Regenerative dehumidifying heat exchanger and its production method

A production method and technology of heat exchangers, which are applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems that are not conducive to dehumidification/regeneration of desiccants, reduced operating efficiency, and increased energy consumption, so as to improve indoor air quality , low equipment investment cost, and compact device size

Inactive Publication Date: 2009-06-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, refrigeration dehumidification also has the following disadvantages: (1) limited by the temperature of the cooling medium, cooling and dehumidification cannot provide low or ultra-low dew point air supply conditions; (2) temperature and humidity cannot be controlled separately. Humidity often needs to treat the air to a lower temperature first, and then heat the air to meet the temperature and humidity requirements of the air supply, which wastes more energy; (3) When the dew point required by the air supply is lower than -4°C , due to the frosting problem of the evaporator of the conventional refrigeration system, the operating efficiency of the equipment will be greatly reduced and the energy consumption will be greatly increased
However, drying and dehumidification also have disadvantages: in the dehumidification process, when the desiccant absorbs water, it will release a large amount of heat of adsorption. The heat of adsorption will increase the temperature of the desiccant and cause the ability of the desiccant to absorb water. The temperature of the processing air increases, which increases the energy consumption for cooling the processing air
However, this kind of dehumidifier has a large volume. Compared with conventional desiccant dehumidification equipment, the amount of glue per unit volume is less (the total mass of the metal structure is 18.6kg, and the total mass of silica gel is 1.9kg), and the installation of the cross-flow dehumidifier is more difficult.
In addition, the gas convective heat transfer coefficient is low, which is also not conducive to the dehumidification / regeneration of the desiccant

Method used

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  • Regenerative dehumidifying heat exchanger and its production method
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  • Regenerative dehumidifying heat exchanger and its production method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The manufacturing method of the regenerative dehumidification heat exchanger involved in this embodiment is as follows: figure 1 , 3 Shown:

[0042] In the cleaning and drying process (S1), the tube-fin heat exchanger 1 with a specification of 202×168×25mm and a fin spacing of 1mm and the tube-fin heat exchanger 2 with a specification of 202×168×25mm and a fin spacing of 0.5mm Clean it and dry it with an electric constant temperature blast drying oven at a drying temperature of 40°C ± 0.2°C. After drying, the masses of heat exchanger 1 and heat exchanger 2 are 483.58g and 513.78g, respectively. After the dried tube-fin heat exchanger is placed in the room to cool naturally, in the adhesive coating process (S2), it is coated with adhesive, and after coating, the excess adhesive is removed with a compressed air machine In order not to block the heat exchange air passage, a uniform thin layer of adhesive with a thickness of about 0.1 mm is formed on the surface of the tu...

Embodiment 2

[0047] The manufacturing method of the regenerative dehumidification heat exchanger involved in this embodiment is as follows: figure 2 .3 shows:

[0048] In the cleaning and drying process (S1), the metal sheet with a thickness of about 0.2mm and a mass of 1.00g is cleaned and dried in an electric constant temperature blast drying oven at a drying temperature of 40°C±0.2°C. Put the dried tube-fin heat exchanger in the room to cool naturally, and then carry out the adhesive coating process (S2), and then use a compressed air machine to remove the excess adhesive to form a uniform layer on the surface of the metal sheet. A thin layer of adhesive with a thickness of approximately 0.1 mm. Expose the metal sheet after the process of coating the adhesive (S2) to the air for about 10 minutes to evaporate part of the moisture in the adhesive, and then carry out the process of coating the solid desiccant powder (S3), and the silica gel solid powder Evenly sprinkled on the adhesive,...

Embodiment 3

[0054] The regenerative dehumidification heat exchanger involved in this embodiment has a specific structure such as Figure 4 As shown, the cooling system is a cooling tower system 1, and the heating system is a solar collector system 2.

[0055] This embodiment includes: a cooling tower system 1, a solar collector system 2, and a dehumidification and heat exchange system 3, wherein the dehumidification and heat exchange system 3 is further divided into a regeneration area 33 and a treatment area 32, and the three systems are connected by water pipes.

[0056] The cooling tower system 1 includes: a cooling tower 4 , a water pump 5 , a sprinkler 6 , a water pump 7 , a valve 8 , and a cold water tank 9 . The connection relationship is: one end of the water pump 5 is connected to the cold water tank 9 through a water pipe, the other end of the water pump 5 is connected to the cooling tower 4, the other end of the cooling tower 4 is connected to the valve 8, and the other end of ...

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Abstract

The invention relates to a regenerative desiccant heat exchanger and a manufacturing method thereof which belong to the technical field of refrigeration. The desiccant heat exchanger comprises a cooling system, a heating system and a desiccant heat exchange system, the desiccant heat exchange system can be further divided into a processing area and a regeneration area, the three systems are connected together through a pipeline, the processing area of the desiccant heat exchange system is connected with the cooling system through the pipeline, the regeneration area is connected with the heating system through the pipeline, and the continuous dehumidification can be realized by the mutual switch between a dehumidification area and the regeneration area. The invention respectively carries out the coating treatment of a drying agent of the heat exchanger or a metal sheet and then obtains the regenerative desiccant heat exchanger, the regenerative desiccant heat exchanger adopts chilled water and hot water of an inner tube for cooling and heating the drying agent, the convection heat exchange coefficient of the water is much higher than the convection heat exchange coefficient of gas, thereby being conductive to the dehumidification and the regeneration of the drying agent, leading the size of the device to be more compact and being capable of improving the comprehensive performance of the desiccant heat exchanger.

Description

technical field [0001] The invention relates to a heat exchanger in the technical field of refrigeration and a manufacturing method thereof, in particular to a regenerative dehumidification heat exchanger and a manufacturing method thereof. Background technique [0002] Air dehumidification technology mainly includes several methods including freezing dehumidification, compressed air dehumidification and desiccant dehumidification. The compressed air dehumidification method needs to compress the air, increase the partial pressure of water vapor, and separate the water vapor to obtain dry air after condensation. This method is effective for small air volumes, but it is not suitable for large air volumes. Freezing dehumidification is to reduce the air temperature to the dew point temperature, so that the moisture in the air is condensed to achieve the purpose of dehumidification. The performance of this method is stable, reliable, and can work continuously, and its applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B39/00B05D1/38
Inventor 代彦军彭作战腊栋王如竹李勇
Owner SHANGHAI JIAO TONG UNIV
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