The concept of evaporative cooling came from the sweating of our bodies. 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. Biggest problem facing the indirect evaporative cooling iec technology lies in its high level of dependency to ambient air condition. The air supplied into a conditioned room by the main supply fan is called the primary air stream.
Indirect evaporative cooling aolan evaporative air cooler. These high capacity units come in 24 cataloged formations and range in size from 6,000 cfm to over 100,000 cfm. 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. In hot humid climates with a high relative humidity, the air becomes fully saturated reducing the effect of evaporative cooling. Evaporative cooling, on the other hand, relies instead on the inherent quality of water to absorb heat when it evaporates changes from a liquid to a gas. During the majority of annual operating hours cooling of data center air is done by transferring heat to the scavenger air stream while passing through a coated aluminum heat exchanger. Introduction the evaporative cooling ec technology is based on heat and mass transfer between air and cooling water. The liebert indirect evaporative freecooling unit achieves higher efficiency through economization without the risks of bringing outside air into the data center.
Thus no water loss is associated with the cooling process. The concept of indirect evaporative cooling ijesit. Evaporative cooling solutions, fanair, celair, indirectdirect. Ecocooling products are based on direct fresh air cooling. Primary air is cooled sensibly with a heat exchanger, while the secondary air carries away the heat energy from the primary air as generated vapor. Indirect evaporative coolers iec are components that can be effectively installed in air handling units to increase energy efficiency of air conditioning systems. Evaporative cooling is based on the thermodynamics of evaporation of water, i. The main difference with an indirect system is that a heat exchanger is used to cool the air supplied to the living space. Adding a direct evaporative stage to the indirect cooling process causes further reduction in drybulb temperature.
Course contents evaporative coolers, often called swamp coolers, are cooling systems that use only water and a blower to circulate air. A national renewable energy laboratory assessment of indirect evaporative coolers found that the technology reduced energy use while maintaining thermal comfort, but it can be difficult to find favorable economic payback. Air drybulb temperature, rh, water flow rate, air velocity. Spray humidifiers deliver moisture to an atmosphere using either high pressure or compressed air to ensure evaporation. Indirect evaporative cooler westaire engineering inc. Evaporative cooling is the most energy efficient and cost effective form of cooling that exists. Custom manufacturer of indirect evaporative coolers. There are two types before we go there, you must understand humidity the humidity content decides how comfortable a person feels for ex. Ideally, these products are used in dry climates to maximize their efficiency and energy savings for.
Mechanical effect include obstruction of cooling airflow, interference with moving parts, abrasion, optical interference, interconnect interference or deformation of surfaces. Refer to figure 5 for a schematic view of an indirect evaporative cooling section located upstream of a direct eac. The main difference with an indirect system is that a heat exchanger is used to cool the air supplied to the living spa. To evaporate 1kg of water into an atmosphere, 680w of energy is required. Aolan evaporative air cooler,portable air cooler, indirect evaporative air cooler and liquid desiccant air conditioning, cooling pad manufacturer has been providing homes,factory,farm with the air,efficient water evaporative cooling system for over 20years. Indirect evaporative cooling works on the same principle as direct evaporative cooling lowering air temperature by causing water to evaporate. Fanair units are designed with an innovative and energy efficient fiveblade axial fan for low static applications and can be equipped with a forward curve fan for slightly higher static. A direct evaporative cooling system is the simplest and most popular evaporative cooling system available.
Indirect evaporative cooling pharmaceutical online. This conditioned air is supplied directly to the room with a high percentage of the room air being exhausted, rather than recirculated, to maintain a low humidity level in the room. Desiccant evaporative cooling and indirect evaporative cooling were used to increase the energy performance and reduce energy consumption. The performance data for the ing units for the month of june indicated that the units cool were not operating correctly and that the units were not providing sufficient cooling.
However, one should avoid simultaneously operating conventional air conditioners along with direct evaporative coolers. Renewable and sustainabl e energy rev iews 16, 6823 6850. It takes heat energy to change the water or any liquid from a liquid into a vapor. The second stage is handled by conventional air conditioning. Evaporative cooling solutions, fanair, celair, indirect. Over the years, we have designed systems with eers exceeding 100. Ashrae american society of heating, refrigerating, and airconditioning engineers publishes specifi c guidelines for temperature and humidity control within data centres. Evaporative cooling design guidelines ced engineering. It is strongly recommended that all it cooling systems using direct evaporative cooling be designed with a minimum of g4eu4 grade filtration at both the supply and. Energy saving potential of indirect evaporative cooler under indian. Aztec indirect and indirectdirect evaporative cooling. Dec from a to e evaporates moisture and cools the air without. When warm, dry unsaturated air is pulled through a watersoaked pad, water is evaporated and is absorbed as water vapor into the air. Humidity is added to the incoming fresh air stream, reducing its temperature whilst increasing its humidity.
An indirect evaporative cooling system passively cools the supply air by passing over a medium that has been directly evaporatively cooled on an adjacent but isolated side. Then the air is pushed into the building by the fan or blower. Mar 01, 2016 28 indirect direct evaporative cooling idec with indirect direct evaporative cooling, the primary air stream is cooled first with indirect evaporative cooling and then cooled further with direct evaporative cooling. Equipment cost is lower than a refrigeration system, installation is simple and inexpensive, and operating costs are a fraction of refrigeration systems. Indirect evaporative cooling differs from the much better known direct type because it cools air by the evaporation of water not contacting it and so does not. Munters oasis standard indirect airside economizer iase with indirect evaporative cooling iec takes advantage of evaporation to reject heat without ever adding any moisture to the data center. A heat section can be added to most models to provide a ventilation unit for year round use. The oasis product line can be configured to achieve eer over 100. 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 coolers can be employed as a compact and often the sole cooling system in a home. Evaporative cooling uses the fact that water will absorb a relatively large amount of heat in order to evaporate. The rate of evaporative cooling is a function of both humidity and air movement. Free cooling is an economical method of using low external air temperatures to reduce the.
