A sealed adiabatic piston/cylinder system is used to compress nitrogen gas (γ = 1.4, ¯m = 28.0 kg/kmol) from T1 = 300 K and p1 = 1.0 bar to a final pressure of p2 = 10 bar. Assume a calorically perfect gas over the temperature range of interest. (a) What is the minimum amount of specific work (wₘᵢₙ) required to achieve this compression? (b) The measured final temperature is T2 = 590 K. If the efficiency is defined as: η = wₘᵢₙ / wₐₜᵤₐₗ , what is the efficiency of this compression process?

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

Items are similar to the free issue items, but their access is limited. (clo5) a)-bin stock items free issue b)-bin stock controlled issue c)-critical or insurance spares d)-rebuildable spares e)-consumables