The evaporative cooling system worked when i did the final handover inspection. Jul 01, 2005 cooling water users, armed with a basic knowledge of proper cooling water management, can avoid many of the problems resulting from corrosion, scale, deposition and biological fouling. Many households use conventional cooling systems as a backup to their evaporative cooling systems during these periods. Vapour compression refrigeration systems involve high energy consumptions and. Suited for virtually all geographic locations, the coolair evaporative cooling system. Pdf effect of water flow rate on cooling effectiveness. Types of evaporative coolers direct evaporative coolers use a fan to pull outside air through media pads that are kept. The systems design was based upon the humidifying capacity of an ultrasonic humidifier supplied by a quebec company, plastique frapa inc.
United states general services administration gsa region 8. Evaporative cooling, effectiveness, performance, energy saving. Pdf evaluation of evaporative cooling systems in industrial. The theory of direct evaporative cooling owes much to dr. It is not only uncomfortable to work in, but it can be downright dangerous for the welfare of your workers.
Choosing an evaporative cooling system offers a substantial energy cost savings. Installing an evaporative cooling system is an alternative method of using an air conditioning system that pumps refrigerant through compression and evaporative cycles. Indirect evaporative cooling can be used to lower both the dry bulb and wet bulb temperatures. Thalackottore jose department of engineering and design school of engineering and informatics university of sussex, falmer, brighton, bn1 9qt, uk. When warm, dry unsaturated air is pulled through a watersoaked pad, water is evaporated and is absorbed as water vapor into the air. Using a control system to minimise energy usage of fans coupled with evaporative cooling, relatively low flow rates of air are required. However, tenants have recently started using evaporative cooler and complained it did not work. Evaporative cooling is a method of converting hot air into a cool breeze using the process of evaporating water. There are two essential requirements for evaporative cooling.
The principle underlying evaporative cooling is the fact that water must have heat applied to it to change from a liquid to a vapor. Provide manual reset control for motors rated greater than 34 kw one hp. The concept of indirect evaporative cooling ijesit. Evaporative cooling design guidelines cedengineering. Evaporative cooling pads that are saturated with water, a substantial cooling effect is realized due to the evaporation of that water. Evaporative cooling systems bim object definition from nbs. Evaporative cooling differs from typical air conditioning systems, which use vaporcompression or absorption refrigeration cycles. Evaporative cooling is a reliable, lowtech method to provide cooler air during hot weather. Concept of evaporative cooling evaporative cooling is the process by which the temperature of a substance is reduced due to the cooling effect from the evaporation of water. Pescod, a heat exchanger for e nergy saving in an airconditioning. The design will depend on the materials available and the users requirements. The rate of evaporative cooling is a function of both humidity and air movement. One must know them to understand the operation of evaporative coolers.
An evaporative cooling systems typically comprises of items such as external louvres, evaporative cooling unit and water connections. In summary, evaporative cooling is the process of removing heat from a surface due to the evaporation of water. There are two basic types of evaporative air coolers eacs. When air passes through porous wet media, some amount of water evaporates and reduces the air temperature. Evaporative cooling food and agriculture organization of. In this paper various types of direct and indirect. Water can absorb a lot of heat without changing phases, allowing it to remove heat. Evaporative cooling design guidelines manual iv this report by nrg engineering is funded by the new mexico energy minerals and natural resources department, 1220. Evaporative air cooling provides the most energy efficient temperature relief for commercial or industrial environments of any scale. The main disadvantage of this kind of particular cooling is that it is only applicable in dry atmospheres.
It is not successful in the areas where the dampness is high. The basic design consists of a storage pot placed inside a bigger pot that holds water. Cool boss uses the direct cooling method, so its arguably one of the most costeffective air coolers available. The above photo shows the multistage indirect evaporative cooling units installed at the national. The process is indicated in the psychrometric chart below. Spray humidifiers deliver moisture to an atmosphere using either high pressure or compressed air to ensure evaporation. Yet the commercially dominant cooling systems are intensively powerconsuming ones, i. It is used in data center and large it facilities to provide air cooling conditioning services.
Performance evaluation of alternative evaporative cooling media. The nsidc provides data for studying the cryospherethose areas of the planet. Whether youre looking for a portable evaporative air cooler a. Direct air evaporative cooling for buildings and areas that do not have a central air conditioning system, direct air evaporative cooling can be a very economical and achievable way to reduce the temperature. Principles and application of evaporative cooling systems for. When evaporation occurs, this heat is taken from the water that remains in the liquid state, resulting in a cooler liquid.
