| 摘要 |
heating systems including those using elongated electric heaters for heat-insulated pipes and containers. SUBSTANCE: coolant is heated by means of miscellaneous electric heaters where coolant has several zones each zone being heated by one or more heaters which are switched on and off during sequential and alternating heating and cooling periods. Ensured length of these periods is sufficient to maintain all portions of coolant at temperature not lower than chosen minimal value; these periods are computed by means of one microprocessor unit independently for each zone. EFFECT: improved heater control, reduced maintenance charges. 24 cl, 1 dwg, 1 tbl |
