, applies a heat load, and is sucked into the compressor 12 from the suction pipe 20. It

On the other hand, when the outside air temperature is low and the dehumidifying cooler alone does not apply a sufficient heat load to the refrigerant, the on-off valve 21 provided in the refrigerant branch pipe 16b is opened and used.

In this case, the liquid refrigerant from the liquid receiver 15 passes through the expansion valve 18 of the refrigerant outward branch pipe 16b and the heat exchanger 1 for waste heat recovery.
0, and is subjected to heat exchange by exchanging heat with the hot and humid regenerated air that has passed through the adsorbent desiccant rotor.
It is sent from b to the suction pipe 20, is mixed with the refrigerant from the dehumidifying cooler 4, and is sucked into the compressor 12.

Therefore, even in the rainy season or the like when the outside temperature is low, the refrigerant sucked into the compressor can be sufficiently loaded with heat from the hot and humid regenerated air in the waste heat recovery heat exchanger. Without reducing the suction side pressure of the machine,
The compressor operates stably without stopping, so the dehumidifying capacity does not decrease.

In the above embodiment, the heater for raising the temperature of the regenerated air to a temperature sufficient to regenerate the adsorbent desiccant is composed of an electric heater, but other heaters such as a steam heater are used. You can also

[0027]

Since the dehumidifying device according to the present invention has the above-mentioned structure, the following effects can be obtained. A heat exchanger for recovering waste heat is provided on the exhaust port side of the regeneration air flow path so that the refrigerant returned to the compressor can be subjected to a heat load from the hot and humid regeneration air after processing the adsorbent desiccant. Therefore, even when the outside air temperature is low, the suction side pressure of the compressor does not decrease and the compressor does not stop, so that stable dehumidifying operation can be performed.

Further, since the regenerated air for regenerating the adsorbent desiccant is preheated by the high temperature gas refrigerant discharged from the compressor in the preheater, a heater such as an electric heater for heating the regenerated air to a required temperature is used. It is possible to provide a dehumidifying device that requires less heating energy and has a low running cost.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view showing an example of an adsorption desiccant rotor.

FIG. 3 is a sketch drawing showing an example of an adsorption desiccant container.

[Explanation of reference numerals] 1 treated air flow path 1a outside air intake 1b treated air outlet 2 regenerated air flow path 2a regenerated air inlet 2b exhaust port 3 prefilter 4 dehumidifying cooler 5 adsorbent desiccant rotor 5a shaft 5b cylindrical body 6 treatment Air blower 7 Pre-filter 8 Pre-heater 9 Electric heater 10 Heat exchanger for waste heat recovery 11 Regenerative air blower 12 Compressor 13 Discharge pipe 14 Condenser 15 Liquid receiver 16a Refrigerant forward pipe 16b Refrigerant forward pipe 17, 18 Expansion valve 19a Refrigerant return pipe 19b Refrigerant return pipe 20 Suction pipe 21 Open / close valve 22 Adsorption desiccant 23 Adsorption desiccant container 24 Wire mesh

Claims (1)

[Claims] 1. An adsorption desiccant rotor, which is filled with an adsorption desiccant and is driven to rotate by a motor, has a treatment air passage extending from an outside air intake to a treatment air outlet and a regeneration air passage extending from a regeneration air inlet to an exhaust outlet. And a dehumidifying cooler in which the liquid refrigerant is sent from the liquid receiver via the expansion valve to the upstream side of the rotor in the process air flow path, and the upstream side of the rotor in the regeneration air flow path Is a preheater to which high-temperature gas refrigerant is supplied from the compressor, and a heater that further heats the regenerated air heated by this preheater to a temperature sufficient to regenerate the adsorbent desiccant. Heat exchangers are respectively provided to branch from the refrigerant forward pipe to the dehumidifying cooler, and a refrigerant forward branch pipe having an on-off valve is connected to the waste heat recovery heat exchanger via an expansion valve. Dehumidifying the refrigerant return pipe from the exchanger Formed by connecting the refrigerant recovery pipe from the cooler dehumidifier.