ENCH291-21S1 (C) Semester One 2021

Mass and Energy Balances

15 points

Start Date: Monday, 22 February 2021
End Date: Sunday, 27 June 2021
Withdrawal Dates
Last Day to withdraw from this course:
  • Without financial penalty (full fee refund): Sunday, 7 March 2021
  • Without academic penalty (including no fee refund): Friday, 14 May 2021


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 reaction

Energy 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.

Timetable Note

Course Requirements
Lectures: Three times a week.

Attendance at all lectures is highly encouraged. Completion of all assignments, tests, and exams is required.

Course Coordinator / Lecturer

Alex Yip


Matthew Cowan

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).


Assessment Due Date Percentage  Description
Final Exam 60% Mass Balance 30% Energy Balance 30%
Mass Balance Assignment 1 22 Mar 2021 10%
Mass Balance Assignment 2 03 May 2021 10%
Energy Balance Assignment 1 17 May 2021 10%
Energy Balance Assignment 2 24 May 2021 10%

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.

Textbooks / Resources

Recommended Reading

Felder, Richard M. , Rousseau, Ronald W., Bullard, Lisa G; Elementary principles of chemical processes ; 4th edition; Wiley, 2016.

Smith, J. M. , Van Ness, H. C., Abbott, Michael M; Introduction to chemical engineering thermodynamics ; 7th ed; McGraw-Hill, 2005.


General Policies of the Department
Students 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.

Additional Course Outline Information

Where to submit and collect work

Please submit your assignments to the ENCH291 assignment box on the 4th floor of LINK.

Indicative Fees

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 .

All ENCH291 Occurrences

  • ENCH291-21S1 (C) Semester One 2021