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NCJ Number: 66023 Find in a Library
Title: M FACTOR - THE USE OF MASS TO SAVE ENERGY IN THE HEATING AND COOLING OF BUILDINGS
Author(s): ANON
Corporate Author: Masonry Industry Cmtte
United States of America
Date Published: Unknown
Page Count: 18
Sponsoring Agency: Masonry Industry Cmtte
Format: Document
Language: English
Country: United States of America
Annotation: THIS STUDY WAS DEVELOPED TO QUANTIFY THE SUPERIOR THERMAL PERFORMANCE OF MASONRY WALLS AND TO PROVIDE A METHOD BY WHICH DESIGNERS COULD USE THIS DIFFERENTIAL IN BUILDING AND HEATING DESIGN.
Abstract: THE STUDY INVOLVED AN ANALYSIS OF VARIOUS WALLS IN 10 CLIMATIC CONDITIONS USING WEATHER TAPES FROM 10 CITIES COVERING A 10-YEAR PERIOD. MASONRY ENGINEERS SPECIFIED 10 WALLS FOR THE STUDYING RANGING IN MASS FROM 4 TO 116 POUNDS PER SQUARE FOOR AND WITH 'U,' OR (WALL HEAT-TRANSFER RESISTANCE,) VALUES RANGING FROM 0.07 TO 0.27. THERMAL PERFORMANCE OF EACH WALL WAS ANALYZED IN EACH OF THE 10 CITIES AND IN 8 ORIENTATIONS--NORTH, NORTHEAST, EAST, SOUTHEAST, SOUTH, SOUTHWEST, WEST, AND NORTHWEST--FOR 24 HOURS A DAY. A YEAR WHICH MOST CLOSELY TYPIFIED ALL 10 YEARS WAS SELECTED AS THE DESIGN YEAR. ONE DAY WAS STATISTICALLY DEVELOPED AND SELECTED TO TYPIFY EACH MONTH OF THE DESIGN YEAR. THE STUDY CONCLUDED THAT THE TRADITIONAL METHOD OF CALCULATING HEAT LOSS DID NOT CONSIDER ALL THE VARIABLES INVOLVED IN HEAT FLOW THROUGH BUILDING ENVELOPES AND THAT THIS METHOD ASSUMED A STEADY-STATE HEAT FLOW THAT DISREGARDED THE EFFECTS OF MASS. THE COMBINED INFLUENCE OF RESISTANCE AND CAPACITY INSULATION ACTUALLY DETERMINED BUILDING REGULATION OF HEAT GAIN AND LOSS. ALSO, THE CAPACITY INSULATION OF A BUILDING ELEMENT DEPENDED LARGELY ON THE WEIGHT OR MASS OR THE ELEMENT--THE HEAVIER THE ELEEMNT, THE MORE HEAT IT COULD RETAIN. FINALLY, THE 'M' FACTOR THAT WAS DEVELOPED--A DIMENSIONLESS CORRECTION FACTOR--OFFERED A SIMPLE APPROACH FOR A REALISTIC PEAK LOAD CALCULATION. TABULAR DATA INCLUDING CHARTS AND GRAPHS, AN ARTICLE ON THE 'M' FACTOR, AND AN 'M' FACTOR BUILDING CODE REFERENCE ARE PROVIDED. (AOP)
Index Term(s): Energy conservation; Energy requirements; Energy resources; Evaluation techniques
To cite this abstract, use the following link:
http://www.ncjrs.gov/App/publications/abstract.aspx?ID=66023

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