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Air is compressed in an insulated cylinder from 20°C to 200°C. If the initial pressure is 100 kPa absolute, what is the maximum final pressure? What work is required?
A kitchen contains a standard refrigerator and a window air conditioner. The refrigerator operates at steady state using 200 W of electric power and a COP of 3. If the kitchen is well insulated:
the cooling coil of a small air-conditioning system is to be designed for a heat-transfer rate of 48000 btuhr from air
A common assumption for biorefinery capacities is 2000 Mg/day of feedstock input capacity. What is the land area required to grow this quantity of biomass from corn stover with land availability (f) of 40%? How does this compare to switchgrass?
Diffusion of carbon into BCC iron for 12 hours at a temperature of 5000C results in a carbon concentration of 0.2 wt% at a depth 2 mm from the surface. At what depth would the concentration be 0.2 wt%, if the diffusion occurred for 6 hours at 8000C?
a cylinder fitted with a piston has an initial volume of 2 ft3 and contains nitrogen at 20 lbfin2 at 80 f degrees. the
a reversible heat pump cycle operates between hot and cold reservoirs at th 27degc and tc -3degc respectively.
Consider the air chilling process of Problem 7.110a. Determine the outlet air temperature To and mass rate at which the PCM is melted for s = 0.30. Assume the total mass of PCM and the mass flow rate of air are unchanged. The length of the containmen..
small objects are delivered to the 72-in. inclined chute by a conveyor belt a which moves at a speed v1 1.2 ftsec. if
A heat pump operates at steady state maintains a house at 22 0C when the outside is -22 0C using 15 kW of power. The manufacturer claims that the power input required is 3.2 kW. Applying energy and entropy rate balances evaluate the claim.
a piston-cylinder containing 1 kg air at 500degc and 500 kpa is connected to a carnot heat engine where the environment
Determine the values of the constants A and σ o for the material. [Remember that the tensile strength is the maximum engineering stress.]
Determine the rated value of the power coefficient CP and compare this with the value at the Betz limit. Assume the air density ρ = 1.2 kg/m3
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