Where is the reversing valve located in a split-system air-to-air heat pump?
a. Air handler
b. Indoor coil
c. Heat exchanger
d. Outdoor unit
d
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Five independent projects were ranked in decreasing order by two measures—rate of return (ROR) and present worth (PW)—to determine which should be funded with the total initial investment not to exceed $30 million. (a) Use the results below to determine the opportunity cost in ROR terms for each measure. (b) If a MARR of 15% per year is a firm requirement, how does the opportunity cost help in selecting projects to fund?
What will be an ideal response?
The inner and outer surfaces of a 25-cm-thick wall in summer are at 27°C and 44°C, respectively. The outer surface of the wall exchanges heat by radiation with surrounding surfaces at 40°C and by convection with ambient air also at 40°C with a convection heat transfer coefficient of 8?W/m2•K. Solar radiation is incident on the surface at a rate of 150?W/m2. If both the emissivity and the solar absorptivity of the outer surface are 0.8, determine the effective thermal conductivity of the wall.
What will be an ideal response?
A waveform that is repetitive at a specific time interval is called
A) digital. B) periodic. C) timing. D) frequency.
Torque is defined as:
A. the product of the length, measured in pounds, and the force, measured in feet. B. the product of the length, measured in feet, and the force, measured in pounds. C. the product of the length, measured in newtons pounds, and the force, measured in meters. D. the speed at which an object rotates