Abstract: A vehicle seat including a spiral-shaped air-tube seat ventilation system having a seat pad module. The seat pad module includes a foam cushion member, with the cushion member defining a spiral groove. An elongated tube defining a plurality of orifices in fluid communication with the tube interior is disposed in the spiral groove, with a spacer fabric pad and a heating pad coupled to the foam cushion member. One or more of the seat pad modules is then coupled to one or more of the vehicle seat back and the vehicle seat base.

Abstract: An exhaust gas heat recuperation system for use with a boiler is disclosed. The heat recuperation system includes a plate-type heat exchanger for exhaust gas heat recovery for exchanging heat between an exhaust gas and a charge gas. The heat exchanger preferably includes a series of exhaust gas plates stacked alternately with, and parallel to, a series of charge gas plates. Each of the exhaust gas plates and charge gas plates have raised contained ridges to form a substantially sinusoidal path for directing the respective gas therealong. The shape of the path reduces exhaust gas particulate deposition. The charge gas flows in a countercurrent to the exhaust gas to facilitate maximum heat transfer. The heat exchange is particularly useful in laminar flow conditions.

Abstract: An exhaust gas heat recuperation system for use with a boiler is disclosed. The heat recuperation system includes a plate-type heat exchanger for exhaust gas heat recovery for exchanging heat between an exhaust gas and a charge gas. The heat exchanger preferably includes a series of exhaust gas plates stacked alternately with, and parallel to, a series of charge gas plates. Each of the exhaust gas plates and charge gas plates have raised contained ridges to form a substantially sinusoidal path for directing the respective gas therealong. The shape of the path reduces exhaust gas particulate deposition. The charge gas flows in a countercurrent to the exhaust gas to facilitate maximum heat transfer. The heat exchange is particularly useful in laminar flow conditions.