Answer:
Step-by-step explanation:
x is the number of junior programmers.
Each junior programmers costs $48,000.
So, the cost of x junior programmers is
48,000x
y is the number of senior programmers
Each senior programmer costs $86,000
So the cost of y seniors programmers is
86,000y
The total cost for x junior programmers and y seniors programmers is
48,000x + 86,000y
To keep costs down, the total spending on these new positions must be under $1,200,000 annually.
So the inequality is:
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