(WO9850697-A1)      The warm water motor has the expansion and contraction of a rigid, liquid, or gas medium converted into reciprocation of pistons contained in an oil circuit which incorporates a turbine (1), used for driving an electrical generator.    The expansion and contraction medium can be provided by a number of steel sheets (9) acting as heat exchange elements, supplied with warm and cold water in alternation, with computer control of the water flow control valves (6,8) and the oil circulation in the oil circuit, keeping circulations separate.    ADVANTAGE -   Allows relatively small temperature differences to be utilised for low-cost generation of electricity.    (DE19719190-C2)      The warm water motor has the expansion and contraction of a rigid, liquid, or gas medium converted into reciprocation of pistons contained in an oil circuit which incorporates a turbine (1), used for driving an electrical generator.    The expansion and contraction medium can be provided by a number of steel sheets (9) acting as heat exchange elements, supplied with warm and cold water in alternation, with computer control of the water flow control valves (6,8) and the oil circulation in the oil circuit, keeping circulations separate.    ADVANTAGE -   Allows relatively small temperature differences to be utilised for low-cost generation of electricity.    (US6192683-B1)      The warm water motor has the expansion and contraction of a rigid, liquid, or gas medium converted into reciprocation of pistons contained in an oil circuit which incorporates a turbine (1), used for driving an electrical generator.    The expansion and contraction medium can be provided by a number of steel sheets (9) acting as heat exchange elements, supplied with warm and cold water in alternation, with computer control of the water flow control valves (6,8) and the oil circulation in the oil circuit, keeping circulations separate.    ADVANTAGE -   Allows relatively small temperature differences to be utilised for low-cost generation of electricity.