ENCH291-20S1 (C) Semester One 2020

Mass and Energy Balances

15 points

Start Date: Monday, 17 February 2020
End Date: Sunday, 21 June 2020
Withdrawal Dates
Last Day to withdraw from this course:
  • Without financial penalty (full fee refund): Friday, 28 February 2020
  • Without academic penalty (including no fee refund): Friday, 29 May 2020


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 2020

Students must attend one activity from each section.

Lecture A
Activity Day Time Location Weeks
01 Tuesday 09:00 - 10:00 F3 Lecture Theatre (18/2-17/3)
- (24/3, 21/4)
Live Stream Available (28/4-26/5)
17 Feb - 29 Mar
20 Apr - 31 May
Lecture B
Activity Day Time Location Weeks
01 Wednesday 10:00 - 11:00 Ernest Rutherford 140 (19/2-18/3)
- (25/3, 22/4)
Live Stream Available (29/4-27/5)
17 Feb - 29 Mar
20 Apr - 31 May
Lecture C
Activity Day Time Location Weeks
01 Thursday 09:00 - 10:00 A5 Lecture Theatre (20/2-19/3)
Live Stream Available (23/4-28/5)
17 Feb - 22 Mar
20 Apr - 31 May

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

Alex Yip

Students with concerns about the course should contact any of the lecturers listed above. General enquiries about the First Professional Year (200-level) study should contact the 1st Pro Director of Studies (Assoc. Prof. Ken Morison).


Assessment Due Date Percentage  Description
Energy Balance Assignment 1 10%
Energy Balance Assignment 2 10%
Mass Balance Assignment 1 10%
Mass Balance Assignment 2 10%
Final Exam 60% Mass Balance 30% Energy Balance 30%

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.


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.

Indicative Fees

Domestic fee $975.00

International fee $5,500.00

* Fees include New Zealand GST and do not include any programme level discount or additional course related expenses.

For further information see Chemical and Process Engineering.

All ENCH291 Occurrences

  • ENCH291-20S1 (C) Semester One 2020