Which of the following statements are true? Check all that apply. The amplitude is 10. The graph is stretched vertically by a fa
ctor of 5. The frequency is StartFraction 1 Over pi EndFraction. The graph is stretched horizontally by a factor of 2. The period is 4π.
2 answers:
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Answer:
The log-mean-temperature-difference is 24.03⁰C
Step-by-step explanation:
First we need to know if the heat exchanger is in parallel flow or counter-flow. However, counter flow arrangement is best used to recover heat.
L.M.T.D for counter flow is given as;
where;
Thf₁ is the initial temperature of the hot fluid = 80°C
Tcf₂ is the final temperature of the cold fluid = 51.5°C
Thf₁ - Tcf₂ = 80 - 51.5 = 28.5⁰C
Thf₂ is the final temperature of the hot fluid = 30°C
Tcf₁ is the initial temperature of the cold fluid = 10°C
Thf₂ - Tcf₁ = 30 - 10 = 20⁰C
Therefore, the log-mean-temperature-difference is 24.03⁰C
(b)
A polynomial has the form
±
+ ....
the only expression fitting this description is : x² + 2x + 7