Foil-Faced Bubble Wrap Duct “Insulation”

Oct 26, 2021 | Dr. Energy | 0 comments

As we continue to see ‘foil bubble insulation’ used incorrectly as duct insulation, it is time to separate the facts from the fiction.  This is a critical issue as the improper installation of these products often increases the heat loss or gain by a factor of four,...

ACCA Residential HVAC Standards: Manual J – Load Calculations, Manual D – Duct Design, and Manual S – Equipment Selection: Part 5

Jun 24, 2021 | Dr. Energy | 0 comments

Part 5: Infiltration and Ventilation Air – Impact on Load Calculation This discussion is the fifth in a series on the design a residential HVAC system in accordance with ACCA Manuals J, D, and S, as requirement by the ICC mechanical and energy codes.  The focus...

ACCA Residential HVAC Standards: Manual J – Load Calculations, Manual D – Duct Design, and Manual S – Equipment Selection: Part 4

Jun 24, 2021 | Dr. Energy | 0 comments

Part 4: Fenestration Windows, Doors, and Skylights – Impact on Heat Loss and Heat Gain The IECC (International Energy Conservation Code) include this definition: FENESTRATION. Products classified as either vertical fenestration or skylights. Skylight. Glass or other...

ACCA Residential HVAC Standards: Manual J – Load Calculations, Manual D – Duct Design, and Manual S – Equipment Selection: Part 3

Jun 24, 2021 | Dr. Energy | 0 comments

Part 3: Thermal Factors R-values, U-factors & SHGCs – Consistency on all Construction Documents This discussion is the third in a series on the code requirements for the designing residential HVAC system in accordance with ACCA Manuals J, D, and S.  The focus here...

ACCA Residential HVAC Standards: Manual J – Load Calculations, Manual D – Duct Design, and Manual S – Equipment Selection: Part 2

Jun 24, 2021 | Dr. Energy | 0 comments

Part 2: Manual J Design Conditions In Part one, we introduced a series of discussions on load calculation, duct design, and equipment selection.  In this 2nd Part, we will discuss design conditions, opening with a review of several words and terms, as identified in...

ACCA Residential HVAC Standards: Manual J – Load Calculations, Manual D – Duct Design, and Manual S – Equipment Selection: Part 1

Jun 23, 2021 | Dr. Energy | 0 comments

Part 1: Introduction This is first of several discussions in a series on factors impacting residential HVAC design. Manuals J, D and S, the ACCA/ANSI Standards for Residential HVAC Design, are recognized by virtually all current Energy, Mechanical and Building Codes,...