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Mass and energy balance calculations are the essential parts of the solution of many complex chemical engineering problems. They assist in the planning and design of processes, in the economic evaluation of the proposed and existing processes, in process control, and in process optimization. In this course, students will learn a systematic procedure for solving mass and energy balance problems including drawing and labelling for a flowchart, performing a degree-of-freedom analysis, making appropriate chemical engineering assumptions etc. Students will be able to analytically examine and predict the mass and energy balances around single or multiple unit operation(s) involving gases and liquids, recycle, bypass or purge streams with or without chemical reactions.
Mass Balances- Basic Mass Balance Principles- Units conversion, mass/molar/volumetric flowrates, mass/mole fractions, total and component balances- Steady-state/unsteady-state, batch/continuous processes- Tie element, basis for calculation, flowchart labelling- Independent mass balance equations and Degree-of-Freedom analysis- Steps for solving mass balance problems- Mass balance without chemical reactions- Mass balance with chemical reaction- Mass balance with chemical reaction – combustion reactionEnergy Balances - Energy conservation and balance equations- Energy balances involving temperature change- Energy balances involving phase changes and steam- Energy balances involving reactions (isothermal and non-isothermal)
Subject to approval of the Dean of Engineering and Forestry.
Students must attend one activity from each section.
Course RequirementsLectures: Three times a week. Workload Attendance at all lectures is highly encouraged. Completion of all assignments, tests, and exams is required.
Concerns Students with concerns about the course should contact any of the lecturers listed above. General enquiries about 2nd Year (200-level) study should contact the 2nd Year Director of Studies (Assoc. Prof. Ken Morison).
COURSE POLICY ON COLLABORATION AND CHEATING Solving problems in small teams and collaborative learning when working on assignments is encouraged. However direct copying is plagiarism and will result in zero marks for all students involved. When assessment is distributed, you will be instructed whether the assessment is to be submitted for marking individually or as part of a pair/group. The assignments are mainly a tool to prepare you for the exams. The advice is to try them individually before collaborating in groups.
Felder, Richard M. , Rousseau, Ronald W., Bullard, Lisa G;
Elementary principles of chemical processes
Smith, J. M. , Van Ness, H. C., Abbott, Michael M;
Introduction to chemical engineering thermodynamics
General Policies of the DepartmentStudents may obtain the general policies of the University on matters such as the special considerations applications, appeals procedures, reconsideration of grades and special provision for students with disabilities from the University Calendar. The Departmental assessment details are distributed to the students at the beginning of the year.
This is a compulsory course which provides a basis for many other courses in chemical engineering.
Please submit your assignments to the ENCH291 assignment box on the 4th floor of LINK.
Domestic fee $986.00
International fee $5,500.00
* All fees are inclusive of NZ GST or any equivalent overseas tax, and do not include any programme level discount or additional course-related expenses.
For further information see
Chemical and Process Engineering