Consider a hot dog to have the following dimensions and properties: diameter = 20 mm, cp = 3.35 kj/kg⋅k, rho = − 880 kg/m3, and k = 0.5 w/m⋅k. for the hot dog initially at 5 c, exposed to boiling water at 100 c, with a surface coefficient of 90 w/m2⋅k, what will be the cooking time if the required condition is for the center temperature to reach 80 c?

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.