An Improved Solar Cooling System for Date Safety and Storage under Climate of the Maghreb
Table 3
Stored goods conditions and cold room features.
Cold room calculation
Stored goods
Storage conditions
0°C/RH 85%
Freezing point
-1°C
Specific heat (PT/NT)
3.53/1.85 kJ/(kg·K)
Latent heat
266.8 kJ/kg
Cold room features
Ambient conditions
37.5°C/20.2°C WT
Cold room internal volume
48 m3
Internal sizes
Isolation thickness
150 mm
Heat transmission rate
0.025 W/(m·K)
(1) Goods refrigeration loads
537840 kJ/day
Goods rotation
1200 kg at 25°C each 24 hours
105840 kJ/day
Packaging cooling
96000 kg/day
432000 kJ/day
(2) Transmission heat gain
45092 kJ/day
Walls
31035 kJ/day
Roof
6835 kJ/day
Floor
6424 kJ/day
Door
798 kJ/day
(3) Air renewal heat gain
31908 kJ/day
Air renewal rate
(4) Internal loads heat gain
155779 kJ/day
People
272 W
Lighting
540 W
Defrosting
198 W
Evaporator fans
793 W
Total cooling needs
770619 kJ/day
Security margin
10%
Compressor operation time per day
24 h
Cooling capacity needed
9811 W
Recommended unit (horizontal version series-SH-QF)
MSF-QF 9136
Split units with silent condensing unit and cubic evaporating unit, designed for the preservation of generic products at positive or negative temperature in or negative temperature in medium size cold rooms. The condensing units are designed to be installed outdoors, with too low noise emission level due to silent design and tropicalized battery. MSF-QF 9136 owns compressor with 400 V-III and frigorific powers of 10260, 12300, 14500, and 17050 W for volumes of cooling compartments of 160, 220, 320, and 500 m3, respectively [55].
