Ventilation Air Conditioning

Download Ashrae Pocket Guide for Air Conditioning, Heating, by Mildred Geshwiler (Editor) PDF

By Mildred Geshwiler (Editor)

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Extra resources for Ashrae Pocket Guide for Air Conditioning, Heating, Ventilation, Refrigeration: Inch-Pound Edition

Example text

It is made from other petroleum products, such as LPG or light distillate grade liquid fuels. Toxicity and Odour Some gases are toxic or poisonous and inhaling them may result in death. Carbon monoxide (CO) is one such gas and was a constituent of town gas as supplied in the days before conversion to natural gas in the gas distribution main. Fuel gases such as natural gas and propane, etc. are non-toxic as they do not contain any CO, but they can produce it if they are not fully burnt. , are odourless and an odorant, such as diethyl sulphide and ethyl butyl mercaptan, are added at the point of distribution to give the gas a recognisable smell.

The proportion of carbon to hydrogen varies depending on the hydrocarbon: methane has 1 carbon atom to 4 hydrogen atoms (CH4 ), whereas propane has 3 carbon atoms and 8 hydrogen atoms (C3 H8 ). Hydrocarbons react with oxygen in the presence of heat to undergo a chemical change, so producing a new by-product. When a piece of wood is burnt, we see that the wood, being a hydrocarbon, slowly disappears leaving nothing but a pile of ash. The process of combustion is misunderstood as being to destroy and consume.

Toxicity and Odour Some gases are toxic or poisonous and inhaling them may result in death. Carbon monoxide (CO) is one such gas and was a constituent of town gas as supplied in the days before conversion to natural gas in the gas distribution main. Fuel gases such as natural gas and propane, etc. are non-toxic as they do not contain any CO, but they can produce it if they are not fully burnt. , are odourless and an odorant, such as diethyl sulphide and ethyl butyl mercaptan, are added at the point of distribution to give the gas a recognisable smell.

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