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In 1949, John H. Williams, a nephew of the founders, together with his brother Charles Williams and David's son David Williams Jr., bought the business from the founders; John H. Williams remained as president of the company until 1971 and CEO until 1979. [2] The company went public in 1957 under the Williams Brothers name.
A gas heater is a space heater used to heat a room or outdoor area by burning natural gas, liquefied petroleum gas, propane, or butane. Indoor household gas heaters can be broadly categorized in one of two ways: flued or non-flued, or vented and unvented .
In the 1970s it converted about 50% of the UK's houses from town gas to natural gas. [3] It also diversified into offshore oil and gas under the leadership of Tony Hawken and Ray Daniels. [4] The name of the company changed from William Press & Son to William Press Group in 1981. [5] It merged with Leonard Fairclough & Son in 1982 to form AMEC. [1]
The fourth category of furnace is the high-efficiency condensing gas furnace. High efficiency condensing gas furnaces typically achieve between 90% and 98% AFUE. [3] A condensing gas furnace includes a sealed combustion area, combustion draft inducer and a secondary heat exchanger. The primary gain in efficiency for a condensing gas furnace, as ...
The heat is then transferred into the mold by convection. As the electrical energy heats the heating elements that then heat the mold in a secondary manner, the process is called indirect resistance heating. Advantages are high achievable temperatures, independent from the conductivity of the mold and independent from heat and pressure.
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Extracts heat from the environment, using either the ground or air as the source, via the refrigeration cycle. Requires less energy than electric resistance heating and possibly more efficient than fossil fuel fired furnaces (gas/oil/coal). Air source types may not be suitable for cold climates unless used with backup (secondary) source of heat.
The residual heat will exit the furnace as flue gas. [1] These are designed as per international codes and standards the most common of which are ISO 13705 (Petroleum and natural gas industries — Fired heaters for general refinery service) / American Petroleum Institute (API) Standard 560 (Fired Heater for General Refinery Service).