WO2020000133A1

WO2020000133A1 - Mobile air conditioner

Info

Publication number: WO2020000133A1
Application number: PCT/CN2018/092623
Authority: WO
Inventors: Wing Hong Chan
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-06-25
Filing date: 2018-06-25
Publication date: 2020-01-02
Anticipated expiration: 2020-12-25

Abstract

An mobile air conditioner is provided in this disclosure, which comprises an evaporative cooling unit for humidifying and cooling room air; a refrigeration ice-cooling unit for further cooling the room air by heat exchange with water/ice mixture; and an adjusting unit for adjusting a ratio of the room air output from the evaporative cooling unit and cooled air output from the refrigeration ice-cooling unit. The mobile air conditioner combines and integrates the action of evaporative cooling followed by refrigeration to produce ice for further cooling of the air. The use of ice as a cooling media facilitates the mobility of the unit and allow a low power heat-pump refrigeration unit to be used. The control of output temperature of air is realized by adjusting a ratio of evaporative cooled air and ice-cooled air.

Description

MOBILE AIR CONDITIONER

FIELD OF THE INVENTION

The present invention relates to the field of air conditioners, and more particularly to a mobile air conditioner.

BACKGROUND OF THE INVENTION

In the world, particularly in tropical and subtropical countries, a lot of energy is consumed by cooling to produce a comfortable environment for human being. By careful analysis of the energy consumption for cooling, it reveals most of the energy is spent on cooling of the building walls, ceilings, furniture and electrical appliance inside the environment to be cooled. The actual cooling power required to cool the heat generated by human body is very small. This situation often occurs as the cooled air outlet from air-conditioner is usually located far away from the human working space, causing a large amount of cooled air being warmed up by the building structures before it reaches the human being. Hence, an effective way of saving a large amount of energy is to locate the cool air output port close to the human activity space.

Cooling of air by water evaporation is a much more efficient means of cooling compare with the conventional heat pump method of cooling. Unfortunately, the effectiveness of this method of cooling relies on the humidity of the air to be cooled. The lowest temperature of air cooled by evaporation cooling is the “wet-bulb” temperature of the air. Often in high humidity countries, the air can only be cooled by 2 to 3 degree Centigrade. Such small reduction in air temperature cannot be sensed by human beings and hence its effectiveness is always in question. However, regarding energy saving, even a drop of 2 to 3 degree Centigrade often represents 10 to 20 percent saving in total energy required to cool the air to an acceptable level of comfortable temperature. Consequently, evaporation cooling should be utilized with provisions to overcome its shortcomings.

Air temperature of around 24 to 26 degree Centigrade produces a comfortable environment for human carrying out low to gentle physical activities. Lower temperature causes higher heat transfer from objects (including human being) within the cooling space to the cool air and hence more energy is consumed in cooling. Consequently, means of control the output air temperature is necessary to achieve energy saving.

To conclude, it is the objective of this invention to achieve energy economy in cooling for human being through a combination of (i) directing the cooling air to the target space to be cooled at minimum distance; (ii) effective use of water evaporative cooling; and (iii) avoid excessively low outlet air temperature from the cooling device.

Conventional air conditioners are installed on a fixed location and cannot be moved around. It cools the whole space and hence a lot of energy is wasted in the cooling of walls, ceiling and furniture in the room. In the market, there are a few low-power (less than 2kw) mobile air conditioners that can be moved close to the target space and delivery cool air there, but they carry large and long flexible exhaust ducts in order to vent the hot air from the air conditioning condenser into outer space.

Using the latent heat of ice as a means of cooling air can be found as early or even earlier in the 1950’s. US patent 2,802,347 shows an automobile air cooling device using this principle, but it was not integrated with a refrigeration (ice-making) system. US patent 3,653,221 shows a large, permanently installed latent storage air conditioning system with refrigeration to produce ice for cooling. These various inventions patented to use ice to cool the air, were aimed either for mobility of the cooling unit or for storage of cooling energy for electrical power-off situation. For smaller units, ice was produced in other refrigeration devices, and then loaded into the cooler for the cooling operation. A few ice-cooling systems were designed with integrated refrigeration systems to produce the ice for cooling, but they were large stationary air-conditioning systems mainly aimed to use the latent heat of ice for cooling when the main air conditioner was power off.

