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분야
pptx2. The Vapor-Compression Cycle
3. Absorption Refrigeration
4. Real Refrigeration
|Qcon| = m(Ha – Hb)
Expansion valve
Hb = Hc
Evaporator
|Qc| = m(Hd – Hc)
Absorber
mass balance
mss = strong solution (고농도)
mws = weak solution (희석된 농도)
m + mss = mws
mss = λ × m → mws = (1+λ) × m
energy balance
|Qabs| = m Hd + λ m Hj - (1+λ) m He
pump
me – mf = mws
Wpump = mws(Hf-He) = (1+λ) m (Hf-He)
and incompressible fluid (W = -∫V dp)
Wpump = (1+λ) m Vsol (Pf-Pe)
Heat exchanger
mf = mg = mws
mh = mi = mss
|Qhx|= (1+λ) m (Hg-Hf) = λ m (Hh–Hi)
Regenerator
mg=mh+ma
|QH|= m Ha + λ Hg - (1+λ) m Hg
|QH|= m [ (Ha-Hg) + λ (Hh-Hg)]
expansion valve
Hi=Hj
Cop = |Qc| / (|QH| + Wpump) ≈ |Qc| / |QH|
1. 각 단계에서 가정했었던 단열과정은
실제로는 완벽하지 못하다.
2. 등엔트로피(△S=0) 과정은 실제적으로 불가능하다.
3. 증발기에 들어가는 냉매의 온도가 기화점에 정확히
도달해서 들어 갈 수 없기때문에
증발기에서 냉각과, 상변화가 같이 일어난다.
