. Author manuscript; available in PMC: 2016 Feb 29.

Published in final edited form as: Comput Electron Agric. 2013 Aug 30;98:136–145. doi: 10.1016/j.compag.2013.08.003

Table 3. Simulation results for pit fans only (bold indicates baseline condition).

	Pit fan number
Parameter	1 pit fan	1 pit fan (measured)^a		2 pit fans
NH₃ (ppm)	0.35	3.9		0.17
CO (ppm)	0.13	1.16		0.32
CO₂ (ppm)	2100	2920		1750
Total operational cost ($)	472	-		1088

	Winter 3-Month Mean Outdoor Temperature
Parameter	Extremely cold (-12.5°C)	Medium cold (-7.5°C)		Mild cold (-2.5°C)

NH₃ (ppm)	0.17	0.17		0.17
CO (ppm)	0.42	0.32		0.23
CO₂ (ppm)	1940	1750		1560
Total operational cost ($)	1304	1088		872
	Wall Insulation (W/m²·K)
	0.2	0.286	0.3	0.4

NH₃ (ppm)	0.17	0.17	0.17	0.17
CO (ppm)	0.31	0.32	0.33	0.34
CO₂ (ppm)	1730	1750	1750	1780
Total operational cost ($)	1064	1088	1091	1119
	Pit-air-exchange ratio
	0.01	0.1	0.2	0.3

NH₃ (ppm)	0.02	0.17	0.32	0.44
CO (ppm)	0.32	0.32	0.33	0.33
CO₂ (ppm)	1720	1750	1770	1790
Total operational cost ($)	1083	1088	1093	1097