In a typical closed-loop hydronic system, the extra space caused by heated liquid is usually provided by a separate chamber called the expansion tank. This tank contains a volume of ____ that is compressed.
a. air
b. gas
c. water
d. sludge
a. air
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A gas, initially at T=500 K, undergoes a Joule-Thompson (constant enthalpy) expansion from P=10 atm to P=1 atm.
A) Prove that (dT/dP)H is equal to: (1/Cp)[T(dV/dT)P – V] (You may assume this expression is valid for parts B and C, even if you are unable to prove it.) B) Find an expression for (dV/dT)P for this gas, in terms of P, T and known constants, assuming it follows the equation of state: V = (RT/P) + aT2P2 For full credit your answer should be an algebraic equation—all derivatives should be evaluated. C) Assuming the heat capacity of the gas is constant at Cp=5R, and that ‘a’ is constant at 2x10-7 L mol-1K-2atm-2, find the final temperature of the gas.
What type of filter frequencies greater than the break frequency provides a significant output?
A. Low pass B. RC C. RL D. High-pass
State 200 kilovolts as megavolts.
Fill in the blank(s) with the appropriate word(s).