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A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and -34°C and the compressor is estimated to gain a net heat of 450 W from the surroundings. Determine
(a) the quality of the refrigerant at the evaporator inlet,
(b) the refrigeration load,
(c) the COP of the refrigerator, and
(d) the theoretical maximum refrigeration load for the same power input to the compressor.
An open, clean glass tube (theta = 0 degrees) is inserted vertically into a pan of water. What tube diameter is neededif they water level in the tube is to rise one tube diameter (dueto surface tension)
Consider the deck to be simply supported onstringers. Floor beams then transmit the load to the bottom joints of the truss. In each case find themember subjected to the largest tension and largest compression load and suggest why you wouldchoose o..
Determine the maximum force (P) that can safely applied to a steel tee section (20 feet in length) with the point loads at 5 feet from each end. Fixed at one end, pin at the other.
A small building that shelters a water supply pump measures 2 m x 3 m x 2.4 m high. It is constructed of 1- cm thick wood having a thermal conductivity of 0.126 W*m^-1*K^-1.
Describe the problem of lack of coordination between design and construction in a traditional contract. In agency CM,what expertise does the CM provide during the pre-design and design phase.
A 2 m high sandy fill material was placed loosely at a relative density of 47%. Laboratory studies indicated tht the maximum and minimum void ratios of the fill material are 0.92 and 0.53, respectively.
A rigid rectangular shelf is suspended from a rigid ceiling by mean of four rods of diameter .505 inches. The two rods to the left L1 and L2, are made of steel. The two rods to the right R1 and R2 are made of aluminum.
With all the developments and improvements to the GNSS system over the years, what is one important facet of the system that has not improved
Prepare an additional detail claim in order to adjust the cost overrun. For example, under the part "d" instead of timber trusses client prefers steel trusses. It causes massive impact on rates whereas the provided BoQ doesn't have such items. In ..
Calculate the number-average molecular weight of a random nitrile rubber [poly(acrylonitrile- butadiene) copolymer] in which the fraction of butadiene repeat unit is 0.30
If the footings fails at a load of 82 kN, what is the failure load per unit area on the base of a square footing 2.0 m by 2.0 m loaded with its base at the same depth in the same materials
Determine the support reactions at the pin joints A, E and I for the following three pin frame and determine the bending moment at the knees at C and at G. Also determine the shear in the horizontal beams just next to the knee joints. Place half t..
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