열역학 Refrigerator

열역학 Refrigerator [열역학] Refrigerator.pptx 목차 1. Carnot refrigerator 2. The Vapor-Compression Cycle 3. Absorption Refrigeration 4. Real Refrigeration 본문 Condenser |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 mHj - (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. 본문내용 sorption Refrigeration 4. Real Refrigeration PAGE:3 1. Carnot refrigerator PAGE:4 2. The Vapor-Compression Cycle Work QH Qc Work Cold reservoir Hot reservoir Refrigerator PAGE:5 2. The Vapor-Compression Cycle PAGE:6 Rate of circulation of refrigerant |QC|=H=H2-H1, |QH|=H3-H4 2. The Vapor-Compression Cycle Steady state flow KE , PE negligible (=0) PAGE:7 2. The Vapor-Compression Cycle Ste