A mild steel steam pipe (k=54 W/mK) has an outside diameter of 15 cm and a wall thickness of 0.7 cm. It is insulated with a 5.3 cm-thick layer of 85% magnesia insulation(k=0.073 W/mK). Superheated steam at 500 K flows through the pipe, and the inside heat transfer coefficient is 35 W/m2K. Heat is lost by convection and radiation to surroundings at 300K, and the sum of outside convection and radiation coefficients is estimated to be 8 W/m2K. Find the rate of heat loss for a 20 m length of pipe.

When using the ohmmeter function of a digital multimeter, the leads are placed in what position relative to the component being tested? a. parallel b. control c. series d. line

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.