Cooling of air and fluid by water evaporation had also been adopted long time ago. US patent 3,362,186 invented a cooling device for fluids using evaporation of water. US patent 4,968,457 reveals a non-circulating water system for evaporative coolers. US patent 9,903,603 B2 on air cooling system for a building structure using evaporation cooling. Nowadays, there are small and large cool air systems with evaporative cooling in the market, ranging from portable cooling fans to wall or ceiling mounted units for cooling of buildings. In some of the mobile water evaporation cooling units in the market, a small ice-holding bin is installed. These bins locate in the path of output air flow, helping to reduce slightly the output air temperature. The bin usually holds a small piece of ice produced by another refrigerator, and its cooling effect is rather short as the small piece of ice melt away quickly.

Base on the methods mentioned previously, there is no invention that relates to a highly mobile air-conditioning unit combining conventional heat-pump refrigeration with water evaporative cooling, together with means of adjusting output air temperature.

There is no publication or product in the market that is invented based on the same principle of operation describe in this invention.

SUMMARY OF THE INVENTION

For the short comings of the prior arts, an object of the present invention is to provide a mobile air conditioner which attempts to deliver cool air around the area where the recipients are, so that most of the cooling energy spends on them. For example, in sleeping, only a cool space is required around the sleeping bed, and if this can be achieved, only a fraction of the energy is required to cool the whole bedroom. To achieve this aim, the air conditioner should be mobile such that it can be moved to a location where cool air outlet is closed to space that requires to be cooled. Consequently, a mobile air conditioner is invented with a low power conventional refrigeration system to produce ice, in which the latent heat that it absorbs is used to cool the incoming air without the need of operating the heat pump refrigeration unit at the same time. In fact, this invention does not limit the use of ice as the latent heat storage media. If for some reason, water and ice can be replaced by another chemical, or with chemical additives to the water, which can be used as long as it serves the purpose of absorbing and releasing the latent heat energy for the operation of this invention. However, for convenience, in this document, water and ice are addressed as the media to serves this purpose.

As it is expected that the air-conditioner will be used to deliver cool air eight to ten hours a day, the rest of the time when cool air is not required can be operated in ice-making mode, hence a low-power refrigerator unit can be used to produce ice when cool air is not required. With this arrangement, the heat pump refrigeration unit can be turned off and the need of providing a venting pipe, for removing the hot air produce in cooling of the air-conditioning condenser, is not required. The unit can then be located to any area without much limitation.

Further saving can be achieved by evaporative cooling of the incoming air before cooling by the ice/water mixture of the unit. By directing the air through a patch of fabric or similar water absorbing material wetted by a bath of water, evaporative cooling can be carried out. Also, the cold water condensate from the ice/water to air heat exchanger will be drained into this bath, helping to improve the effectiveness of evaporative cooling. Evaporative cooling saves a lot of cooling energy when the air humidity is low.

A final aim of this disclosure is to improve energy saving to avoid over-cooling of the output air. Over-cooled air absorbs more heat from surrounding than air of suitable coolness. In this disclosure, the control the temperature of the outgoing cool air is carried out in the following manner. A certain percentage of air passing through the evaporative cooling unit is set to bypasses the ice cooling unit. This quantity of air is then mixed with the cool air that produced by ice cooling before going through the air outlet of the air conditioner. By controlling the mixing air quantities of these two types of air, the desired temperature for comfortable cooling can be achieved. The control of air mixture ratio can be done manually or automatically. In certain instance, it is also possible to mix room air with the air mixtures from this air conditioner mentioned above to increase air flow.

The technical solutions of the present invention are as follows:

In this disclosure, an air conditioner is provided, which comprises: an evaporative cooling unit for humidifying and cooling room air; a refrigeration ice-cooling unit for further cooling the room air by heat exchange with water/ice mixture; and an adjusting unit for adjusting a quantity ratio of evaporative cooled air output from the evaporative cooling unit and ice-cooled air output from the refrigeration ice-cooling unit.

Advantageously, the evaporative cooling unit comprises: a bin filled with water at a suitable level; a water absorption media hung with a lower portion immersed in a bath of the water and a top portion kept at a short distance above the water surface in the bin; and a centrifugal blower to draw the room air and feed into an inlet of an air channel in the bin, allowing the room air to flow through an air space above the water surface in the bin and air gaps formed by the water absorption media.

Advantageously, the evaporative cooling unit can be designed in other forms, which have been commonly adopted by some evaporative coolers in the market. This includes blowing air, usually by an axle fan, through a flat grid or mesh having small air passages channel across its thickness. This flat grid is usually mounted with its large face in a vertical position and placed over a water tank. A small water pump delivers the water from the tank to the top edge of the flat grid, and the water flows down the grid and wets the surfaces of the air passage channel of the grid. In this way, when air blow through this grid, it is humidified and cooled by the latent heat absorbed in water evaporation.

