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A heat pump is used to heat a room where the outside temperature is -10°C. If the heat pump requires a power input of 2 kW, and the room requires a heat input of 15 kW to maintain the temperature at 25°C,
(a) find the COP of the heat pump.
(b) Determine if the heat pump is reversible, irreversible, or impossible.
(c) If 20 kW of heat input was required to maintain the temperature of the room instead, would your answer to part (b) change?
If the takeoff speed of an airplane is 120 mph at sea level, what will it be at Denver (elevation =5000 ft) Use properties of the US Standard Atmosphere
What is the length of a 2 degree increment along a (A) meridian and (B) parallel at 45N and 115W. Assume the radius of Earth is 6370 km.
When you allow a can of carbonated beverage to sit open so that the carbon dioxide is released to the air, does the pH of beverage remain the same, increase, or decrease Why
find the inertia tensor about the origin for a mass of uniform density=1,inside the part of the unit sphere where x>0,y>0,and find the principal moments of inertia and the principal axes.
Specify the radius in mm to the centerline of a 90 degree bend in a 1 in type k copper tube to acheive the minimum energy loss. For such a bend carrying 250 L/min of water at 80'C, compute the energy loss.
A fluid flows into a plug flow reactor of volume, V, with volumetric flow rate, Q. Inflow contains species A and B and concentrations A0 and B0. Within reactor, species A undergoes first order reaction producing
If the effective stack height of the plant is 100 m, and the ground reflects the SO2 emission perfectly what is the SO2 concentration at a sampling point located 2 m above the ground in the town.
Design a 2:1 rectangular duct and fan system to pull 40000 scfm of air carrying a medium-density dust through an FCD (Final Control Device) with a ?P of 6.0 in. H2O. Assume the duct system must extend 120-feet and has four 90° elbows.
What are the effects of degree of hydration on capillary pore volume, capillary pore size, porosity, permeability, and compressive strength of hydrated cement (Degree of hydration: hydrated cement/total cement, increases with time and temperature)
Determine the axial and hoop stresses at the lower end of the vessel. A standpipe 12 ft in diameter and 50 ft tall is being con- structed for use as a storage tank for water with a specific weight of 62.4 lb/ft3. The wall thickness of the vessel is..
Air (an ideal gas) enters an adiabatic nozzle at 3 bar and 38 C and exits at 1 bar and -0.78 C. The process is steady. If the velocity at the inlet is 1 m/s, determine the exit velocity and the ratio of the exit area to the inlet area.
An engineer in a developing country observes that his project bankaccount has grown from 1,600,000 to 1,769,279 (local currencyunits) in 20 days with no deposits or withdrawals being made.
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