video record
Media not available in the Digital Archive
Description
An outline of the power cycle of a coal fired power station, focussing on the pressure/volume cycle of the water substance between boiler, turbine and condenser. The pv diagram is explained, and us...ed as a theoretical basis. The workings of a cooling tower are explained. High pressure and lower pressure turbine blades are looked at briefly, and some final comments are made while looking at a model of Watts Lapp engine.
Metadata describing this Open University video programme
Module code and title: T100, The man-made world: a foundation course
Item code: T100; 20
First transmission date: 04-06-1972
Published: 1972
Rights Statement: Rights owned or controlled by The Open University
Restrictions on use: This material can be used in accordance with The Open University conditions of use. A link to the conditions can be found at the bottom of all OU Digital Archive web pages.
Duration: 00:25:00
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Producer: Edward Goldwyn
Contributors: Geoffrey Holister; Andrew Porteous
Publisher: BBC Open University
Keyword(s): Boiler; Coal fired power station; Condenser; Cooling tower; High & low pressure turbine blades; Power cycle; Pressure/volume cycle; Turbine; Water substance; Watts Lapp engine
Footage description: Aerial and ground shots of a large coal coal fired electric power station. Shots of railway cars delivering coal to the station. Commentary gives a brief description of power output and amount of coal needed to run the station. Holister briefly discusses the role of steam in the generation of electric power. Holister with a simplified diagram of a coalburning power station. He pointed out the circulatory system and briefly discusses it. A. Porteous explains the circulatory system in detail with the aid of a diagram. He uses a closed circuit type as his example. A. Porteous explains the use of a PVT diagram. He shows a PVT diagram for an ideal gas. He, then shows a simplified diagram (reduced to 2 dimensions). As power station circulatory systems use water, Porteous discusses the problem posed by the changing phases of water. He shows a PVT diagram for water. Porteous sketches a PV diagram for the liquid and vapour phases of water and then plots the changes in phase as they happen in the circulatory cycle. Holister with a scale model of the circulatory system of a power station. He examines and discusses: 1 . The boiler section.; 2. The rest of the system. Shots of: Pipe work for circulatory system being installed at power station; Steel drum, which separates water and steam, being installed. Turbine hall of a power station. Shot of turbine blades, both low and high pressure. A. Porteous with low and high pressure blade segments. He uses them as aids in a discussion of volumetric changes of water - steam. He also discusses turbine blade erosion problem caused by impact of water droplets (excessive moisture in the steam). Porteous again sketches a PV diagram for water and uses it to aid his discussion of superheating steam to eliminate excess moisture. He also explains the process of resuperheating and why this is needed. Porteous with diagram of a circulating system. He adds turbines to the diagram and explains super and resuperheating processes. Shot of an actual condenser in a power station. Porteous gives reasons for using closed circulating systems. Shots of cooling towers, both inside and out. The technology of cooling towers is explained. A diagram shows how the cooling tower works. Porteous with a working model of a Watt Lapp early steam engine. He points out several parts of the engine and explains their function.
Master spool number: 6LT/70242
Production number: 00521_2509
Videofinder number: 2163
Available to public: no