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A heat pump operating at steady state provides 36,000 kJ/hr to maintain the temperature in a building at 22C. The heat pump operates with a coefficient of performance 75% that of a reversible cycle operating between the same thermal reservoirs. For each of the possible low temperature reservoirs below, determine the power required to run the heat pump and the daily cost if electricity costs $0.09/kW-hr.
a) outside air at -10C
b) a pond or lake at 5C
c) the ground at 13C
a contractor is required to prepare a soil surface so that its planar and the normal direction to the surface is within
Find the area of a semi-circle truncated at one end (on the flat side) by a length l. Express the area in terms of the radius R and l -- you can define additional variables in terms of R and l for neatness. Find the area with the hatched lines (the l..
both a gage and manometer are attached to a gas tank to measure its pressure. if the reading on the pressure gage is 80
Consider the classical adiabatic saturation process in which a stream of is mixed adiabatically and isobarically (T1)with a stream of liquid water in order (T2) to become a saturated air +water vapor mixture . Show that the adiabatic saturation tempe..
A 40 mm diameter hole is drilled 3 m deep into the steel shaft. When the two torque are applied, determine (a) the maximum shear stress in the shaft: and (b) the angle of rotation of the free end of the shaft. Use G= 83GPa for steel.
refrigerant 134a at -10degc 1.4 bar and a mass flow rate of 280 kghr enters an insulated compressor operating at steady
the company you work for makes the casting for the rectangular pan 300 mm long x 200 mm wide x 60 mm deep with a 3 mm
steam powerplant produces 200 mw power. saturated steam exits boiler at 3mpa pressure. turbine exits 10kpa pressure.
a basketball of mass 0.570 kg is dropped from rest from a height of 1.25 m. it rebounds to a height of 0.734 m. a how
the molar volume cm3mol of a binary liquid mixture at t and p is given by v 120x170x215x18x2x1x2a find expressions for
member abc has a mass of 2.4-kg and is attached to a pin support at b. and 800 g sphere d strikes the end of member abc
as the hollow steel g 77 gpa shaft shown rotates at 180 rpm a stroboscopic measurement indicates that the angle of
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