Abstract
Direct gas-fired air heating will save 40 to 50% of the gas which would otherwise be required for industrial space heating. Traditionally, industrial space heating needs have been met by using indirect gas space heaters. The design differences between direct and indirect gas fired unit heaters show why there is a minimum of 40% fuel savings. The application of direct gas-fired make-up heaters for industrial space heating as well as the safety of the direct gas fired systems, a simple and accurate heating load calculation practice and a guide for proper equipment selection will be discussed.
Searcy, J. A. (1979). Direct Gas Fired Air Heating For 40 to 50% Fuel Savings. Energy Systems Laboratory (http://esl.tamu.edu). Available electronically from
https : / /hdl .handle .net /1969 .1 /93827.