Paper format. National Examinations, December 2018 —
16-Mec-B2 Environmental Control in Buildings. Three hours, open book
(an environmental-control text and steam tables are expected; any non-communicating calculator is
permitted). Eight problems are printed and candidates solve five: Problem 1 carries
30 points, Problem 2 carries 10 points and Problems 3–8 carry 20 points each, so the printed
paper totals 160 points and a graded script totals 100. Psychrometric charts (SI and IP) and an
R-134a pressure–enthalpy diagram are attached to the paper. All eight problems are worked
below.
Reference texts for this subject.
- ASHRAE Handbook — Fundamentals, Ch. 1 (Psychrometrics), Ch. 14 (Climatic Design
Information), Ch. 18 (Nonresidential Cooling and Heating Load Calculations), Ch. 19 (Energy
Estimating and Modeling Methods), Ch. 21 (Duct Design).
- McQuiston, Parker & Spitler, Heating, Ventilating and Air Conditioning: Analysis and
Design, 6th ed. — the CLTD/SCL/CLF cooling-load method, duct design and the
degree-day/bin energy methods.
- Jones, Air Conditioning Engineering, 5th ed. — plant psychrometry, percentage
saturation, apparatus dew point and coil by-pass factor.
- Incropera & DeWitt, Fundamentals of Heat and Mass Transfer, 8th ed., Ch. 3 —
one-dimensional composite-wall conduction; Table A.3 for building-material conductivities.
- Stoecker & Jones, Refrigeration and Air Conditioning, 2nd ed. — vapour
compression cycles, compressor displacement and volumetric efficiency.
- ASHRAE Refrigerant Tables for R-134a (datum hf = sf
= 0 at −40 °F, the datum of the attached chart).
- Canadian context: National Energy Code of Canada for Buildings (NECB 2020), Canada Green
Building Council (CAGBC) LEED v4 and Zero Carbon Building Standard, and Environment and Climate
Change Canada Canadian Climate Normals for degree-day data.
