# A 1/1-U counter flow plate and frame heat exchanger is being used to cool liquid ammonia using a…

A 1/1-U counter flow plate
and frame heat exchanger is being used to cool liquid ammonia using a chilled
15% magnesium chloride solution. The ammonia enters the heat exchanger at 32°C
with a flow rate of 5 kg/s. The ammonia must not cooled any lower than 14°C. The
calcium chloride solution enters the heat exchanger at _8°C at a flow
rate of 4.2 kg/s. The plates of the heat exchanger are made from AISI 304
stainless steel. The plate thickness is 0.6 mm and the plate pitch is 3.5 mm.
The vertical port distance is 0.9 m and the horizontal port distance is 0.25 m.
The port diameters are 42 mm.

A 1/1-U counter flow plate
and frame heat exchanger is being used to cool liquid ammonia using a chilled
15% magnesium chloride solution. The ammonia enters the heat exchanger at 32°C
with a flow rate of 5 kg/s. The ammonia must not cooled any lower than 14°C. The
calcium chloride solution enters the heat exchanger at _8°C at a flow
rate of 4.2 kg/s. The plates of the heat exchanger are made from AISI 304
stainless steel. The plate thickness is 0.6 mm and the plate pitch is 3.5 mm.
The vertical port distance is 0.9 m and the horizontal port distance is 0.25 m.
The port diameters are 42 mm. The plate enlargement factor is 1.16. The fouling
factors for ammonia and the magnesium chloride solution can be taken as 2 × 10_6 m2-K/W and 3.2 ×
10_6 m2-K/W, respectively.

a. Determine the maximum
number of plates that can be in this heat exchanger.

b. Determine the thermal
and hydraulic performance of the heat exchanger with the specified number of
plates. Summarize your results in a table similar.