Heat engine lab
Intro: when an engine runs, it pumps pistons that move up and down and provide energy to the engine to it to go. These pistons move because of pressure and heat. This work done on the system is not only mechanical but its also thermodynamic. When a piston undergoes one full cycle its displacement is zero because it comes back to its resting place. This means that its net thermodynamic work to be done should also be zero, as well as its total internal energy. In order to test this experiment is setup with the purpose of verifying that the mechanical work done in lifting a mass, m, through a vertical distance, h, is equal to the net thermal dynamic work done during a cycle by a mass lifting the heat engine. If we calculate the values for thermodynamic work and mechanical work they should be the same. Once these values are calculated they will be compared to each other and the conclusion will be drawn.

Analysis:
Once the results were printed, some values had to be calculated and compared to one another. The first value needed was the Thermodynamic Work on the system which was founded by the equation: With=(pi(d^2))/4*(Pb-Pa)*(hc-hb). Where d was given to be 32.5mm, Pb and Pa where the pressures at the points B and A measured in kPA, and hb and hc are the heights of the piston at point B and C. This comes out to be: Wth= 1.37E^-2J. Next, the mechanical work had to be calculated using the equation: Wm= mgh. Where m is the mass in kg, g is the acceleration due to gravity, and h is the change in height from B to C. This comes out to be: Wm= 1.47E^-2J. When compared together these values should be identical because a joule is a joule is a joule and the values shouldn’t change. These reigns true with this experiment because of how close these values truly are to each other. Questions:

1). The temperatures do change from B to C and from D to A
2). Yes there is thermodynamic work done from B to C which is positive, and from D to A which is...

...Applied Science Research 12th Grade 10/21/07
Stirling Engine
Brandon Risberg Abstract: This paper includes a historical overview of the Stirling engine. It also includes an overview of the mechanics of a Stirling engine, and the results of the author’s project to build a Stirling engine. Although this engine did not work, this paper includes ways to improve in future projects. History: The original Stirling...

...mixture, and (c) the density of the mixture.
3
2. A piston–cylinder device contains 0.85 kg of refrigerant-134a at 10°C. The piston that is free to move has a mass of 12 kg and a diameter of 25 cm. The local atmospheric pressure is 88 kPa. Now, heat is transferred to refrigerant-134a until the temperature is 15°C. Determine (a) the final pressure, (b) the change in the volume of the cylinder, and (c) the change in the enthalpy of the refrigerant-134a.
3. Determine the...

...to analyze this system several assumptions where made such like an isentropic process at the compressor an isenthalpic expansion in the throttling valve. Diagrams will be provided to depict these thermodynamic processes in addition to computing the heat transferred to the system and the work input to the compressor.
Table of Contents
Abstract...

...layer temperature distribution at a given
location on the plate may be approximated as T = 30 + 70 exp ( −y ) where y (in m)
is the distance normal to the plate and T is in °C. If thermal conductivity of the
fluid is 1.0W/mK, the local convective heat transfer coefficient (in W/m2K) at that
location will be
(A) 0.2
7.
(B) 1
(C) 5
(D) 10
A frictionless piston-cylinder device contains a gas initially at 0.8MPa and 0.015
m3. It expands quasi-statically at...

...100KPa and 100oC. Determine the boundary work done during this process.
3.
A refrigerator operates on the ideal vapor compression refrigeration cycle with R-134a as the working fluid between the pressure limits of 120 kPa and 800 kPa. If the rate of heat removal from the refrigerated space is 38 kJ/s, calculate the mass flow rate of the refrigerant.
4.
Consider an ideal gas refrigeration cycle using helium as the working fluid. Helium enters the compressor at 100 kPa and...

...HEATENGINE WORKING CYCLES
An engine is a device which transforms one form of energy into another form. However, while transforming energy from one form to another form, the efficiency of conversion plays an important role. Normally, most of the engines convert thermal energy to mechanical work and therefore they are called ‘heatengines’. Heatengine is a device which transforms...

...ENGINE EXHAUST HEAT RECOVERY WITH QUASITURBINES
KAVIRAJ.P* DINAKARAN.K*
*Pre-final year Automobile students, Madras Institute of Technology,
Anna University, Chennai
Kavi.royalz@gmail.com demon.deen@gmail.com
ABSTRACT
Today hybrid concepts with energy storage are ways to correct the...

...The invention of the internal combustion engine is most probably the result of the developments of several individuals. Around 1780, Dutch scientist Christiaan Huygens built an engine that used gunpowder as a fuel, but this engine was far too dangerous to be practical. His assistant, Denis Papin, also experimented with developing an internal combustion engine, building a simple steam-powered device around 1790. Again, this...