Learn vocabulary, terms, and more with flashcards, games, and other study tools. Parker hannifin corporation precision cooling business. Evaporative cooler engineering specification 598 1. In maisotsenko cycle both the direct evaporative cooling and indirect evaporative cooling is couple together. A new approach to analysis and optimization of evaporative cooling system i. Three different types of evaporative cooling pads were used, namely. What are the advantages and disadvantages of evaporative cooling. It will consist of the component parts as listed in the following sections. Performance analysis of an indirect evaporative cooling system using m. Performance evaluation of alternative evaporative cooling. Evaporative cooling occurs when air, that is not too humid, passes over a wet.
This type of evaporative coolers combine indirect with direct evaporative cooling. This cools the air by extracting from it the latent heat of vaporization and the fan circulates the cooled air though the building. Student 2assistant professor 1,2shri sad vidya mandal institute of technology, bharuch392001, gujarat, india abstractthis paper aims to improve the performance of. Duan, zhiyin 2011 investigation of a novel dew point. His theory of adiabatic saturation and the standard psychrometric chart are its roots. Install on the ground or wall, rather than the roof, in order to make maintenance easier for the homeowner.
One must know them to understand the operation of evaporative coolers. Aug 27, 2009 a short presentation about the definition of evaporative cooling and how it compares to traditional air conditioning. Evaporative cooling design guidelines ced engineering. The analysis of variance showed that there were significant differences p 0. Evaporative cooling is based on the thermodynamics of evaporation of water, i. Types of evaporative cooling evaporative cooling works by employing waters large. Evaporative cooling is an energy efficient and environmentally friendly air conditioning technology. The use of evaporative cooling is another application of. Experimental study of cooling tower performance using. Application of the general model to various types of devices although the general model covers both adiabatic and nonadiaba,tic evaporation processes, from ikav 011.
Introduction cooling towers are used for cooling large amounts of water in chemical industry, thermal power plants, nuclear power plants and petroleum industry. Biggest problem facing the indirect evaporative cooling iec technology lies in its high level of dependency to ambient air condition. Pre cooling the air by using evaporative cooling increased the cop from 6. Therefore, this paper intends to present a comprehensive summary on them. Different types of evaporative cooler have been reported in the literature, some of. The primary idea of the indirect evaporative coolers is cooling by decreasing air sensible heat without changing its humidity, which is a distinctive advantage over dec systems. Furnish proof satisfactory to the owner or his representative, of. The following texts are the property of their respective authors and we thank them for giving us the opportunity to share for free to students, teachers and users of the web their texts will used only for illustrative educational and scientific purposes only. A schematic illustration and photo of the used experimental apparatus are shown in fig. The most common example in human is the process of perspiration. Eaphe, energy, evaporative cooling cavity, passive cooling, solar chimney, thermal energy 1. Analysis of the effects of evaporative cooling on the.
The theory of direct evaporative cooling owes much to dr. Theoretical performance analysis of direct evaporative cooler in hot and dry climates ibrahim u. Overview all internal combustion engines are equipped with cooling and lubricating systems that work in conjunction with each other to promote efficient engine operation and performance. This evaporative cooling design guidelines manual for new mexico schools and commercial. The following texts are the property of their respective authors and we thank them for giving us the opportunity to share for free to students, teachers and users of the web their texts will used only for. Performance evaluation of three different types of local. Traditional systems based on the compressor cycle consume a lot of energy. Evaporative cooling uses the fact that water will absorb a.
In the hvac industry, the term cooling tower is used to describe both open and. Pdf performance investigation of evaporative cooling. Evaporative cooling design guidelines cedengineering. Precooling the air by using evaporative cooling increased the cop from 6. Cooling through evaporation is the natural occurrence. Publications iv publications xudong zhao, zhiyin duan, changhong zhan, 2009, dynamic performance of a novel dew point air conditioning for the uk buildings, international journal of lowcarbon technologies. In this paper different cooling pads have been studied. The concepts of trombe wall, solarium, evaporative cooling, ventilation, radiative cooling, wind tower, earth air heat exchanger, roof pond, solar shading for buildings, and building. Experimental study on two type of indirect evaporative cooling heat. Evaporative cooling occurs when air, that is not too humid, passes over a wet surface.
