A、A.operating the boiler at less than normal water level
B、B.installing fins on the firesides of water-tubes
C、C.increasing the amount of excess air to the burners
D、D.treating the boiler water with chemical oxygen scavengers
更多“The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.”相关的问题
A、Heat is always transferred at a constant rate B、Heat transfer rate increases as temperature difference increases C、The rate of heat transfer is not affected by temperature difference D、The high temperature region is known as a heat sink
A、Heat is given off from a high temperature region known as a heat sink B、Heat transfer rate is affected most by the size of the heat sink involved C、Heat transfer rate is affected most by the temperature difference between the heat source and the heat sink D、Heat transfer by radiation will occur only by mass motion of a fluid substance
A、size of the heat sink B、temperature difference between the regions C、size of the heat source D、total heat of the system
A、reduce gas flow turbulence B、prevent exhaust gas corrosion C、increase the rate of combustion D、increase the rate of heat transfer
A、increase exhaust gas velocity through the boiler B、reduce accumulations of carbon deposits on the heat transfer surfaces C、eliminate exhaust gas pulsations and noise D、increase the rate of heat transfer to the waterside
A、prevent soot fires in the exhaust system B、prevent exhaust gas erosion of the tubes C、increase the velocity of exhaust gas flow D、increase the rate of heat transfer
A、remain constant along the tubes length B、be greatest in a single pass counter flow heat exchanger C、remain constant throughout the heat exchanger D、vary from section to section through out the heat exchanger
A、be the best thing to try if there was no rescue in sight B、increase survival time in the water C、increase the rate of heat loss from the body D、not affect the heat loss from the body
A、latent heat of expansion B、sensible heat of condensation C、heat of compression D、all of the above
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