ISHS Acta Horticulturae 46: Symposium on Greenhouse Design and Environment
DETERMINATION OF GLASSHOUSE HEAT REQUIREMENTS FROM TEMPERATURE AND WIND RECORDS |
| Authors: | T. O'Flaherty, R. Cochran |
| Abstract:
Glasshouse heat requirements have been estimated from an analysis of hourly readings of temperature and windspeed. The readings cover the months November to March in five successive winters, at three meteorological stations in England and three in Ireland. The analysis examines the heating system capacity needed in each region to meet peak demand to within specified limits. It proposes a criterion for evaluating the external design temperature and thermal transmittance (U-value)to be used in different regions in the design of glasshouse heating systems. The criterion is used to derive values of these quantities for the six places included in the study. Winter fuel consumption for the six regions is also compared. The results demonstrate the important influence of wind on glasshouse heat demand. Winter temperatures are generally lower in England than in Ireland, but greater wind speeds in Ireland tend to cancel this advantage. | |
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