A shell-and-coil ____ has a coil of pipes within a shell or container.
A. heat exchanger
B. centrifugal chiller
C. air-cooled refrigerant condenser
D. cooling tower
Answer: A
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Indicate whether the statement is true or false
Three different plans were presented to the GAO (General Accounting Office) by a high-tech facilities manager for operating a portable cyber-security facility.
Plan A: Renewable 1-year contracts with payments of $1 million at the beginning of each year. Plan B: A 2-year contract that requires three payments of $600,000 each, with the first one to be made immediately and the second and third payment made at the beginning of the following two 6?month intervals; no payments required during the second year of the contract. Plan C: A 3-year contract that entails a payment of $1.5 million now and another payment of $0.5 million 2 years from now. Assuming the GAO can renew any of the plans under the same conditions, if it decides to do so, which plan is best on the basis of a present worth analysis at an interest rate of 6% per year, compounded semiannually? Solve using (a) factors and (b) a spreadsheet. (Hint: Construct a cash flow diagram before working this problem.)
What is the purpose of bypass piping on a hot water gas fired boiler?
A) ensure that the return water temperature does not drop too low B) to modulate the capacity of the heating system C) to allow the boiler to fire continuously, even with no heating load D) to relieve the extra pressure created by the circulating pump
Most vapor charging is done with the compressor operating while charging is taking place; however, liquid charging:
A) Is always done with the compressor on. B) Can be done either with the system off or operating. C) Is typically done on smaller systems with the system on. D) Is always done with the compressor off.