Indirect Evaporative Cooling – An Energy Efficient Way for Air Conditioning

2012 ◽  
Vol 608-609 ◽  
pp. 1198-1203
Author(s):  
Min Lei Chen ◽  
Xiao Long Liu ◽  
Eric Hu
Keyword(s):  
Total Energy ◽  
Minimum Temperature ◽  
Energy Efficient ◽  
Air Conditioning ◽  
Evaporative Cooling ◽  
Living Conditions ◽  
Direct Evaporative Cooling ◽  
Energy Accounting ◽  
Indirect Evaporative Cooling ◽  
Working And Living Conditions

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.

scholarly journals Passive evaporative cooling through water-filled bricks: a preliminary investigation

2021 ◽  
Vol 2069 (1) ◽  
pp. 012123
Author(s):  
A Tejero-González ◽  
F Nocera ◽  
V Costanzo ◽  
E Velasco-Gómez
Keyword(s):  
Energy Efficient ◽  
Air Conditioning ◽  
Current Knowledge ◽  
Preliminary Investigation ◽  
Evaporative Cooling ◽  
Passive Cooling ◽  
Air Velocity ◽  
Direct Evaporative Cooling ◽  
Geometric Arrangements ◽  
Hollow Bricks

Abstract Direct evaporative cooling is widely known to be an energy efficient air-conditioning option for arid and semi-arid climates. However, care must be taken on humidity ranges achieved indoors. Existing literature presents several options for integrating evaporative cooling within buildings for passive cooling applications. This work aims at expanding the current knowledge by focusing on the use of water-filled hollow bricks to implement evaporative cooling of air in contact with the brick’s surfaces. A prototype is built and experimentally characterized under controlled air velocity, air temperature and relative humidity conditions. Results on the psychrometric conditions achieved under different geometric arrangements (i.e., with one, two or three rows of four bricks each) are presented and discussed. Insights on likely building integration of the system for passive cooling purposes in farms and agriculture applications are eventually given.

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

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

scholarly journals A MATHEMATICAL MODEL FOR DIRECT EVAPORATIVE COOLING AIR CONDITIONING SYSTEM

2003 ◽  
Vol 2 (2) ◽  
Author(s):  
J. R. Camargo ◽  
C. D. Ebinuma ◽  
S. Cardoso
Keyword(s):  
Mathematical Model ◽  
Air Conditioning ◽  
Cooling System ◽  
Convective Heat Transfer Coefficient ◽  
Evaporative Cooling ◽  
Experimental Tests ◽  
Water Evaporation ◽  
Human Thermal Comfort ◽  
Direct Evaporative Cooling ◽  
Evaporative Cooling System

Air conditioning systems are responsible for increasing men's work efficiency as well for his comfort, mainly in the warm periods of the year. Currently, the most used system is the mechanical vapor compression system. However, in many cases, evaporative cooling system can be an economical alternative to replace the conventional system, under several conditions, or as a pre-cooler in the conventional systems. It leads to a reduction in the operational cost, comparing with systems using only mechanical refrigeration. Evaporative cooling operates using induced processes of heat and mass transfer, where water and air are the working fluids. It consists in water evaporation, induced by the passage of an air flow, thus decreasing the air temperature. This paper presents the basic principles of the evaporative cooling process for human thermal comfort, the principles of operation for the direct evaporative cooling system and the mathematical development of the equations of thermal exchanges, allowing the determination of the effectiveness of saturation. It also presents some results of experimental tests in a direct evaporative cooler that take place in the Air Conditioning Laboratory at the University of Taubaté Mechanical Engineering Department, and the experimental results are used to determinate the convective heat transfer coefficient and to compare with the mathematical model.

scholarly journals Experimental Investigation of a Split Air Conditioning Using Condensate as Direct Evaporative Cooling

2021 ◽  
Vol 86 (1) ◽  
pp. 140-153
Author(s):  
Azridjal Aziz ◽  
Muhammad Rif’at Syahnan ◽  
Afdhal Kurniawan Mainil ◽  
Rahmat Iman Mainil
Keyword(s):  
Air Conditioning ◽  
Evaporative Cooling ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Cooling Load ◽  
Air Conditioner ◽  
Direct Evaporative Cooling ◽  
Compressor Power ◽  
Discharge Pressure ◽  
Air Conditioning Systems

Split air conditioning systems produce reasonable amount of condensate which is usually not utilized and thrown away to the environment. On the other hand, it consumes a lot of energy during operation. The aim of this study is to investigate the improvement of air conditioning systems performance utilizing condensate. A direct evaporative cooling using condensate is incorporated on a 0.74 ton-cooling capacity of split air conditioning to decrease the air temperature before entering the condenser. Performances of the split air conditioning with and without direct evaporative cooling are compared and presented in this paper. The results show that the use of direct evaporative cooling using condensate into the air before passing through the condenser reduces the compressor discharge pressure. The decrease of the condenser pressure led to 4.7% and 7% reduction of power consumption for air conditioner without cooling load and air conditioner with 2000 W cooling load, respectively. The cooling effect and coefficient of performance (COP) increase with the decrease of compressor power. The use of direct evaporative cooling with condensate into the air before entering the condensing system can enhance the system performance and protect the environment.

scholarly journals Performance Enhancement of Evaporative Cooling by using Bamboo

2019 ◽  
Vol 8 (6S) ◽  
pp. 856-860 ◽  
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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