Cooling air temperatures that can be achieved by a direct evaporative
Home Cooling Systems Evaporative Coolers In low-humidity areas, evaporating water into the air provides a natural and energy-efficient means of cooling. Evaporative coolers, also called swamp coolers, rely on this principle.
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If the direct evaporative process were 100% efficient, the leaving dry-bulb temperature would equal the entering wet-bulb temperature. The efficiency of the direct evaporative process is less than 100% and by defining saturation efficiency (ese) for the direct stage or evaporative pad, the leaving dry-bulb temperature can be expressed by the following equation.
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Evaporative Cooler Chart (Temperature, Humidity & Efficiency) July 22, 2022 | Rene Langer Reviewed by James Brennan Evaporative coolers cool air through evaporation, as the name of course implies. In drier air, an evaporative cooler is able to lower the air temperature more effectively than when the air is humid.
Evaporative Cooler Process on Psychometric Chart. where η = Efficiency
Evaporative coolers, sometimes referred to as swamp coolers, are devices that harness the natural process of evaporation to cool spaces efficiently and cost-effectively. To do this, units draw in warm air, forcing it through several damp membranes, absorbing heat and emitting cooler air in the process.
difference the evaporativeaircooler (EAC) and
If the direct evaporative process were 100% efficient, the leaving dry-bulb temperature would equal the entering wet-bulb temperature. The efficiency of the direct evaporative process is less than 100% and by defining saturation efficiency (ε s e) for the direct stage or evaporative pad, the leaving dry-bulb temperature can be expressed by the following equation.
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Evaporative coolers — commonly known as "swamp coolers" but also called evaporative air conditioners, desert coolers, wet air coolers and even swamp boxes — have been around in their modern form since the 1930s.But the basic concept can be traced to the ancient Egyptians, who discovered hot, dry breezes could be made pleasantly cool and moist when blown through damp reed mats, or past.
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across the cooling media is 27ºF (as in the above example), the cooling efficiency is 90%. (27/30 = .90). 4) Evaporative Cooling Performance Factors: The evaporative cooler performance is directly related to its ability to evaporate water (cool) at a given relative humidity. The dryer the air, the greater shall be the performance.
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An evaporative cooler, also known as a swamp cooler, takes advantage of the cooling effect of evaporating water in the same way the human body does when it sweats.
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Evaporative coolers are least effective in lower temperature (below 75°F) and high humidity (above 60% relative humidity) situations. The swamp cooler humidity chart spans from 75°F to 125°F temperature and from 2% to 80% relative humidity levels. It tells you at which temperatures and moisture levels using an evaporative cooler is effective.
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[1] The evaporative cooler was the subject of numerous US patents in the 20th century; many of these, starting in 1906, [2] suggested or assumed the use of excelsior (wood wool) pads as the elements to bring a large volume of water in contact with moving air to allow evaporation to occur.
How Efficient Is an Evaporative Cooler? (Chart and How it Works)
The Efficiency Chart First, you need to understand that, like temperature, humidity can and will change from day to day. That's why it's best to have a whole chart that can be used to cover all possible humidity levels and temperatures possible. That's the evaporative cooler humidity chart.
How Efficient Is an Evaporative Cooler? (Chart and How it Works)
Install an evaporative cooler to provide efficient cooling in a dry climate: Determine if evaporative cooling is an appropriate option for your location based on cooling design wet-bulb temperatures. Determine the approximate air changes per hour (ACH) needed to adequately cool your home based on local climate and manufacturer guidelines.
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The saturation efficiency of the direct evaporative cooler is a function of the pad geometry and airflow rate. The pad geometry is constant throughout the simulation, but the airflow rate can change from hour to hour when the evaporative cooler is used with an air economizer.
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Cooling Processes in the Psychrometric Chart. The cooling processes in the Psychrometric Chart are shown below:. If we say that the evaporative cooler is 90% efficient, the process will take place along a constant wet bulb temperature line for 90% of the distance from point "A" to the saturation line (100% relative humidity)..
How Efficient Is an Evaporative Cooler? (Chart and How it Works)
Evaporative Cooler Output Temperature Look-Up. Fahrenheit: Humidity% 5: 10: 15: 20: 25: 30: 35: 40: 45: 50: 55: 60: 65: 70: 75: 80: Example: 96°F and humidity 35% results in an output of 78°F: A I R T E M P E R A T U R E:
How Efficient Is an Evaporative Cooler? (Chart and How it Works)
The Wet Bulb Depression is the maximum amount of cooling achievable with a 100% efficient evaporative cooler system. 3) Humidity Humidity, which is expressed by the water vapor pressure in air, is.
