Regardless of temperature before the jet orifice, the "water" that makes contact with the fiber will have a temperature that cannot be exceeded, for it would not be water but live steam. As such, there is a maximum value that the waste water can achieve. Furthermore, cooling is always occurring. Actual recovery water temperature will range somewhere between 120-130 degrees Fahrenheit. The usable BTU content of that water is calculated using the difference between that temperature, and the temperature of the incoming supply water temp. Knowing that temperature differential and the weight of the water at capacity will give us the approximate theoretical BTU content of the wastewater. Knowing that figure, and also known is that it is practically impossible to capture and transfer all that heat energy with 100% efficiency, the paltry amount of that heat content is of lesser value than other means of heat generation and capture.
You are better off increasing the heat efficiency of those processes already in use on the unit to heat the water.
