# Simple reversed heat engine problem

• Joon
In summary, a simple reversed heat engine problem is a theoretical problem used to understand the principles of thermodynamics. It involves analyzing the thermodynamic processes of a system where heat is transferred in the opposite direction of a traditional heat engine. To solve the problem, one must use the laws of thermodynamics and mathematical calculations to determine the efficiency and work output of the system. The key components of this problem include a heat source, heat sink, and working fluid. Real-life examples of this problem include refrigerators, air conditioners, and heat pumps. Solving this problem has practical applications in improving the efficiency and design of thermodynamic systems and understanding the principles of thermodynamics in various fields.
Joon

## Homework Statement

In a reversed heat engine, the work done on the engine is 85 kJ and the heat transfer to the engine from the low temperature region is 260 kJ. Determine:
1. the heat transfer to the high temperature region
2. the coefficient of performance as a refrigerator

## Homework Equations

Q(hot) + Q(cold) + W = 0

## The Attempt at a Solution

260 + 85 = 345 kJ for question 1 if I am correct.
COP = W / Q(input) = 260 / (345-260) =3.05

Your results are correct (even though the symbols of your last equation are wrong - it should read ##COP=\frac{Q_0}{W}##).

Joon
Thanks!

## 1. What is a simple reversed heat engine problem?

A simple reversed heat engine problem is a theoretical problem that involves analyzing the thermodynamic processes involved in a system where heat is transferred in the opposite direction of a traditional heat engine. This problem is commonly used in physics and engineering to understand the principles of thermodynamics.

## 2. How is a simple reversed heat engine problem solved?

To solve a simple reversed heat engine problem, one must use the principles of thermodynamics and the laws of thermodynamics, such as the first and second law. The problem can be solved using mathematical equations and calculations to determine the efficiency and work output of the system.

## 3. What are the key components of a simple reversed heat engine problem?

The key components of a simple reversed heat engine problem include a heat source, a heat sink, and a working fluid. The heat source provides energy to the system, the heat sink absorbs heat from the system, and the working fluid is the substance that undergoes thermodynamic processes to convert heat into work.

## 4. What are some real-life examples of a simple reversed heat engine problem?

Some real-life examples of a simple reversed heat engine problem can include refrigerators, air conditioners, and heat pumps. These systems use a working fluid to transfer heat from a low-temperature region (heat source) to a high-temperature region (heat sink) in the opposite direction of a traditional heat engine.

## 5. What are the practical applications of solving a simple reversed heat engine problem?

The practical applications of solving a simple reversed heat engine problem include improving the efficiency and design of thermodynamic systems such as refrigerators, air conditioners, and heat pumps. It also helps in understanding the fundamental principles of thermodynamics and their applications in various fields, such as energy production and sustainability.

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