Heat Engine Cycle: Answers to (i), (ii) & (iii)

In summary, the conversation is about two reversible heat engines operating in series between a source at 600C and a sink at 30C. The engines have equal efficiencies and the first rejects 400 kJ to the second. The question asks for the temperature at which heat is supplied to the second engine, the heat taken from the source, and the work done by each engine. The assumption is that each engine operates on the Carnot cycle and the answers are 241.3C, 679.1 kJ, 279.1 kJ, and 164.4 kJ.
  • #1
hann8559
1
0
Does anyone can help me in this question?

Two reversible heat engines operate in series between a source at 600C and a sink at 30C.
If the engines have equal efficiencies and the first rejects 400 kJ to the second, calculate:
(i) the temperature at which heat is supplied to the second engine;
(ii) the heat taken from the source;
(iii) the work done by each engine.
Assume that each engine operates on the Carnot cycle.
Answers: 241.3C; 679.1 kJ; 279.1 kJ and 164.4 kJ.


Homework Equations





The Attempt at a Solution

 
Physics news on Phys.org
  • #2
You will need to post some attempt at the solution before anyone can help you.

First of all draw the engine diagram showing the heat and work flows. What is the equation to get the carnot efficiency of an engine?
 

1. What is a heat engine cycle?

A heat engine cycle is a process in which heat is converted into mechanical work. It involves a series of thermodynamic processes, such as compression, heating, expansion, and cooling, that occur in a closed system.

2. What are the three types of heat engine cycles?

The three types of heat engine cycles are the Carnot cycle, the Otto cycle, and the Diesel cycle. The Carnot cycle is the most efficient and is based on a reversible process. The Otto and Diesel cycles are commonly used in internal combustion engines.

3. How does a heat engine cycle work?

A heat engine cycle works by taking in heat from a high-temperature source, converting some of it into work, and then releasing the remaining heat to a low-temperature sink. This process is repeated in a continuous cycle to produce mechanical work.

4. What is the purpose of a heat engine cycle?

The purpose of a heat engine cycle is to convert heat energy into mechanical work. This is useful in various applications, such as powering vehicles, generating electricity, and providing heating and cooling for buildings.

5. How does the efficiency of a heat engine cycle relate to the second law of thermodynamics?

The efficiency of a heat engine cycle is limited by the second law of thermodynamics, which states that heat will naturally flow from a high-temperature to a low-temperature area. This means that a certain amount of heat is always lost in the process, reducing the overall efficiency of the cycle.

Similar threads

  • Engineering and Comp Sci Homework Help
Replies
8
Views
2K
  • Engineering and Comp Sci Homework Help
Replies
1
Views
461
Replies
3
Views
400
  • Engineering and Comp Sci Homework Help
Replies
1
Views
1K
  • Engineering and Comp Sci Homework Help
Replies
4
Views
1K
Replies
1
Views
708
Replies
1
Views
779
  • Engineering and Comp Sci Homework Help
Replies
1
Views
1K
Replies
25
Views
2K
Back
Top