Roger Millin wrote: > Ron said: >> I would use any such calculations with care. The "U" value of a >> normal brick wall will not be the same as a boat. > snipped > > Yep, that's why I said it was a bit of a bodge. It must get closer > than guessing though and with some nouse applied to adapting the > figures could give an approximation. > Roger
It could be made into a nice spreadsheet - if someone can suggest some heat transfer values.... The factors that are needed to make a good model are 1. Actual Minimum Outside Temperature (for some reason most models use -1C - I suppose they think that we can tolerate a few cold nights!) 2. Desired Inside Temp in each room 3. Outside wall area of each room and U value 4. Wall areas between rooms and U value 5. Window area and U values (this is always a *major* heat loss componant, especially with single glazing) For a boat No.3 would need some adjustment as to the part that is water wetted, and would include floor and ceiling areas as well. Also for a boat we must consider all the high and low vents that are required by the BSS, that will cause a proportion of warm air to be lost and replaced by cold... Ron Jones Process Safety & Development Specialist Don't repeat history, unreported chemical lab/plant near misses at http://www.crhf.org.uk Only two things are certain: The universe and human stupidity; and I'm not certain about the universe. ~ Albert Einstein
