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He defended his PhD in law on the relationships between law and sciences on December 15, From until he also held a part-time position of lecturer at the Faculty of Law of the Erasmus University Rotterdam where he was in charge of the coordination of research and taught 'Philosophy of law'.

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History[ edit ] The first gas heater made use of the same principles of the Bunsen burner invented in the previous year.

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It was first commercialized by the English company Pettit and Smith in The flame heats the air locally. This heated air then spreads by convectionthus heating the whole room.

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Today the same principle applies with outdoor patio heaters or "mushroom heaters" which act as giant Bunsen burners. Beginning in the burner's flame was used to heat a structure made of asbestosa design patented by Sigismund Leoni, a British engineer. Later, fire clay replaced the asbestos because it is easier to mould.

Modern gas heaters still work this way although using other refractory material. Modern gas heaters have been further developed to include units which utilize radiant heat technology, rather than the principles of the Bunsen burner.

This form of technology does not spread via convection, but rather, is absorbed by people and objects in its path. This form of heating is particularly useful for outdoor heatingwhere it is more economical than heating air that is free to move away.

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Flued heaters[ edit ] Flued heaters would always be permanently installed. The flueif properly installed with correct overall height, should extract most heater emissions.

A correctly operating flued gas heater is usually safe. Non-flued heaters[ edit ] Another example of a non-flued gas heater, running on natural gas.

Non-flued heaters — also known as unvented heaters, ventfree heaters or flueless fires may be either permanently installed or portable, and sometimes incorporate a catalytic converter.

There must be adequate ventilation, they must be kept clean, and they should always be switched off before sleeping.

If operating correctly the main emissions of a non-flued gas heater are water vapour and carbon dioxide and nitrogen dioxide. Operation[ edit ] Home gas heating controls cycle using a mechanical or electronic thermostat.

Gas flow is actuated with a valve. Ignition is by electric filament or pilot light. Flames heat a radiator in the air duct but outside the flue, convection or a fan may distribute the heat.Door Wilbert Beelen.

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Gas heater - Wikipedia