Download - Cold storage ppt pragati
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PRAGATI SINGHAM
DESIGN OF
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Contents
Introduction Considerations Designing aspects Problems associated with cold storage Refrigeration system Heat load calculations References
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Introduction
Cold storage facility for perishable products under controlled conditions
A cold storage unit incorporates a refrigeration system to maintain the desired room environmental conditions
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Classification
Based on storage conditions Short term or temporary (7-10 days) Long term (6-8 months) Frozen storage (years)
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Types of cold storage
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Specific considerations
Uniform temperatures Length of air blow and impingement on stored
products Effect of relative humidity Effect of air movement Controlling ventilation systems, if necessary. Product entering temperature Expected duration of storage Required product outdoor temperature Transportation in and storage area
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Cold storage design
1. Selection of site2. Orientation and building form3. Size4. Space requirement5. Design of building6. Thermal insulation7. Refrigeration system for cold store8. Heat Load calculation
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Cold storage design (Contd..)
1. Selection of site
2. Orientation and building form N-S direction W-E walls should have good plantation Surface to volume ratio less
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Cold storage design (Contd..)
3. Size
Volume of product to storeProduct containers (boxes, hampers, buckets)Volume required per containerSpace for mechanical or manual operationLateral and head spaceAvailable site space
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Cold storage design (Contd..)
V = v(C+S)Where,
→ V is the total volume needs in cubic feet.→ v is the volume occupied by one product
container in cubic feet.→ C is the maximum number of containers to be
cooled at any one time.→ S is the maximum number of containers to be
stored at any one time
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Cold storage design (Contd..)
4. Space requirement
Storage space 3.4 m 3 /ton suitable for stacking and circulation of cold air (EIRI 2003)
Chamber height -3 to 10 m
For loading and unloading distance betweenRack & rack - should not < 75cmRack & wall - least 20-25 cmCeiling & product shelf top - 30 cm.
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Cold storage design (Contd..)
5. Design of building
Roof
Ceiling
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Cold storage design (Contd..)
FloorGround load 5500-8000 kg/m2
(FAO)
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Doors
x 90mm.
Cold storage design (Contd..)
1
2
3
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Shelf
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Cold storage design (Contd..)
6. Insulation
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Insulating materials
Polyisocyanurate Foam
Cold storage design (Contd..)
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Problems in cold store
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Vapor Barrier
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Air diffusion
Cooling coilsAir Chillers/freezers
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Defrosting
Refrigerant below -3°C , deposition of frost
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Monitoring
CFD of cool room including droplet tracks of humidification spray, temperature and humidity (taken with permission from Delele et al., 2008).
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Vapor Absorption System
Comparatively costlier but economical in
operation Cannot be used for temperature below 100C
Vapor Compression System
Comparitive chaper than VAS
Characteristics Diffusive VCS Fin coil VCS Bunker VCS
Height of storage room
Low 5.4 11.5
Economic status costliest 5% costlier than Bunker
CheapestEnergy efficient
Refrigeration system
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Refrigeration system VCS
Condenser
Evaporator
High Pressure
Side
Low Pressure
Side
CompressorExpansion Device
1 2
3
4
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Working
Source: http://www.google.ca/search?hl=en&q=refrigeration+effect&meta
AppleApple
AppleApple
Apple Apple
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Refrigeration cycle
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Refrigerants
PRIMARY Group I -nontoxic and nonflammable
CFC
Group II -slightly toxic and flammableInorganic R-717(NH3), CO2, Azeotropes
Group III - highly toxic and flammableHydrocarbons
SECONDARYBrine solutions, alklyene gycols
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Selection of refrigerant
Thermodynamic & thermophysical Suction pressure Discharge pressure Pressure ratio
Latent heat of vaporization Environmental & safety properties Economics
Clausius Clapeyron Eq.
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Refrigeration equipment
National codes of practice, insurance companies, as well as international recommendations
(ISO R1662) (BS4434 1989/).
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Flooded type evaporator
Where,f.m = recirculation factor & mass flow rate in the evaporator tubes
m = mass flow rate through the expansion valve and to the compressor. X4 = quality of mixture after the expansion valvex = be the quality of mixture after boiling in the tubes
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Heat load calculation
Field heat: heat required to reduce the product temperature at harvest down to the safe storage level.
Heat of respiration : energy released by the product during the respiration process.
Conductive heat gain : is heat gained/lost through the building floor, walls and ceiling by conduction.
Convective heat gain :is heat that is transferred by convection, the mixing of outside air with the cold inside air.
Equipment heat load : is the energy gained from equipment operating in the room.
Human energy load
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Visual basic 6.0 Heat transfer through wall ceiling & floor kJ/s
Field heat
Heat produced from lightningQ = Number of bulbs * W * (UF) * (AF) kJ/s
)( 0 iTTAUQ
t
TzTjmCQ p )(
Heat load calculation
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Heat produced due to human occupancyQ= n .Sensible heat gain
Heat given by power equipmentQ= Power range of motor in hp x 746 x 3.41 kJ/s Motor efficiency
Total refrigeration required Total heat removed
3.51 Ton of refrigeration = 3.5 kJ /s
Heat load calculation
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Working with software
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Working with software
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Software results
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References
Cold storage (1994) Kansas State University
Cold stores, FAO Chourasia, M.K and Goswami, T.K (2009).
Efficient design, operation, maintenance & management of cold storage. E-journal of Biological Sciences. Vol.1, pp 72-93.
NPTEL, lesson 23-26
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Thank You
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DESIRED Environmental conditions