In a process, there are four fluid streams having thermal capacity flow rates

and temperatures as shown in the Table below. Calculate:

a)The rate of external heating and cooling required if there is no heat

recovery between streams;

b)The rate of external heating and cooling required if a heat recovery

scheme Is used with the minimum allowable temperature between

streams being 20 K;

c)The pinch temperatures of the hot and cold streams.

Stream	Thermal capacity rate, mcp (kW/K)	Temperature, (0C)
		Initial	Final
1	0.2	350	50
2	0.4	250	50
3	0.1	20	200
4	0.3	100	300