International Journal of Agricultural Sciences
International Journal of Agricultural Sciences ISSN 2167-0447 Vol. 11 (6), pp. 001-017, June, 2021. © International Scholars Journals
Full length Research Paper
Computerized data acquisition to demonstrate the influence of coil density on hog cooling pad heat transfer and long-term operational sustainability
Francisco A. Cabezon1, Tyler C. Field2, Edward P. Winslow3, Allan P. Schinckel4and Robert M. Stwalley III2
1Pipestone Director of Swine Research PO #188 1300 South Hwy 75 Pipestone, Minnesota 56164 USA.
2Purdue University Agricultural & Biological Engineering 225 South University Street West Lafayette, Indiana 47907-2093 USA.
3Winslow Engineering, LLC Consultant 40 Waterfall Court Lafayette, Indiana 47909 USA.
4Purdue University Animal Sciences 270 South Russell Street West Lafayette, Indiana 47907USA.
Accepted 15 December, 2020
Researchers at Purdue University have developed a device which removes excess heat from sows and helps to mitigate thermal stress. The optimal amount of cooling coil beneath the top pad in the device needed further investigation. A second prototype with eight coolant pipes was compared to the original six-pipe prototype design. Bench tests of thermal and heat transfer properties similar to the initial prototype testing were conducted with instrumented heat exchangers and completed using an animal simulator that could maintain a constant temperature. The results indicated that at steady state operating conditions, the heat rejection (heat transfer rejected through coolant) in the eight-pipe unit was significantly greater than the six-pipe unit, heat exchanger efficiency in the eight-pipe unit was significantly larger than in the six-pipe unit, the effectiveness in the eight-pipe unit was significantly greater than the six-pipe unit, and the conductive heat transfer coefficient was larger than that of the six-pipe unit. Intermittent operation testing showed improvement with increasing off periods in peak heat rejection, average heat rejection, efficiency, and effectiveness. This work demonstrated the superiority of the eight-pipe design over that of the six-pipe design, and further design prototypes have incorporated this additional eight-pipe coil length.
Keywords: Biological thermo-physics, conduction, convection, cooling systems, heat transfer, swine, thermal stress.
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