Energy and peak-load conserving thermostat and method with controlled deadband
US5326026A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1993 |
| Grant date | Jul 5, 1994 |
| Priority date | — |
| Expiry date | Jul 27, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/1909
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A thermostat is disclosed for controlling a heating system, particularly a forced hot-air furnace, so as to improve fuel efficiency and decrease peak fuel load. The thermostat controls the length of fuel-on cycles, so that the heat exchanger of the furnace is not saturated. A wide deadband (approximately 3.degree. F.) for the thermostat further aids in lessening fuel usage. Forced air operation continues for a secondary-delivery period immediately after the thermostat turns the furnace off, thereby extracting additional heat from the heat exchanger and ductwork, but the length of the secondary-delivery period is limited so that the heat exchanger does not cool off beyond a predetermined amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.