Crude oil (mu = 40cp, sg = 0.87) is to be pumped from a storage tank to a refinery through a 10in. sch 20 commercial steel pipeline at a flow rate of 2000 gpm. the pipeline is 50mi long and contains 35 90degrees elbows and 10 open gate valves. the pipeline exit is 150 ft higher than the entrance, and the exit pressure is 25 psig. what horsepower is required to drive the pumps in the system if they are 70% efficient?

In the winter, in order to keep the classroom steadily at 68 f before 10 pm, heating with an average rate of 42,000 btu/hr is provided. assume the outdoor temperature maintains at 32°f, determine the electrical power (kw) required to (a) operate a reversible heat pump (b) operate a real heat pump with a cop (7) of 4.5 and (c) operate an electrical-resistance heater.

Air at a pressure of 1atm and a temperature of 40 c is in parallel flow over the top surface of a flat plate that is heated to a uniform temperature of 120 c. the plate has a length of 0.40m (in the flow direction) and a width of 0.15m. the reynolds number based on the plate length is 50, 000. what is the rate of heat transfer from the plate to the air? if the free stream velocity of the air is doubled and the pressure is increased to 10 atm what is the rate of heat transfer?

The constant-pressure specific heat of air at 25°c is 1.005 kj/kg.°c. express this value in kj/kg k, jg c, kcalk.c, and btu/lbm °f.