BPI HVAC Systems 5

Question 1

In the context of BPI whole-house assessments, what does the term 'infiltration' describe?

Accepted Answer

Uncontrolled air leakage into a building through the envelope

Answer

Infiltration refers to uncontrolled, unintentional outdoor air entering a building through gaps, cracks, and penetrations in the building envelope.

Question 2

A homeowner has a condensing (high-efficiency) gas furnace that drains condensate. The condensate line freezes in winter, causing the furnace to shut down. What is the BEST long-term solution?

Accepted Answer

Re-route or insulate the condensate line to prevent freezing

Answer

Re-routing the condensate drain to a warm interior location or insulating exposed sections prevents freezing without sacrificing equipment efficiency.

Question 3

What does an Energy Recovery Ventilator (ERV) do differently than a Heat Recovery Ventilator (HRV)?

Accepted Answer

ERV transfers both sensible heat and moisture; HRV transfers only sensible heat

Answer

An ERV exchanges both sensible heat and moisture (latent energy) between incoming and outgoing airstreams, while an HRV exchanges sensible heat only.

Question 4

What is the recommended practice when a BPI energy auditor finds existing knob-and-tube (K&T) wiring in an attic that is to receive blown-in insulation?

Accepted Answer

Consult an electrician before insulating, as K&T must not be covered

Answer

Knob-and-tube wiring relies on free-air cooling and must not be covered with insulation; an electrician must evaluate or replace it before any insulation is added.

Question 5

Which of the following best describes the 'stack effect' in a tall building during cold weather?

Accepted Answer

Warm indoor air rises and exits near the top while cold air enters at the bottom

Answer

During cold weather, buoyant warm interior air rises and exits through upper openings while cold outdoor air infiltrates through lower openings, creating a chimney-like effect.

(BPI) Building Performance Institute Certified Practice Test

(BPI) Building Performance Institute Certified Practice Test

BPI HVAC Systems 5