For evaporative cooling, this heat is taken from the air, cooling it as it evaporates. Evaporative cooling, effectiveness, performance, energy saving. Evaporative cooling 3 introduction to the evaporative cooling system for easily understanding the evaporative cooling process you shall know the following basic concepts. Earth air pipe heat exchanger eaphe and solar chimney sc. This system complements direct evaporative cooling, as it consumes low energy to provide cold water, and is able to fulfil the comfort conditions, whereas direct. This simple, yet most efficient, law of nature has been used by humans for comfort cooling systems since the days of ancient egypt and the persian empire. Pdf evaporative cooling of water in a mechanical draft cooling tower. Performance evaluation of alternative evaporative cooling media. Experimental the tested cooling tower is a forced draft counter.
They measured several thermal parameters such as relative humidity rh, dry and wet bulb temperature to evaluate the effect of evaporative cooling on cop. The evaporative cooling module shall be selfcontained. For better human comfort, cooling of living or work environment is vital in tropical climates. During the process of perspiration, it absorbs heat to cool the body. At the point when considering evaporative cooling, one ought to figure out the wet knob and dry globule temperatures of the region. Evaporative cooling differs from typical air conditioning systems, which use vaporcompression or absorption refrigeration cycles. An evaporative cooler has a fan which blows air through a wetted pad, where water evaporates into the air.
Performance analysis of an indirect evaporative cooling system using m cycle devang s. Researches carried out till date in evaporative air cooling process focus mainly on reducing the dry bulb temperature of the incoming air. Taufiq et al 2007 have conducted an energy analysis of. We have examine the work related to concept of evaporative cooling published in referred journals. Ijsrd international journal for scientific research. When warm, dry unsaturated air is pulled through a watersoaked pad, water is evaporated and is absorbed as water vapor into the air. Limitations of inlet air evaporative cooling system for. Nero, the emperor, was using ice for cooling beverages. The results obtained for relative humidity from the greenhouses with different types of evaporative cooling pads, as well as for the conditions outside the greenhouses, at 8 am are shown in table 2 and fig. Evaporative cooling uses the fact that water will absorb a relatively large amount of heat in. Theory qun chena,b, kangding yanga, moran wangc, ning panb, zengyuan guoa akey laboratory for thermal science and power engineering of ministry of education, department of engineering mechanics, tsinghua university, beijing 84, china. Hence, a detailed literature survey has been made on the various studies carried out by the researchers on the different passive cooling techniques, free cooling potential.
Indirect evaporative cooling works on the same principle as direct evaporative cooling lowering air temperature by causing water to evaporate. A thorough search of the current literature showed that there were many studies on the. This paper is an attempt to theoretically analyse the performance of direct evaporative cooler in hot and dry climate with kano being the study area. Although the analytical solution compares well with previous literature data, it does not account for the effect of the evaporative cooling. This adiabatic cooling process is also used to create the chilled water that feeds our indirect evaporative cooling coil. Consider newer types of evaporative coolers, including indirectdirect evaporative coolers.
Theory and basic principle of evaporative cooling system. To evaporate one gallon of water requires almost 8,700 btus of heat. Theoretical efficiency of 100% can be realized when dry bulb. Experimental analysis of cellulose cooling pads used in. Sources of literature numerous articles dealing with theory and working of evaporative cooling have been published over last 5 years, but topic is still under considerable development. Oct 05, 2015 this paper aims to investigate the evaporative cooling limitations of compressor intakeair for improving the performance of gas turbine power plants. In case of cabinet type evaporative coolers, the type of pad material. An evaporative cooler also swamp cooler, swamp box, desert cooler and wet air cooler is a device that cools air through the evaporation of water. A short presentation about the definition of evaporative cooling and how it compares to traditional air conditioning. The limitations of the evaporative cooling capability are analyzed and formulated in terms of the characteristic dimensions involving the temperature ratio, the power gain ratio pgr, thermal efficiency.
The following table 1 from manufacturers literature can be used to estimate leaving. The process of evaporation naturally lowers ambient air temperatures. Evaporative cooling an overview sciencedirect topics. One of the most energyintensive processes in the ventilation and airconditioning is the process of air cooling. A concept of an evaporative cooling utilized with the help of maisotsenko cycle. Chapter 6 cooling and lubrication systems topics 1. Evaporative cooling is a physical phenomenon in which evaporation of a liquid, typically into surrounding air, cools an object or a liquid in contact with it. According to the literature published so far, most of the researcher hold view that the iecs are suitable for. Nowadays, there are two types of evaporative cooling. There are two basic types of evaporative air coolers eacs. The following is an example of how wetbulb temperature impacts an evaporative coolers cooling ability. Research and application of evaporative cooling in china have been very fruitful.
