Engineering, 07.07.2020 14:01 KillerSteamcar
Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. Provide a plausible explanation for this situation (with supporting calculations) by considering a room whose air temperature is maintained at 20 โ throughout the year, while the walls of the room are nominally at 27 โ and 14 โ in the summer and winter, respectively. The exposed surface of a person in the room may be assumed to be at a temperature of 32 โ throughout the year and to have an emissivity of 0.90. The coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 W/m2โK.
Answers: 3
Engineering, 03.07.2019 14:10
When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point
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Engineering, 04.07.2019 18:10
Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26ยฐc with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70ยฐc. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.
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Engineering, 04.07.2019 18:10
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Engineering, 04.07.2019 18:10
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Under conditions for which the same room temperature is maintained by a heating or cooling system, i...
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