- Ascertain which ventilation system the NZ Green building rating tool encourages most in office spaces.
- Compare occupants’ perception of thermal comfort in different ventilated office buildings (natural ventilation, mixed-mode and air conditioned).
3.1. NZ Greenstar IEQ Criteria and Natural Ventilation (Objective 1)
The Applicability of PMV versus Adaptive Model in Green Rating Tools
3.2. Occupants’ Perception of Thermal Comfort in Their Office Buildings (Objective 2)
- Temperature extremity (too hot, too cold)
- Temperature fluctuation (stable or varied)
- Air flow rate
- Control over temperature
3.2.1. Sick Leave Taken per Year
3.2.2. Thermal Comfort Satisfaction
3.3. Descriptive Analysis
3.3.1. Satisfaction Rating for Thermal Comfort
3.3.2. Impact of Thermal Comfort Factors on Worker Performance
Conflicts of Interest
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|Ref. No.||Title||Aim of Credit||Credit Criteria Summary||Points Awarded|
|IEQ-6||Thermal Comfort||To encourage and recognise the use of thermal comfort assessments to guide design options.||Up to three points are awarded where it is demonstrated that assessments have been made of thermal comfort levels and used to evaluate appropriate servicing options.|
The following Predicted Mean Vote (PMV) levels, calculated in accordance with ISO 7730, (or equivalent using Draft ASHRAE Comfort Standard 55 and “Developing an Adaptive Model of Thermal Comfort and Preference—Final Report on ASHRAE RP884”), must be achieved during Standard Hours of Occupancy and using standard clothing, metabolic rate and air velocity values for 90% of the year.
|For mechanically ventilated and mixed-mode buildings:|
One point = PMV levels are between −1 and +1
Two Points = PMV levels are between −0.75 and +0.75 and
Three points = PMV levels are between −0.5 and +0.5.
For naturally ventilated buildings:
Two Points = PMV levels are between −1 and +1 and
Three points = PMV levels are between −0.75 and +0.75.
|Gender||Female = 25%||Male = 75%|
|Age||Under 25 = 10%||25–35 = 22%||36–45 = 18%||Above 45 = 50%|
|Ventilated space||NV = 38%||AC = 29%||MM = 33%|
|N||Mean (MR)||Std. Deviation||Std. Error||95% Confidence Interval for Mean||Rank|
|Lower Bound||Upper Bound|
|Reliability Test (Cronbach Alpha = 0.808)||Cronbach Alpha If Item Deleted|
|Temperature Fluctuation Rate||742|
|Air Flow Change Rate||801|
|N||Mean (MR)||Std. Deviation||Std. Error||95% Confidence Interval for Mean||Rank|
|Lower Bound||Upper Bound|
|Temperature Extreme||Natural Ventilation||82||2.2683||0.70358||0.07770||2.1137||2.4229||1st|
|Temperature Fluctuation Rate||Natural Ventilation||82||2.0610||0.65447||0.07227||1.9172||2.2048||4th|
|Air Flow Change Rate||Natural Ventilation||82||2.1829||0.78768||0.08699||2.0099||2.3560||3rd|
|Temperature Control||Natural Ventilation||82||2.2073||0.74928||0.08274||2.0427||2.3720||2nd|
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