10222 Heat Recovery

Heat recovery from a steam turbine is somewhat misleading since a steam turbine can be defined as a heat recovery device. Producing electricity in a

* Boilers convert thermal energy, produced in the combustion of a wide range of fuels (or waste heat from industrial processes), into steam or hot water. They come in various sizes, and boiler fuels can include fossil fuels such as coal, oil, natural gas, and refining crude, or renewable fuels like wood or municipal waste. Boilers are often used with byproduct fuels. Recent developments include improved tubing material that increases durability and modular designs that require less operating expertise.

** The most typical source, other than boilers, is a heat recovery steam generator (HRSG). Other sources of pressurized steam (> 400°F or so) include industrial waste heat, garbage incinerators, nuclear reactions, or geothermal energy.

*** The capital cost of a Trigen-Ewing backpressure steam turbine varies from about $700/kW for very small systems (50 kW) to $200/kW for large systems (over two megawatts). These costs do not include the expense of the steam system.

steam turbine from the exhaust heat of a gas turbine (combined cycle) is a form of heat recovery. Heat recovery methods from a steam turbine use exhaust or extraction steam with an economizer or air preheater. A steam turbine can also be used as a mechanical drive for a centrifugal chiller.

The amount and quality of the recovered heat is a function of the entering steam conditions and the design of the steam turbine. Exhaust steam from the turbine can be used directly in a process or for district heating. Alternatively, it can be converted to other forms of thermal energy including hot water or chilled water. Steam discharged or extracted from a steam turbine can be used in a single- or double-effect absorption chiller.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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