Solar energy transfer system with protection against freezing
US3986489A · kind A · utility
Inventor
Key dates
| Filing date | Apr 10, 1975 |
| Grant date | Oct 19, 1976 |
| Priority date | — |
| Expiry date | Apr 10, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1189
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system for transferring thermal energy from a solar energy collector to a storage tank by pumping water from the tank through the heat exchanger and back into the tank. Two temperature-sensitive thermistors sense respectively the temperature of the water as leaving the heat exchanger or as being held therein, and the temperature of the water in the tank or as leaving the tank; these thermistors are included in bridge circuits which provide control signals representing the collector and tank temperatures and the differences of these temperatures for controlling water circulation, collector heating and/or dumping of the water, for collecting thermal energy and for preventing the circulation from freezing or boiling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.