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If the throttling valve in Prob. 11-12 is replaced by an isentropic turbine, determine the percentage increase in the COP and in the rate of heat removal from the refrigerated space.
Prob. 11-12
A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.12 and 0.7 MPa. The mass flow rate of the refrigerant is 0.05 kg/s. Show the cycle on a T-s diagram with respect to saturation lines. Determine
(a) the rate of heat removal from the refrigerated space and the power input to the compressor,
(b) the rate of heat rejection to the environment, and
(c) the coefficient of performance.
a moist soil has a total unit weight of 110 pcf and a water content of 6 percent. assuming that hte dry unit weight is to remain constant , determine how much water , in gallons per cubic yard, must be added to increase the water content to 12 per..
Assuming that the new mill can be scaled to the existing 9ft x 9ftmill and that the length of the new mill is to be equal to itsdiameter, calculate the dimensions of the new mill. Round offfractional mill dimensions exceeding .2ft to the next higher ..
Why is aluminum preferred over iron-based alloys in the aerospace industry and iron-based alloys over aluminum in structural numbers of bridges and buildings
To what extant does the transformers dissipation power increase with rising current?
A simple horizontal curve of radius 750 ft connects two tangents that intersect at an angle of 66º30'. Compute the parts of the curve, including T, L, LC, E, M, and D.
determine the correspondig angular acceleration alpha of the beam, the acceleration of C, and the distance b from B to a point P on the beam centerline which has no acceleration
The symmetrical scissors truss shown below is supported atpoint A and D. The support at D is a rocker bearing and does notproduce a horizontal reaction. A, B, C, D, E & F are pinjoints.
A notched beam, machined from AISI 1020 steel is subjected to reversed bending. Determine the endurance limit Se. Assume the survival rate of 99.9 percent and Cs = 0.75 and that the fatigue stress concentration factor is Kf =2.5.
Consider a mass of air at 18 ºC, which is located at 1,000 m. above mean sea level. A strong wind moves the air mass over a mountain range at 2,500 m. mean sea level and then the air descends to an elevation of 500 m on the leeward
Corporate Decision Making
How much energy is stored in an isolated spherical capacitor of radius ,R=25 cm, if it is charged to a potential of 5000V?
A wastewater treatment plant has a flow of 35,000 m3/day. Calculate the mass of sludge wasted each day (QwXw, expressed in kg/day) for an activated-sludge system operated at a solids retention time (SRT) of 5 days
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