JP2002115863A - Multistage-type outside air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contribute to rise of heat efficiency of an outside air conditioner. SOLUTION: Heat efficiency is enhanced by dividing a heat exchanger into three stages or over in series, and using the chiller of an independent system for each so that the outside air conditioner can perform the operation of a compressor at a higher evaporation temperature, the closer it is to the inlet, giving an eye upon the point that the heat exchange of the outside air conditioner is large in temperature width. A direct contact type heat exchanger is used, and for humidification in winter season, the waste heat at low temperature or the warm water of a heat pump at low temperature high in efficiency can be utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an outside air conditioner used for an air conditioner.

[0002]

2. Description of the Related Art Conventional outdoor air conditioners use cold and hot water1.
Either a staged plate fin tube type main heat exchanger or a direct expansion type refrigerant / air heat exchanger is used, and cold / hot water of a chiller or heat pump chiller provided independently for each stage In a direct contact heat exchanger, there was no heat exchanger in which heat was exchanged by directly contacting the air with the outside air, and three or more stages were arranged in series along the flow of the outside air.

[0003]

SUMMARY OF THE INVENTION In order to cool and dehumidify outside air in summer to a dew point below the air dew point in a room where air conditioning is performed, cooling and dehumidification must be performed in a temperature range of 35 ° C. to 10 ° C. From the viewpoint of energy saving, it is necessary to do this, but from the viewpoint of energy saving, one system of chiller operated at a cold water temperature capable of cooling down to 10 ° C, and one system of a direct expansion type operated at an evaporation temperature also capable of cooling down to 10 ° C The use of the refrigeration cycle is wasteful, and this is the first problem.

[0004] The reason is that the heat exchange at a temperature close to the outside air inlet, which is heat-exchanged at a temperature close to the outside air temperature, is sufficient even at a temperature 10 ° C. or more higher than the heat transfer medium used near the outlet. The refrigeration cycle that cools the part near the entrance if divided into two can operate at an evaporating temperature 10 ° C. or more higher than that of a conventional single system, so that the efficiency is 35%.
Although it can be improved, it cannot be realized because the heat exchanger has one stage.

A second problem is that the conventional outside air conditioner uses a plate fin tube type heat exchanger, so that a steam or electric humidifier is used in the humidification period in winter or a high temperature. It is difficult to use low-temperature waste heat or supply heat using a low-temperature high-efficiency heat pump because a high-temperature heat medium is required and a boiler must be prepared, or the heat pump must be operated in a high-temperature range where the efficiency decreases. was.

[0006]

SUMMARY OF THE INVENTION The first problem of the present invention is to provide a separate chiller or heat pump chiller using a multi-stage heat exchanger and an independent system of compressors along the flow of outside air. Cooling and dehumidifying, heating and humidifying,
The second problem has been solved by using a direct contact heat exchanger.

[0007]

[Function] An independent heat exchanger of three or more stages is installed along the flow of outside air, and a systematic independent chiller or heat pump chiller is installed. The first stage chiller naturally evaporates in the middle of summer. The operation is possible at a high temperature, a tepid temperature of 17 ° C., and an evaporating temperature of 11 ° C. even in the second stage, and only the final stage has the same evaporating temperature of about 6 ° C. as the conventional one.

Assuming that the condensation temperature is 45 ° C., this results in a thermodynamically calculated energy saving of 12% in the second stage, 35% energy saving in the third stage, and a total energy saving of 16%.

On the other hand, by using a direct contact heat exchanger, it is possible to naturally humidify with warm water by a low-temperature heat pump operation in winter, and to use a heating medium such as high-temperature steam or hot water or a low-temperature high-temperature medium. No heat pump operation or humidifier using electricity is required.

[0010]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a system diagram of an outside air conditioner according to the present invention, in which 1.2.3.4.5.6.7.8.9 is an outside air intake gallery, an outside air filter, an inlet economizer coil, respectively. 1st, 2nd, and 3rd stage direct contact heat exchangers, outlet economizer coils, reheat coils, and blowers are shown.

The outside air in summer is passed through the gallery 1 and the filter 2 at 35 ° C .;
To 28 ° C. In the first-stage direct contact heat exchanger 4, the first-stage chiller 1 operated at an evaporation temperature of 17 ° C.
The air is cooled and dehumidified to 21 ° C. by heat exchange with 19 ° C. cold water circulated and supplied by the first-stage cold water circulating pump 11.

In the second stage direct contact heat exchanger 5, 11 ° C.
The air is cooled and dehumidified to 15 ° C. by exchanging heat with 13 ° C. cold water circulated and supplied by the second-stage chiller circulation pump 13 from the second-stage chiller 12 operated at the evaporating temperature.
In the direct contact heat exchanger 6 in the third stage, the chiller 14 in the third stage operated at the evaporation temperature of 6 ° C. and the circulating pump 15
Heat exchange with 8 ° C cold water circulated and supplied by 10 ° C
Cooled and dehumidified until.

The air cooled and dehumidified to 10 ° C. is reheated to 17 ° C. by the outlet economizer coil 7 and further reheated by the reheat coil 8 so that the supply of outside air does not affect the room temperature. It is reheated to 20 ° C. close to room temperature using the heat of condensation of the chiller. The heat exchange between the inlet economizer coil 3 and the outlet economizer coil 7 is provided by the heat transfer water circulated between the two by the economizer pump 16.