Advantageously, other designs of evaporative cooling are possible, such as humidifying the air by water-mist spray, or by centrifugal atomization of water, or by ultrasonic vibration to generate water mist. As all of these ways in humidifying air to generate evaporative cooling effect are well established techniques, hence they are not mentioned here in this document.

In this document, the principle of this invention involves the use of the latent heat of solidification of a material which absorbs and release heat energy in the change of physical phase. However, in common practice, water is used as the media for this purpose, and hence, refrigeration cooling in this document is referred to as ice-cooling or ice-water cooling.

Advantageously, the refrigeration ice-cooling unit comprises: a compressor; a condenser; and an evaporator immersed in a bath of water held by a container for cooling surrounding water and eventually creating ice blocks in the container.

Advantageously, in one design, the bottom portion of the container is constructed with a built-in or fitted-in air channel communicating with an outlet of the air channel of the evaporative cooling unit.

Advantageously, in another design, the water inside the ice/water mixture container is pumped to a fin-type heat exchanger and a portion of the air from the evaporative cooling unit is directed through this heat exchanger, allowing the air to be cooled further.

Advantageously, a drainage provision is provided on this ice-cooling air channel or heat exchanger to collect the water condensed in ice-cooling and then guide it into the water bin of the evaporative cooling unit.

Advantageously, the outlet air temperature adjusting unit essentially controls the proportion of mixture of evaporative cooled air and ice/water cooled air to achieve the required air outlet temperature. The device comprises of an air passage valve plate which increases or decreases the effective flow cross-sectional areas of the air channel for evaporative cooled air and that for ice/water cooled air.

Advantageously, a temperature measuring and indicating device is installed at the outlet air channel to aid the adjustment of the temperature of the outlet air from this mobile air-conditioner.

Advantageously, a heat insulating layer is arranged to embed the ice/water container and its associated air channels for minimizing heat transfer from the surrounding to the cooling media and cooled air.

Advantageously, an air outlet window is provided to guide the air flow directly into the destination space that requires cooling.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 shows a block diagram illustrating an overall operative concept of the mobile air conditioner in this invention;

Fig. 2 shows an overall schematic arrangement of key elements in a mobile air conditioner in this invention;

Fig. 3 shows a schematic view of a refrigeration ice-cooling unit of the mobile air conditioner in Fig. 2;

Fig. 4 shows a schematic view of air channels and directions of air flow thereof in the mobile air conditioner in Fig. 2; the solid arrows in Fig. 4 show the approximate direction of air flow;

Fig. 5 shows a schematic view of the setting of lower output air temperature with a flapper valve in the mobile air conditioner in Fig. 2;

Fig. 6 shows a schematic view of the setting of higher output air temperature with the flapper valve in the mobile air conditioner Fig. 2;

Fig. 7 shows an overall schematic arrangement of key elements in an alternative design of a mobile air conditioner in this invention; and

Fig. 8 shows a schematic view of air channels and directions of air flow thereof in the mobile air conditioner in Fig. 7; the solid arrows in Fig. 8 show the approximate direction of air flow.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present invention will now be more particularly described, by way of example only, with reference to the accompanying drawings. It should be understood that the drawing are for better understanding and should not limit the present invention. Dimensions of components and features shown in the drawings are generally chosen for convenience and clarity of presentation and are not necessarily shown to scale.

This disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Like reference numerals refer to like elements throughout. As used in the description herein and throughout the claims that follow, the meaning of “a, ” “an, ” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein and throughout the claims that follow, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.

The operative concept of this mobile air conditioner is illustrated in FIG. 1. Room air at a temperature of T _R is drawn in to the air intake of this mobile air conditioner; it is then cooled by the heat absorbs in evaporation of water with air temperature down to the wet bulb temperature of the in-coming room air, and relative humidity raised to 100%at the cooled air temperature. A portion of the air from the outlet of the evaporative cooling unit is then guided into an ice-cooling heat exchange air channel, where the temperature of the air is further reduced and exit at an air temperature of T _I and relative humidity of 100%at T _I. Condensate of this ice-cooled air is drained into the water tank of the evaporative cooling unit. The remaining portion of air from the outlet of the evaporative cooling unit is guided to an air mixing channel, inside which the air is then mixed with the air from the ice-cooling unit. Depending in the mixing ratio, the temperature of the air at the exit of this mixing channel becomes T _M, which is warmer than the ice-cooled air and cooler than the evaporative cooled air. The relative humidity of this mixed air depends on the air mixing ratio, but it would most likely be slightly less than 100%at T _M, and hence no condensate is expected. Finally, the air from the outlet of the mobile air conditioner flows through a window into the space that desired to be cooled. Cool air from the mobile air conditioner is then diffuse with the air in that space and the resulting air temperature will be slightly increased, and the relative humidity will be reduced.

