A steam turbine system including a low pressure (LP) turbine has a plurality of moisture extraction points at which a steam-water mixture is extracted and passed through a respective one of a corresponding plurality of heat exchangers. Each exchanger passes the steam-water mixture in heat exchange relationship with feedwater in a feedwater conduit. A low pressure and low temperature final stage extraction point on the steam turbine is coupled to a condenser, and water collected at the condenser is directed into the feedwater conduit. The system separates at least some of the steam in the steam-water mixture from the final stage extraction point and passes this steam in heat exchange relationship with water in the feedwater conduit.

A steam power plant with retrofit kit has a steam generator (1) with superheater, a steam turbine set including condensation installations (11), connecting pipelines, auxiliary devices and a generator (10). The steam power plant (22) is distinguished by the fact that the retrofit kit includes a retrofit turbine module (25) which is designed for elevated temperature and for unchanged or modified pressure and is connected upstream of the existing steam turbine set or is exchanged for the high-pressure turbine of the latter. Furthermore, a method for retrofitting an existing steam power plant includes the following steps: connecting a retrofit turbine module (25) for high operating temperatures and unchanged or modified operating pressure upstream of the existing turbine set or exchanging the existing high-pressure turbine for the retrofit turbine module (25); providing a steam generator (1) and/or superheater (32) for high live steam temperature. This improves the efficiency and/or the service life of an existing steam power plant. The retention of as many original parts of the steam power plant as possible leads to an inexpensive solution for increasing output. Moreover, the general infrastructure can be maintained to the extent that to do so is economical and environmentally compatible.

A mass transit system is provided which derives its basic energy from the solar system and recovered heat energy. The system of the invention provides a storage building having a roof and an internal storage area for a multiplicity of individual wheel vehicles, a solar energy collection system on the roof of said building, water storage means in said building, a circulating system circulating water from said water storage means through said solar energy collection system for heating said water and storing said heat as heated water in said water storage means, energy conversion means in said building converting said heat in said water storage means to rotary energy, a plurality of wheeled vehicles, energy storage means in each said wheeled vehicle, means connecting said energy conversion means selectively to the energy storage means of each said wheeled vehicle for transferring and storing energy from the water storage means to the energy storage means in said wheeled vehicles, energy transmission means in each wheeled vehicle selectively connecting said energy storage means to drive wheels on said vehicle for driving the same, a braking system in each wheeled vehicle acting selectively to stop said drive wheels, a heat collection system surrounding said brakes for collecting frictional heat resulting from braking said vehicle, a vehicle solar heat collection on each said vehicle, fluid energy transfer means receiving the heat from the friction heat collection system and from said solar heat collection system on the vehicle, a drive means selectively connected to said energy storage means for adding driving energy thereto, said drive means connected to said fluid energy transfer means and energized thereby.