You push a heavy crate out of a carpeted room and down a hallway with a waxed linoleum floor. While pushing the crate 2.5 m out
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Answer:
Explanation:
a. Internal energy and the relative specific volume at are determined from A-17:
.
The relative specific volume at is calculated from the compression ratio:
#from this, the temperature and enthalpy at state 2, can be determined using interpolations
and
. The specific volume at
can then be determined as:
Specific volume,:
The pressures at is:
.The thermal efficiency=> maximum temperature at can be obtained from the expansion work at constant pressure during
b.Relative SV and enthalpy at are obtained for the given temperature with interpolation with data from A-17 :
Relative SV at is
=
Thermal efficiency occurs when the heat loss is equal to the internal energy decrease and heat gain equal to enthalpy increase;
Hence, the thermal efficiency is 0.563
c. The mean relative pressure is calculated from its standard definition:
Hence, the mean effective relative pressure is 674.95kPa