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In the United States, Underwriters Laboratories' UL 1278 [11] (for portable electric space heaters) and UL 1042 [12] standards (for portable and fixed baseboard electric heaters) certify heater safety. Although the General Services Administration had Specification W-H-193 [13] for
The Herah company was in the business of manufacturing electric wall heaters, electric fireplace logs, portable heaters, and fluorescent lighting specialties... They had employed fewer than a dozen people. [18] Business growth continued to fuel expansion. An additional 6000 s.f. of warehouse space was construction in 1952. [19]
During the ventilation cycle, sunlight stores heat in the thermal mass and warms the air channel causing circulation through vents at the top and bottom of the wall. During the heating cycle the Trombe wall radiates stored heat. [11] Solar roof ponds for solar heating and cooling were developed by Harold Hay in the 1960s.
A micro-CHP system usually contains a small heat engine as a prime mover used to rotate a generator which provides electric power, while simultaneously utilizing the waste heat from the prime mover for an individual building's space heating and the provision of hot domestic water. [2]
Two 6000 watt motor driven autotransformer dimmers, used for theatre auditorium lighting The coil-rotation transformer used a fixed-position electromagnet coil in conjunction with a variable-position coil to vary the voltage in the line by varying the alignment of the two coils.
Virtually all electric power stations use three-phase electrical generators to produce alternating current (AC) electric power at a frequency of 50 Hz or 60 Hz. Large companies or institutions may have their own power stations to supply heating or electricity to their facilities, especially if steam is created anyway for other purposes.