Design Optimization and Installation of the Evaporative Cooler in the Perspective of Bangladesh (original) (raw)
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AIP Conference Proceedings 1851(1):020075, 2017
The present study aimed to evaluate the feasibility of coconut coir pads, jute fiber pads and sackcloth pads as alternative pad materials. Experimental measurements were conducted and the experimental data were quantitative. The experimental work mainly focused on the effects of different types and thicknesses of evaporative cooling pads by using forced draft fan while changing the environmental conditions. Experiments are conducted in a specifically constructed test chamber having dimensions of 12’X8’X8’, using a number of cooling pads (36”X26”) with a variable thickness parameters of the evaporative cooling pads i.e., 50, 75 and 100 mm. Moreover, the experimental work involved the measurement of environmental parameters such as temperature, relative humidity, air velocity, water mass flow rate and pressuredrops at different times during the day. Experiments were conducted at three different water mass flow rates (0.25 kgs⁻¹, 0.40 kgs⁻¹ & 0.55 kgs⁻¹) and three different air velocities (3.6 ms⁻¹, 4.6 ms⁻¹& 5.6 ms⁻¹). There was a significant difference between evaporative cooling pad types and cooling efficiency. The coconut coir pads yielded maximum cooling efficiency of 85%, whereas other pads yielded the following maximum cooling efficiency: jute fiber pads 78% and sackcloth 69% for higher air velocity and minimum mass flow rate. It is found that the maximum reduction in temperature between cooling pad inlet and outlet is 4°C with a considerable increase in humidity. With the increase of pad thickness there was an increment of cooling efficiency. The results obtained for environmental factors, indicated that there was a significant difference between environmental factors and cooling efficiency. In terms of the effect of air velocity on saturation efficiency and pressuredrop, higher air velocity decreases saturation efficiency and increases pressuredrop across the wetted pad for maximum flow rate. Convective heat transfer co-efficient has an almost linear relationship with air Velocity. Water consumption or evaporation rate increases with the increase in air velocity. Finally, the present study indicated that the coconut coir pads perform better than the other evaporative cooling pads and have higher potential as wetted-pad material. The outcomes of this study can provide an effective and low-cost solution in the form of evaporative cooling system, especially in an agricultural country like Bangladesh.
Development and Fabrication of Modified Evaporative Cooler
– An evaporative cooler also known as swamp cooler or desert cooler, is a device that cools air through the evaporation of water. Evaporative cooling differs from typical air conditioning system which use vapour compression or absorption refrigeration cycle. Evaporative cooling works by using water's large enthalpy of vaporization. The temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor which is known as evaporation, which can cool air using much less energy than refrigeration. In this system we are using this concept for cooling of air. We have designed a air cooler that does not contain water pump , while the other coolers present in the market which are equipped with water pump to wet the cooling material. We have also used air filters at the outer vents of the cooler so that we can able to clean as well as cool the air and also make it more hygienic. By designing the cooler in such a manner we were able to wet the cooling material completely and get good results out of it.
Charcoal has been done in a specially design and fabricated evaporative cooling system. The objective is to analyse cooling effectiveness and cooling capacity at different velocities of air. Indore – MP and nearby places where temperature is in the range of 39 • C to 42 • C in summer days with relative humidity 22% to 29 %, in this scenario evaporative cooling is a good option. This analysis has been done on a special evaporative cooler maintains cool interior temperature for food preservation purpose. While these devices are not typically capable of maintaining temperatures of 2-3 degrees Celsius, they can be significantly cooler than ambient temperature. An evaporative cooler uses the principal of evaporative cooling to maintain a cool interior temperature for refrigeration and food preservation. The device is constructed from an open timber frame with evaporative pad material filled sides, which is kept continually moist. As warm, dry air flows through the moist material, water is evaporated into the air and it is cooled.
Experimental Investigation of Modified Direct Evaporative Cooler Using Heat Pipe
2019
Article history: Received 28 September 2018 Received in revised form 29 October 2018 Accepted 4 December 2018 Available online 18 March 2019 Nowadays, keeping environment at comfort zone with conventional cooler become expensive, especially in wide and semi outdoor spaces. Evaporative cooler which offer a healthy, non-harmful materials, and low cost can be an alternative to keep environment healthy and comfortable. The objective of this experiment is to determine and compare the performance of direct evaporative cooler embedded with heat pipes and without heat pipes. Heat pipes are placed in the section before cooling pad and work as indirect stage. Evaporator sections of heat pipe are placed before cooling pad and the condenser section are placed in the addition sump. The results show that the saturation efficiency of both system increase along with the increase in inlet temperature and decrease along with the decrease in relative humidity. The saturation efficiency also decreases ...
