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Title: Passively operated spool valve for drain-down freeze protection of thermosyphon water heaters. Final technical report

Abstract

The work done to extend the existing drain-down valve technology to provide passive drain-down freeze protection for thermosyphon-based solar water heaters is described. The basic design of the existing valve model is that of a spool valve, employing a cylindrical spool which moves axially in a mating cartridge to open and close o-rings at the two operating extremes (drain and operate) to perform the valving function. Three passive actuators to drive the basic valving mechanism were designed, fabricated, and tested. Two piping configurations used to integrate the spool valve with the thermosyphon system are described, as are the passive actuators. The three actuator designs are: photovoltaic driven, refrigerant-based bellows, and heat motor cable-drive designs. Costs are compared for the alternative actuator designs, and operating characteristics were examined for the thermosyphon system, including field tests. The market for the valve for thermosyphon systems is then assessed. (LEW)

Publication Date:
Research Org.:
Sunspool Corp., Palo Alto, CA (USA)
Sponsoring Org.:
USDOE
OSTI Identifier:
6718813
Report Number(s):
DOE/CS/30533-1
ON: DE83001015
DOE Contract Number:  
FC02-80CS30533
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of document are illegible
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; DRAIN-DOWN SYSTEMS; ACTUATORS; VALVES; SOLAR WATER HEATERS; THERMOSYPHONS; BELLOWS; DESIGN; FABRICATION; FIELD TESTS; FREEZE PROTECTION; MARKETING RESEARCH; PERFORMANCE TESTING; SOLAR CELL ARRAYS; THERMAL EXPANSION; APPLIANCES; CONTROL EQUIPMENT; EQUIPMENT; EXPANSION; FLOW REGULATORS; HEATERS; MECHANICAL STRUCTURES; SOLAR EQUIPMENT; TESTING; WATER HEATERS; 140907* - Solar Thermal Utilization- Water Heating

Citation Formats

. Passively operated spool valve for drain-down freeze protection of thermosyphon water heaters. Final technical report. United States: N. p., 1982. Web. doi:10.2172/6718813.
. Passively operated spool valve for drain-down freeze protection of thermosyphon water heaters. Final technical report. United States. doi:10.2172/6718813.
. Fri . "Passively operated spool valve for drain-down freeze protection of thermosyphon water heaters. Final technical report". United States. doi:10.2172/6718813. https://www.osti.gov/servlets/purl/6718813.
@article{osti_6718813,
title = {Passively operated spool valve for drain-down freeze protection of thermosyphon water heaters. Final technical report},
author = {},
abstractNote = {The work done to extend the existing drain-down valve technology to provide passive drain-down freeze protection for thermosyphon-based solar water heaters is described. The basic design of the existing valve model is that of a spool valve, employing a cylindrical spool which moves axially in a mating cartridge to open and close o-rings at the two operating extremes (drain and operate) to perform the valving function. Three passive actuators to drive the basic valving mechanism were designed, fabricated, and tested. Two piping configurations used to integrate the spool valve with the thermosyphon system are described, as are the passive actuators. The three actuator designs are: photovoltaic driven, refrigerant-based bellows, and heat motor cable-drive designs. Costs are compared for the alternative actuator designs, and operating characteristics were examined for the thermosyphon system, including field tests. The market for the valve for thermosyphon systems is then assessed. (LEW)},
doi = {10.2172/6718813},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {4}
}