View evaporative cooling research papers on academia. Oxygen 21% nitrogen 78% different gases 0,9% carbonic gas 0,03% water vapour 0,05 1,50% psychometrics. Bac evaporative condensers models cxv, cxvt, vc2, vxmc, vc1, vc1c, vcl brochure. Pdf performance investigation of evaporative cooling pads. Evaporative cooling systems use the same principle as perspiration to provide cooling for machinery and buildings. Evaporative cooling system for storage of fruits and vegetables a. This phase change requires energy, which is called latent heat of evaporation this is the energy required to change a substance from liquid phase to the gaseous one without temperature change. The main difference with an indirect system is that a heat exchanger is used to cool the air supplied to.
A cooling tower is a heatrejection device, which discharges warm air from the cooling tower to the atmosphere through the cooling of water. Research and application of evaporative cooling in china. Study, design and analysis of two stages evaporative cooling system prof. The primary responsibility of a business man is to provide the secure and comfortable feeling to the clients who visit their office. Coolerado coolers abstract a large part of the worlds energy is consumed by ventilation and airconditioning.
Select a model with a cover to minimize maintenance during the offseason. Jul 02, 2014 drawbacks of evaporating cooling system. Review of passive heatingcooling systems of buildings. Modeling, indirect evaporating coolers, thermal comfort, performance. A general mathematical model of evaporative cooling devices. Effectiveness of evaporative cooling weve all walked through water misters on hot summer days and immediately felt the cooling effect. The main disadvantage of this kind of particular cooling is that it is only applicable in dry atmospheres. Direct evaporative cooling dec keeps the primary product air in direct contact with water, which causes evaporation of the water and so the reduction of temperature. Performance analysis of an indirect evaporative cooling. The use of evaporative cooling is another application of refrigeration used olden days. They claimed that evaporative cooling is more efficient where the climate is hot. An experimental performance investigation of evaporative cooling pads of different materials based on weather data of ahmedabad, india has been carried out. Evaporative cooling evaporative cooling is a very efficient means of heat dissipation, as one litre evaporated sweat removes 672 wh from the body at a temperature of 35 c.
Further, the east indians were able to produce refrigeration by dissolving salt in water as early as 4 th century a. Its material is chemically impregnated with special compounds to prevent rot and ensure a long service life. It is not successful in the areas where the dampness is high. A general mathematical model of evaporative cooling devices 6. A new approach to analysis and optimization of evaporative. International journal of engineering research and general. These heat and mass transfer devices are based on the evaporative cooling of water in contact with ambient air. The temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor, which requires much less energy than refrigeration. Experimental study of cooling tower performance using ceramic. An investigation of indirect evaporative coolers, iec with respect to.
Theory qun chena,b, kangding yanga, moran wangc, ning panb, zengyuan guoa akey laboratory for thermal science and power engineering of ministry of education, department of engineering mechanics, tsinghua university, beijing 84, china b biological and agricultural. The limitations of the evaporative cooling capability are analyzed and formulated in terms of the characteristic dimensions involving the temperature ratio, the power gain ratio pgr, thermal efficiency change, and humidity ratio. Course contents evaporative coolers, often called swamp coolers, are cooling systems that use only water and a blower to circulate air. This is accomplished by passing air inside a heat exchanger that is cooled by evaporation on the outside. Study, design and analysis of two stages evaporative. Cooling air temperatures that can be achieved by a direct evaporative cooler at various outdoor conditions image courtesy of calcsplus.
The driving force of either direct or indirect evaporative cooling is the temperature difference between the drybulb table 1 a general comparison between the currently available air conditioning systems. Direct evaporative cooling is an adiabatic process where the dry bulb temperature is lowered without changing the amount of heat idec dec dec idec in the air. Bac evaporative condensers models cxv, cxvt, vc2, vxmc. Evaluation of evaporative cooling systems in industrial buildings article pdf available in international journal of heat and technology 333. This paper aims to investigate the evaporative cooling limitations of compressor intakeair for improving the performance of gas turbine power plants.
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