Atank containing 4.7 m3 of liquid glycol must be cooled from 33°c to 5°c in 35 minutes. the glycol is constantly circulated with a pump, which does work on the liquid at a rate of 7.5 kw. the density of glycol is 1110 kg/m3 and the specific heat capacity is 2.36 kj/kg. k. determine the rate of cooling, in kw.

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.