Thiet ke noi that

Neu Thiet ke noi that nha hang co phong may hoac phong tien ich khong dieu hoa khong khi dat canh khu vuc co dieu hoa, va nhiet do trong phong tien ich cao hon khu vuc duoc dieu hoa, tim luong nhiet thu, Btu/h, tu cong thuc (dien tich phong tien ich hoac phong may, ft2) X (nhiet do bau kho phong tien ich hoac phong may, °F - nhiet do bau kho khu vuc dieu hoa, °F) X (he so truyen nhiet cua phong tien ich hoac phong may, Btu/(h.ft2.°F), tra tu bang trong Huong dan). Voi nha co san tiep xuc voi dat, hoac co tang ham khong thong hoi va khong suoi, noi chung khong co nhiet thu qua san vi nen dat thuong co nhiet do thap hon san. Khi san o tren nen dat va tiep xuc voi khong khi ben ngoai, tim luong nhiet thu, Btu/h, qua san tu cong thuc (dien tich san, ft ) X (nhiet do bau kho thiet ke ngoai troi, °F - nhiet do bau kho thiet ke trong nha, °F) X (he so truyen nhiet cua vat lieu san, Btu/h tra tu bung trong Huong dan). Neu phong tien ich hoac phong may o duoi san, dung cong thuc tuong tu nhung thay nhiet do bau kho thiet ke ben ngoai bana nhiet do bau kho cua phong tien ich hoac phong may. Doi voi san phia tren mat dat, mot so nha thiet ke giam chenh lech giua nhiet do bau kho thiet ke cua trong va ngoai nha di 5°F (-15°C) ; nhung nha thiet ke khac dung chenh lech nhiet do tuong doi cua tuong duoc che lay tu Huong dan. Ca hai cach, hoac cong thuc o tren, deu cho ket qua an toan.