Indirect evaporative cooling and economy cycle in summer air conditioning

Invention and the widely use of air conditioning has improved people’s working and living conditions. However, it also consumes significant amount of energy, accounting for over 40% of total energy used in the buildings. Indirect evaporative cooling (IEC) is a relatively new kind of air conditioning mechanism developed. It is not only uses less energy comparing with traditional air conditioning, but also overcomes the weaknesses of a direct evaporative cooling (DEC) system. The weaknesses of DEC include humidifying the supply air and minimum temperature of supply air is not lower than wet bulb temperature.

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A hybrid indirect evaporative cooling-mechanical vapor compression process for energy-efficient air conditioning

Energy Conversion and Management ◽

10.1016/j.enconman.2021.114798 ◽

2021 ◽

Vol 248 ◽

pp. 114798

Author(s):

Qian Chen ◽

M. Kum Ja ◽

Muhammad Burhan ◽

Faheem Hassan Akhtar ◽

Muhammad Wakil Shahzad ◽

...

Keyword(s):

Energy Efficient ◽

Air Conditioning ◽

Evaporative Cooling ◽

Vapor Compression ◽

Compression Process ◽

Indirect Evaporative Cooling

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Performance Enhancement of Evaporative Cooling by using Bamboo

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.f1161.0886s19 ◽

2019 ◽

Vol 8 (6S) ◽

pp. 856-860 ◽

Cited By ~ 1

Keyword(s):

Water Consumption ◽

Air Conditioning ◽

Performance Enhancement ◽

Evaporative Cooling ◽

Flow Simulation ◽

Human Thermal Comfort ◽

Water Vapors ◽

Evaporative Cooler ◽

Indirect Evaporative Cooling ◽

Comfort Condition

In daily life Air-conditioning plays an essential role in ensuring human thermal comfort. The commercially used cooling systems are intensively power consuming. So that it is necessary to save the energy in air conditioning. Among all of them the evaporative cooling techniques is well known which gives better result in saving energy and it is environmental friendly techniques. Evaporative cooling uses the fact that the water will absorb a relatively large amount of heat in order to evapor ate. The temperature of dry air will dropped because of phase change water into water vapors. Evaporative cooling requires abundant water and it works best when relative humidity is low. Evaporative cooling will be done using three methods direct evaporativ e cooling, Indirect Evaporative cooling, combined direct-indirect evaporative cooling. The main aim of this paper is to make comfort condition in terms of Temperature and Humidity and to minimize the water consumption. In this paper at a place of dry grass or cooling pads we are using hollow bamboo as fluid conduit. In hollow bamboo water continuously flows without any restriction. Some slits or holes are provided on the bamboo to enable the water and air contact and ease the evaporative action after CFD flow simulation. After providing such geometry of contact the evaporation comes to optimism and the water consumption as well as humidity is reduced, the continuous flow of water inside hollow bamboo reduce the contact time of water with air. Due to this effect the humidity of air is comparatively less than direct contact evaporative cooler, also reduces the water consumption. This type of evaporative cooler is designed to facilitate efficient evaporation of the water and circulation of cooled air

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Effect of efficient multi-stage indirect evaporative cooling on performance of solar assisted desiccant air conditioning in different climatic zones.

Heat and Mass Transfer ◽

10.1007/s00231-020-02900-2 ◽

2020 ◽

Vol 56 (9) ◽

pp. 2725-2741

Author(s):

Waqas Ahmad ◽

Muzaffar Ali ◽

Nadeem Ahmed Sheikh ◽

Javed Akhtar

Keyword(s):

Air Conditioning ◽

Evaporative Cooling ◽

Climatic Zones ◽

Multi Stage ◽

Indirect Evaporative Cooling

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Application of indirect evaporative cooling strategies for a warm-humid climate

Journal of Physics Conference Series ◽

10.1088/1742-6596/2042/1/012098 ◽

2021 ◽

Vol 2042 (1) ◽

pp. 012098

Author(s):

José Roberto García Chávez ◽

Anaís Carrillo Salas ◽

Karina A García Pardo

Keyword(s):

Energy Consumption ◽

Air Conditioning ◽

Evaporative Cooling ◽

Maximum Temperature ◽

Passive Cooling ◽

Thermal Mass ◽

Humid Climate ◽

Cooling Strategies ◽

The Mean ◽

Indirect Evaporative Cooling

Abstract Energy consumption in buildings for air conditioning has augmented worldwide by the escalation in global warming. The application of passive cooling is a promising approach to mitigate this situation. The aim of this research was to assess and characterize the performance of indirect evaporative cooling strategies combined with other passive cooling techniques, applied in experimental modules, aimed at providing hygrothermal comfort. Results showed that the investigated strategies presented lower temperatures than the external conditions and the control module. The alternative that combined indirect evaporative cooling with thermal mass, solar protection, and night radiative cooling was the most promising, with a temperature reduction of 4.2 K, relative to the mean exterior temperature, and a decrease of 8.3 K of its maximum temperature relative to the maximum exterior temperature. An additional strategy was implemented in this alternative using a phase change material, that further reduced its temperature by 6.3 K, relative to the mean exterior temperature and a reduction of 11.5 K of its maximum temperature compared to the maximum exterior temperature. It is expected that these findings are applicable in actual buildings in warm-humid regions to reduce energy consumption for air conditioning, whilst improving hygrothermal comfort and health of occupants.

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