Engineering, 26.11.2019 03:31 rubiim9610
Arefrigerator door has a height and width of h = 1 m and w = 0.65 m, respectively, and is situated in a large room for which the air and walls are at t_infinity = t_sur = 25 degree c.
the door consists of a layer of polystyrene insulation (k = 0.03 w/m cdot k) sandwiched between thin sheets of steel (epsilon = 0.6) and polypropylene.
under normal operating conditions, the inner surface of the door is maintained at a fixed temperature of t_s, i = 5 degree c.
a) estimate the heat transfer through the door for the worst-case condition corresponding to no insulation (l = 0).
b) estimate the heat transfer and the outer surface temperaâture for an insulation thickness of l = 15 mm.
Answers: 3
Engineering, 04.07.2019 18:10, koolgurl2003
Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.
Answers: 1
Engineering, 04.07.2019 18:10, alyssabailey7545
Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines
Answers: 1
Engineering, 04.07.2019 19:10, gabrielaperezcz
Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?
Answers: 3
Arefrigerator door has a height and width of h = 1 m and w = 0.65 m, respectively, and is situated i...
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