Sprinkler performance for frost protection systems

Abstract

Frost protection using overhead sprinkler systems has become increasingly important in New Zealand horticulture since the mid-1970's. The reasons for this change and the problems created by the rapidity with which it occurred have been examined. The design requirements of sprinkler frost protection systems are considered. A performance parameter which is based on the percentage of the area receiving less than the minimum application rate necessary to achieve protection is introduced. Sprinkler performance can be measured by still-air distribution pattern tests and the resulting information can be used with computer programmes to predict system performance. The way in which these tasks have been done is described before presenting the results of many such analyses. This information should be of considerable benefit to designers of frost protection systems in New Zealand.