Freeze protection for solar heating systems

Patent · Tue Jan 09 04:00:00 EST 1979

OSTI ID:6186783

Honikman, T C

Redundant freeze protection having primary and secondary protection modes is provided for a solar heating system, such as a solar water heating system, of the kind whose normal operation involves circulation of a heat transport liquid through a solar collector and a solar energy storage tank to store solar thermal energy in the tank. The primary protection mode is triggered in response to the collector liquid temperature, T/sub c/, dropping to a selected freeze protection trigger level, T/sub f/, and involves termination of liquid circulation through and draining of liquid from the collector. The secondary or back up freeze protection mode occurs upon failure of the collector drainage means to drain the collector in the primary mode in response to the freeze protection trigger condition T/sub c/ less than or equal to T/sub f/ and involves continued circulation of liquid through the collector and solar energy storage tank to warm the collector.

• Assignee: Allen K. Cooper
• Patent Number(s): US 4133338
• OSTI ID: 6186783
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140901* -- Solar Thermal Utilization-- Space Heating & Cooling
140907 -- Solar Thermal Utilization-- Water Heating
APPLIANCES
DESIGN
DRAIN-DOWN SYSTEMS
ELECTRIC APPLIANCES
ENERGY STORAGE
FREEZE PROTECTION
GAS APPLIANCES
HEAT STORAGE
HEATERS
HEATING SYSTEMS
OPERATION
SOLAR COLLECTORS
SOLAR HEATING SYSTEMS
SOLAR WATER HEATERS
STORAGE
WATER HEATERS