Solardriven ejector refrigeration system

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Solar-driven ejector refrigeration system
Wimolsiri Pridasawas Royal Institute of
Technology Stockholm, Sweden
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Contents

• Introduction
• Solar cooling path and local conditions
• Solar-driven ejector refrigeration system
• How can it work?
• Advantages-Disadvantages
• Performance
• Refrigerants

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• Disadvantages
• Low COP
• Triggy in desiging an ejector

• Advantages
• Low temperature heat source can be used.
• Low operating and installation cost.

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Performance

• COP
• Entrainment ratio

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System Performance

• STR (System Thermal Ratio)?
• SEE (System electrical efficiency)?
• System efficiency??

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Working fluids

• Solar collector sub-cycle
• Refrigeration sub-cycle

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Refrigerants

• Physical and thermodynamics characteristics
• Environmental impact
• Safety
• Economic and availability

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Possible Refrigerants
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Refrigerant classifications

• Halocarbon e.g. R11, R113, R114, R134a, R245ca,
  R245fa and R152a
• Hydrocarbon e.g. methane (R50), ethane (R170),
  propane (R290), cyclopropane (RC270), butane
  (R600), isobutane (R600a) and ethylene glycol
• Compound refrigerants e.g. R407A, R407B, and
  R410A
• Other refrigerants e.g. water (R718) and ammonia
  (R717)

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Performance at refrigeration load 5 kW and
condensing temperature 30 C
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Effect of generating temperature to COP
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Volume of refrigerant vapour per cooling power at
different evaporating temperature in a logarithm
scale.