Hi,
Sorry I didnt understand your question fully. However with some understanding below is my thought. with equation mentioned above you may get outlet temp based on given mass flow rate, in other words you can also calculate mass flow rate based on desired temp at given heat source. If you want to increase mass flow rate keeping eye on outlet temp, then you can use conditional expression (e.g. if statement). If temp @ outlet is higher than desired outlet temp then increase mass flow rate with certain increament.
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