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Openai/691371b1-7230-8010-b628-87d4fc82f6d3
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=== Assistant: Ta coi nén đoạn nhiệt isentropic, bỏ qua động năng/ thế năng ⇒ === Ta coi nén đoạn nhiệt (isentropic), bỏ qua động năng/ thế năng ⇒ ws=h2−h1,s2=s1, p2=1000 kPa.w_s = h_2-h_1,\qquad s_2=s_1,\ p_2=1000\ \text{kPa}.ws=h2−h1,s2=s1, p2=1000 kPa. Tra bảng R22: * Trạng thái hút: “bão hoà khô” tại −48∘C-48^\circ C−48∘C: h1≃384.35 kJ/kg, s1≃1.8427 kJ/(kg\cdotpK)h_1\simeq 384.35\ \text{kJ/kg},\ s_1\simeq 1.8427\ \text{kJ/(kg·K)}h1≃384.35 kJ/kg, s1≃1.8427 kJ/(kg\cdotpK). Engineering ToolBox<ref>{{cite web|title=Engineering ToolBox|url=https://www.engineeringtoolbox.com/r22-properties-d_365.html|publisher=Engineering ToolBox|access-date=2025-11-11}}</ref> * Ở p2=1000 kPap_2=1000\ \text{kPa}p2=1000 kPa, cột hơi quá nhiệt (Chemours): hàng khoảng 60 °C cho s≈1.84 kJ/(kg\cdotpK)s\approx1.84\ \text{kJ/(kg·K)}s≈1.84 kJ/(kg\cdotpK) ⇒ h2≈463 kJ/kgh_2 \approx 463\ \text{kJ/kg}h2≈463 kJ/kg. Freon<ref>{{cite web|title=Freon|url=https://www.freon.com/en/-/media/files/freon/freon-22-thermodynamic-properties-si.pdf?rev=1c823506cef542b798652d30e2c4973a|publisher=freon.com|access-date=2025-11-11}}</ref> ⇒ Công riêng nén đoạn nhiệt: ws≈463−384.35=78.7 kJ/kg.w_s \approx 463-384.35 = 78.7\ \text{kJ/kg}.ws≈463−384.35=78.7 kJ/kg. Với m=10.5 kgm=10.5\ \text{kg}m=10.5 kg: W=m ws≈10.5×78.7≈8.3×102 kJW = m\,w_s \approx 10.5\times 78.7 \approx \boxed{8.3\times 10^2\ \text{kJ}}W=mws≈10.5×78.7≈8.3×102 kJ (khoảng 0.83 MJ0.83\ \text{MJ}0.83 MJ).
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