TABLE OF CONTENTS The indoor work environment must be controlled and regulated to provide the occupants with a healthy and productive work area. The comfort zone for people in a work environment depends upon two factors: heat/air conditioning and humidity. The ideal indoor temperature should range from 65 degrees F (18 degrees C) to 75 degrees F (24.5 degrees C) and relative humidity levels should be between 30 and 50%. Basic HVAC systems all have common components: heat and/or cooling sources, a method by which the heating or cooling is distributed, terminal devices to disperse the heat or cooling, and a means to control the equipment.
Scotch Marine - The Classic Firetube Boiler
The Scotch Marine style of boiler has become so popular in the last 40 years that it frequently is referred to simply as a firetube boiler. Firetube boilers are available for low or high pressure steam, or for hot water applications, Firetube boilers are typically used for applications ranging from 15 to 1500 horsepower. A firetube boiler is a cylindrical vessel, with the flame in the furnace and the combustion gases inside the tubes. The furnace and tubes are within a larger vessel, which contains the water and steam.
The firetube construction provides some characteristics that differentiate it from other boiler types. Because of its vessel size, the firetube contains a large amount of water, allowing it to respond to l changes with minimum variation in steam pressure.
Stream pressure in a firetube boiler...
