Paper format. National Examinations, May 2019 — 16-Mec-B2 Environmental
Control in Buildings. Three hours, open book: any textbooks, references or notes may be used and
any non-communicating calculator is permitted, but computers, internet and smart phones are
prohibited. Candidates are told to bring both an environmental-control text and steam tables.
Eight problems are printed — Problem 1 is 30 points, Problem 2 is 10 points and
Problems 3 to 8 are 20 points each — and candidates solve five, indicating on the
cover of the first workbook which five are to be graded. Psychrometric charts and the refrigerant
pressure–enthalpy diagram are attached as the last three pages. Cover-page instruction 1 asks
for a clear statement of the assumption(s) wherever the interpretation is open, and several
problems below need one. All eight problems are worked here, because this set is a
study resource rather than a three-hour sitting.
Reference texts for this subject.
- ASHRAE Handbook — Fundamentals, Ch. 1 (Psychrometrics), Ch. 14 (Climatic Design
Information), Ch. 15 (Fenestration), Ch. 16 (Ventilation and Infiltration), Ch. 19 (Energy Estimating
and Modeling Methods), Ch. 21 (Duct Design).
- McQuiston, Parker & Spitler, Heating, Ventilating and Air Conditioning: Analysis and
Design, 6th ed. — plant psychrometry, infiltration, duct design, solar heat gain and the
degree-day method.
- Jones, Air Conditioning Engineering, 5th ed. — apparatus dew point, coil by-pass
factor, humidification.
- Stoecker & Jones, Refrigeration and Air Conditioning, 2nd ed. — vapour-
compression cycle analysis and compressor volumetric efficiency.
- Çengel & Boles, Thermodynamics: An Engineering Approach, 9th ed. —
R-134a property tables and steam tables.
- Environment and Climate Change Canada, Canadian Climate Normals — Ottawa
heating degree-days; National Energy Code of Canada for Buildings (NECB) 2020 for the net-zero
discussion.
Check: every psychrometric state below is computed from the ASHRAE Ch. 1
formulations rather than read off the attached chart, and every mixing state is obtained from the
exact mass and energy balances (humidity ratio and enthalpy mass-weighted, dry bulb then
derived). Chart readings will differ in the last displayed digit; the physics does not.
