JPH06294590A - Enthalpy exchanging device - Google Patents

Abstract

PURPOSE:To efficiently move sensible heat and latent heat held by high temperature side air to the low temperature side by the structure wherein the high temperature side and the low temperature side are completely separated from each other. CONSTITUTION:Water is sprayed into supply air through water spray nozzles 7 before the supply air reaches a cross flow heat exchanger 1, and the relative humidity reaches approximate 100%, while the temperature is lowered. The supply air flows into the heat exchanger 1, and moisture in the supply air is dewed. The supply air continues the change of state while maintaining the relative humidity 100% and changes into cold air having relative humidity of 100% at an outlet 4 of the heat exchanger 1. Dewing water flows to drain pans 8 on the lower part. On the other hand, return air from the inside of a room is supplied to a low temperature side air inlet 3 and receives water spray through the water spray nozzles 7 and changed along the wet bulb temperature line and flows into the heat exchanger 1 when it reaches the heat exchanger 1 and its relative humidity becomes about 100% and then absorbs moisture from flowing water on a heat-transfer surface by heat exchanging so as to maintain the saturated state. The state of return air reaches about 100% on the outlet 4 of the heat exchanger 1, and return air is discharged from a low temperature side air outlet 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an enthalpy exchange device for exchanging sensible heat and latent heat used for general air conditioning between high temperature gas and low temperature gas.

[0002]

2. Description of the Related Art Conventionally, a device as shown in FIG. 5 has been used as a heat exchange device for efficiently exchanging sensible heat and latent heat of air. That is, the conventional device is designed such that the rotor is filled with the heat transfer element, and the air flows in the axial direction of the rotor while being in contact with the heat transfer element. The air passing through the rotor is partitioned by a partition plate and a duct so that the high temperature air and the low temperature air do not mix directly.

However, the fact that a part of the air is actually conveyed from the high temperature side to the low temperature side and vice versa as the rotor rotates cannot be avoided by such a structure. . Moisture in the air is condensed and condensed on the surface of the heat transfer element, so that the water in the liquid phase is transported from the high temperature side to the low temperature side. That is, in the conventional technique, mass transfer occurs continuously while heat is exchanged between the high temperature side and the low temperature side. The presence of not only gas-phase air but also liquid-phase water as such a moving substance is becoming a problem in recent application fields of sensible heat and latent heat exchange devices. In many fields of application, it has been observed that mobile water is entrained by, for example, paint mist, ink mist, bacteria, microorganisms, fungi and other odorous substances. As an example, in the installation example in a hospital, it was pointed out that there is a risk that bacteria enter the air entering the room by performing heat exchange using such a device. This danger similarly exists even when a non-rotating (stationary) moisture permeation type sensible heat / latent heat exchanger is used in place of the rotary regeneration type heat exchanger shown in FIG. This is an issue that cannot be overlooked when considering the societal demand for preventing so-called nosocomial infections in hospitals.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and has a structure in which the high temperature side and the low temperature side are completely separated from each other and retains the high temperature side air. It is to provide a heat exchange device having a function of efficiently moving sensible heat and latent heat to a low temperature side.

[0005]

The enthalpy exchange apparatus of the present invention comprises a cross-flow heat exchanger, a water spray device installed on the high temperature gas inlet side of the cross-flow heat exchanger, and the cross-flow heat exchanger. A drain treatment device installed on the high temperature gas outlet side of the heat exchanger, a water spray device installed on the low temperature side gas inlet side of the cross flow type heat exchanger, and a low temperature side gas of the cross flow type heat exchanger And a drain treatment device installed on the outlet side. Also, a cross flow heat exchanger, a humidifier installed on the high temperature gas inlet side of the cross flow heat exchanger, a humidifier and water spray installed on the low temperature gas inlet side of the cross flow heat exchanger. It is also characterized in that it is configured by an apparatus and a drain treatment apparatus installed on the low temperature gas outlet side of the cross-flow heat exchanger. The surface of the heat transfer element filled in the cross-flow heat exchanger is coated with a hydrophilic substance. The hydrophilic substance is, for example, silica gel or zeolite.

[0006]

EXAMPLE An example will be described with reference to FIG. In this embodiment, the outside air is cooled by a heat exchanger and supplied to the room. For example, outside air having an air temperature of 32 ° C. and a relative humidity of 80% is supplied from the high temperature side air inlet 2 to the cross flow heat exchanger 1 by a blower (not shown). Before the supply air reaches the cross-flow heat exchanger 1, water is sprayed onto the supply air through the water spray nozzle 7. The spray of water raises the relative humidity of the supply air to almost 100%. Along with this, the temperature of the supply air drops and reaches 29 ° C. This change in the state of the supply air proceeds along the wet bulb temperature line of the air diagram.

The supply air which has reached almost saturation at 29 ° C. enters the cross-flow heat exchanger 1 and contacts the heat transfer element inside thereof to continue radiating heat. Due to this heat dissipation, water in the supply air is condensed. While maintaining the relative humidity at 100%, the supply air continues to change its state, and at the outlet 4 of the crossflow heat exchanger 1, the temperature changes to 22.5 ° C. and the relative humidity changes to 100%. Water generated by condensation flows to the drain pan at the bottom.

