Sizing a heating and cooling system
We are finalizing designs for the mechanicals and I am looking for some advice. My mechanical engineer is doing all the Manual J, D, S, and HERS calculations. On my side, I am running the WUFI analysis. We are going to spec a combination of ducted, non-ducted units working off of a single VRF ASHP. Some of the questions I have are as follows:
1) Does anyone have any experience with regards to which sizing tool is more accurate in a very well insulated house, Manual J or WUFI?;
2) What size should the system be relative to the size specified above? I don’t want to spec something too small that runs all the time or something too big that cycles on and off. My gut is to spec something that is designed to operate at the size chosen in 1, but has the ability to operate at 25% greater than that.
3) All of the anecdotal information I have seen is that Fujitsu is a great product, if not the best, thoughts?
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