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. Department of energy building america program through the midwest research institute national renewable energy laboratory division n. The cooled air is circulated by a blower direct evaporative cooling adds moisture to the air stream until the air stream is close to saturation. In this paper different cooling pads have been studied. Evaporative cooling differs from typical air conditioning systems, which use vaporcompression or absorption refrigeration cycles. Nonresidential evaporative air cooling systems airah. For steam humidifiers, this energy typically comes from the electricity or gas being used to boil the water.
Energy efficient evaporative air cooling systems free. Many households use conventional cooling systems as a backup to their evaporative cooling systems during these periods. Evaporative cooling occurs when air, that is not too humid, passes over a wet. An evaporative cooler is a device that cools air through the evaporation of water.
Evaporative cooling as an efficient system in mediterranean region. To evaporate 1kg of water into an atmosphere, 680w of energy is required. Data centre cooling requirements data centre cooling systems represent a significant portion of a facilitys capital expenditure and use a substantial amount of energy. Home inspectors should keep this in mind when inspecting evaporative cooling systems. There are two basic types of evaporative air coolers eacs used to cool new mexico schools and commercial buildings, direct. The maintenance of a water system in a clean state is an important part of. Performance evaluation of alternative evaporative cooling.
The basic structure of the cooling chamber can be built from bricks and river sand, with a cover made from cane or other plant material and sacks or cloth. Pdf airconditioning plays an essential role in ensuring occupants thermal comfort. The design will depend on the materials available and. Evaporative cooling, effectiveness, performance, energy saving. Ventilation systems can provide comfort cooling for most of the year. This manual is also intended as an overview of evaporative cooling principles and equipment for the nontechnical reader, with technical terms shown in bold print and defined in the glossary. This system is the oldest and the simplest type of evaporative cooling in which the outdoor air is brought into direct contact with water, i. For example, while some people mind the additional ventilation required, others enjoy opening their home up to natural light and fresh air.
Three different types of evaporative cooling pads were used, namely. 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. 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. Evaporative cooling is a reliable, lowtech method to provide cooler air during hot weather. However, buildings electricity bills have become unaffordable. Course contents evaporative coolers, often called swamp coolers, are cooling systems that use only water and a blower to circulate air. Study on dew point evaporative cooling system with counter. Yet the commercially dominant cooling systems are intensively powerconsuming ones, i. When warm, dry unsaturated air is pulled through a watersoaked pad, water is evaporated and is absorbed as water vapor into the air. Performance evaluation of alternative evaporative cooling media. Evaporative cooling concept to counter periods of extreme temperature that affect inhouse environments and therefore production, coolair evaporative cooling pad systems are used with outstanding success.
This is a pdf file of an unedited manuscript that has been accepted for publication. The thermometer on the left is a common thermometer used to measure drybulb temperature. What are the advantages and disadvantages to evaporative cooling. Evaporative coolers, often called swamp coolers, are cooling systems that use only water and a blower to circulate air. Evaporative cooling design guidelines manual for new mexico schools and. The evaporative cooler was tested and evaluated using tomato roma. When warm, dry unsaturated air is pulled through a water soaked pad, water is evaporated and is absorbed as water vapor into the air. Published on november 4, 2015 november 4, 2015 91 likes 26 comments. Memory and chipset cooling units are either separate heatsink devices with accessory fans or integrated heatsinkfan devices. Ashrae american society of heating, refrigerating, and airconditioning engineers publishes specific guidelines for temperature and humidity control within data centres. The main disadvantage of this kind of particular cooling is that it is only applicable in dry atmospheres.
Rather than an energyhungry compressor used by mechanical refrigeration systems, an evaporative cooling system only needs a simple fan to move the air and a basic water pump to keep the pads wet. Extreme heat and humidity can, and frequently does, cause heat strokes. Evaporative cooling efficiency is the most compelling advantage to this technique. Evaporative cooling food and agriculture organization of. There are many different ways to set up an industrial cooling system, but the three basic types can be summarized by examining how cooling water is used in each system. However, the term evaporative cooling refers to the cooling obtained solely by the evaporation of water in air. Is evaporative cooling efficiency up to data center standards. Publications iv publications xudong zhao, zhiyin duan, changhong zhan, 2009, dynamic performance of a novel dew point air conditioning for the uk buildings. The evaporative cooling module shall be selfcontained. Evaporative cooler types evaporative coolers cool boss. Evaporative air and coolers can be classified as direct. The system s design was based upon the humidifying capacity of an ultrasonic humidifier supplied by a quebec company, plastique frapa inc.
Hence, evaporative cooling technology has gained much attention in air conditioning application. Theoretical performance analysis of direct evaporative cooler in hot and dry climates ibrahim u. International journal of engineering research and general. Ali abstract this paper present the cltd method for calculating the sensible cooling load estimation for evaporative cooling systems as a replacement of high power. Despite the drawbacks listed above, evaporative cooling can still be a great solution for many homesdepending on your specific preferences. It is not successful in the areas where the dampness is high. In the last 10 years, evaporative and desiccant cooling technology for air. Abstract evaporative cooling is an energy efficient and environmentally friendly air conditioning technology. The systems design was based upon the humidifying capacity of an ultrasonic humidifier supplied by a quebec company, plastique frapa inc. When evaporative processes are used to cool an element of the building, which then acts as a heat sink, this is known as indirect evaporative cooling. The temperature difference between the drybulb thermometer and wetbulb thermometer is dependent on the amount of water vapor in the ambient air. Installing an evaporative cooling system is an alternative method of using an air conditioning system that pumps refrigerant through compression and evaporative cycles. When large quantities of air are pulled through evaporative cooling pads that are saturated with water, a substantial cooling effect.
