Patent attributes
A pre-heater arrangement in a heat regenerative engine for pre-heating water in its delivery path from a condenser sump to a combustion chamber. The engine includes a steam generator, including the combustion chamber, for producing pressurized steam. The engine further includes at least one piston and cylinder arrangement for receiving the pressurized steam in order to drive the piston within the cylinder, and a condenser for condensing steam to liquid. A conduit formed of a heat transferring material provides the delivery path from the condenser sump to the combustion chamber. The pre-heater arrangement includes at least one exhaust port associated with the cylinder for releasing steam from within the cylinder after driving the piston, and a tubular coil connected to the steam delivery conduit and wound about the cylinder, adjacent to the exhaust port, for transferring heat from the exhausted steam to the water traveling through the coil, thereby heating the water on its delivery path to the steam generator. In giving up heat to the pre-heater coil, the exhausted steam begins the process of cooling on its path from the cylinder exhaust port to the condenser where the steam is condensed to a liquid and returned to the sump.
