Product Pull-Down Load
Heat to bring product to storage: above freezing Q = m cp deltaT; for a freezer add the latent heat of fusion and the frozen sensible. 2000 lb produce, cp 0.9, 80->35 F, 24 hr -> 81,000 Btu, 3,375 Btu/hr; freezing the same to 0 F -> 358,800 Btu (latent dominates). The product property tables govern.
Formula and source
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); rate = Q / hours.
The product pull-down (cooling and freezing) load with the latent heat of fusion, from ASHRAE Refrigeration, by name.
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