The primary objective of the project was to demonstrate the capabilities of a new. Peak summer hour electricity and water costs were calculated to compare equivalent cooling costs applicable to a 2600 square foot area portable classroom. The basics of cooling water management 20050701 process. His theory of adiabatic saturation and the standard psychrometric chart are its roots. The concept of evaporative cooling came from the sweating of our bodies. Course contents evaporative coolers, often called swamp coolers, are cooling systems that use only water and a blower to circulate air. However, buildings electricity bills have become unaffordable. Before the estcp project, a federal energy management program report was.
Evaporative cooler engineering specification 598 1. The temperature of saturated moist air approaches nearly the. Water evaporates and the air temperature decreases. Multistaged indirect evaporative cooler evaluation gsa. Pot designs these are simple designs of evaporative coolers that can be used in the home. Indirect evaporative coolers can be utilized to cool air or other fluid with wet surface heat exchangers. Furnish proof satisfactory to the owner or his representative, of. Energy efficient evaporative air cooling systems free. Installation and maintenance of evaporative cooling system. Duan, zhiyin 2011 investigation of a novel dew point. The best time to measure wet bulb temperature to calculate the potential cooling performance of the evaporative cooling system is in the afternoon. Evaporative cooler an overview sciencedirect topics. Evaporative cooling systems use the same principle as perspiration to provide cooling for.
Evaporative cooling design guidelines pdh courses online. There are several types of evaporative coolers including the following. Extreme heat and humidity can, and frequently does, cause heat strokes. Jul 02, 2014 drawbacks of evaporating cooling system. Evaporative cooler types evaporative coolers cool boss. This online engineering pdh course discusses some of the pertinent design issues and guidelines for evaporative cooling systems. Used in conjunction with coolair fans, a temperature reduction of 1025 degrees is commonplace. Typically a 1kw evaporative cooling system can manage a 20kw load. The direct evaporative cooling process in a psychrometric chart air at with dry bulb temperature 70 o f and relative moisture 60% state a is cooled down state b by evaporating water. Fan and pad greenhouse evaporative cooling systems 2 frequently drift out of calibration and should be checked against standards on a regular basis. Evaporative cooling design guidelines manual iii evaporative cooling design guidelines manual for new mexico schools and commercial buildings principal investigator. Generally, an evaporative cooler is made of a porous material that is fed with water. International journal of engineering research and general. 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.
Jigawa state polytechnic collage of business and management studies. At the point when considering evaporative cooling, one ought to figure out the wet knob and dry globule temperatures of the region. 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. Evaporative cooling is also known as swamp cooling, desert cooling and wet air cooling. Evaporative cooling is a type of environment cooling techniques that cools the surrounding air using water evaporation technique. Some examples of evaporative cooling designs are described below. A small, selfcontained pad and fan evaporative cooling system with a 1. This evaporative cooling design guidelines manual for new mexico schools and commercial. Evaporative cooling design guidelines manual iv this report by nrg engineering is funded by the new mexico energy minerals and natural resources department, 1220 south st. Anyone who has spent some time in a hot, stuffy warehouse understands how torturous heat and humidity can be.
Many industrial processes require that heat be moved from one place to another. The conversion of sensible heat to latent heat causes a decrease in the ambient temperature as water is evaporated providing useful cooling. Cooling is provided whilst keeping the evaporative process outside, which avoids elevating the indoor humidity level. Evaporative cooling design guidelines ced engineering. The cost of an evaporative cooling system may be higher than a vaporcompression chiller system, but payback is typically six month to five years depending on climate. It will consist of the component parts as listed in the following sections. Anil dube at sandip institute of engineering and management nashik. The efficiency of evaporative cooling system is directly affected by wbt. Evaluation of evaporative cooling systems in industrial buildings article pdf available in international journal of heat and technology 333. Evaporative cooling or adiabatic cooling or evaporative adiabatic cooling in the context with data center cooling describes all the same. Leadership in energy and environmental design leed points can be achieved by using cooling options that operate more ef. Aquacool evaporative cooling systems are the most durable, dependable and easytouse systems on the market today. The only significant energy use is in the fan for the air movement.
When sweat evaporates from the skin, a large amount of heat is required. Indirect evaporative cooling heat and mass transfer research heat and mass exchanger effectiveness energy ef. The cooling energy requirements are certainly a key issue in warm climates. The evaporative cooling module shall be selfcontained. What are the advantages and disadvantages of evaporative cooling. 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.
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. There are many different styles of evaporative coolers. The evaporative cooling performance pends on characteristics of pad, mass flow rate of airde. This paper was part of a senior year design project and reports the results of.