Temperature control of chill water and steam in heating, ventilation, air conditioning (HVAC) systems
US4187543A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1977 |
| Grant date | Feb 5, 1980 |
| Priority date | — |
| Expiry date | Oct 25, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/20
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Apparatus for controlling the discharge temperature of thermal fluid presented from a common thermal source to one or more HVAC systems in a network, each HVAC controlling the volume of thermal fluid circulating therethrough by regulating the valve position of HVAC valve apparatus over a valve position range from a full closed position to a full open position in dependence on the thermal energy level required by one or more temperature regulated living spaces associated with each HVAC, the apparatus including electronic processing means in combination with dedicated temperature and valve position sensing apparatus for providing actual position signals for each fluid valve apparatus and an actual source discharge temperature signal, the electronic processing means determining the magnitude of the greatest thermal energy demand within a short term interval in dependence on the most open of the actual valve position signals and providing modulation of the source discharge temperature over the short term interval in dependence on the magnitude of the greatest thermal energy demand.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.