JPH0579662A - Direct contact type air cooling device - Google Patents

Abstract

PURPOSE:To promote the cooling of indoor air and regulate the humidity of the same by a method wherein cold water is obtained by operating a refrigerating machine by night electric power and the indoor air is conducted against the cold water as a counter flow in a heat exchanger, accommodating filler, to contact them directly. CONSTITUTION:In a heat exchanger 13, indoor air is conducted by a fan 14 so as to form ascending stream (g) while cold water is conducted from a heat accumulating tank 6 by a circulating pump 7 so as to form descending stream (s). On the other hand, cold water in a cold water supplying pipe 15 is mixed with the cold water, whose heat is exchanged, from the bottom of an air cooler 11 through a cold water returning passage 17 to regulate the temperature of the cold water whereby the humidity of the indoor air is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct contact type air cooling device in a heat storage type cooling device.

[0002]

2. Description of the Related Art In a conventional heat storage type cooling device, the cooling device is operated by using inexpensive nighttime electric power, cold heat is stored in a heat storage tank as cold water or ice, and the cold water is taken out in the daytime for cooling. To use.

In this case, air is cooled by indirect heat exchange between cold water and room air.
For example, a fan-coil type air cooling device in which cold water is caused to flow in a coiled tube and air is caused to flow on the surface of the coiled tube by an indoor air fan to cool it is widely used.

[0004]

In the prior art using the fan-coil type air cooling device, the heat transfer on the side where the air flows in the coil is significantly worse than that on the side where the water flows. Although fins and the like are attached to increase the heat transfer area and to promote heat transfer, the air cooling device becomes expensive. Further, for the same reason, it is necessary to increase the flow velocity of air, but this increases the power for driving the fan, which causes an increase in running cost.

If the heat storage tank is of the ice type, the temperature of the cold water taken out from the heat storage tank is close to 0 ° C., so the temperature of the air blown out is lowered to reduce the fan power. Since it is exchange, there is a limit to the decrease in the blowout temperature.

Further, in an air conditioner, it is important to adjust not only the air temperature but also the air humidity, but since it is an indirect heat exchange, it is not possible to sufficiently control the air humidity only with a cooling coil.

[0007]

In order to solve the above problems, a direct contact type air cooling device of the present invention has a refrigerator unit, a heat storage tank, a direct contact type air cooler, and a room air fan. , The evaporator of the refrigerator unit is installed in the heat storage tank, has a cold water supply pipe and a cold water return pipe for circulating cold water between the heat storage tank and the air cooler, and in the air cooler It has a heat exchanger having a filler and a cold water atomizer (the invention of claim 1).

Further, the direct contact type air cooling device of the present invention comprises:
In order to solve the above-mentioned problems, in the invention of claim 1, a large number of fillers are filled in the heat exchanger, and indoor air rises upward from below in a large number of gaps formed by the group of the fillers. And the cold water flowing in from the cold water supply pipe becomes a downward flow from the upper part to the lower part of the gap,
An indoor air fan and a cold water sprayer are respectively provided for the air cooler so that the upflow and the downflow are opposite flows, and the cold water from the air cooler is circulated through a cold water supply pipe having a circulation pump. A cold water return side passage is provided for flowing into the suction side of the pump (the invention of claim 2).

The heat exchanger may be a module which is removably filled with a filler and has an inlet and an outlet for cold water and an inlet and an outlet for indoor air.

[0010]

[Operation] The nighttime electric power is used to operate the refrigerator to store cold heat in the heat storage tank to obtain cold water. The indoor air and the cold water cooled in the refrigerator and stored in the heat storage tank are circulated so that a counterflow is formed with respect to the filler filled in the heat exchanger in the air cooler, and the indoor air and the cold water are By directly contacting with each other, cold heat is efficiently transferred from cold water to room air.

