Mass and Energy Balances

Course Information
TitleΙσοζύγια Μάζας και Ενέργειας / Mass and Energy Balances
SchoolChemical Engineering
Cycle / Level1st / Undergraduate
Teaching PeriodSpring
Course ID20000816

Programme of Study: PPS Tmīmatos CΗīmikṓn Mīchanikṓn (2021-sīmera)

Registered students: 0
OrientationAttendance TypeSemesterYearECTS
KORMOSCompulsory Course215

Class Information
Academic Year2019 – 2020
Class PeriodSpring
Faculty Instructors
Weekly Hours3
Class ID
Course Type 2016-2020
  • Background
Course Type 2011-2015
General Foundation
Mode of Delivery
  • Face to face
Digital Course Content
The course is also offered to exchange programme students.
Language of Instruction
  • Greek (Instruction, Examination)
  • English (Instruction, Examination)
Learning Outcomes
Students should be in position to carry-out the material and energy balance s in any physical or chemical process. Specifically, students will be able to: 1. transform units of various variables 2. calculate degree of freedom in solving a problem 3. set up and solve a mass balance problem, with or without combustion, recycle, reaction 4. set up and solve energey balance problems alone or in combination with mass balance equations 5. read and understand phase diagrams, phase changes, gas properties, psychrometric charts 6. apply mass and energy conservation principles in industrial cases (food, chemical, pharma etc.)
General Competences
  • Apply knowledge in practice
  • Work autonomously
  • Be critical and self-critical
  • Advance free, creative and causative thinking
Course Content (Syllabus)
MASS AND ENERGY BALANCES Material balances and definitions. Simple flow sheets. Combustion and excess air. Elements of phase equilibria. Equations of state. Critical and reduced T and P. Compressibility factor (Z). Pure gases and gas mixtures. Partial pressure. Humid-ity; steam tables; drying and humidification processes. Energy balances. Defini-tions (work, heat, energy, enthalpy, specific heat). Enthalpy calculations. Phase change and ΔH calculations. Generalized energy balance. Enthalpy of reaction. Reactions at T, P other than standard. Enthalpy of dilution and of mixing. Com-bined mass and energy balances. Distillation. Degrees of freedom. Enthalpy – concentration diagrams. Humidification – dehumidification – cooling diagrams. Applications. Non-steady state mass and energy balances. Simple non-steady state mass balances, mixing, distillation, reaction. Simple non-steady state energy bal¬ances, heat transfer. Simple applications and examples. Students are required to attend a computer lab on the use of Aspen Plus. Students are required to submit 2-3 project reports. They count 20% in final grade. Esti-mated time per project, about 10 hours. A mid-term exam is optional, and counts 30% in final grade
Mass and Energy balances, Thermophysical properties
Educational Material Types
  • Slide presentations
  • Book
Use of Information and Communication Technologies
Use of ICT
  • Use of ICT in Course Teaching
  • Use of ICT in Communication with Students
Computer slides and presentations, use of the electronic platform "elearning" for communication with the students, weekly online quiz
Course Organization
Reading Assigment0
Written assigments24
online excercise/quiz30
Student Assessment
Written exams (80%) Online quiz on weekly base (20%) Voluntary excercises (20% on top of the final grade)
Student Assessment methods
  • Written Exam with Short Answer Questions (Formative)
  • Written Exam with Extended Answer Questions (Formative)
  • Written Assignment (Summative)
Course Bibliography (Eudoxus)
D.M.Himmelblau (Μετάφραση Γ.Π.Σακελλαρόπουλος, Βασικές Αρχές και Υπολογισμοί στη Χημική Μηχανική D.M.Himmelblau , J.B.Riggs , “Βασικές Αρχές και Υπολογισμοί στη Χημική Μηχανική”, 7η Εκδοση (Μετάφραση Γ.Μαρνέλος), Εκδ. Τζιόλα (2006)
Additional bibliography for study
Reklaitis G.V., “Introduction to Material & Energy Balances”, J.Wiley (1983). Felder R.M. and Rausseau R.W., “Elementary Chemical Processes”, J.Wiley (1978)
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