โ๏ธ Absorption Refrigeration Cycle Calculator
Model NHโ-HโO (aqua-ammonia) and LiBr-HโO absorption refrigeration systems. Compute COP, heat duties (generator, absorber, condenser, evaporator), circulation ratio f, and compare against Carnot absorption COP.
๐ Configuration
Key Equations:
COP = Qevap/(Qgen+Wpump)
COPCarnot = (Te/(TcโTe))ยท(TgโTa)/Tg
f = xs/(xsโxw)
Energy: Qgen+Qevap+Wp = Qcond+Qabs
COP = Qevap/(Qgen+Wpump)
COPCarnot = (Te/(TcโTe))ยท(TgโTa)/Tg
f = xs/(xsโxw)
Energy: Qgen+Qevap+Wp = Qcond+Qabs
๐ Results
Configure inputs and click Analyze to view results.
๐ Methodology
NHโ-HโO System
Ammonia is the refrigerant, water is the absorbent. Can reach sub-zero evaporator temperatures (โ25ยฐC and below). Requires a rectifier to purify ammonia vapor from the generator.
LiBr-HโO System
Water is the refrigerant, LiBr solution is the absorbent. Limited to evaporator temps above 0ยฐC (typically 5โ10ยฐC for air conditioning). Higher COP than NHโ 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 NHโ system.