Air Flow Through Duct With Electric Heater Temp Change Sizing the Exhaust Fan and Evaporative Cooler in Dry Cleaning Plants

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Sizing the Exhaust Fan and Evaporative Cooler in Dry Cleaning Plants

Almost every dry cleaner uses evaporative coolers, or swamp coolers as some call them, in their plants or clothing cleaning areas. Using refrigerated air conditioning will be too expensive for them. Their steam boilers are putting hundreds of thousands of BTUs of heat into the work area. Using air conditioning to remove this much heat would cost thousands of dollars a month. Because of this, the dry cleaner’s work area should have an exhaust fan capable of complete air exchange every 1 1/2 minutes. Let me give you an example to help you find the right size exhaust fan for your cleaner.

Suppose you lease a space 25 feet wide by 80 feet deep in a shopping center. The total square footage of this lease space is 2,000 square feet. Usually the front sales area is heated and air-conditioned. Further, 2,000 sq. Subtract your sales area of ​​25 feet wide and 15 feet deep from the feet which gives a total of 375 sq. is ft. This gives you 1,625 sq. ft. The boiler room is 10 ft by 10 ft (100 sq. ft) and the toilet room is 6 ft by 6 ft (36 sq. ft) for a total of another 136 sq ft. Generally not found in colder areas. .. This gives you 1,489 square feet of floor space in the work area for exhausting and cooling. To get the cubic feet of the work area, we must measure from the floor to the roof deck. I say roof deck because I do not recommend installing a ceiling in the work area. This keeps the heat in the room low and the work area overheats. Multiply the 1,489 square feet from the floor to the roof deck by 15 feet and you get a total of 22,335 cubic feet. Divide 22,335 by 1 ½ (the amount of air change per minute) and get the total number of cubic feet of air to remove each minute, or CFM. In this situation, I would install an exhaust fan rated at about 15,000 CFM. The most common exhaust fans used in dry cleaners are Granger fans. Granger stores are located in most major cities in the United States, making it convenient to purchase fans and parts. I have bought exhaust fans from Granger for years. I learned a way that any Granger customer, even if you’ve never bought from them before, can get 10% off their fans. If you e-mail me I will tell you how you can get a discount at any Granger store in the country.

Next, you need to prepare the exhaust air with an evaporative cooler. These work best in dry climate areas. But they also provide some cooling in more humid areas. You may only get a 10 degree temperature drop in a humid area, but on a 95 degree day, an 85 degree breeze may feel good when working on a hot press. At dry cleaner plants you will usually find them using large commercial evaporative coolers. For the scope I charged above you would need to install a 15,000 CFM cooler. Remember when you look at coolers, they usually give a CFM rating for open air. You probably have a duct system that cools the work area, so there is a constant pressure or restriction on the flow of air through the cooler. If you are using a 15,000 to 16,000 CFM evaporative cooler, you will probably be a better match with a 15,000 CFM exhaust fan. Ductwork static pressure will generally reduce the CFM rating by a couple thousand CFM. The reason this match is good is because you want a little negative pressure in the work area, in other words, a little more air coming out of the room than the room is supplying. The most common evaporative coolers used in dry cleaning work areas are the Champion 14/21 SD or the Essick 14/21 SD. These are the most common because they are the cheapest models sold. If you are willing to spend a little more money, I recommend going for a cooler that will last longer. Champion AS150 or Champion AS15012 are well built and long lasting coolers. If you want a better explanation of why they are good coolers, you can type this cooler into a search engine and find articles written about them.

I know there is a lot of technical information that many people will find boring, but if you want to cool a dry cleaning plant, I highly recommend using this information. I have installed exhaust and cooling systems at cleaners in the Dallas/Fort Worth, Texas area for decades. These formulas and tools work great. I hope these tips I learned will help others in the future.

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