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--- hvac:swamp_cooler [2019/05/27 15:38]
frater_secessus [portable units]
+++ hvac:swamp_cooler [2023/05/24 17:10] (current)
frater_secessus [portable units] added further reading section
@@ Line 2: / Line 2: @@
 [[http://amzn.to/2Diz4nm|{{ https://images-na.ssl-images-amazon.com/images/I/41V5c1TuNkL._AC_US218_.jpg?200}}]]
-Evaporative coolers, sometimes called //swamp coolers//, are an option in areas with low humidity.  They do not cool by a certain number of degrees, but rather [[https://en.wikipedia.org/wiki/Evaporative_cooler#Applications|output air ~5-7F]] above [[https://phoenixmanufacturing.com/calculators/evaporative-cooling-sizing-calculator/|wet bulb thermometer]] reading.  Standard sizing is cooler cfm = cubic feet of area / 2.((https://phoenixmanufacturing.com/calculators/evaporative-cooling-sizing-calculator/))
+Evaporative coolers, sometimes called //swamp coolers//, are an option in areas with low humidity.  They do not cool by a certain number of degrees, but rather [[https://en.wikipedia.org/wiki/Evaporative_cooler#Applications|output air ~5-7F]] above [[https://phoenixmanufacturing.com/calculators/evaporative-cooling-sizing-calculator/|wet bulb thermometer]] reading.
-Water consumption for a van-sized space is about 1 quart/hour of cooling.((http://www.cheaprvliving.com/forums/showthread.php?tid=28601&pid=360091#pid360091))
+Standard sizing is cooler cfm = cubic feet of area / 2.
+((https://phoenixmanufacturing.com/calculators/evaporative-cooling-sizing-calculator/))
+Example: a long wheelbase, high roof transit is 411 cubic feet.  Theoretically that would be 205.5cfm, but additional challenges of vanlife (direct sun, less insulation) make 411cfm a safer bet. For purposes of numbers only, [[https://amzn.to/2WrUzPA|a unit with those specs]] would cost $300 and use 150w of power on HIGH.  [[https://amzn.to/2Q0ppbe|A smaller spot cooler]] might be 150cfm, $100, and use 50w.
-The main manufacturer of RV swamp coolers is [[https://turbokool.com/|Turbokool]].
+Concerning water consumption (Working backwards from residential numbers), it takes about 7gals/hour for 1500sq ft house.  For a 50sq ft van like an American low-roof, that would be .23gal/hour.  So ~2 gallons for 8hrs of cooling, ~4 gallons for 16 hours, and ~6 gallons every 24 hours.((http://www.cheaprvliving.com/forums/showthread.php?tid=28601&pid=360091#pid360091))  Our Transit example might consume 1.5x those amounts.
+>The amount of water the evaporative cooling pads will use is primarily dependent upon three factors: outside temperature, outside humidity and the amount of air being drawn through the evaporative cooling pads. -- ([[https://www.poultryventilation.com/system/tdf/vol29n1.pdf?file=1&type=node&id=4976&force=|pdf]])
+Evaporating a gallon of water pulls about 8,700BTU from the air.((http://www.emnrd.state.nm.us/ECMD/Multimedia/documents/EvapCoolingDesignManual.pdf)).
+Manufacturers:
+  * [[https://turbokool.com/|Turbokool]]
+  * [[http://www.fresair.com/|Fresair]]
 ===== portable units =====
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 Units with electronic controls should be run off [[electrical:inverter|pure sine wave inverters]].
+===== further reading =====
+  * [[https://tiremeetsroad.com/2020/09/19/how-those-thermador-car-swamp-coolers-on-classic-cars-work/|Thermador swamp coolers]] that used to be mounted to car windows

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