For a given (known) heat load and inlet temperatures, the outlet temperatures of both fluids can be calculated with the thermophysical properties known. A design engineer does not know either the...

For a given (known) heat load and inlet temperatures, the outlet temperatures of both fluids can be calculated with the thermophysical properties known. A design engineer does not know either the magnitudes of the required mass flow rates of the fluids or the required size of the heat exchanger. Can he or she determine these three variables using the data available?