Qatar national research fund a member of qatar foundation. Then the air continues through our direct evaporative cooler where the air is mixed with water to add a bit of moister to the air. Evaporative cooling systems perform more efficiently with reasonable cooling capacities particularly in. Indec indirect evaporative cooling unit provides cool and fresh air in the hottest of climates, with radically reduced energy costs. When sweat evaporates from the skin, a large amount of heat is required.
Performance evaluation for indirect evaporative cooling etsce7 southern california edison page iii emerging products june 2015 abbreviations and acronyms 6 cooling capacity, enthalpy flow rate e. Evaporative cooling differs from typical air conditioning systems, which use vaporcompression or absorption refrigeration cycles. Experts say that in germany approximately 10% of the roughly 25,000 new hvac systems produced each year are equipped with this environmentally friendly cooling technology, and that this trend is increasing. 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. Applied air offers direct evaporative cooling equipment with air deliveries from 3,000 cfm to 64,000 cfm and indirect or indirectdirect evaporative cooling units with air deliveries from 1,500 cfm to 37,500 cfm. 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. 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. Pdf the paper presents actual knowledge concerning the indirect evaporative cooling iec. 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. Indec indirect evaporative cooling unit armcor air solutions. Cooling is provided whilst keeping the evaporative process outside, which avoids elevating the indoor humidity level. Indirect evaporative coolers can be utilized to cool air or other fluid with wet surface heat exchangers. With oasis, the energy required to remove heat is significantly reduced. Pdf nowadays, there are a lot of ongoing research activities about cooling technologies which can lead to a significant reduction in primary.
Voiceover so if you are like most of us, your body probably sweats when it is warm, when your environment is warm, and you probably realize that it sweats in order to cool itself, in order to keep the body from overheating. Evaporative cooling capacity ranges from 6,000 cfm to over 100,000 cfm. Modeling of a regenerative indirect evaporative cooler for a desiccant cooling. Direct evaporative cooling and ventilation technologies.
First air is drawn through westaires custom heat exchanger to provide the first stage of cooling of the outside air. What is the difference between direct and indirect. 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. Try a new, improved swamp cooler green homes mother. But you probably have wondered, well, how does this work. 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. Aolan evaporative air cooler,portable air cooler,indirect evaporative air cooler and liquid desiccant air conditioning,cooling pad manufacturer has been providing homes,factory,farm with the air,efficient water evaporative cooling system for over 20years. In addition, it is possible to manufacturing this type of unit in large capacities such as central cooling systems, as. Munters systems use coolingheat rejection strategies that achieve a. The new generation indec uses a patented indirect polymer heat transfer core that delivers cool, 100% fresh outside air with very low energy consumption. Indirect evaporative cooling, regenerative cooling, dew point cooling, maisotsenko cycle, energy efficiency 1. Evaporative cooling is when your body feels cool by passing air that evaporates the water on your skin.
The use of an indirect evaporative cooling system in conjunction with a mechanical ac system o. Evaporative cooling units are also environmentally friendly as they cool efficiently without. In central hvac systems, cooling systems based on indirect evaporative cooling are becoming increasingly important. In addition, we can design the indirect evaporative heat exchanger to be used for heat recovery when ambient conditions requiring heating. The systems design was based upon the humidifying capacity of an ultrasonic humidifier supplied by a quebec company, plastique frapa inc. The whole idea is simply to prevent contamination of the water in the system and it is used in food processing. This adiabatic cooling process is also used to create the chilled water that feeds our indirect evaporative cooling coil. Adjustable sump water bleedoff valve assembly in cooling tower and direct evaporative section. You get 2 stages of evaporative cooling while offsetting substantial energy costs.
Experimental and numerical study of a heat pipe based. Direct and indirect evaporative cooling strategies. In addition, the epx heat exchanger can be configured to provide building exhaust recovery as well as indirect evaporative cooling all in one design. The dew point indirect evaporative cooling diec was developed to decrease the primary air temperature near the limit of the dew point dp temperature of the pr imary air at the inlet. The three multistaged indirect evaporative cooling units were monitored from june 1. For steam humidifiers, this energy typically comes from the electricity or gas being used to boil the water. Munters evaporative cooling solutions include direct evaporative coolers, where water is evaporated into the air stream via an engineered pad to provide adiabatic cooling, and indirect evaporative coolers, where evaporating water is used to cool the scavenger airstream passing through a heat exchanger, thus maintaining constant humidity in the treated air. By incorporating in our direct evaporative cooler with our indirect evaporative cooler you get the best of both worlds. As air is drawn through this, cascading water provides evaporative cooling, similar to an open cooling system, except that the cooled water is never allowed to make direct contact with the air. You can duplicate the principle behind direct evaporative cooling by wrapping a wet handkerchief around your neck on a hot day and standing in front of a fan. They can also be used in combination with a regular air conditioner system. These hvacs come factory assembled, prewired, and are self contained, packaged units. Another indirect cooling tower system involves a separate heat exchanger and an open cooling tower.
Stainless steel integral cooling tower with submersible type pump. Indirect evaporative cooling 2015 nova award nomination 25 air enthalpy h energy btu lb dry air is shown by left sloped line values for left to right down lines, and its value is determined by its wb. Applications include 100% outside air, and multistage systems that combine indirect evaporative cooling with dx, chilled water or direct evaporative components. A range of filtration products up to f7 eu7 grade are available. And the simple answer is its happening or whats allowing your body to cool the chemical process, i guess you could say the physical process is happening is evaporative cooling.
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