Derive an expression for work done in a two stage reciprocating air compressor
Answers
The function of a compressor is to take a sufficient amount of fluid and to increase its pressure. Compressors may be classified into different categories. Some of them are the reciprocating compressor, rotary compressor, etc., Each have their own advantages and disadvantages. As we know, the reciprocating compressors may be used for high pressure applications.
Answer:
Stefan-Boltzmann law, statement that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature. Formulated in 1879 by Austrian physicist Josef Stefan as a result of his experimental studies, the same law was derived in 1884 by Austrian physicist Ludwig Boltzmann from thermodynamic considerations: if E is the radiant heat energy emitted from a unit area in one second (that is, the power from a unit area) and T is the absolute temperature (in kelvins), then E = σT4, the Greek letter sigma (σ) representing the constant of proportionality, called the Stefan-Boltzmann constant. This constant has the value 5.670374419 × 10−8 watt per metre2 per K4. The law applies only to blackbodies, theoretical surfaces that absorb all incident heat radiation.