Feasibility study of Maisotsenko indirect evaporative air cooling cycle in Iran (original) (raw)
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Exergy Analysis of Evaporative Cooling for Optimum Energy Consumption in Diverse Climate Conditions
In this paper, exergy of conditioned air, exergy efficiency, irreversibility, and entropy generation of common models of evaporative cooling have been investigated in five cities of Iran. Direct evaporative cooling (DEC), indirect evaporative cooling (IEC), and twostage IEC/DEC as the most popular methods of cooling have been modeled. Atmospheric conditions are considered as the dead state of each city. Exergy analyses of conditioned air are based on the output results of the theoretical modeling of evaporative cooling. Moreover, exergy balances of three cooling methods are derived. Thus, exergy destruction, reversible work, and entropy generatiom are calculated according to the exergy balances. The results obtained reveal that Bam, which is a hot city with medium relative humidity (24%RH), has the best exergy efficiency of direct evaporative cooling. The highest exergy efficiency of twostage indirect/direct evaporative cooling belongs to Kerman. Kerman with the lowest dry-bulb temperature has medium relative humidity (24%RH). In addition, total output exergy of air in Yazd is more than other cities. Yazd is a hot-dried city with rather low relative humidity (19.5%RH).
Exergy analysis of evaporative cooling to select the optimum system in diverse climates
Energy, 2012
In this paper, an exergy analysis is applied to indicate the exergy efficiency and irreversibility of common models of evaporative cooling. Exergy analysis of conditioned air are based on the results of experimental investigations on the direct, indirect, and two-stage indirect/direct evaporative cooling for six cities in Iran, each having various weather conditions. For this purpose, exergy balances of three cooling methods are derived. The results obtained reveal that for a comprehensive efficiency analysis, both the first and second law of thermodynamics should be considered. Furthermore, the direct evaporative coolers work best in temperate and dry climate with estimated exergy efficiency of 20%. The indirect evaporative coolers are more efficient in hot and dry climate with approximate exergy efficiency of 55%. The indirect/ direct evaporative coolers are better choice for hot and semi-humid climate with exergy efficiency of about 62%.
Building and Environment, 2009
Cooling performance of two-stage indirect/direct evaporative cooling system is experimentally investigated in the various simulated climatic conditions. For this purpose, a two-stage evaporative cooling experimental setup consisting of an indirect evaporative cooling stage (IEC) followed by a direct evaporative cooling stage (DEC) was designed, constructed and tested. Due to the wide variety of climatic conditions in Iran, two air simulators were provided to simulate outdoor design condition of different cities in primary and secondary air streams. Results show that under various outdoor conditions, the effectiveness of IEC stage varies over a range of 55-61% and the effectiveness of IEC/DEC unit varies over a range of 108-111%. Aspects of achieving comfort conditions and power saving have been investigated with related excess water consumption. Considering the evaporative comfort zone, this system can provide comfort condition in a vast region in Iran where direct evaporative alone is not able to provide summer comfort condition. More than 60% power saving could be obtained by this system in comparison with mechanical vapor compression systems with just 55% increase in water consumption with respect to direct evaporative cooling systems. This system can fill the gap between direct evaporative cooling systems and mechanical vapor compression systems as an energy efficient and environmentally clean alternate.
Thermodynamic performance assessment of a novel air cooling cycle: Maisotsenko cycle
International Journal of Refrigeration, 2011
This study presents energy and exergy analyses and sustainability assessment of the novel evaporative air cooling system based on Maisotsenko cycle which allows the product fluid to be cooled in to a dew point temperature of the incoming air. In the energy analysis, Maisotsenko cycle's wet-bulb and dew point effectiveness, COP and primary energy ratio rates are calculated. Exergy analysis of the system is then carried out for six reference temperatures ranging from 0 C to 23.88 C as the incoming air (surrounding) temperature. The specific flow exergy, exergy input, exergy output, exergy destruction, exergy loss, exergy efficiency, exergetic COP, primary exergy ratio and entropy generation rates are determined for various cases. Furthermore, sustainability assessment is obtained using sustainability index method. As a result, maximum exergy efficiency is found to be 19.14% for a reference temperature of 23.88 C where the optimum operation takes place.
Study The appropriateness of Iraqi Climatic Conditions to The applications of Evaporative Cooling
Mustansiriyah University, 2018
Increasing of temperature rate during summer period in Iraq reached 47Cº and continuous in its increase additionally resulted in increasing of demand on electricity power for cooling purposes, and because of using cooling and air conditioning devices which consume large electrical power make the load reaching the peak for the electrical system during this period and this effects on electricity power stations which have become one of the big problems Iraq suffering from it, and considering using evaporation devices, especially the evaporation coolers which low consume electrical power(complementary) amount (60%-80%) compared with other systems make them more common systems in Iraq especially with the availability of the suitable climate conditions for they resulted in decline in relative humidity rates which are always less than (60%) and temperature rates ranged from (26Cº- 47Cº),the study results have demonstrated that all Iraqi regions are suitable for evaporation cooling applications with efficiency rate(46%) also demonstrated that the best period for the cooling system work is(July) of summer season with efficiency(60%) and the best region for evaporation cooling application during the summer period is center of (Basra) city where higher efficiency of amount(55%).
Evaporative cooling as an efficient system in Mediterranean region
Applied Thermal Engineering, 2011
In this work, indirect evaporative air-conditioning was thermally designed in order to reduce energy consumption without negatively affecting the thermal comfort and in order to lower the imported oil bill on the national level and reducing the emission of harmful gasses to the environment on the international level. Moreover, the economic impact of such system was studied. The outcomes show that indirect evaporative air-conditioning can be covered most of the total annual load at 1100 l s-1. Furthermore, once indirect evaporative air-conditioning in 500,000 Mediterranean residential buildings are used instead of traditional one, the annual estimated energy saving is about 1,084 GWh/a and the annual total avoided CO2 emission is estimated to be 637,873 Ton. The payback period for such system from the saving that occurred is less than two years.
A Review on Potential of Indirect Evaporative Cooling System
One of the world's most energy consuming sector is heating, ventilation and air conditioning. A lot of energy is consumed by traditional cooling systems based on the conventional vapour compression refrigeration cycle. The VCR system which contains refrigerants in circuits produced a harmful effect on environment and also dangerous to human life if leakages occur. These factors were mainly responsible for the development of evaporative coolers. In direct evaporative cooling system, it will give adequate temperature drop of air with increase in humidity which is not desirable for human health. So for overcoming these difficulties, indirect evaporative cooling system will be used for air coolers in which heat mass exchanger is used. To get higher temperature drop and wet bulb effectiveness above 100%, Scientist Valeriy Maisotsenko developed Maisotsenko cycle. The aim of our study is to find the best alternative of existing conventional cooling systems.
Energy, 2020
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Investigation of Maisotsenko Cycle (M-cycle) Air-Conditioning System for Multan(Pakistan)
2017
This study investigates the applicability of Maisotsenko cycle evaporative cooling system for climatic conditions of Multan region (Pakistan). The study also provides comparison of (Maisotsenko-cycle) M-Cycle based system with other evaporative cooling systems. An experimental system of M-Cycle has been setup and experiments are conducted for various ambient air conditions. The data has been analyzed, and based on the analyses the performance of the proposed M-cycle system has been investigated for summer (April to September) climatic conditions of Multan region (Pakistan). It has been found that the proposed system can provide the useful air-conditioning effect for Multan climate conditions provided that the ambient air relative humidity does not exceed 60%. The system's applicability is found limited in humid conditions, which is due to nature of M-cycle operation.