A heat engine takes in 2500J and does 1500J of work.   a) How much energy is expelled as waste?            b) What is the efficiency of the engine?

Question 17 A certain engine extracts 1300 J of heat from a hot temperature reservoir and discharges 700 Jof heat to a cold temperature reservoir. What is the efficiency of this engine? O 27% O 54% O 80% O 13% O 40%

A heat pump removes 2060 J of heat from the outdoors and delivers 3060 J of heat to the inside of a house. (a) How much work does the heat pump need?(b) What is the coefficient of performance of the heat pump?

A car engine has an efficiency of 23% and produces an average mechanical work of 26 kJ/s during its operation. (a) How much heat per second input (QH) is needed? and (b) how much heat is discarded as waste heat (QL) per second?

A large electrical power station generates 1400 MW of electricity with an efficiency of 31 %. a) How much heat does the power station need to generate this amount of electricity in one day? Qn = b) How much heat is exhausted to the environment in one day? Qc = J c) The exhaust heat is transferred to the ambient air at 15 °C. What is the change in entropy of the surrounding air in one day? AS = J/K %3D d) The heat driving the generators is in the form of superheated steam at 260 °C. If a Carnot engine had been used instead, what would it's efficiency be? Efficiency = e) How much work was lost (left undone) because a Carnot engine was not used? WCarnot Wactual = %3D

Suppose that a heat engine takes 3.20  104 J of heat from the high-temperature reservoir to produce 1.90  104 J of mechanical work. (a) What is the efficiency of this engine?   (b) How much waste heat does it produce?

A Carnot heat engine receives 700kJ/s from a heat source and produces 430 kW of power. At what rate is heat transferred? What is the thermal efficiency of this heat engine?

An engine absorbs 500 J of heat and reject 100 J of heat to cold reservoir in each cycle.  What is its efficiency? From the last question, how much work does the engine do in three cycles?

As a gasoline engine is running, an amount of gasoline containing 15,000J of chemical potential energy is burned in 1 s. During that second, the engine does 3,000 J of work. (b) The burning gasoline has a temperature of about 2500 K. The waste heat from the engine flows into air at about 300 K. What is the Carnot efficiency of a heat engine operating between these two temperatures?

A heat engine operates between a reservoir at 28°C and one at 323°C. What is the maximum efficiency possible for this engine?