One method of providing domestic hot water using a boiler, which was widely used in older North American hydronic systems, was to insert a copper heat exchanger called a ____ into the upper portion of the boiler.
a. flat plate
b. plate and frame
c. tankless coil
d. coil and shell
c. tankless coil
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What three requirements must be met before a bird can be brought into the United States?
What will be an ideal response?
What type of heat transfer takes place when temperature between the source and the absorbent surface is not affected?
A. conduction B. sublimation C. convection D. radiation
A(n) __________________ should be used to verify the absence of voltage.
A. electrical meter B. non-contact voltage tester C. infrared thermographer D. none of the above
In 2007 the population of the world’s 50 least developed countries was estimated to be 0.8 billion people. The UN expects the population in these countries to grow at 1.75% until 2050. What would be the predicted population in the world’s 50 least developed countries in 2050?
What will be an ideal response?