Nomenclature</h5> T temperature (°C)</P>T 0 ambient temperature (°C)</P>Eq thermal exergy (kW)</P>Q heat load (kW)</P>T lm logarithmic mean temperature difference (°C)</P>T in inlet temperature (°C)</P>T out outlet temperature (°C)</P>el Hx heat exchanger exergy loss (kW)</P>Eq hot stream exergy delivered by hot stream or exergy source (kW)</P>Eq cold stream exergy required by cold stream or exergy sink (kW)</P>Ω energy level</P>ΔEx exergy difference (kW)</P>n molar flow</P>T * shifted temperature (°C)</P>Δ H enthalpy difference (kW)</P>η c Carnot factor</P>el TUR exergy loss in turbine (kW)</P>R universal gas constant (J/mol K)</P>P in inlet pressure (bar)</P>P out outlet pressure (bar)</P>W work (kW)</P>γ heat capacity ratio</P>Δ T min minimum temperature approach on Composite Curves (°C)</P>T PH hot pinch temperature (°C)</P>T PC cold pinch temperature (°C)</P>ΔEx source exergy delivered by source (kW)</P>ΔEx sink exergy required by sink (kW)</P>η c ∗ Carnot factor calculated based on T *</P>1 Introduction</h5> A substantial amount of heat and power should be typically entailed in petrochemical industry processes  . Ammonia production is a prevalent example of an energy consuming process, which has been improved during recent years using heat integration concepts  . Combined Pinch and Exergy Analysis has been applied for ammonia cold side, which led to reduction in compression
Applied Thermal Engineering – Elsevier
Published: Sep 1, 2013
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