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1. A small house kept at 20?C inside loses 12 kW to the outside ambient at 0?C. A heat pump is used to help heat the house together with possible electrical heat. The heat pump is driven by a motor of 2.5 kW, and it has a COP that is one-quarter that of a Carnot heat pump unit. Find the actual heat pump COP and the exergy destruction in the whole process.
2. A farmer runs a heat pump using 2 kW of power input. It keeps a chicken hatchery at a constant 30?C, while the room loses 10 kW to the colder outside ambient at 10?C. Find the COP of the heat pump, the rate of exergy destruction in the heat pump and its heat exchangers, and the rate of exergy destruction in the heat loss process.
A "slap shot" in the game of hockey can cause an increase in the velocity of a 5 oz puck from 2 ft/sec to 110 ft/sec. What would be the corresponding increase in the kinetic energy (ft-lb) of the puck.
According to barton(1974) the quality of a given rock mass can bedetermined using the equation below. explain each of the parametersin the equation is obtained.
The 90lb door has its center of gravity at G. A)Determine the components of reaction at hinge A if hinge B resists only forces in the x and y directions and A resists forces in the x,y,z directions.
A tangent section of highway has a -1.0% grade and ends at station 4+75 and elevation 82 ft. It must be connected to another section of highway that has a -1% grade and that begins at station 44+12 and elevation 131.2 ft.
A compressible 12-ft clay layer beneath a building is overlain by a stratum of sand and gravel and underlain by impermeable bedrock. The total expected primary consolidation settlement of the compressible clay layer due to the building load is 4.60 i..
An Element of soil (sand) behind a retaining wall is subjected to an increase in vertical stress of 60kPa and an increase in lateral stress of 25 kPa. Determine the increase in vertical and lateral strains,
A horizontal curve on a two-lane highway is designed with a 818.51ft radius, 12ft lane, superelevation 6.4%, and a 50mph design speed. Deflection angle is 90 degree. The maximum relative gradient is 0.50.
The water is pumped out of the aquifer at a rate of 2000 gpd, treat it with activated carbon and then put it back into the aquifer. At the flow rate how long until al the PCE is removed, assume carbon removed 100% of the PCE (ans. 54 days)
Three cylinders from the same mix were tested for strenght. Cylinders A and B were cast in 4x8 molds while cylinder C was cast in a 6x12 mold. The total loads were as follows; cylinder A= 65,200 lbs., cylinder B= 68,550 lbs., cylinder C= 151,190 l..
Box I contains 3 red and 5 white balls, while Box II contains 4 red and 2 white balls. A ball is chosen at random from the first box and placed in the second box without observing it's color. Then a ball is drawn from the second box.
If the 50 kg crate starts from rest and travels a distance of 6m up the plane in 4s, determine the magnitude of force P acting on the crate. The coefficient of Kinetic friction between the crate and the ground is 0.25
a layer of clay, 5m thick, overlies a deposite of sand, 5m thick, which is underlaid by rock. the water table in the sand is sub-artesian with a level at 2m below fround level. the saturated unit weights of the clay and sand are 21 and 16 KN/m^3 r..
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