The temperature of the cold water supplied to the air cooler is introduced by introducing the cold water, which has accumulated in the lower part of the air cooler after the heat exchange with the room air and the temperature of which has risen, to the suction side of the circulation pump of the cold water supply pipe. Is adjusted, and as a result, the humidity of the air is adjusted.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. A outdoor heat source unit includes a refrigerator unit including a compressor 1, an air-cooling condenser 2, a liquid receiver 3, an expansion valve 4 and the like, a heat storage water tank 6 containing an evaporator 5, a circulation pump 7 and the like. B is an indoor unit, a cold water sprayer 12, a heat exchanger
An air cooler 11 having a built-in 13 and an indoor air fan 14 are included. The heat storage water tank 6 and the air cooler 11 are cold water supply pipes.
15, a chilled water return pipe 16 and a chilled water return side passage 17 are connected, and a chilled water return side passage 17 has a three-way switching valve 8 at the suction side of the circulation pump 7 connected to the chilled water supply pipe 15. There is.

The refrigerant compressed by the compressor 1 is condensed and liquefied by the air-cooled condenser 2 and introduced into the evaporator 5 through the liquid receiver 3 and the expansion valve 4, where it is evaporated and the water in the heat storage water tank 6 is cooled. If the refrigerator unit is operated by using inexpensive nighttime electric power, cold heat can be stored in the heat storage water tank 6.

Indoor cooling is performed as follows. The circulation pump 7 sprays the cold water in the heat storage water tank 6 through the cold water supply pipe 15 from the cold water sprayer 12 in the air cooler 11 onto the entire upper surface of the heat exchanger 13. The heat exchanger 13 is filled with a large number of fillers as shown in FIG. 3, and the entire surface of the filler is wet with cold water by the cold water spraying. The cold water that has flowed down as a downward flow in the heat exchanger 13 in the S direction is collected at the bottom of the air cooler 11 and returns to the heat storage water tank 6 via the cold water return pipe 16.

The indoor air is introduced from the P direction below the air cooler 11 by the indoor air fan 14 and flows upward in the q direction from the lower direction to the upper direction to flow in the heat exchanger 13. Therefore, the air is in direct contact with the cold water, and the flow direction is opposite to the downward flow of the cold water, and the air flows in the opposite direction.
The heat transfer between the cold water and the air increases, and the temperature difference between the inlet and the outlet of the cold water and the air increases. That is, in the case of the indirect contact type of the prior art, cold water becomes 4 ° C. → 12 ° C. and air becomes 24 ° C. → 16 ° C., whereas according to the direct contact type of the present embodiment, cold water becomes 4 ° C. → 18 ° C. 24 ° C → 1
The temperature becomes 0 ° C., which means that the air can be cooled to a lower temperature than the conventional technique. The cooled air again flows into the room from the r direction and circulates.

As described above, since the cold water and the air are in counterflow and are in direct contact with each other, the air is dehumidified to the saturated water vapor amount corresponding to the cold water temperature. Therefore, the air is cooled and dehumidified. Therefore, the humidity of the indoor air can be easily adjusted by changing the cold water temperature and the air flow rate. For example, when adjusting the humidity of the air, as a result of heat exchange, the temperature rises and a part of the cold water accumulated at the bottom of the air cooler 11 is circulated through the cold water return side passage 17 by switching the three-way switching valve 8. An air cooler is introduced into the suction side of the pump 7 and mixed with cold water flowing out from the heat storage water tank 6 to obtain appropriately adjusted cold water via a cold water supply pipe 15.
Inflow to 11. As a result, the amount of saturated steam corresponding to the temperature of the adjusted cold water is dehumidified, so that the humidity can be adjusted.

A second embodiment of the present invention will be described with reference to FIG. C is a refrigerator unit, 9 is a water-cooled condenser, 10 is a prime mover for driving the compressor 1, 18 is an ice bank type heat storage tank, 21 is a direct contact type air cooler, 22 is an indoor air fan, and 23 is The air outflow pipe, 24 is a heat exchanger with a built-in filler. This embodiment relates to an ice heat storage type air cooling device, and the portions denoted by the same reference numerals as those in FIG.

