Explain what the balance point is for an air to air heat pump
What will be an ideal response?
The temperature where the amount of energy used to drive the compressor is equal to the heat energy that is put out by the system.
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A pressure switch is drawn by connecting a ____ to a line.
A. rectangle B. square C. semicircle D. triangle
On a warm summer day, you decide to leave a fan running in your room. The room is 12 ft x 15 ft x 8 ft. The room is full of dry air. When you leave the room, the air temperature is 75oF. The fan has a 0.10 hp motor. Assuming that the air pressure stays constant at 14.7 psia, and that the room is perfectly insulated, determine the air temperature in the room when you return in 8 hours.
Given: Air; L = 12 ft; W = 15 ft; H = 8 ft; T1 = 75oF = 535 R; W?=?0.1 hp=?254.5 Btu/hr; P = 14.7 psia; t = 8 hours Assume: Q = 0 (insulated); ?KE = ?PE = 0 Air behaves as an ideal gas with constant specific heats: cv = 0.172 Btu/lbm-R R = 53.33 ft-lbf/lbm-R P = constant What will be an ideal response?
Conservation tillage systems are now in use on some 85% of the cropland in the USA
Indicate whether the statement is true or false
Chilled water systems use a primary refrigerant to remove heat from a secondary refrigerant in a chiller unit. What is the secondary refrigerant in such systems?
A) Ammonia B) R22 C) R134A D) Water