Dual film belt vehicle air conditioning system

Abstract

A vehicle heating, air conditioning and ventilation system comprises a housing (,) within which an evaporator (,) and heater (,) are arranged generally in a diverging V shape enclosing a mixing space (M) between. All forced air passes through the evaporator (,) first, after which it is can go straight through to the mixing space (M), or be diverted down under the heater (,) to flow through the heater (,) and into the mixing space (M), or some combination of the two. The combination of cold and hot flows into the mixing space (M) is determined by a solid dividing wall (,), which partially blocks the evaporator (,) and heater (,) from one another, and a pair of separate rolling film belts (,), one between the evaporator (,) and the dividing wall upstream side (,) and the other located between the dividing wall downstream side (,) and the heater (,). Each belt (,) has respective windows (,) and solid areas (,) which can be shifted to selectively block or unblock flow into the mixing space (M). The two belts (,) in conjunction with the solid dividing wall (,), prevent any air that has passed through the evaporator (,) from by passing the heater (,). In addition, the individuality of the two belts (,) allows a wide combination of temperatures and air flows to be achieved, and also allows the respective windows (,) to be staggered to promote mixing.