The heat rate when used as a heat pump is nearest:
The ideal vapor refrigeration cycle utilizes R134a between saturation temperatures of ?20°C and 40°C. It has a flow
rate of 0.6 kg/s.
A) 106 kJ/s
B) 121 kJ/s
C) 148 kJ/s
D) 182 kJ/s
A) 106 kJ/s
A heat pump uses the heat from the condenser. To find h2, use s2 = s1 (use the IRC Calculator):
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Reactive power (Pr) in an inductor is defined as the rate at which an inductor stores or returns energy and is measured in:
A) volt-ampere reactive. B) volts per time constant. C) current per time constant. D) watts reactive.
Ultrasonic leak detectors detect refrigerant leaks by:
A) Seeing the refrigerant by sensing the effect that the leaking refrigerant gas has on sonar. B) Seeing the change in ultraviolet radiation around the area of the leak. C) Hearing the high frequency of the escaping gas. D) Seeing the change in infrared radiation around the area of the leak.
An insulated tank initially contains 1.25 kg N2 gas at 150 kPa and 25oC. The tank is to receive 3.0 kg of N2 gas from a supply line with N2 at 20oC. Determine the final temperature and pressure of the N2 in the tank.
State i: Inlet (Supply Line); State 1: Initial State; State 2: Final State Given: N2; Ti = 20oC; P1 = 150 kPa; T1 = 25oC = 298 K; m1 = 1.25 kg; mi = 3.0 kg; P2 =600 kPa; Assume: Q = 0 (insulated). Also, as no information is given and these terms are unlikely to be significant, W = 0, and kinetic and potential energy can be neglected. No flow out of the tank. V = constant . N2 is an ideal gas with variable specific heats. What will be an ideal response?
____________________ is a drug crop and one of the top 10 crops grown in the United States
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