Thermodynamic possiblity for outlet temperatures of heat exchanger

In summary, a heat exchanger is a device used to transfer heat between two fluids without mixing them. The direction of heat transfer depends on the temperature difference between the fluids. The thermodynamic possibility for outlet temperatures is based on the laws of thermodynamics and is affected by factors such as inlet temperatures and flow rates. The design of a heat exchanger can greatly influence the outlet temperatures, but there are limitations due to thermodynamic laws and external factors.
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dreamz
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TL;DR Summary
Temperatures of exhaust gas and water at heat-exchanger outlet
I have a heat & mass balance diagram wherein there is a shell and tube heat exchanger to recover heat from hot exhaust gas using cold water. The exhaust gas inlet temperature is 120°C and the outlet is at 40°C. The inlet water temperature is 35°C while the outlet water temperature is at 50°C.

I wish to know, that whether an exhaust outlet of 40°C and water outlet of 50°C is thermodynamically possible?

Kindly provide reasons also.
 
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  • #2

1. What is a heat exchanger?

A heat exchanger is a device that is used to transfer heat from one fluid to another, without the two fluids coming into direct contact with each other. It is commonly used in industrial processes and heating/cooling systems.

2. How does a heat exchanger work?

A heat exchanger works by having two fluids flow through separate channels, with one fluid being heated or cooled by the other fluid. The heat is transferred through a solid barrier, such as metal plates or tubes, that separates the two fluids.

3. What factors affect the outlet temperature of a heat exchanger?

The outlet temperature of a heat exchanger is affected by several factors, including the flow rate and temperature of the inlet fluids, the surface area of the heat exchanger, and the type and thickness of the barrier material.

4. How can the outlet temperature of a heat exchanger be calculated?

The outlet temperature of a heat exchanger can be calculated using the principles of thermodynamics and heat transfer. This involves considering the energy balance of the system, taking into account factors such as the heat transfer coefficient, overall heat transfer coefficient, and thermal conductivity of the barrier material.

5. What is the maximum possible outlet temperature for a heat exchanger?

The maximum possible outlet temperature for a heat exchanger is determined by the inlet temperatures and flow rates of the two fluids, as well as the design and efficiency of the heat exchanger. It is important to note that the maximum possible temperature may not always be achievable due to practical limitations and losses in the system.

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