The cold water of 0 ° C. in the ice bank type heat storage tank 18 is circulated by the circulation pump 7 through the cold water supply pipe 15 and the air cooler.
After being introduced into 21 and flowing through the heat exchanger 24 as a downward flow, it is returned to the inside of the ice bank type heat storage tank 18 through the cold water return pipe 16 and repeated circulation. On the other hand, the indoor air is introduced into the air cooler 21 by the indoor air fan 22 and rises in the heat exchanger 24 to form a counterflow with the cold water to directly exchange heat with the cold water and then return to the room from the air outflow pipe 23. , Repeat the circulation. The refrigerator cycle is exactly the same as in FIG.

In any of the embodiments shown in FIGS. 1 and 2, the shape, structure and arrangement of the fillers filled in the heat exchangers 13 and 24 are such that the cold water and the air flowing in the counterflow form. It greatly affects the degree of heat exchange between them. FIG. 3 shows specific examples of various shapes and structures of the filler.
a is a Raschig ring, b is an interlocks saddle, c is terra red, and d is a pole ring. All of these packing materials are used in distillation towers of chemical plants, etc., and have a large packing density (mass per unit volume) and specific surface area (surface area per unit volume), and contact between air and cold water. Since the surface area is large, the heat transfer coefficient is improved. The characteristics of the filler are shown in Table 1.

[0020]

[Table 1]

As a result, direct contact between air and cold water is promoted without increasing the fan power, and the cost and space of the device can be reduced. Since the filling material can be freely attached and detached in the module, the filling material can be replaced as appropriate, and when it becomes dirty, it can be removed and cleaned.

Further, fine dust (dust) contained in the indoor air is collected by the cold water when it comes into direct contact with the cold water, so that it has an effect of cleaning the air. Further, in the embodiment of FIG. 1, it is necessary to provide a filter for air cleaning on the suction side of the indoor air fan 14, but if the fan is of the suction type and is provided on the air outflow side of the upper part of the air cooler 11. The filter can be eliminated by utilizing the cleaning effect. If such a suction type fan is used, it is effective as a cooling device for air containing much dust such as in kitchens and factories.

It should be noted that when spraying cold water to the filler in the above embodiment, it should be noted that water droplets are not entrained in the blown air and that water is evenly distributed in the filler layer. There is a need. For this purpose, it is considered that the cold water sprayer is provided with the following means, for example.
That is, (a) a porous body is used to exude cold water,
(B) Make a hole in the tube and let cold water drop from it.
(C) Spray cold water with a spray nozzle, (D)
The nozzle is swirled using fluid energy to spray cold water (cooling tower method).

An embodiment of the heat exchanger of the present invention will be described with reference to FIGS. 4 and 5. The heat exchanger of the present invention does not indirectly perform heat exchange by using a heat exchange coil (heat transfer tube) or the like as in the prior art, but a large number of fillers are filled and direct contact between air and cold water Since heat is exchanged, there are few restrictions on the shape, and heat exchangers of various shapes can be used. In other words, the heat exchanger can be modularized.

That is, the heat exchangers can be modules 27, 28 and 29 of various shapes as shown in a, b or c of FIG. The arrow in the figure indicates the state in which cold air is blown out. FIG. 5 shows an embodiment in which one heat exchanger is assembled by using two sets of the modules 27 of FIG. 4a. The assembly thus constructed is used as the heat exchanger 13 of the embodiment of FIG. 1 or FIG.
It can be 24. In FIG. 5, s indicates the downflow of cold water, p indicates the direction of the air flow when flowing into the heat exchanger module by the indoor air fan, q indicates the upflow of air, and r indicates the module. It shows the direction of the air flow when it flows out from, and corresponds to p, q, r, and s written in the indoor unit B of FIG. 1, respectively.

