#video on #cooling houses with a natural-convection earth-source PVC tube to save #energy. #HVAC
on 02025-11-25#Technology-Connections #video dissecting an “Aeocky” rotary desiccant dehumidifier, which uses red-hot heating elements, a shaded-pole fan motor for the regeneration air, and a plastic cross-current heat exchanger to regenerate the desiccant and recondense the water. The main desiccant wheel has air forced through it by a large (300mm?) BLDC-like fan. He reports that it’s much smaller than vapor-compression types, the fans only consume about 12W, but the regeneration heating element is 300W, very similar to a vapor-compression device, condensing some 100g of water per hour (11kJ/g water), about ⅕ as much as the refrigerant-based unit. A Peltier-based dehumidifier was about as efficient as the desiccant-based unit in his moist bathroom, but the desiccant-based unit was able to remove water even from the 40%-RH air of his office. Most the ones he found on amazon.co.uk in the US$170–300 range were 580–735W, 7.5–11ℓ/day, and 6–7.5kg, most being almost twice as efficient as the one he tested (≈5kJ/g water). Recommends an adsorption dehumidifier brochure from Technofrigo Tuscany (“TFT dry air solutions”). #desiccants #mechanisms #HVAC
on 02025-09-03#video promising a revolution in #air-conditioning. A lot of talking-head filler and scientific errors. The purported revolution is Magtor’s linear motor to drive a piston-pump compressor at 60Hz, purportedly 33% more efficient. #cooling #HVAC
on 02024-11-05DoE #PDF on “Coolerado” #evaporative cooler, which evaporates water in a secondary airstream. #HVAC
on 02017-03-11What #desiccant #dehumidifiers are good at. #hvac
on 02016-07-11