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A computer model is described for calculating energy consumption and moisture loss. The model uses data from an actual potato store in the Cambridge region of the UK. The differences between actual and calculated power consumption values for 1989-1990 and 1990-1991 seasons are +1 0% and -2 3% respectively. For the whole storage season, the weight losses are 5 09% and 5 02% for the 1989-1990 and 1990-1991 seasons, respectively.NOTATIONA door Door area (m 2 )A pk pth room's kth surface area (m 2 )A pr Stored product total surface area (m 2 )c p-pk Specific heat of packaging material (J/kg K)c p-pr Specific heat of product (J/kg K)c p-w Specific heat of water (J/kg K)C Tracer-gas concentration after time t (ppm)C ir Rate of fresh-air change per minute (litre/min)C 1 Initial tracer gas concentration (uniformly mixed) (ppm)d room Room air density (kg/m 3 )F(t) Respiration heat (W/kg)h amb Enthalpy of ambient air (J/kg)h cor Enthalpy of corridor air (J/kg)h fr Latent heat of freezing (J/kg)h in Enthalpy of inlet evaporator air (J/kg)h out Enthalpy of outlet evaporator air (J/kg)h room Enthalpy of room air (J/kg)H door Door height (m)K Variable dependent on T room (°C)K a Air-film mass-transfer coefficient (kg/s m 2 kPa)K pr Overall mass-transfer coefficient (kg/s m 2 kPa)K s Skin mass-transfer coefficient (kg/s m 2 kPa)m Number of working daysm ac-d Daily amount of moisture that enters the cold store with infiltration through doors (kg/day)m ac-w Daily amount of moisture that enters the cold store with infiltration through walls (kg/day)m daf Daily air-flow rate (kg/day)m dcm Daily condensed-moisture rate (kg/day)m hm Daily amount of water for humidifying (kg/day)m j Amount of product that enters the cold store during jth day (kg)m pal Amount of product that enters via one pallet (kg)m pm Amount of packaging material that enters with one pallet (kg)m pr Daily amount of moisture produced by product respiration (kg/day)n Number of cold store roomsn j Amount of product that goes from the cold store on jth day (kg)p a Water-vapour pressure of surrounding air (kPa)p s Water-vapour pressure at evaporating surface (kPa)q lt Lighting power of room (W)q p Release rate of heat from persons working in cold room (W)q(T ij ) Function of respiration heat and product temperature (W)Q Rate of fresh-air change of the store (m 3 /min)Q AC-D Air-change load through doors (W)Q AC-W Air-change load through walls (W)Q DEF Defrost load (W)Q DFP Designed fan-power (W)Q DRC Designed refrigeration capacity (W)Q DRL Daily refrigeration load (W)Q F Fan load (W)Q HM Humidifying load (W)Q L Lighting heat-gain load (W)Q P Personnel heat-gain load (W)