____ is usually 3/16 in. (4.8 mm) or thicker and measured in inches and fractions of inches.
A. Plate
B. Sheet
C. Pipe
D. Tubing
Answer: A
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A 2-ton heating/cooling system requires 1,100 ft. of horizontal geothermal ground-loop? heat exchanger. How long would the ground-loop have to be for a 5-ton system?
Fill in the blank(s) with the appropriate word(s).
A simple insulated concentric tube heat exchanger is used to cool hot oil by transferring heat to water. Hot oil enters the center tube at 120°C, and a mass flow rate of 5.0 kg/s. The oil exits the heat exchanger at 80°C. Liquid water flows through the annulus surrounding the central tube. The water enters at 10°C.
(a) If the water exits at 50°C, determine the mass flow rate of the water. (b) Using your heat exchanger model to acquire the data, plot the required mass flow rate of the water for water exit temperatures ranging from 15°C to 75°C. Consider the specific heat of the oil to be 1.90 kJ/kg-K, and the specific heat of the liquid water to be 4.18 kJ/kg-K. Consider State 1 to be the oil inlet and State 2 to be the oil outlet. Consider State 3 to be the water inlet and State 4 to be the water outlet. Given: T1 = 120°C; m?oil = 5.0 kg/s; T2 = 80°C T3 = 10°C, T4 = 50°C Assume: Q?=0 (insulated). Also, given no other information regarding the heat exchanger, make the following common heat exchanger assumptions: W?=?KE=?PE=0 Also, assume the heat exchanger is a multiple-inlet, multiple-outlet, steady-state, steady-flow device. What will be an ideal response?
What natural forces often promote the spread of pests from plant to plant?
a. wind c. sunlight b. splattering rain d. both "wind" and "splattering rain"
When blowing through the vacuum supply hose, if air passes through the check valve into the booster ________
A) Replace the vacuum pump B) The check valve is functioning properly C) Replace the booster D) Replace the check valve