Intent:
- Provide additional outdoor air ventilation to improve IAQ for improved occupant comfort, well-being of occupants and productivity.
Implementation:
- Mechanically Vented Spaces:
- increase breathing zone outdoor air ventilation rates to 30% above minimum ASHRAE 62.1-2004 rates
- Naturally Vented Spaces:
- design system to meet Carbon Trust Good Practice Guide 237 (1998).
- make sure ventilation is effective by flow diagram in Figure 1.18 of CIBSE Application Manual 10: 2005
- use diagrammatic calculations to show design meets CIBSE or..
- use macroscopic, multi-zone, analytic mode to predict room-by-room airflows naturally ventilate 90% of occupied spaces per ASHRAE 62.1-2004
Codes:
- ASHRAE 62.1-2004: Ventilation for Acceptable IAQ
- Carbon Trust Good Practice Guide 237 (1998): Natural ventilation in non-domestic buildings
- CIBSE Application Manual 10 (2005): Natural ventilation in non-domestic buildings
Submittal Phase:
- design
Indoor Environmental Air Quality
- EQ P1 – Minimum IAQ Performance (prerequisite)
- EQ P2 – Environmental Tobacco Smoke (ETS) Control (prerequisite)
- EQ 1 – Outdoor Air Delivery Monitoring
- EQ 2 – Increased Ventilation
- EQ 3.1 – Construction IAQ Management Plan, During Construction
- EQ 3.2 – Construction IAQ Management Plan, Before Occupancy
- EQ 4.1 – Low-Emitting Materials, Adhesives & Sealants
- EQ 4.2 – Low-Emitting Materials, Paint & Coatings
- EQ 4.3 – Low-Emitting Materials, Carpet Systems
- EQ 4.4 – Low-Emitting Materials, Composite Wood & Agrifiber Products
- EQ 5 – Indoor Chemical & Pollutant Source Control
- EQ 6.1 – Controllability of Systems, Lighting
- EQ 6.2 – Controllability of Systems, Thermal Comfort
- EQ 7.1 – Thermal Comfort, Design
- EQ 7.2 – Thermal Comfort, Verification
- EQ 8.1 -Daylight & Views, Daylight 75% of Spaces
- EQ 8.2 – Daylight & Views, Views for 90% of Spaces
20 Comments On This Post
it’s the carbon trust good practice guide 237…not 2347…
and the CIBSE – not cubes
clarification:
eq-p1- ventilation rate- ashrae 62-2001
eq-cr2- air exchange effecttiveness – ashrae 129-1999 -has this changed to 62-2001?
I guess its CIBSE Application manual not CUBES application manual…
Does anyone know how to get a hold of “Carbon Trust Good Practices Guide 237”? I have been looking on the internet including the UK Carbon Trust website and could not find it anywhere. If someone has a pdf version that they could email, I would appreciate it.
Regards,
Kevin Luoma
kluoma@towerhawaii.com
Im stumped on the following question from a LEED practice exam. If anyone can provide any insight on why answer A qualifies, I would be very grateful.
A telemarketing firm with 300 employees plans to use a raised floor to reduce the cost of cable management and churn in a proposed open floor plan office with shallow floor plate. The design includes underfloor air distribution for cooling and ventilation. The engineer noted that this system would allow the use of a floor mounted operable diffuser for each workstation. A closer look revealed that the moderate supply air temp req’d at these diffusers would reduce the amount of energy associated with cooling a consistently greater quality of outside air. The architect pointed out that the underfloor air distribution system would also eliminate large overhead ducts, which could, in this particular case, increase the interior floor to ceiling heights.
Given the info provided above, what LEED credits might these strategies contribute to? (Choose 3)
A EQ 2 Increased Ventilation
B EQ3 Const. IAQ Plan
C EQ 8.2 Daylighting and Views: views for 90% of space
D EQ6.2 Controlability of Systems- Therman Comfort
E EA5 Measurement and Verification
F EQ8.1 Daylighting and Views: Day 75% of spaces
Answers: ADF
How does any of these contribute to A: EQ 2 Increased Ventilation ?
I agree, I am taking the exam tomorrow morning and though I would have chosen A as an answer, I cannot find any direct evidence of increased vantilation due to raise floor design.
