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Evening all, Spent the evening taping the vcl & just finished off the evening doing some heat loss calcs and the calc surprised me. Background: Ceiling u value 0.09 Walls 0.15 Glazing 1.4 Timber frame, well sealed I'd say. Floor area 16m2 with volume of 41m3 (it is a high ceiling) MVHR. My calc suggests fabric heat loss of 180watts with the ventilation losses of 620watts. I assumed 2 airchanges an hour with -1 outside and 21 target, these two factors are responsible for the ventilation heat losses so are they reasonable assumptions? The calcs work out at a heat loss of 51w/m2 of floor area. I'm being rather ocd with taping etc so I'm hoping for a good airtest so if I achieve between 1 and 2 air changes an hour. I havent allowed for the mvhr or any heat rising from below (floors will have sound insulation which will reduce the heat rising from below). So do I need to suck it up or are some of my assumptions out? Thanks, CC
