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Title Greenhouse window U-factors under field conditions
Creator/Author Klems, J.H.
Publication Date1997 Jun 01
OSTI IdentifierOSTI ID: 674940 ; DE98054169
Report Number(s)LBNL--40448; DA--374;CONF-980123--
DOE Contract NumberAC03-76SF00098
Resource TypeConference
Resource Relation1998 ASHRAE winter meeting, San Francisco, CA (United States), 17-21 Jan 1998 ; PBD: Jun 1997
Research OrgLawrence Berkeley National Lab., Environmental Energy Technologies Div., Berkeley, CA (United States)
Sponsoring OrgUSDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States)
Subject32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION ; WINDOWS; U VALUES; FIELD TESTS; HEAT TRANSFER; COMPUTERIZED SIMULATION
Description/Abstract Field measurements of U-factor are reported for two projecting greenhouse windows, each paired with a picture window of comparable insulation level during testing. A well-known calorimetric field test facility was used to make the measurements. The time-varying U-factors obtained are related to measurements of exterior conditions. For one of the greenhouse windows, which was the subject of a published laboratory hotbox test and simulation study, the results are compared with published test and simulation data and found to be in disagreement. Data on interior and exterior film coefficients are presented, and it is shown that the greenhouse window has a significantly lower interior film coefficient than a conventional window under the same interior conditions. This is advanced as a possible explanation of the disagreement.
Country of PublicationUnited States
LanguageEnglish
Format15 p. ; PL:
Availability OSTI as DE98054169
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System Entry Date2001 May 06
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