Increased ventilation is relevant because the underfloor air uses higher temperature air, which “would reduce the amount of energy associated with cooling a consistently greater quality of outside air.” (quote from the test question.
I would also have noted that Construction IAQ is massively implicated, because it’s harder to keep debris out of the underfloor system during construction.
Thanks for posting that insight, Kevin.
In the question by Steve above, how does answer F contribute? Daylight75% of Space, does that have to do w/ the shallow floor plate?
What is a shallow floor plate?
I believe a plate has to do w/ the bldg floor; if the plate is shallow (think of a bldg layout that is 200 ft long but only 20 ft wide) then since its not very wide (shallow), there is an increased chance for lighting to enter the bldg and penetrate the center of the bldg.
This is how I understand it. Does anyone disagree or have more input?
So it’s like the buidling shown on the photo on the Referenece Guide bookcover? I got it. Thanks.
I think for the reasoning of the daylighting is from the input from the architect about “…underfloor air distribution system would also eliminate large overhead ducts, which could, in this particular case, increase the interior floor to ceiling heights.”
This means that you can have more space available from interior floor to ceiling height for your windows to reach the 7′-6″ needed to provide more daylighting.
I would say the reason for daylighting is open floor plan office with shallow floor plate.
Its not D because the viewable glazing between 2’6 and 7’6 would not be affected by raising the ceiling height (no ceiling is under 7′-6″).
for those who haven’t taken the exam yet [i will write it on the 28th] and this answer could still contribute to solve the doubts.
by the question’s given context one could agree that the strategies involve an interior renovation not exterior to save money on cable management, so daylight and views don’t play a big role, even though they could as the architect states in the question [in order to accomplish EQ 8.1/8.2 the building envelope could be modified, thus representing more expenditure]
i first identified the strongest strategy, which to me was “The engineer noted that this system would allow the use of a floor mounted operable diffuser for each workstation”. this strategy is clearly stated under controllability of systems-thermal comfort EQ 6.2 [page 361]. so D qualifies as an strategy.
i believe most of the credits that state the use of controls required commissioning, calibration and/or measurement and verification. commissioning is not involved because the control is not an automatic [electronic] device but it affects the energy performance expressed in savings of the building, thus involving M&V. F is a correct answer. so the diffuser strategy along affected 2 credits.
even though construction IAQ management plan can get involved i don’t think an underfloor air distribution strategy is proposed to gain that credit point, thus making answer A the most suitable.
i hope this helps and am not confusing anyone but it also helped me to understand the type of information given in a question, what is relevant.
Hi Pat,
Could you please explain Increased Ventilation: For Naturally Ventilated Spaces, last option more clearly, since I am a bit confused.
It states that: Use a macroscopic, multi-zone, analytic model to predict that………minimum ventilation rates required by ASHRAE 62.1-2004 Chapter 6, for at least 90% of occupied spaces.
Now here is the confusion…….EQp1- If you read the Reference Guide version 2.2 (Oct 2005) page290, Mechanically Ventilated Spaces- Ventilation Rate Procedures carefully,you will notice that ASHRAE 62.1-2004, Section 6 talks about Mechanically Ventilated Spaces & in EQC1- the same thing ASHRAE 62.1-2004 Chapter 6, talks about Naturally Ventilated Spaces.
THE QUESTION is whether SECTION 6 & CHAPTER 6 are same or two different things?? Could someone please help & explain!!
Thanks
Parinita
P1 and C2 both talk about venting using mech and natural methods…..P1 also has mixed…. C2 doesn’t seem to really address mixed… or I am missing something? Also, the natural venting analytic model only meets ASHRAE standards like the prerequisite vereses exceeding them. What am I missing here? Carbon Trust and CIBSE are completely different references so can’t realy be compared… Geez there is a lot to absorb…
Hello,
Quick question, should the 30% increase in ventilation be compared to ASHRAE 62.1.2004 rates or to the rate used in EQ.P.1 which might be more than ASHRAE in case the local standards are more strigent.
thanks
Anyone know where to get the Natural Ventilation in Non-domestic Buildings manual in pdf format?
Travis
travis19782004@yahoo.com