Question 18, afternoon of day 2, 2014
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Question 18: The answer is B. To save energy, the exhaust gas from a certain process is used as a heat transfer fuel; its pressure is 8.1 MPa. This gas is fed into a heat transfer fuel pipeline with a pressure of 1.6 MPa. Calculate how many flow control orifice plates are required to meet these conditions, and what is the pressure behind each orifice plate in MPa? Please select the answer that is closest in the table below. 4 1 G" Z$ | Answer: Number of plates – First plate, Second plate, Third plate, Fourth plate, Fifth plate b- _-A 2 4.05 1.6 B 3 4.72 2.75 1.6 C 4 5.40 3.60 2.40 1.6 $ M( ^ D 5 6.18 4.72 2.75 2.09 1.6 P1≥0.55P0, P2≥0.55P1, P3≥0.55P2; P2≥0.552; P0, P3≥0.553; P0, Pn≥0.55n. It is determined that n≥2.7 – why not choose 4 or 5? . . . ?
Isn’t it a waste to use so much? 3 are enough