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.

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?