The direct contact heat exchanger of each stage of 4.5.6 is similar to the heat exchanger used for the packing material of the cross-flow cooling tower, and receives the spray of cold water from the upper spray plate 17. The heat exchange is extremely good because the large surface area becomes wet and heat exchange is performed by direct contact with the air passing therethrough. Cooling and dehumidification with cold water from chillers in the summer, low temperature of about 15 ° C in the winter Heating and humidification with low-temperature water from the heat pump chiller is performed extremely naturally and sufficiently.

The control of the chiller of each stage or the compressor of the heat pump chiller is very simply performed by the circulating water temperature of the stage or the air outlet temperature of the stage, respectively. The dew point temperature of the entire outlet air can be reliably controlled.

[0016]

According to the present invention, as is apparent from the description of the embodiments,
It is operated at each temperature level as the outside air is cooled by a direct contact heat exchanger arranged in series along the flow of the outside air and an independent chiller or heat pump chiller in each stage as well as an independent cold and hot water circulation system. ,
As the evaporating temperature of each refrigeration cycle is also operated at a higher level as it is closer to the entrance, the compression temperature difference of the compressor becomes smaller,
As a result, it is possible to operate at a small compression ratio.
Efficiency is improved as compared with a device cooled by a system cooling device.
Assuming a temperature of ° C., the theoretical thermal efficiency is improved by 16%.

The economizer coil indirectly exchanges heat between the high-temperature inlet air and the low-temperature outlet air cooled and dehumidified in the summer to enable pre-cooling and reheating without the need for a cold or hot heat source. This has the effect of further increasing the thermal efficiency of the outside air conditioner by 13% in the summer and achieving an overall 29% energy saving effect. In addition, the condensing heat of the last stage chiller reduces the supply air temperature to 20 ° C, which is close to room temperature. Reheat reliably by using waste heat.

In the winter season, the operation of a humidifier by electric power, the operation of hot water using fuel such as steam or hot water, the operation of a high-temperature heat pump, and the like are not required, so that an energy saving effect equivalent to that in the summer can be obtained.

Furthermore, since the direct contact heat exchanger has good heat exchange even at a low speed air flow, the air passage resistance is lower than that of an outside air conditioner using a general plate fin tube type heat exchanger. It is extremely low and has the effect of greatly reducing the power of the blower operated throughout the year, and further enhances the energy saving effect.

The control of the compressor of the chiller of each stage is very simply performed by judging whether or not the conditions required for each stage are satisfied by the temperature controller of each stage. A complicated control circuit is not required, and the dew point control of the outlet air can be reliably performed as the whole outside air conditioner.

There is also a by-product effect such that the dew point temperature of the supply air is controlled by controlling the capacity of the subdivided final stage compressor, thereby making it easier to control the humidity of the room where air conditioning is performed. .

[Brief description of the drawings]

FIG. 1 is a system diagram of an outside air conditioner according to the present invention.

[Explanation of symbols]

 1. Open air gallery 2 Filter 3. 3. Inlet economizer coil 4. First stage direct contact heat exchanger Second stage direct contact heat exchanger 6th stage direct contact heat exchanger 7. Exit economizer coil Reheat coil 9. Blower 10. First-stage chiller 11. 11. First-stage chilled water circulation pump Second stage chiller 13. 13. Second-stage chilled water circulation pump 13. Third-tier chiller Third-stage chilled water circulation pump 16. Economizer pump 17. Sprinkler plate

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 500408016 Takashi Yanagimachi 4-12-7 Fujisawa, Fujisawa City, Kanagawa Prefecture (71) Applicant 500408027 Kaneko Tanaka 4-12-7, Fujisawa, Fujisawa City, Kanagawa Prefecture (71) Applicant 500408038 Aya Tanaka 4-12-7 Fujisawa, Fujisawa-shi, Kanagawa (72) Inventor Kiyoshi Yanagimachi 2-2-2, Kugenumaishigami, Fujisawa-shi, Kanagawa 203 F-term (reference) 3L050 BA05 BB04 BB12 BB16 3L053 BC02 BC05

Claims (4)

[Claims] In an outside air conditioner for supplying air to a room for cooling and dehumidifying outside air for air conditioning, a chiller or a heat pump chiller independently installed at each stage is used to directly feed cold water or hot water into a heat exchanger. An outside air conditioner characterized in that three or more stages of devices for directly contacting heat exchange with the outside air in the exchanger are installed in series along the flow of the outside air. 2. The outside air conditioner according to claim 1, wherein the outside air that has been cooled and dehumidified is reheated with waste heat of a condenser of a last-stage chiller. 3. A downstream of the final stage direct contact heat exchanger,
2. The outside air conditioner according to claim 1, wherein heat exchangers for circulating a heat medium such as water with each other are provided upstream of the first-stage direct contact heat exchanger. 4. The outside air conditioner according to claim 1, wherein the control of the chiller compressor of each stage is simply performed at the cold water temperature or the air temperature of the stage.