1) Tractor Test data shows that a tractor has an efficiency of 26 percent when d
ID: 3403470 • Letter: 1
Question
1) Tractor Test data shows that a tractor has an efficiency of 26 percent when developing 107 hp pulling a load of 6,700 lbs at 5 mph. Determine the rate at which this tractor uses fuel (gal/hr) if a gallon of diesel fuel releases 140,000 BTU of heat when burned.
Diesel Usage Rate = XXX gal/hr
2) A food processing plant is installing a new freezer that has a CoP of 3.8. The freezer is rated at an input power of 86 hp. At what rate (Btu/hr) should this freezer be able to remove heat from the products inside the freezer?
Qout Rate = XXX Btu/hr
Explanation / Answer
Given that power delivered by tractor = 107 hp at effeciency of 26%
We know 1hp =746 W
Thus effective power delivered = 107*746*0.26
= 20753.72 J/s
= 74713392 Joule/hr
We know 1 BTU = 1055 joules.
Thus rate at which fuel is used = 74713392/(140000*1055)
= 0.5058 gallon/hr
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