Theoretical and experimental studies on sequential freezing solar water heater

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Solar Energy (Journal of Solar Energy Science and Engineering); (United States)

DOI:https://doi.org/10.1016/0038-092X(94)90474-X· OSTI ID:7046669

Xinian, Jiang; Zhen, Tao; Junsheng, Lu; Hongchuan, Ge ^[1]

---

1. Beijing Solar Energy Research Institute (China)

This article presents the principle of using sequential freezing for the purpose of freeze protection in a solar water heater. Sequential freezing is accomplished by maintaining a temperature gradient across the collector so that water is squeezed out of the collector rather than being trapped by ice at the ends of the tubes. The authors give the mathematical models of tubular sequential freezing, compare the predicted results of models with the measured data, and investigate the influences of various factors on the tubular sequential freezing state with the model. A series of experiments show that a solar water heater designed according to the principle of sequential freezing can operate effectively in winter without drain-down, electricity, and heat exchanger systems.

• OSTI ID: 7046669
• Journal Information: Solar Energy (Journal of Solar Energy Science and Engineering); (United States), Journal Name: Solar Energy (Journal of Solar Energy Science and Engineering); (United States) Vol. 53:2; ISSN SRENA4; ISSN 0038-092X
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140907* -- Solar Thermal Utilization-- Water Heating
APPLIANCES
EQUIPMENT
FREEZE PROTECTION
HEATERS
MATHEMATICAL MODELS
SOLAR EQUIPMENT
SOLAR WATER HEATERS
TEMPERATURE GRADIENTS
WATER HEATERS