| Description |
6 p. : digital, PDF file |
| Series |
NREL/CP ; 550-39722
|
| System Details |
Mode of access: Internet from the NREL web site. |
| Note |
Title from title screen (viewed on July 31, 2007). |
|
"May 2006." |
|
"To be presented at Solar 2006, Denver, Colorado, July 8-13, 2006." |
| Summary |
With the goal of extending the geographical market for passive solar water heaters northward, a room-air natural convection loop (NCL) was investigated for providing freeze protection for supply/return pipes carrying pressurized domestic water through unconditioned space. An NCL model was developed based upon balancing buoyancy and friction in the loop. Calibration factors (Cfric,Cht-trsf) were introduced to scale calculations and account for un-modeled details and correlation bias. An NCL prototype was constructed with 2", 4", and 8" diameters. Least-square regression on data from the 4" diameter duct yielded (Cfric,Cht-trsf) = (2.05, 1.8). The calibrated model was used to provide site-specific design guidance, and to estimate energy losses with and without a thermostatic control to stop flow whenever Tamb > 0 C. |
| Subject |
Solar water heaters -- Prevention.
|
| Added Author |
Burch, Jay D.
|
|
National Renewable Energy Laboratory (U.S.)
|
| Gpo Item No. |
0430-P-04 (online) |
| Sudoc No. |
E 9.17:NREL/CP-550-39722 |
|
