Equation 1
Unknown macro: {latex}
$$
\displaylines{
1 - {{NTU} \over {NTU_
Unknown macro: {max }
}} = {t \over {K + t}} \cr
{{NTU} \over {NTU_
}} = {K \over {K + t}} \cr}
$$
Equation 2
Unknown macro: {latex}
$$
v =
Unknown macro: {L over t}
$$
substitute the equation (2) in equation (1):
Equation 3
Unknown macro: {latex}
$$
\displaylines{
1 - {{NTU} \over {NTU_
Unknown macro: {max }
}} = {L \over {Kv + L}} \cr
{{NTU} \over {NTU_
}} = Kv} \over {Kv + L \cr}
$$
Double reciprocal equation
Equation 4
Unknown macro: {latex}
$$
{1 \mathord{\left/
{\vphantom {1 {\left( {1 - {{NTU} \over {NTU_
Unknown macro: {max }
}}} \right)}}} \right.
\kern-\nulldelimiterspace} {\left( {1 - {{NTU} \over {NTU_
}}} \right)}} = {{Kv} \over L} + 1
$$