Hot water supply system
US4935603A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1989 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | Feb 9, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B30/70
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A hot water supply system having a plurality of electric heaters arranged at vertically displaced positions in the hot water tank, and a controller for controlling the temperature of the water based on the signal supplied by a plurality of water-temperature sensors, by controlling the electric currents through the heaters in three different modes in such a way that the upper and lower heaters are turned on individually in a first mode; only the upper heater is turned on in a second mode; and only the upper heater is turned on at a low preset temperature in a third mode to prevent the water from freezing, supplying necessary and sufficient amount of hot water from the upper portion of the tank and feeding water from the lower portion of the tank, the system providing efficient electric current control of the heater depending upon the demands and ambient temperature conditions, thereby allowing efficient utilization of energy and making the hot water supply system superb.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.