TY - GEN
T1 - On the selection of percentile criteria for greenhouse lighting system design
AU - Ciolkosz, Daniel Edward
PY - 2008/1/1
Y1 - 2008/1/1
N2 - An investigation is presented of the relationships between various greenhouse lighting performance parameters and the associated daylight percentile (commonly known as "percentile exceedence"). Analyses were carried out on the National Solar Radiation Database (NSRDB) from the National Renewable Energy Laboratory to find the most suitable percentile value to correspond to the lowest running average Daily Daylight Integral (DDI) for a site, and to the lowest monthly average. The modeled production of hydroponic lettuce was also analysed at different percentiles. Results indicate that the most suitable percentile for a running average criterion is equal to P = 101.0 - 0.4779 L, where P equals the percentile and L equals the length of the running average in days. The minimum monthly DLI corresponds to a percentile of 83.7%. Percentiles associated with the modelled growth of hydroponic lettuce varied from 86 to 99% depending on required mass of the crop. These results can be used by designers to select the most appropriate design percentile for a facility, and in turn to design an optimum supplementary lighting system for a given greenhouse.
AB - An investigation is presented of the relationships between various greenhouse lighting performance parameters and the associated daylight percentile (commonly known as "percentile exceedence"). Analyses were carried out on the National Solar Radiation Database (NSRDB) from the National Renewable Energy Laboratory to find the most suitable percentile value to correspond to the lowest running average Daily Daylight Integral (DDI) for a site, and to the lowest monthly average. The modeled production of hydroponic lettuce was also analysed at different percentiles. Results indicate that the most suitable percentile for a running average criterion is equal to P = 101.0 - 0.4779 L, where P equals the percentile and L equals the length of the running average in days. The minimum monthly DLI corresponds to a percentile of 83.7%. Percentiles associated with the modelled growth of hydroponic lettuce varied from 86 to 99% depending on required mass of the crop. These results can be used by designers to select the most appropriate design percentile for a facility, and in turn to design an optimum supplementary lighting system for a given greenhouse.
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M3 - Conference contribution
AN - SCOPUS:63149154015
SN - 9781605605364
T3 - American Society of Agricultural and Biological Engineers Annual International Meeting 2008, ASABE 2008
SP - 7709
EP - 7721
BT - American Society of Agricultural and Biological Engineers Annual International Meeting 2008, ASABE 2008
PB - American Society of Agricultural and Biological Engineers
T2 - American Society of Agricultural and Biological Engineers Annual International Meeting 2008
Y2 - 29 June 2008 through 2 July 2008
ER -