On the other hand, the return air from the room is supplied to the low temperature side air inlet 3 at an air temperature of 26 ° C. and a relative humidity of 50%. Here, water spray is received through the water spray nozzle 7. This causes the return air state to change along the wet bulb temperature line. At the time of reaching the cross-flow heat exchanger 1, the state of return air is 1
The temperature has changed to about 8.5 ° C and 100% relative humidity.

The return air enters the inside of the cross-flow heat exchanger 1 at a relative humidity of about 100%, where it comes into contact with the heat transfer element and absorbs heat by heat exchange from the running water on the heat transfer surface. Absorbs water and keeps it saturated. At the outlet of the cross-flow heat exchanger 1, the state of return air is 26 ° C, 100%
After reaching the vicinity, the return air is discharged from the low temperature side air outlet 5 in this state.

In the above process, both sensible heat and latent heat, that is, enthalpy, are exchanged extremely efficiently between the outside air and the return air via the cross-flow heat exchanger 1. The water supply control valve 6 is used to smoothly perform the above heat exchange. Water flowing down inside the cross-flow heat exchanger 1 is received by the drain pan 8 and discharged from the drainage port 10.
The flow rates of the outside air and the return air in this embodiment are 0.5 m / se.
It is about 2 m / sec from c.

In FIG. 2, another embodiment is shown.
The difference from the case in FIG. 1 is that in FIG.
That is, the humidifier 11 or a combination of the humidifier 11 and the water spray nozzle 7 is used instead of the water spray nozzle in FIG.

The states of the outside air and the return air in the embodiment shown in FIGS. 1 and 2 are illustrated on the air line as shown in FIG. The solid line shows the state change of the outside air (supply air), and the dotted line shows the state change of the return air.

In this example, the exchange amount of sensible heat and latent heat between the outside air and the return air, that is, the enthalpy exchange amount is 6.
It is 8 Kcal / Kg (dry). When supplying outside air and return air at a flow rate of 1000 m ³ / hr, the total heat exchange amount is
5000 Kcal / hr to 8000 Kcal / hr
It will be about.

An example of the cross-flow heat exchanger used in the apparatus of the present invention is shown in FIG. A cross-flow type honeycomb heat exchanger having a flute diameter (φ) of 2 mm to 5 mm and having a heat transfer surface coated with a corrosion-resistant coating agent mixed with a hydrophilic substance such as silica gel or zeolite is suitable. Aluminum foil, other metal foils, synthetic resin foils, and the like are suitable as materials for the liner and corrugate.

[0015]

【The invention's effect】

1) Instead of the conventional rotary regeneration heat exchanger,
Since the static cross-flow type honeycomb heat exchanger was used, the flow paths of the outside air and the return air were completely separated. As a result, there is no risk of mass transfer between the outside air and the return air. In practicing the present invention in a laboratory, hospital, factory office,
The entry of paint mist, ink mist, bacteria and other odorous substances into the indoor air supply was completely prevented.
This advantage is especially appreciated in hospital practice. This is because the prevention of nosocomial infections, which has received special attention in recent years, is guaranteed by the present invention. 2) Further, since it is a stationary type device, it does not require rotational power, so the running cost for operating the heat exchanger becomes low. Further, the maintenance of the device is easy and the parts replacement cost is reduced. 3) It has been found that the apparatus according to the present invention removes sulfur oxides and nitrogen oxides in a water film. It is extremely effective in removing hydrophilic substances. 4) It is possible to recover a reusable substance from the drain discharged from the device according to the present invention. If an appropriate device is added, useful substances can be recovered.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of an enthalpy exchange device of the present invention.

FIG. 2 is a schematic explanatory view showing another embodiment.

FIG. 3 is a perspective view of a cross-flow heat exchanger used in the device of the present invention.

FIG. 4 is an enthalpy diagram.

FIG. 5 is an explanatory diagram of a conventional device.

[Explanation of symbols]

 1 Cross-flow heat exchanger 2 High temperature side air inlet (outside air) 3 Low temperature side air inlet (return air) 4 High temperature side air outlet (air supply) 5 Low temperature side air outlet (exhaust) 6 Water supply control valve 7 Water spray nozzle 8 Drain pan 9 Water seal device 10 Drainage port 11 Humidifier

Claims (5)

[Claims] 1. A cross-flow heat exchanger, a water spray device installed on the hot gas inlet side of the cross-flow heat exchanger, and a hot gas outlet side installed on the cross-flow heat exchanger. From a drain treatment device, a water spray device installed on the low temperature side gas inlet side of the cross flow type heat exchanger, and a drain treatment device installed on the low temperature side gas outlet side of the cross flow type heat exchanger, An enthalpy exchange device characterized by being configured. 2. A crossflow heat exchanger, a humidifier installed on the high temperature gas inlet side of the crossflow heat exchanger, and a humidifier installed on the low temperature gas inlet side of the crossflow heat exchanger. An enthalpy exchange device comprising: a water spray device; and a drain treatment device installed on the low temperature gas outlet side of the cross-flow heat exchanger. 3. The enthalpy exchange apparatus according to claim 1, wherein the surface of the heat transfer element filled in the crossflow heat exchanger is coated with a hydrophilic substance. 4. The enthalpy exchange device according to claim 3, wherein the hydrophilic substance is silica gel. 5. The enthalpy exchange apparatus according to claim 3, wherein the hydrophilic substance is zeolite.