The major structure in this invention is a mobile air conditioner shown in FIG. 2. As shown in FIG. 2, the mobile air conditioner comprises an evaporative cooling unit for humidifying and cooling room air, a refrigeration ice-cooling unit for further cooling the room air by heat exchange with water/ice mixture, and an adjusting unit for adjusting the amount of evaporative cooled air output from the evaporative cooling unit that goes into the refrigeration ice-cooling unit, and the amount of evaporative cooled air output from the evaporative cooling unit that by-passes the refrigeration ice-cooling unit. These units will be integrated and fitted to the same housing of the mobile air conditioner, allowing it to be moved to a location where the outlet cool air can be closely delivered into the destination space.

As shown in FIG. 2 to FIG. 4, the evaporative cooling unit comprises: a bin 2 filled with water 7 at a suitable level, a water absorption media 3 hung with a lower portion immersed in a bath of the water 7 and a top portion kept at a short distance above the water surface in the bin 2, and a centrifugal blower 21 to draw the room air and feed into an inlet of a first air channel 24 in the bin 2, allowing the room air to flow through an air space 25 above the water surface in the bin 2 and air gaps formed by the water absorption media 3. It should be understood that the water absorption media 3 may be strips of fabric, patches of sponge, or other material with fine capillary structure and wetting property. When the air flows through the space 25, air is humidified, causing heat of the air to be absorbed by the latent heat of water evaporation. The temperature of the air at the outlet of the first air channel 24 is thus reduced. Configuration of this evaporative cooling unit can be different from the one described above. For example, the evaporation pad can be a fibrous mesh with porous body and mounted with its larger surface faces in a vertical position, and water is applied to the top edge of the pad by a small recirculating water pump to saturate the fibrous mesh by the water flowing down its surfaces. Air is then blown through the larger surface of the fibrous mesh to initiate evaporative cooling action. Irrespective of the different configurations of the evaporative cooling, the application of this principal to this invention is still valid.

As shown in FIG. 2 and FIG. 3, the refrigeration ice-cooling unit comprises: a compressor 10, a condenser 11, and an evaporator 12 immersed in a bath of water 6 held by a container 1 so that heat is transferred from the water 6 into the evaporator coil, and the surrounding water is cooled and eventually forming ice blocks in the container 1. It should be understood that the refrigeration ice-cooling unit may further comprises other small refrigeration accessories not shown in the drawings. A bottom portion of the container is defined with a second air channel 27 communicating with an outlet of the first air channel 24. In some embodiments, the second air channel 27 is a built in or fitted in channel of the container 1 to allow continuous flow of air. Air from the outlet of the first air channel 24 is fed into the inlet of the second air channel 27 of the ice/water container 1. When the air flow through the air channel 27, heat is transferred from the air to the ice/water mixture 6 through the walls of the air channel 27 built or fitted on the container 1. Depending on the temperature of the air after passing through the evaporative cooling unit, it is expected that the air temperature will be lowered by about 10 to 16 degree Centigrade in the course of flowing through the air channel 27.

In some embodiments, a hole 5 is defined on the second air channel 27 for water drainage from the second air channel 27 into the bin 2. The water condensate of the air cooled in air channel 27 is drain through water drainage hole 5 into the water bin 2 of the evaporative cooling unit.

