Slide 6 -Graphic with two coloured lines: the blue line runs from right to left (service fluid), the red one opposite (process fluid). On the x-axis is the exchanger run lenght, on the y-axis the temperatures. -Formulas: the specific heat Cp can be different if different fluids. Slide 7: Lambda in the h formula is the conductivity of the fluid, not to be confused with the lambda value of the steel used in the K formula above. Slide 9: K is found using the formulas in the right up square.