❄️ Absorption Refrigeration Cycle Calculator
Model NH₃-H₂O (aqua-ammonia) and LiBr-H₂O absorption refrigeration systems. Compute COP, heat duties (generator, absorber, condenser, evaporator), circulation ratio f, and compare against Carnot absorption COP.
📝 Configuration
Key Equations:
COP = Qevap/(Qgen+Wpump)
COPCarnot = (Te/(Tc−Te))·(Tg−Ta)/Tg
f = xs/(xs−xw)
Energy: Qgen+Qevap+Wp = Qcond+Qabs
COP = Qevap/(Qgen+Wpump)
COPCarnot = (Te/(Tc−Te))·(Tg−Ta)/Tg
f = xs/(xs−xw)
Energy: Qgen+Qevap+Wp = Qcond+Qabs
📊 Results
Configure inputs and click Analyze to view results.
📘 Methodology
NH₃-H₂O System
Ammonia is the refrigerant, water is the absorbent. Can reach sub-zero evaporator temperatures (−25°C and below). Requires a rectifier to purify ammonia vapor from the generator.
LiBr-H₂O System
Water is the refrigerant, LiBr solution is the absorbent. Limited to evaporator temps above 0°C (typically 5–10°C for air conditioning). Higher COP than NH₃ systems at moderate conditions.
Assumptions
- Simplified property correlations (educational).
- No solution heat exchanger (SHX) modeled.
- Steady-state operation.
- Pump work is small relative to Q_gen.
- No rectifier losses for NH₃ system.