Explain the difference between an open loop and a closed loop?
What will be an ideal response?
Open loops are open to the air and are supplied with water from a well. The water for an open loop is not re-circulated.
Closed loops are pressurized loops of water buried in the ground that recirculate the same water. The water transfers heat between the ground and the refrigerant in the unit. shows a typical closed loop system.
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?Slush-cast items are hollow with an opening such as in a(n) ____.
A. ?bowl B. ?clamshell packaging C. ?syringe bulb D. ?spindle
A pipe operates at steady-state, steady-flow conditions. R-134a enters the pipe at 120oF and 60 psia, and exits at 50 psia and a quality of 0.90. The volumetric flow rate of the R-134a entering the pipe is 1.75 ft3/s. Assume that there are no work interactions. (a) Determine the heat transfer rate to or from the pipe. (b) Using your equations, plot the rate of heat transfer for the same inlet conditions and outlet pressure, but for outlet qualities varying between 0.0 and 1.0.
Given: R-134a; T1 = 120oF; P1 = 60 psia; P2 = 50 psia; x2 = 0.90; V?1 = 1.75 ft3/s Steady-state, steady-flow; (Inlet = State 1; Outlet = State 2) Assume: W?= 0 ; neglect changes in kinetic and potential energy What will be an ideal response?
235 cm = ____ inches. Round to the nearest hundredth inch.
A. 88.59 B. 90.80 C. 92.52 D. 95.66
Standard manufactured dome or square pans are either 19" × 19" or _____.
a. 24" × 24" b. 30" × 30" c. 36" × 36" d. 48" × 48"