Figure Q1 shows a circuit layout for a heat recovery scheme. The external heating and cooling duties are 28.3 kW and 29.3 kW respectively, and the stream temperatures have the values indicated on the diagram. Calculate: The thermal capacity flow rates of each stream; The minimum rates of external heating and cooling required if a heat recovery scheme is used with the minimum allowable temperature between streams being 20 K; Design and draw a circuit diagram to represent the recovery scheme of (ii) above

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