This post documents my first test of using a car radiator combined with a large storage tank to provide high COP cooling. I've been off my blog for a few months with moving back to oz, doing various house repairs and job hunting.
I assembled a cobbled together airconditioning system using a car radiator and a water loop from the fish tank. It works, although it's not tremendously effective. I am not sure why. I am using the 240V fan I was planning to use for the ceiling rather than the built in fans (can't find a power supply). The water coming out is distinctly warmer than the tank water (and would be warm enough for a tepid bath, so it's probably in the high 20s) so there is plenty of heat transfer. It might be as simple as using a few more radiators or using the proper fans. The next step will be sourcing a suitable power supply for the built in fans and adding some measuring equipment.
I say it's not tremendously effective and that might be more because we are used to getting an icy blast of air from aircons, rather than a large volume of cool air. Without proper measurement we shouldn't jump to conclusions either way. So to this end I will wire up some temp sensors, and use the humidity sensor Nick bought me to determine overall effect.
I'll also go and buy a few more radiators and park them around the house to see whether we can get enough cooling to make this a workable scheme. I'm also wondering whether some kind of evaporative process could be combined to bring the temp closer to the dew point (currently 12C), perhaps evaporating outside through a radiator before entering the building and being used to chill the air. I fear that so many layers would have a poor efficiency, but then again, I'm using only a few hundred watts compared with many kilowatts in a traditional refrigerative system, or even the half kilowatt my father's evap system uses.