A counterflow heat exchanger is used to cool water from
Tbi_(bi)=90C
to
Tbe_(be)=60C
at a rate of
m_(h)=0.5k(g)/(s)
with water (
Cpc_(c)=4187(J)/(kgK)
entering
T_(cl)=20C
at a rate of
m_(c)=1k(g)/(s)
. The overall heat transfer coefficient is
U_(m)=200(W)/(m^(2)(K))
. Calculate the heat transfer surface required and exit temperature of cold water.