The trapezoidal channel is made of brickwork n 0.015 with a side slope 1: 2 and longitudinal slope of 0.002 (m/m). 1)-determine the flow rate if the normal depth is 80cm 2)- what is the regime of the flow. 3)-calculate the critical depth. 4)-explain your result using the energy diagram for open channel.

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0