Paper format. Professional
Engineers of Ontario / Engineers Canada annual examination
07-Mec-B2 Environmental Control in Buildings, May 2016,
three hours, open book. Eight problems of 20 points each;
candidates are required to solve five, and all questions carry the same
value. Psychrometric charts and an R-134a p-h diagram are appended to the
paper. All eight problems are solved here, because the set is intended
as a study resource rather than an examination script.
Reference texts for this subject.
- W. P. Jones, Air Conditioning Engineering, 5th ed.,
Butterworth-Heinemann — the standard reference for this
examination code; Ch. 2–3 (psychrometry), Ch. 5–6 (heating
and cooling loads), Ch. 10 (cooling towers), Ch. 15 (fans and duct
design).
- McQuiston, Parker & Spitler, Heating, Ventilating and Air
Conditioning: Analysis and Design, 6th ed., Wiley — Ch. 3
(moist air), Ch. 6 (heating loads and infiltration), Ch. 8 (energy
estimating and the degree-day method), Ch. 12–13 (fluid flow, fans
and duct design).
- ASHRAE Handbook — Fundamentals (2021) — Ch. 1
(psychrometrics), Ch. 16 (ventilation and infiltration), Ch. 18
(residential and non-residential load calculations), Ch. 21 (duct
design), Ch. 30 (thermophysical properties of refrigerants).
- Moran, Shapiro, Boettner & Bailey, Fundamentals of Engineering
Thermodynamics, 9th ed., Wiley — Ch. 10 (vapour-compression
refrigeration, multistage systems and heat pumps).
- ANSI/ASHRAE Standard 62.1, Ventilation for Acceptable Indoor Air
Quality; ANSI/ASHRAE Standard 55, Thermal Environmental
Conditions for Human Occupancy.
- Canadian frame: National Building Code of Canada 2020
and its Appendix C design temperatures; National Energy Code of Canada
for Buildings 2020; Environment and Climate Change Canada heating
degree-day normals; CSA B52 Mechanical Refrigeration Code;
Canadian federal halocarbon regulations (SOR/2003-289) for the
refrigerant discussion in Problem 7.
Check: assumptions carried through this
paper. Cover-page instruction 1 invites a clear statement of any
assumption. Standard barometric pressure of 101.325 kPa is used throughout;
moist-air properties follow the ASHRAE Handbook — Fundamentals Ch. 1
formulation (Hyland–Wexler saturation pressure, so results agree with
the appended chart to chart-reading accuracy rather than being read off it);
R-134a properties are on the IIR datum and agree with the appended p-h
diagram. Problem-specific assumptions — climate data, fuel prices,
emission factors, air-change rates, occupant density, duct roughness and the
coil bypass factor — are stated where they are first used.
