Aqueous propylene-glycol concentrations for the freeze protection of thermosyphon solar energy water heaters

Journal Article · Tue Jan 01 00:00:00 EST 1991 · Solar Energy (Journal of Solar Energy Science and Engineering); (United States)

DOI:https://doi.org/10.1016/0038-092X(91)90031-Q· OSTI ID:5964090

Norton, B ^[1]; Edmonds, J E.J. ^[2]

---

1. Univ. of Ulster, Newtownabbey (Ireland)
2. Energy Control Consultants Ltd., Buckinhamshire (England)

Using a validated dynamic simulation model, the thermal performance of an indirect thermosyphon solar energy water heater was examined. The heat transfer fluids employed were aqueous solutions of propylene glycol. The effect of varying the glycol concentration on the hot water output and efficacy of freeze protection was determined for a specific pattern of hot water withdrawal and weather for the temperature maritime climate of London, England. The heat output is compared with that of a drain-down direct system.

• OSTI ID: 5964090
• Journal Information: Solar Energy (Journal of Solar Energy Science and Engineering); (United States), Vol. 47:5; ISSN 0038-092X
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
PASSIVE SOLAR WATER HEATERS
FREEZE PROTECTION
ANTIFREEZE
COMPUTERIZED SIMULATION
GLYCOLS
THERMOSYPHONS
UNITED KINGDOM
ALCOHOLS
APPLIANCES
DEVELOPED COUNTRIES
EQUIPMENT
EUROPE
HEATERS
HYDROXY COMPOUNDS
ORGANIC COMPOUNDS
SIMULATION
SOLAR EQUIPMENT
SOLAR WATER HEATERS
WATER HEATERS
140907* - Solar Thermal Utilization- Water Heating