A Review on performance parameters and its evaluation of evaporative air cooler
Journal of emerging technologies and innovative research, 2019
According to World Weather Information Service, Asia the maximum temperature recorded in India is 50°C on the plateau region. Thus, fresh air ventilation and efficient cooling has now become a necessity in both residential as well as industrial areas. Air conditioner provide insufficient cooling in drier regions, even they record higher power consumption upto 675kW/hr per month, under low relative humidity condition of about 40% at 35°C temperature. Hence in dry and hot regions like Vidarbha or central plateau region in India, mostly Air coolers are used for residential purposes. Even among coolers, Evaporative (Desert) Air cooler has proven to be efficient as compared to other cooler units. Desert coolers are highly efficient in dry, hot regions. Their power consumption is comparatively less than air conditioners about 54kW/hr per month under similar conditions, since pump and fan are the only two power driven components used. The paper reviews the different factors to be considere...
Theoretical Performance Analysis Of Direct Evaporative Cooler In Hot And Dry Climates
International Journal of Scientific & Technology Research, 2014
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. The performance of the cooler was determined at different air velocities at a saturation effectiveness of 50% to 90%. The determined parameters are the leaving air temperature, relative humidity, cooling capacity and the water consumption rates. Th e result shows that leaving air temperature of 21.9 0 C and relative humidity of 82% were obtained with pad material of 90% saturatio n effectiveness. The cooling capacity and the water consumption rates are found to vary linearly with the saturation effectiveness. It is ther efore axiomatic that direct evaporative coolers have high potential of providing thermal comfort for people in occ upied spaces when moderate air velocities are used with pad materials of relatively higher saturation effectiveness.
DEVELOPMENT OF ECONOMIC EVAPORATIVE AIR COOLING SYSTEM
Thermal environmental conditions have very good role in human occupancy and their maximum productivity. Both indoor space conditions and personal factors necessary to provide comfort.it includes the interaction of various parameters like temperature, thermal radiation, humidity, air speed, personal activity level, and clothing Due to global warming ,entire atmospheric conditions are varied very much. temperature level is increasing day by day due to this scenario, this makes uncomfortable for the human beings for doing their jobs with maximum productivity. We are considered our class room where the whole students have been unable to concentrate on their studies due to the uncomfortable room temperature. These will leads to hope of developing an economic evaporative air cooling system in our class room, it will reduce the excessive temperature rise and humidity level in the classroom during the summer. An evaporative cooler produces effective cooling by combining a natural process-water evaporation with a simple, reliable air-moving system. A case study has been done in order to determine the cause of uncomfortable conditions in the class room.
Heat Transfer Research, 2020
In this article the performance of one stage direct evaporative cooler (DEC) and two stage indirect-direct cooler (IEC-DEC) in the environment of Saudi Arabia is assessed experimentally. The wet pad used in direct evaporative coolers is one of the main part affecting the output of an evaporative cooler. In this study three combinations of pad materials: aspen fiber (Case-I), corrugated cellulose (Case-II) and a combination of fiber aspen and corrugated cellulose (Case-III) were focused as a wet media for water evaporation and the performance of these pad materials was analyzed in detail. The main design parameter considered is the water flow rate in the designing of both coolers. During the testing of the both coolers ambient temperature in the range from 28 oC to 42 oC and relative humidity lower than 65% was considered to cool the working air. Air temperatures and relative humidity were measured and the effectiveness of the coolers was determined. The results obtained show effectiveness of IEC-DEC cooler is in range of 95-110 %, while effectiveness of DEC cooler is 85-93%. As an overall the IEC-DEC cooler with pad material of combination of fiber aspen and corrugated cellulose showed comparatively better performance.
PERFORMANCE OF EVAPORATIVE COOLING SYSTEMS WITH CHILLED WATER
Many climatic records indicate that the average temperature of many countries have increased at least by one degree and also have changed the rainfall pattern to a certain extent. These have made the conditions in warm humid tropical countries somewhat undesirable. With improved economic conditions in many countries in the Asian region, a shift to air conditioning can be seen in office buildings, factories and houses. An energy efficient alternative to air conditioning is the use of evaporative cooling. However, its performance in months with higher moisture content that results in higher relative humidity cannot be efficient and hence there is a barrier for its popularization. One option available is the use of chilled water for improved performance. This research highlights the thermal performance that can be achieved with chilled water and the responses that have been obtained from the workers of a large factory complex located in Sri Lanka where the humidity ratio can reach 0.018 during some months.
Review on Two Stage Evaporative Cooler
Evaporative cooling is eco-friendly and energy efficient technology. There are mainly two types of evaporative technology, in which direct and indirect evaporative cooling takes place. Where in direct evaporative cooling there is adiabatic humidification and for reduction in relative humidity by means of cooling of air in heat exchanger. In case of indirect evaporative cooling the water sprayed in the heat exchanger. Primary purpose is to cool the air from the atmosphere to secondary air in the desired heat exchanger channel. All this concepts are taken in concern for the easiness, zero pollution with the energy efficiency of the cooling technology. From domestic purpose up to large industrial applications this evaporative cooling technology has been regularly used on large scale. In this review paper we have tried to explain the present the experimental work and research on the direct and evaporative cooling technology on the basis of their design, modelling and application by the details of studies in the terms of various performance tests and optimisation taking concern of heat and optimisation taking concern of heat and mass transfer also.