The air cooling device of the present invention can add a new value and give an aroma. For example, by mixing an appropriate fragrance into the cold water in the heat storage tank, the cold air blown out from the air cooler 11 can have an aroma.

Further, as is clear from the structure of the indoor unit B of FIG. 1, the air-cooling device of the present invention can be easily constructed by constructing only the piping of cold water, and the module of the heat exchanger in the air-cooling unit 11 is Since it can be installed freely, indoor installation work can be performed at low cost.

[0028]

EFFECTS OF THE INVENTION It is possible to operate a refrigerator using inexpensive nighttime electric power and store a large amount of cold heat in a heat storage tank for use. The indoor air and the cold water cooled in the refrigerator and stored in the heat storage tank are circulated so that a counterflow is formed with respect to the filler filled in the heat exchanger in the air cooler, and the indoor air and the cold water are Are directly contacted with each other, so that cold heat can be efficiently transferred from cold water to indoor air.

Further, since the temperature of the cold water accumulated in the lower part of the air cooler after the heat exchange with the room air is completed, the cold water is appropriately mixed with the cold water supplied to the air cooler. The temperature of the room can be adjusted, and thus the humidity in the room air can be adjusted.

[Brief description of drawings]

FIG. 1 is a flow sheet diagram of a first embodiment of the present invention.

FIG. 2 is a flow sheet diagram of a second embodiment of the present invention.

FIG. 3 is an example of various fillers used in the heat exchanger of the present invention.

4A, 4B, and 4C are three examples when the heat exchanger of the present invention is formed as a module.

FIG. 5 is an embodiment when the module of FIG. 4 is assembled.

[Explanation of symbols]

 5 Evaporator 6 Heat storage water tank as heat storage tank 7 Circulation pump 11 Air cooler 12 Cold water atomizer 13 Heat exchanger 14 Fan for indoor air 15 Cold water supply pipe 16 Cold water return pipe 17 Cold water return side passage 18 Ice bank as heat storage tank Storage tank 21 Air cooler 22 Fan for indoor air 24 Heat exchanger 27, 28, 29 modules

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Teijiro Funazu No. 21-4 Hiramachi 2-chome, Meguro-ku, Tokyo Dorf Metropolitan University No. 905 (72) Inventor Tsutomu Tsukuba 303 Nagata, Ginowan City, Okinawa Prefecture Greenma 2D (72) Inventor Shigeru Sakashita 3-18-10 Takamatsu, Nerima-ku, Tokyo (72) Inventor Hiroshi Sato 1630 Takatani, Ichikawa-shi, Chiba No. 103 Fujimiso 103 (72) Inventor Asahi Yoshikawa Iku 3-15-20, Taeda, Abiko-shi, Chiba Jiune Palace Abiko No. 3-207

Claims (3)

[Claims] 1. A refrigerator unit, a heat storage tank, a direct contact type air cooler, and an indoor air fan, wherein an evaporator of the refrigerator unit is installed in the heat storage tank, and the heat storage tank and the air are installed. A direct contact air cooling device having a cold water supply pipe and a cold water return pipe for circulating cold water to and from a cooler, and having a heat exchanger having a filler in the air cooler and a cold water atomizer. 2. A plurality of fillers are filled in the heat exchanger,
The room air flows upward from below in a large number of gaps formed by the group of fillers, and the cold water flowing from the cold water supply pipe flows downward from above into the gaps, The indoor air fan and the cold water sprayer are respectively provided to the air cooler so that the upward flow and the downward flow of the air flow are opposite flows, and the circulating pump of the cold water supply pipe has a circulating pump for the cold water from the air cooler. 3. The direct contact air cooling device according to claim 1, further comprising a cold water return side passage for allowing the cold water to flow into the suction side. 3. A cold water inflow port, an outflow port, and an indoor air inflow port, in which a filler is removably attached and detached.
3. The direct contact air cooling device according to claim 1, wherein the heat exchanger is formed by a module having an outlet.