As shown in FIG. 2 and FIG. 4 to FIG. 6, the adjusting unit comprises: a third air channel 23 communicating with the outlet of the first air channel 24, and a flapper valve 8 for adjusting an inlet area of the third air channel 23. The adjusting unit is used for setting the temperature of the outlet air of the mobile air conditioner. One of the essential features of this mobile air conditioner is that the output cool air is not designed to flow at high velocity. It is intended that the flow of output air from the device formed into an air blanket which gently embraced the space to be cooled. This gentle flow of air avoids turbulent mixing of the hotter air, which reduces the cooling effect of the device. Also, the temperature of the air is not set to a low value to avoid energy wastage due to higher rate of heat absorbed by the cool air from the surroundings. To achieve the setting and control of temperature of the output air from the mobile air conditioner, a portion of the air drawn in by the centrifugal blower 21 is guided into channel 24 and goes out through a third air channel 23, thus bypassing the ice cooling unit. In some embodiments, a fifth air channel 30 communicating with the third air channels 23 and a fourth air channel 26 is arranged for mixing ice-cooled air output from the fourth air channel 26 and evaporative cooled air output from the third air channel 23. Thus, this volume of air is then mixed in air channel 30 with the ice-cooled air coming out of the air channel 26 communicating with the air channel 27. As the ice/water 6 in the container 1 is almost constant at zero degree Centigrade during the effective operation period of this mobile air conditioner, consequently, with a relatively constant flow of air through both cooling units, for a particular temperature and relative humidity of the room air, it is expected that the temperature of the air at the outlet of the air channel 26 to be rather stable. Hence, by adjusting the amount of air from the evaporative cooling unit mixing with the ice-cooled air at the air mixing channel 30, the desired temperature can be achieved. In certain instance, the volume of air flow can be increased by installing a small axle fan drawing room air into the air mixing channel. In this instance, the output air from this air conditioner become a mixture of evaporative cooled air, ice-cooled air, and room air as illustration by the block diagram in Fig. 1.

There are several methods of adjusting the ratio of evaporative cooled air and ice-cooled air, either manually or automatically. The diagram in this disclosure illustrates a simple way of setting this ratio manually. Other methods in achieving the setting of outlet temperature by using this principle of air mixing are within the scope of the claims. FIG. 5 and FIG. 6 show a flapper valve 8, which can be turned about a turning axis and then kept in a set position by turning friction or by spring loaded indexing over a circular array of detention notches. In turning the flapper valve 8, it increases or reduces the effective inlet area of the air channel 23, resulting in controlling the volume of air from the evaporative cooling unit going into an inlet of the air channel 23. FIG. 4 shows the flapper valve 8 being set to reduce the amount of air going into air channel 23, which in turn reduces the evaporative cooled air to ice-cooled air ratio. Hence, the outlet temperature of the air from this mobile air conditioner is lowered. In FIG. 5, the flapper valve 8 is set to allow more warm air going into the air channel 23, and going out at an outlet of the air channel 23 and then mixed with ice-cooled air in the channel 30, thus increasing the outgoing air temperature. The air at an outlet 31 of this mobile air conditioner is sensed by a temperature sensor and display 22 installed in the control panel of the mobile air conditioner.

As shown in FIG. 2, in some embodiments, heat insulating layer 4 is arranged on the unit for heat insulating the container 1 and air channels to their surrounding warmer environment.

Fig. 7 illustrates another embodiment of this invention that is within the same principle of operation of this mobile air conditioner. As shown in Fig. 7, the mobile air conditioner comprises an evaporative cooling unit for humidifying and cooling room air, a refrigeration ice-cooling unit for further cooling the room air by heat exchange with water/ice mixture, and an adjusting unit for adjusting a ratio of evaporative cooled air output from the evaporative cooling unit and ice-cooled air output from the refrigeration ice-cooling unit. These units are also integrated and fitted to the same housing of the mobile air-conditioner and allowing it to be moved to a location where the outlet cool air can be delivered into the destination space.

As shown in Fig. 7, the evaporative cooling unit comprises: a bin 42 filled with water 47 at a suitable level, the water is then pump by a small pump 49 to the top edge of a grid plate 43, and a fan 61 which blows room air into the evaporative cooling unit. The grid plate 43 comprises of a porous structure with many miniature air passage channels through its thickness. When water flow down this grid plate 43, the air passages are wet by water, which evaporate into the air that passes through the air passage channels of the grid plate 43, and the air is humidified and cooled.

The air coming out of the evaporative cooling unit is then guided into a duct 66. At the exit of duct 66, there is a flapper plate valve 63, guiding the air into two

air channels

67 and 70. Air channel 67 guides the air into the refrigeration cooling unit, and air channel 70 guides the air by-passing the refrigeration cooling unit.

