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heat load calculation-HELP
Hello to all and thanks for any input, it is greatly appreciated. I am trying to keep this as short as I can, really. I have worked in the HVACR field for almost a decade and have recently started my own company. Now that I am on my own I am encountering certain situations that, although I am familiar with the concepts, I do not have a lot of practical experience with them. For example, heat loss/gain calculations. I went to trade school and have read manual J (I think its the abridged version). I constantly encounter houses where, for example, the top floors where the attic has been finished are too hot or cold.( I understand this could be a ductwork issue I have read manual D too). Many, but not all, of the contractors I speak to say that manual J (I wont say which one) is not accurate or that it undersizes or that it has just never worked for them. I had a situation with a room is a finished attic with one radiator. I calculated BTU of radiator (from lost art of steam heating) and heat loss of room and my calculation was that the radiator was more that sufficient. I dont want to simply oversize, I wantto be able to do a proper calculation, both for myself and for the customer. I am puting is a bid for a furnace replacement and the existing is 120,000 BTU, I would like to be able to know with confidence if it is oversized.
Any advice would be greatly appreciated