| 单词 | degree-day |
| 释义 | degree-dayor de·gree day[ dih-gree-dey ] / dɪˈgriˌdeɪ / noun Engineering.one degree of departure, on a single day, of the daily mean temperature from a given standard temperature. Abbreviation: dd Compare cooling degree-day, growing degree-day, heating degree-day. Origin of degree-dayFirst recorded in 1925–1930 Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for degree-day (1 of 2)degree day nouna day on which university degrees are conferred British Dictionary definitions for degree-day (2 of 2)degree-day nouna unit used in estimating fuel requirements in heating buildings. It is equal to a fall of temperature of 1 degree below the mean outside temperature (usually taken as 18°C) for one day Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for degree-daydegree-day A unit of measurement equal to a difference of one degree between the mean outdoor temperature on a certain day and a reference temperature. The unit is most often used in estimating the energy needs for heating or cooling a building (for example, heating degree-days and cooling degree-days). Originally, degree-days were used to determine the relationship between temperature and plant growth. The term continues to be used in life sciences as a measure of upper- and lower-temperature limits for organisms. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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