How is a U value calculated?
The U value is the heat exchanger’s performance coefficient, it’s based on the unit’s design, materials and the fluids that flow through. A heat exchanger made from aluminum, will have a higher U value than one made of plastic, because aluminum is a better conductor of heat. A heat exchanger using water as coolant will have a higher U value than it would using air as coolant, because water is a better coolant.
