1. An engine rejects 200kW when running at a thermal efficiency of 22%. The calorific value of the fuel used is42MJ/kg. Determine(i)the heat received by the engine;(ii)the power output in kW, and(iii)the mass of fuel used/h2. A 20kg block of iron at 50°C is dropped into an insulated tank which contains 0.5m of water at 25°C. If thespecific heat of the iron, Cpiron, is 0.45 kJ/kg°C and the specific heat of the water, Cpwater, is 4.184 kJ/kg'C.Determine:(a)mass of the water;s)(b) the temperature at which thermal equilibrium is reached, andFor equilibrium AUsystem-AUron+AUwater 0(c)the amount of energy added to the water.AU=mwaterCpwater (tequili"twater)waterThe barometer of a mountain hiker reads 910mbars at the beginning of the hike and 710mbars at the end.3. (а)Determine the vertical distance climbed. You can assume an average air density of 1.2kg/m4.

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1. An engine rejects 200kW when running at a thermal efficiency of 22%. The calorific value of the fuel used is 42MJ/kg. Determine (i) the heat received by the engine; (ii) the power output in kW, and (iii) the mass of fuel used/h

1. An engine rejects 200kW when running at a thermal efficiency of 22%. The calorific value of the fuel used is 42MJ/kg. Determine (i) the heat received by the engine; (ii) the power output in kW, and (iii) the mass of fuel used/h

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

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Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.8P

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Question

100%

1. An engine rejects 200kW when running at a thermal efficiency of 22%. The calorific value of the fuel used is
42MJ/kg. Determine
(i)
the heat received by the engine;
(ii)
the power output in kW, and
(iii)
the mass of fuel used/h
2. A 20kg block of iron at 50°C is dropped into an insulated tank which contains 0.5m of water at 25°C. If the
specific heat of the iron, Cpiron, is 0.45 kJ/kg°C and the specific heat of the water, Cpwater, is 4.184 kJ/kg'C.
Determine:
(a)
mass of the water;
s)
(b) the temperature at which thermal equilibrium is reached, and
For equilibrium AUsystem-AUron+AUwater 0
(c)
the amount of energy added to the water.
AU
=mwaterCpwater (tequili"twater)
water
The barometer of a mountain hiker reads 910mbars at the beginning of the hike and 710mbars at the end.
3. (а)
Determine the vertical distance climbed. You can assume an average air density of 1.2kg/m
4.

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