Effect of heat exchanger plates geometry on performance of an indirect evaporative cooling system

Evaporative cooling is now an alternative method for the conventional air cooling method. This method does not only save energy but also protect the environment from global warming and hazardous gases. Thus this system is highly efficient and eco-friendly. Evaporative cooling system is further divided into two categories that are direct evaporative cooling system and an indirect evaporative cooling system. The direct evaporative cooling system is not much efficient due to high wet bulb temperature and moisture thus rather than using the direct evaporative cooling system the indirect evaporative cooling system is preferred. This paper discusses comparative studies of performance, working principles, material selection criteria’s and various methods. It also explains the performance under different weather conditions, hybrid structure to reduce the load on the further system. It summarises various aspects like wick attained aluminium sheet is the best material for IEC or counter-flow heat exchanger is effective than parallel-flow heat exchanger. It finally results that indirect evaporative cooling system is moisture free, very effective and environment savings. That can be used in various residential and commercial sectors effectively as an alternative for conventional energy-consuming system.

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Study on heat transfer characteristics of indirect evaporative cooling system based on secondary side hydrophilic

Energy and Buildings ◽

10.1016/j.enbuild.2021.111704 ◽

2021 ◽

pp. 111704

Author(s):

Yuwen You ◽

Guo Wang ◽

Bin Yang ◽

Chunmei Guo ◽

Yiwei Ma ◽

...

Keyword(s):

Heat Transfer ◽

Cooling System ◽

Evaporative Cooling ◽

Heat Transfer Characteristics ◽

Transfer Characteristics ◽

Evaporative Cooling System ◽

Indirect Evaporative Cooling ◽

Secondary Side

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The Effect of Dry and Wet Bulb Temperature Variation on the Performance of the Indirect Evaporative Cooler

Tikrit Journal of Engineering Sciences ◽

10.25130/tjes.26.4.02 ◽

2019 ◽

Vol 26 (4) ◽

pp. 8-15

Author(s):

Maki Zaidan ◽

Fayadh Abed ◽

Ali Farhad

Keyword(s):

Heat Exchanger ◽

Environmental Changes ◽

Cooling System ◽

Evaporative Cooling ◽

Computer Software ◽

Volumetric Flow Rate ◽

Weather Conditions ◽

Centrifugal Fan ◽

Pipe Length ◽

Evaporative Cooling System

The research is about designing and building up an evaporative cooling system, working by two- stages evaporative cooling system using outer air (pure air). The system is founded by designing and making a heat exchanger of orthogonal flow from Aluminum sheets of (30*60*40) cm, which represents the first stage of the system (indirect stage). The second stage (direct stage) of the system is represented by making an equipment of air washing (cylindrical) with (45 height, 60 width, 3 thickness) cm. The cooling system pulls outer air by a Centrifugal fan. The air passes through the heat exchanger pipes to be cooled tangibly (without moistening). Then it goes over the equipment of air washing to be cooled and cools the specified space. Computer software was designed by FORTRAN Language (FORTRAN 90) to predict the evaporative air cooler performance to know the proper environmental and design conditions of the system. Some variables were made to study their effect on the thermal performance of the system. The studied variable is to change the volumetric flow rate of air from (750 cfm) to (2000 cfm) of the dry side, and from (750 cfm) to (2500 cfm) of the wet side. The pipe length was changed from (20 cm) to (45 cm), and its diameter from (0.5 cm) to (3 cm). Those were the design changes. On the environmental changes, we studied the effect of changing the temperature on the dry or wet bulb of the system. The study is taken place in Tikrit University (34. 35N; 43.37 E), to determine the suitability of the weather conditions of the region for the work of the system. It was taken place in the late August for two consecutive days, with readings of 24 hours. The results show that the best quantity of the air supplied, which represent the best performance of the system (750 cfm) and (1000 cfm) for the wet side when the diameter (1-1.5 cm) and length is (45 cm). The results show also the possibility of the work of this system for the region mentioned because it is characterized by its hot and dry climate in the summer, as the efficiency of evaporative evaporator increases the hot and dry environment by 80%.

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An Overview of Different Indirect and Semi-Indirect Evaporative Cooling System for Study Potency of Nanopore Skinless Bamboo as An Evaporative Cooling New Porous Material

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences ◽

10.37934/arfmts.79.2.123130 ◽

2021 ◽

Vol 79 (2) ◽

pp. 123-130

Author(s):

I Nyoman Suprapta Winaya ◽

Hendra Wijaksana ◽

Made Sucipta ◽

Ainul Ghurri

Keyword(s):

Energy Consumption ◽

Porous Material ◽

Cooling System ◽

Evaporative Cooling ◽

Temperature Drop ◽

High Energy ◽

Dew Point ◽

Air Cooling ◽

Evaporative Cooling System ◽

Indirect Evaporative Cooling

The high energy consumption of compressor based cooling system has prompted the researchers to study and develop non-compressor based cooling system that less energy consumption, less environment damaging but still has high enough cooling performances. Indirect and semi indirect evaporative cooling system is the feasible non-compressor based cooling systems that can reach the cooling performance required. This two evaporative cooling system has some different in construction, porous material used, airflow scheme and secondary air cooling method used for various applications. This paper would report the cooling performances achieved by those two cooling system in terms of cooling efficiency, cooling capacity, wet bulb effectiveness, dew point effectiveness, and temperature drop. Porous material used in indirect and semi-indirect evaporative cooling would be highlighted in terms of their type, size, thickness and any other feature. The introduction of nanopore skinless bamboo potency as a new porous material for either indirect or semi-indirect evaporative cooling would be described. In the future study of nanopore skinless bamboo, a surface morphology and several hygrothermal test including sorption, water vapor transmission, thermal conductivity test would be applied, before it utilize as a new porous material for direct or semi indirect evaporative cooling.

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