They are one among other cooling units on desktop, laptop and notebook computer motherboards, and attached to voltageregulated modules to prevent circuitry overheating or melting. Jun 09, 2016 there are two types of evaporative cooling. Pdf design and construction of an evaporative cooling. Ashrae american society of heating, refrigerating, and airconditioning engineers publishes specifi c guidelines for temperature and humidity control within data centres. Jul 02, 2014 drawbacks of evaporating cooling system. Furnish proof satisfactory to the owner or his representative, of. Efficient cellular water media can achieve temperature reductions up to 20 degrees depending on temperature and humidity conditions. Evaporative cooling ec, also known as swamp cooling, is a strategy for cooling air that takes advantage of the drop in temperature that occurs when water thats exposed to moving air begins to vaporize and change to gas. Evaporative air cooling provides the most energy efficient temperature relief for commercial or industrial environments of any scale. Direct and indirect evaporative cooling strategies.
Many cooling applications use water as a medium to absorb heat, because water has a high boiling point and high specific heat. It will consist of the component parts as listed in the following sections. System type mechanical vapour compression absorptionadsorption evaporative cooling features dominate the air conditioning market mature technology with stable performance and low cost. On the other hand, the indirect cooling method allows industrial spaces, restaurants or other businesses to cool their spaces to temperatures that are lower than those offered by portable swamp coolers like cool boss. This study is performed in summer and based on weather conditionof bhopal, india. It is at this point that evaporative cooling is brought in. Direct indirect with direct evaporative cooling, outside air is blown through a watersaturated medium usually cellulose and cooled by evaporation. Youve probably experienced the effects of evaporative cooling if youve. All evaporative cooler types have one thing in common. Summary the evaporative cooling technique is an efficient approach. Direct evaporative cooling systems is a technology which involves adiabatic humidification and cooling of air with supplementary heat exchange facilities to lower final air temperature and try to reduce relative humidity.
It is not only uncomfortable to work in, but it can be downright dangerous for the welfare of your workers. Duan, zhiyin 2011 investigation of a novel dew point. Furthermore, once indirect evaporative airconditioning in 500,000. The climate of jordan is predominantly of the mediterranean type. What is data center evaporative cooling swamp cooling. Performance evaluation of three different types of local. At the point when considering evaporative cooling, one ought to figure out the wet knob and dry globule temperatures of the region. So, evaporative cooling systems that use adsorption pre dehumidification.
Hence, preserving these types of foods in their fresh form demands that the chemical, bio. The equipment operates on the principle of evaporative cooling and increasing the relative hu midity rh in the preservation chamber. Evaporative cooling is based on the thermodynamics of evaporation of water, i. Depending on the type and concentration of minerals, possible safety hazards. Performance evaluation and comparison of multistage indirect. Three types of cooling pad made of a cellulose, aspen fiber, and coconut coir were comparatively studied. Furthermore, no chemical refrigerant is used in evaporative cooling systems and they are deemed as environmentally friendly. Investigation of a novel dew point indirect evaporative air conditioning system for buildings by zhiyin duan thesis submitted to the university of nottingham. Data centre cooling requirements data centre cooling systems represent a signifi cant portion of a facilitys capital expenditure and use a substantial amount of energy. This manual is intended to be used as a tool for the design of successful and efficient evaporative cooling systems and will allow engineers to specify and design evaporative cooling systems with confidence.
Its material is chemically impregnated with special compounds to prevent rot and ensure a long service life. An evaporative and desiccant cooling system for air conditioning in. Evaporative cooling system for storage of fruits and vegetables a. During prolonged periods of high temperatures they are unable to maintain internal temperatures below 25c. Pros reduce peak cooling demand for both evaporative cooling less energy by 14 over an ac system installation costs can be less than or equal to ac systems better air quality humidity control available with indirect equipment it is simple technology evaporative condensing. The control of legionella bacteria in evaporative cooling systems pdf. Types of evaporative coolers direct evaporative coolers use a fan to pull outside air through media pads that are kept.
Pdf a solar powered evaporative cooling system of 0. Evaporative cooling design guidelines ced engineering. An emerging solution for homes in hot dry climates with modest cooling loads prepared for u. Anyone who has spent some time in a hot, stuffy warehouse understands how torturous heat and humidity can be. 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. Up to 80% more economical than conventional air conditioning systems, our awardwinning evaporative cooling systems have delivered proven cost reductions and operational returns throughout the manufacturing, food and beverage, it, retail, health and education. For a typical evaporative cooling device, the cop in terms of electrical power can be as high as 1520. Komfort kooler natural evaporative cooling systems komfort kooler systems utilize the natural cooling effect of evaporation to combat seasonal dips in production caused by heat stress. Evaporative cooler engineering specification 598 1. Evaporative cooling practical action 3 any part of the country using locally available materials. Cooling is provided whilst keeping the evaporative process outside, which avoids elevating the indoor humidity level. What are the advantages and disadvantages of evaporative cooling. Evaporative cooling differs from typical air conditioning systems, which use. There are many different styles of evaporative coolers.