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Document Type

Thesis - University Access Only

Award Date


Degree Name

Master of Science (MS)

Department / School

Agricultural Engineering


A parametric analysis was made on open and closed earth loop systems using the Kelvin line-source theory. The analyses included varying the pipe diameter, pipe type, pipe depth, fluid velocity, soil thermal conductivity, and fluid type (for closed systems). The open loop system uses substantially shorter pipe lengths and produces smaller heat loads than the closed system. With modifications to the line-source theory, an analysis was made on a swine facility requiring 8790 W of supplemental heat. The open-loop system would require 80 W to move the air through 400 m of pipe with an inlet temperature of -29°C. The closed-loop system would require 148 W to move the calcium chloride through 1653 m of pipe with an inlet temperature of -5°C. Making a comparison based on an equivalent inlet temperature of soc, the open-loop system would require 58 W to move the air through 275 m of pipe; but the system would produce only 2850 W of supplemental heat.

Library of Congress Subject Headings

Barns -- Heating and ventilation

Livestock -- Housing -- Heating and ventilation

Farm buildings -- Thermal properties



Number of Pages



South Dakota State University