The difference between 80 percent efficiency furnaces and 90 percent efficiency furnaces is that 90 percent efficiency furnaces:
A) Burn more gas to increase the heat exchanger temperatures.
B) Use more combustion air per 1,000 BTU firing rate.
C) Use more efficient air filters.
D) Have an extra recuperative heat exchanger that condenses water out of the flue gas.
D
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Follow the steps of the Systematic Approach of Section 14.4—that is, (1) identify the system, (2) determine whether the process is batch or rate, (3) construct a schematic diagram with inputs and outputs, (4) Label known material quantities or rates of flow and so on. A solution of potassium chromate (K2CrO4) is to be used to produce K2CrO4 crystals using an evaporator and crystallizer/filter. A 38 percent solution is fed to the evaporator. The stream leaving the evaporator is 48 percent K2CrO4 and is fed to the crystallizer/ filter. Pure K2CrO4 crystals are produced and the remaining solution is 44 percent K2CrO4. This solution is cycled back to the evaporator. If 1.2 t/h of pure crystals are needed, calculate the total input to the evaporator, the feed rate to the
crystallizer/filter, and the water removed from the evaporator. What will be an ideal response?
Explain what the approach to the tower is and how it is calculated.
What will be an ideal response?
Concrete and ____ masonry units are the traditional materials for building foundations.
A. concrete B. ICF C. wood D. brick
Because microwave communications are line of sight, what must be made to ensure that no obstructions lie anywhere in the line between transmitter and receiver?
A. Yagi–Uda configuration B. Polar pattern C. Path study D. Link-budget analysis