Rotary heat wheel cassette assembly

A rotary regenerative heat exchange assembly comprising:

• a heat exchange wheel assembly including a mounting frame, a heat exchange wheel having a rotation axis, a wheel frame including an inner hub and an outer band and radially-extending bars extending between said hub and outer band, a plate secured to said frame and having an opening;
• means for mounting said heat exchange wheel and wheel frame in said mounting frame for rotation within said opening of said plate about said rotation axis, motor means, secured to said mounting frame, for rotating said wheel about said axis, first seal means disposed between said wheel and said plate within said opening for preventing air from passing between said wheel and said plate and second seal means, fixed relative to said mounting frame on each side of said wheel, so as to divide said wheel into two air-flow sections, said heat exchange wheel including a plurality of wedge-shaped elements made of heat exchange material and means for securing said wedge-shaped elements in said wheel, said means for securing including a plurality of flexible strips a plurality of flexible strips releasably secured to said hub and outer band and cooperative with said radially-extending bars so that select ones of said wedges can easily be removed and inserted by removing select ones of said strips by flexing said strips so as to release and secure said strips from and to said hub and outer band;
• and
• cabinet means comprising a first opening for receiving said heat exchange wheel assembly in an operative position, means for supporting said heat exchange wheel assembly so that said wheel assembly can be slid from said first opening to said operative position and slid back out said opening in order to maintain said wheel assembly, and air flow openings for securing said heat exchange assembly to a source of relatively cool air and to a source of relatively warm air so that when said heat exchange wheel assembly is properly located in said operative position in said cabinet means one of said air flow sections of said heat exchange wheel intercepts the flow of said relatively cool air and the other of said air flow sections of said wheel intercepts the flow of said relatively warm air and said second seal means prevents the cross leakage of relatively cool air through said other section of said wheel and of relatively warm air through said one section of said wheel.