JPS5575156A - Hot-water heating system - Google Patents

Abstract

PURPOSE: To increase a stability of a control and decrease a transitional temperature variation by controlling most of control outputs with an open loop while controlling only a compensating output to coincide a hot-water temperature with a preset value with a closed loop.

CONSTITUTION: Feed-water is sent from a water feeding pipe 2 into a faucet 6 through a heat-exchanger 1. Gas, supplied from a gas pipe 3 through a proportional control valve 4, is burnt at a burner 5. A temperature of discharged hot-water is detected by a temperature sensor 7 and is compared in a control circuit 8 with a preset temperature preset by a temperature presetter 9, subsequently, the proportional control valve 4 is activated in accordance with a difference thereof. Using together with a closed loop control, activating the said control valve 4, a feed- water temperature is detected by a temperature sensor 11 and a discharged quantity of the hot-water is detected by a flow sensor 10, then, a relation between the temperature presetter 9 and these detected values are processed in a control circuit 14, thereafter, a result of an operation of a value (the preset temperature - the feed-water temperature) X the discharged quantity of hot-water is output, and thereby, an open loop control for activating the proportional contral valve 4 is effected.

COPYRIGHT: (C)1980,JPO&Japio