Hot water (cph = 4188 J/kg∙K) enters a thin-walled double-pipe counterflow heat exchanger at 2.5 kg/s and 100°C. The overall heat transfer coefficient and the surface area are 1000 W/m2 ∙K and 21 m2 , respectively. For the cold stream, cold water (cpc = 4178 J/kg∙K) enters the heat exchanger at 5 kg/s and 20°C. (a) Determine the heat transfer rate for the heat exchanger (in W)

Liquid flows at steady state at a rate of 2 lb/'s through a pump, which operates to raise the elevation of the liquid 100 ft from control volume inlet to exit. the liquid specific enthalpy at the inlet is 40.09 btu/lb and at the exit is 40.94 btub. the pump requires 3 btu/s of power to operate. if kinetic energy effects are negligible and gravitational acceleration is 32.174 tt/s, the heat transfer rate associated with this steady state process is most closely 1)-2,02 btu/s from the liquid to the surroundings 2)-3.98 btu/s from the surroundings to the liquid. 3)-4.96 btu/s from the surroundings to the liquid. 4)-1.04 btu/s from the liquid to the surroundings.