Product Pull-Down Time
Hours to pull product down from the refrigeration capacity dedicated to product load (hours = Q / capacity), the inverse of Product Pull-Down Load. Flags when the time exceeds the design window.
Formula and source
hours = Q / capacity_btuh, with Q from the product pull-down relation (above freezing Q = m cp (t_enter - t_storage); freezing Q = m cp_above (t_enter - t_freeze) + m hif + m cp_below (t_freeze - t_storage)). The inverse of product-pull-down-load (which returns rate = Q / hours).
The product pull-down time from the sensible-plus-latent cooling load and the available capacity, from ASHRAE Refrigeration, by name.
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