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Method for cooling heat exchanger

A technology of heat exchangers and cooling methods, applied in energy-saving heating/cooling, chemical instruments and methods, heating methods, etc., can solve the problems of reduced cooling efficiency, increased power consumption, and temperature rise of outdoor units, so as to alleviate the heat island phenomenon, Effect of reducing power consumption and reducing output

Active Publication Date: 2011-08-17
DAICEN MEMBRANE SYSTEMS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the roof is exposed to strong sunlight in summer, the temperature of the outdoor unit (heat exchanger) itself rises, resulting in lower heat dissipation characteristics
Especially when a plurality of outdoor units (heat exchangers) are collectively arranged in a narrow space, the heat generated by each outdoor unit will fill the narrow space, causing the air temperature at the location where the outdoor unit is installed to rise further. Therefore, Exothermic properties are greatly reduced
In addition, there is a problem that when other installations are placed close to each other and the circulation of air becomes poor, the temperature of the installation area will further rise due to the heat generated by the entire outdoor unit, and the heat radiation characteristics will be greatly reduced.
In this way, when the heat dissipation characteristics are lowered, the indoor cooling becomes insufficient, leading to a vicious cycle of increasing power consumption in order to improve the cooling capacity.
[0004] In addition, in large-scale factories, even if the outdoor unit is installed on the north side of the building, the cooling efficiency will sometimes be reduced in summer due to the large cooling space. For factories such as food processing or food material processing, it is necessary to maintain a certain In the case of low temperature, sometimes it is necessary to lower the set temperature of the air-conditioning equipment to operate the air-conditioning equipment

Method used

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  • Method for cooling heat exchanger
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Using the following conditions, the power consumption of the air conditioner when the present invention is not applied and the maximum required power as the basis of the contract electricity rate, and the power consumption and the maximum required power of the air conditioner when the present invention is applied are estimated.

[0068] Location: Food factory in Nagano Prefecture, 40 outdoor units, total power consumption 272kwh

[0069] Period: 4.5 months from May 15, 2008 to September 30, 2008

[0070] Time: From 7:00 am to 7:00 pm

[0071] Watering setting temperature: 25°C

[0072] RO treatment device: made by Datsun Membrane System Co., Ltd. (capacity: 3000L / hr, conductivity 6-8μS / cm)

[0073] The total power consumption required for the air conditioner when the present invention is not applied is 4,115,000 KW, and the total power consumption required for the air conditioner when the present invention is applied is 3,919,000 KW. The power consumption of the RO t...

Embodiment 2

[0075] An outdoor unit and a water recovery tray were installed in a laboratory whose temperature was adjusted to 27.4° C. (outdoor air temperature shown in Table 1), and an air conditioner (MBZ-J228 manufactured by Mitsubishi Electric Corporation) was installed outside the laboratory. While operating the air conditioner in this state, the RO treated water was sprayed on the outdoor unit under the following conditions. The results are shown in Table 1.

[0076] (sprinkling conditions)

[0077] Water: tap water (water temperature about 25°C)

[0078] Sprinkling amount: 400ml / min

[0079] Number of nozzles for watering the outdoor unit: 2

[0080] Sprinkling form: always sprinkling

[0081] RO device: NRX20-P (manufactured by Darsen Membrane Systems Co., Ltd.)

[0082] RO membrane: SW02200-DRA982P

[0083] Conductivity of RO permeate water: 5μS / cm

[0084] Table 1

[0085]

[0086] Power reduction rate (%): ((power consumption before watering starts - power consumptio...

Embodiment 3

[0094] For 14 days (being about 100 hours in total), under the same sprinkling conditions, use 4 sprinkling nozzles, spray RO treatment water to two outdoor units (heat exchangers) of the same product (using the same device as in Example 2) The obtained RO treated water has an electrical conductivity of 6-8 μS / cm) and tap water (tap water in Tokyo) to test the adhesion state of scale. The result of spraying RO treated water, such as image 3 As shown in the figure, no scale adhesion was confirmed on the surface of the heat sink. The result of spraying tap water, such as Figure 4 As shown in the figure, the adhesion of scale was confirmed on the surface of the heat sink. In the case of spraying tap water, the adhesion of scale was confirmed after 14 days of watering. Therefore, in the case of continuous watering in summer, if the scale is not properly removed, it is presumed that the cooling efficiency is likely to decrease.

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Abstract

Water treated with a reverse osmosis membrane device (12) is introduced into a circulation line (23) and sprinkled from spray nozzles (14) onto outdoor units (heat exchangers) (15a to 15d). Since the treated water contains none of Ca, Mg, and Cl ions and the like, scale deposition does not occur on the heat exchangers (15a to 15d) and a high cooling effect can be maintained.

Description

technical field [0001] The invention relates to a cooling method of a heat exchanger capable of improving refrigeration efficiency and significantly reducing power consumption and a device suitable for implementing the method. Background technique [0002] The air conditioner is composed of an indoor unit and an outdoor unit for releasing indoor heat to the outside, and the outdoor unit has a heat exchanger for releasing heat. [0003] Usually, in urban office buildings, outdoor units are often installed on the roof, and in large buildings, many outdoor units (heat exchangers) are often arranged in a limited space on the roof in a concentrated state. Since the roof is exposed to strong sunlight in summer, the temperature of the outdoor unit (heat exchanger) itself rises, and the heat radiation characteristic decreases. Especially when a plurality of outdoor units (heat exchangers) are collectively arranged in a narrow space, the heat generated by each outdoor unit will fill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F1/00C02F1/44
CPCF28D5/02Y02B30/545F25B2339/047F24F5/0035C02F2103/023C02F1/441Y02B30/54
Inventor 笠井庸三加藤直史岩崎哲也
Owner DAICEN MEMBRANE SYSTEMS LTD