Determination of Thermodynamics Calculations of Precooling Systems during Hydro and Air Pre-cooling of Spinach

In this study, newly harvested spinach was cooled by air and hydro. Before precooling processes, products were weighed 5000 (± 10) g and placed into plastic boxes. Hydro and air precooling processes were continued until temperature degree of products were reached from 23°C of initial temperature value to 1°C of storage temperature value. Freon12 (R12) was used as cooler liguid in all precooling process. According to Rankine cooling cycle, all values of the corner points of cycle were calculated. Thus, pressure (P), volume (V), temperture (T), entalpy (h) and entropy (S) values were determined. Total heat of the cooling systems (heat removed from the cold environment) (Q4,1) was found in this study. Total heat values ranged between 1493.169 kj h -1 and 1829.331 kj h -1 for air pre-cooling and