Hello, Does anyone know typical values of cutoff ratio in diesel engines? And how have they evolved through time? Thank you!

Consider a two stage reciprocating air compressor with a perfect intercooler operating at the best intermediate pressure. Air enters the low pressure cylinder at 1 bar, 27 C and leaves the high-pressure cylinder at 9 bar. Assume the index of compression and expansion in each stage is 1.4 and that fo

Could we build a four-stroke engine that runs on the exhaust heat of another engine? My idea is to have a four stroke engine **** in the exhaust from another running engine, instead of fresh air. Compress that hot exhaust on it’s compression stroke, then at TDC inject a burst of steam, through some

Hello everybody, I am writing on this forum because I am in doubt with a thermodynamic tool I am trying to develop on Excel: it aims to give an idea (I am not trying to have FEM-like accurate results), about the temperature distribution during a vulcanization process. What I am thinking to do is "t

I am looking for some ideas for my mechanical engineering semester project, and i chose thermodynamics as the subject i will work on, Can i get some suggestions? we only studied basics so far Can be a little advanced preferably with a model/prototype moreover I am not 100% bent on doing a thermo p

• The Laws of Thermodynamics - https://open.spotify.com/episode/1IelV3mvAclNvKWwKAVbv5?si=0a5267d0561b45b6 • Conservation of Energy - https://open.spotify.com/episode/4GOgr3p44Q3ckiEU9OLnLO?si=bcb3e0a500e64118 • Illustrations of Thermodynamics - https://open.spotify.com/episode/2V8vcK1WEed2zZ

The specific speed of a centrifugal compressor is generally _________ (A) Higher than that of axial compressor (B) Less than that of reciprocating compressor (C) Independant of the type of compressor, but depends only on the size of the compressor (D) More than the specific speed of the reciprocati

Hello, we are exploring the possibility of energy recovery of pressurised gas in a sealed gas adsorption vessel by using a scroll pump and letting it run in reverse, mechanically coupling its shaft to another pump. To see if it is viable I wanted to calculate the isentropic work that could be recove

Answer: The ozone(O3) is found in both the stratosphere and troposphere. Ozone in the stratosphere stops harmful ultraviolet rays (UV-B) from reaching Earth. Most of the CFC and HCFC-based refrigerants cause ozone to deplete. One chlorine molecule can destroy up to 100,000 ozone molecules. The dep

Hello, I have the following problem and hope you can help me. I have the setup as shown in the drawing. A pipe that is flowed through, and in the middle of it another pipe, but at the end of this branch is a sensor. Initially the fluid would flow, with a temperature of 25°C. If my thought is correct

What are the advantages of multi-staging in compressors? Why does multi-staging reduce the compressor work?

What is the difference between condenser and evaporator? Fundamentally there is no difference between condenser and evaporator. Both are just heat exchangers and transfer heat from hot fluid to cold fluid which results in the phase change of working fluid. This transfer of heat happens theoretically

A single stage reciprocating compressor is used to compress air from 1 to 8 bar, the cylinder bore is 250 mm whereas stroke length is 300 mm. The clearance volume is 3% of the swept volume and the compression process can be considered isentropic. Calculate effective swept volume of the compressor.

The clearance volume of reciprocating compressor is 100 ml, and the volume of the cylinder at bottom dead center is 1.0 liter. The clearance ratio of the compressor is ______ A. 1/11 B. 1/10 C. 1/9 D. 1/12

Air (Cp = 1 kJ/kg.K , ϒ = 1.4) enters a compressor at a temperature of 27 C. The compressor pressure ratio is 4. Assuming an efficiency of 80%, the compressor work required in kJ/kg is ____ A. 160 B. 172 C. 182 D. 225

Explain global warming caused by refrigerants. What is global warming potential(GWP)? What is ozone depletion potential(ODP)?

When heating an oven. Is this a proces of the 1st, 2nd or ... order. Why? Is there any dead time. If yes, what causes this dead time.