| 摘要 |
PROBLEM TO BE SOLVED: To provide a circulation eco-type roof snow melting device which has a function of reducing power supply facilities of an electric power company and efficiently melting the snow accumulated during a winter period without removing it by manpower by dividing and reducing a base capacity of a main-circuit short-circuit breaker and a heater switch capacity without energizing all the heaters of the electric roof snow melting device at the same time. SOLUTION: A photoelectric switch used for snow detection is attached to every heater block of the roof snow melting device, and a snow guard angle is placed so that it partitions the heater block. Then each of the heater blocks is provided with an interlock function so that it cannot be energized at the same time. The heater blocks are energized in turn from the eave, and the snow is melted. Then the base capacity of the main-circuit short-circuit breaker and the heater switch capacity can be divided and reduced. Thus, the power supply facilities of the electric power company can be reduced, and the snow can be efficiently melted by the function. COPYRIGHT: (C)2009,JPO&INPIT
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