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Good sources of info for "low-energy" building and maintenance work?
Anna Kettle wrote:
On 26 Dec 2006 07:01:49 -0800, wrote: To kick off... insulation insulation insulation solar hw can pay back but too often doesnt. solar warm air can give good ROI underground pipes can give a nice return as an ac substitute solar pv forget it windgens in inhabited areas forget it shower drain heat exchanger can pay back well passive cooling avoids much ac deciduous climber on house walls producng fruit gives summer colling & food, but must be kept off the roof. High ROI. CFLs god ROI Thats an interesting list and I'm glad to see that I have all the sensible ones installed or planned, except a shower-drain heat exchanger, which is a new one on me. Can you elaborate? Anna Sure. In a diy incarnation its a piece of metal waste pipe with microbore wrapped round it. The 4 lengths of microbore wrapped in parallel connect to a 4 way manifold at each end. The idea is as the warm shower waste water flows one way, the cold feed to the shower flows the other way thru the 4 microbores. This makes a crossflow heat exchanger, giving you a lukewarm cold feed to the shower and thus reducing hot water use. In the right situations they can give over 50% ROI, but in Britain they will generally be nonideal implementations, but still be a good long term investment when fitting a bathroom. NT |
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