24-Bld-A4 Building Environmental Control Systems · May 2017

Question 6 of 14: FCU Selection for the Condominium Unit

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

Notes on this paper

National Exams May 2017 — 07-Bld-A4, Building Environmental Control Systems (Building Engineering). 3-hour closed-book exam: Section 1 (four 20-mark essay/calculation questions) + Section 2 (ten 2-mark multiple-choice questions).

Reference texts: ASHRAE Handbook — Fundamentals (2021 ed.); ASHRAE Standard 62.1, Ventilation for Acceptable Indoor Air Quality (2022 ed.); McQuiston, Parker & Spitler, Heating, Ventilating, and Air Conditioning: Analysis and Design (6th ed.); National Building Code of Canada 2020 (NBCC); National Energy Code of Canada for Buildings 2020 (NECB).

Question 2.2: FCU Selection for the Condominium Unit (2 marks)

Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.

Given/Find. Required flow from Question 2.1 = 568.4 m³/hr; convert to CFM and select the smallest listed unit whose nominal airflow meets or exceeds it.

1. Convert to CFM. $$568.4\times0.5886 = 334.6\ \text{CFM}$$
2. Select the smallest sufficient unit. Unit Size 03 (300 CFM) is insufficient; Unit Size 04 (400 CFM) is the next size up and covers the requirement. $$\boxed{\text{Unit Size 04 (400 CFM)}}$$

Final Result

Answer: (e) Unit Size 04

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