Questions from Thermal Fluid Science

Q: Repeat Prob. 7–26 for a simple payback period of

Repeat Prob. 7–26 for a simple payback period of three years instead of five years. Data from Prob. 7-26: A country needs to build new power plants to meet the increasing demand for electric power. O...

Q: What is the difference between a refrigerator and a heat pump?

What is the difference between a refrigerator and a heat pump?

Q: The average body temperature of a person rises by about 2°

The average body temperature of a person rises by about 2°C during strenuous exercise. What is the rise in the body temperature in (a) K, (b) °F, and (c) R during strenuous exercise?

Q: Describe an imaginary process that satisfies the first law but violates the

Describe an imaginary process that satisfies the first law but violates the second law of thermodynamics.

Q: Define the coefficient of performance of a refrigerator in words. Can

Define the coefficient of performance of a refrigerator in words. Can it be greater than unity?

Q: What is the difference between a refrigerator and an air conditioner?

What is the difference between a refrigerator and an air conditioner?

Q: Define the coefficient of performance of a heat pump in words.

Define the coefficient of performance of a heat pump in words. Can it be greater than unity?

Q: A heat pump that is used to heat a house has a

A heat pump that is used to heat a house has a COP of 2.5. That is, the heat pump delivers 2.5 kWh of energy to the house for each 1 kWh of electricity it consumes. Is this a violation of the first la...

Q: A refrigerator has a COP of 1.5. That is

A refrigerator has a COP of 1.5. That is, the refrigerator removes 1.5 kWh of energy from the refrigerated space for each 1 kWh of electricity it consumes. Is this a violation of the first law of ther...

Q: In a refrigerator, heat is transferred from a lower temperature medium

In a refrigerator, heat is transferred from a lower temperature medium (the refrigerated space) to a higher temperature one (the kitchen air). Is this a violation of the second law of thermodynamics?...