Three types of solar heat collectors were evaluated for supplying part of the winter heating requirements of six different swine systems. Five methods of evaluation were performed: net present value, internal rate of return, payback period, percent heating cost savings, and percent purchased fuel savings. While most of the study assumed inflationary conditions a linear programming minimization model was used to select the system promising the greatest heat savings without inflation. It was found that generally the one-cover covered plate collectors were the most cost efficient. High capacity units tended toward more costly systems incorporating two-cover suspended plates and storage provisions. Solar energy proved to be a viable way to reduce purchased fuel and reduce heating costs...
Sloth, Darrell Gene. The economic feasibility of solar heat in Iowa swine production. 1980.
James, Sydney C. and Sloth, Darrell G., "The Economic Feasibility Of Solar Heat In Iowa Swine Production" (1982). ISU Economic Report Series. 12.