Fig. 7 also shows the major components of the refrigeration unit, which comprises: a refrigerant compressor 50, a refrigerant condenser 51, and a refrigerant evaporator 52 which is immersed in a tank of water 46 in a container 41. When the refrigerant compressor 50 is switched on, water 46 is cooled down to freezing temperature and ice begins to form around the evaporator coil 52. With a sufficient amount of ice formed in the container 41, the refrigeration cooling unit can be put into operation. The icy cold water in container 41 is pump by a water pump 48 into a water-air heat exchanger 45, which has many metal fins for better heat transfer efficiency. Air inside air channel 67 are then driven through the heat exchanger 45 by fan 62, which may not be needed if the air flow inside air channel 67 is strong enough. Air exiting from air channel 67 is then flow through the water-air heat exchanger 45, and cool down to a reasonably low temperature. Air at the exit 68 of the refrigeration cooling unit and then guided to exist 69 and flow into air channel 72 where the cold air from the refrigeration unit meets the humidified air from the evaporative cooler coming out from air channel 71 into air channel 72 and mixes over there. The flapper plate 63 can be turned to a suitable position to vary the effective cross-sectional areas of the air channel inlet 67 and air channel inlet 70. This would change the amount of air going through the refrigeration cooling unit and the amount of air by-passing the refrigeration cooling unit, and finally resulting the required outlet air temperature at this mobile air conditioner outlet 73.

Fig. 8 illustrates the directions of air flow in this mobile air conditioner.

Although the invention is described with reference to one or more preferred embodiments, it should be appreciated by those skilled in the art that various modifications are possible. Therefore, the scope of the invention is to be determined by reference to the claims that follow.

Claims

An air conditioner, comprising:

an evaporative cooling unit for humidifying and cooling air;

a refrigeration cooling unit for cooling a chemical to a temperature that allows the solid physical state of the liquid to be formed; and

an outlet air temperature adjusting unit.
The air conditioner of claim 1, wherein the evaporative cooling unit comprises:

a bin filled with water at a suitable level;

a provision that evaporate the water in the bin and humidifies the air; and

a blower or fan to draw the air outside the air conditioner and feed into an inlet of an air channel of the air conditioner, guiding the air to flow through the evaporative cooling unit.
The air conditioner of claim 2, wherein the provision for evaporating water in the evaporative cooling unit comprises a wetting media that allow air to pass through air channels in its porous body, and the air channels formed by its installation shape; the air channels in this wetting media are wetted by water in order to humidify the air passing through.
The air conditioner of claim 3, wherein the water that wets the water wetting media is either absorbed by the capillary action of the material of the water wetting media, and/or by a water pump spreading or spraying water on the water wetting media.
The air conditioner of claim 1, wherein the refrigeration cooling unit comprises:

a compressor;

a condenser; and

a refrigeration cooling device including a refrigeration evaporator immersed in a bath of liquid in a container, for removing heat from the surrounding liquid and eventually transforming the liquid to its physical solid phase in the container.
The air conditioner of claim 5, wherein the bath of liquid is water, which will be formed into ice-water mixture by the refrigeration cooling device.
The air conditioner of claim 6, wherein the ice-water mixture is used for cooling the air, by either passing the air through an air channel that is built-in or fitted-in to the container, or by pumping the cold water to a water-air heat exchanger for cooling the air.
The air conditioner of claim 7, wherein the outlet air temperature adjusting unit accomplishes temperature adjustment by mixing an appropriate flow volume of air cooled by the refrigeration cooling device, and the flow volume of air cooled by the evaporative cooling unit.
The air conditioner of claim 1, wherein the outlet air temperature adjusting unit comprises:

an air flow channel, installed at the outlet of the evaporator cooling unit, that bypass the refrigeration cooling unit,

an air flow channel installed at the outlet of the refrigeration cooling unit,

a provision of adjusting the ratio of flow volume of air cooled by the refrigeration cooling unit and the flow volume of air cooled by the evaporative cooling unit, and

an air channel where the air cooled by the refrigeration cooling unit and the air cooled by the evaporative cooling unit can be mixed.
The air conditioner of claim 2, wherein the provision is configured to adjust the ratio of flow volume of air cooled by the refrigeration cooling unit and the flow volume of air cooled by the evaporative cooling unit, and comprises a flapper plate that can be adjusted in position such that the effective cross-sectional area of air channels for the air leaving the refrigeration cooling unit and the effective cross-sectional area of the air channel for the air leaving the evaporative cooling unit that by-passing the refrigeration cooling unit.
The air conditioner of claim 8, further comprising a temperature indicator showing the temperature of the air coming out of the air conditioner so as to aid the adjustment of temperature.
The air conditioner of claim 5, wherein a heat insulation material is installed to cover the container, and the channels of cooled air, to minimize the heat transfer from warm environment or from the heat generated by the warmer refrigeration elements of the air conditioner.