Tiện nghi nhiệt đánh giá mức độ hài lòng của cơ thể con người đối với môi trường nhiệt xung quanh. Vấn đề đặt ra là làm thế nào để đảm bảo điều kiện tiện nghi nhiệt và nên sử dụng phương pháp nào để đánh giá điều kiện tiện nghi nhiệt trong công trình (cho cả công trình có hệ thống điều hòa không khí và công trình tận dụng thông gió tự nhiên). Buổi chia sẻ sẽ đi sâu vào vấn đề nêu trên và đồng thời nêu lên sự khác nhau giữa các phương pháp đánh giá tiện nghi nhiệt của Mỹ, Châu Âu và so sánh với điều kiện khí hậu tại Việt Nam.

1. Thermal Comfort in Green Buildings
Contact:
MEng Le Luong Vang
LEED AP, LOTUS AP, GBS EXPERT,
Le.vang@rhdhv.com – 090 838 5689
Website: www.royalhaskoningdhv.com

2. 29 August 2020
Integrated Sustainable Design
Heineken Da Nang Hanuman Cambodia ECCO Bau Bang
Heineken Vung Tau UPPC Paper Philippines Pepsico Binh Duong
Heineken Tien Giang Huu Nghi Cake Factory Bibica Cake Factory
CONTACT US:
MEng LE LUONG VANG
LEED AP, LOTUS AP, GBS EXPERT,
Le.vang@rhdhv.com – 090 838 5689
2
FM Logistic Warehouse Bac Ninh

3. 29 August 2020
Integrated Sustainable Design
Site assessment Solar, Wind, Orientation Building Envelope MEP Optimization Occupant Comfort Energy Consumption
CONCEPT BASIC DETAILSCHEMATIC
Solar Radiation Exterior Wind
3
70,000 sqm GFA

4. 29 August 20204
1. What is Thermal Comfort
2. How to Design/Assess Thermal Comfort in Buildings
3. Thermal Comfort in Tropical Climate (Vietnam)
4. Project References
Energy-efficient buildings are only effective when
the occupants in the buildings are comfortable
Thermal Comfort in Green Buildings

5. 29 August 20205
Definition ISO 7730: Thermal comfort is the
condition of mind that expresses satisfaction
with thermal environment.
6x factors have a major influence on the
sensation of thermal comfort:
▪ Air temperature [°C]
▪ Relative humidity [%]
▪ Air velocity [m/s]
▪ Mean radiant temperature [°C],
▪ Metabolic rate [met]
▪ Clothing index [clo]
1. What is Thermal Comfort
Thermal Comfort is a matter of many parameters
– NOT only the air temperature

6. 29 August 2020
6x factors: Mean radiant temperature [°C]
6
1. What is Thermal Comfort
If relatively small temperature differences
exist between the surfaces => linear form:

7. 29 August 2020
6x factors: Metabolic rate [Met]
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1. What is Thermal Comfort
Energy released by metabolism depend on
muscular activity.
Metabolism is measured in Met
(1 Met = 58.15 W/m2 of body surface).
A normal adult has a surface area of 1.7 m2,
and a person in thermal comfort with an
activity level of 1 Met will thus have a heat
loss of approximately 100W.

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6x factors: Clothing index [Clo]
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1. What is Thermal Comfort
1 Clo = Insulation value of 0.155 m2*C/W
Calculation of Clo-value

9. 29 August 2020
Any other factors? YES
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1. What is Thermal Comfort
6x main factors
▪ Age
Sensation of old people and younger people
▪ Adaptation
People in warm climates may adapt to hot
environment
▪ Sex
Women: lower skin temp., evap loss and lower
met. rate
Clothing and preferent of temp.

10. 29 August 202010
Method 1: Prediction of Thermal Comfort (PMV/PPD method)
Thermal Comfort can only be maintained when heat produced by
metabolism equals the heat lost from body.
Developed by Prof. P. O. Fanger (Denmark)
2. How to Design/Assess Thermal Comfort in Buildings

11. 29 August 202011
Method 1: Thermal Comfort ZONE
(PMV/PPD method)
ASHRAE Standard 55 (of USA) uses
the PMV model to set the
requirements for indoor thermal
conditions.
It requires that at least 80% of the
occupants be satisfied.
2. How to Design/Assess Thermal Comfort in Buildings

12. 29 August 202012
Method 1: Thermal Comfort ZONE
(PMV/PPD method)
CEN Standard: EN-16798 of Europe
2. How to Design/Assess Thermal Comfort in Buildings

13. 29 August 202013
Method 2: Adaptive Thermal Comfort
The adaptive model is based on the idea
that outdoor climate influences indoor
comfort because humans can adapt to
different temperatures during different
times of the year.
This method are also implemented in
ASHRAE Standard 55 and CEN
Standard: EN-16798
2. How to Design/Assess Thermal Comfort in Buildings
** Operative temperature: The temperature
sensed by people, takes into account not only
the temperature of the indoor air, but also the
temperature of the surfaces (floor, walls, ceiling
and windows).

14. 29 August 202014
3. Thermal Comfort in Tropical Climate (Vietnam)

15. 29 August 202015
3. Thermal Comfort in Tropical Climate (Vietnam)
T = 30*C
V = 1 m/s

16. 29 August 202016
4. Project References
Project 1:

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4. Project References
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4. Project References
18

19. 29 August 202019
4. Project References
Project 2:

20. 29 August 202020
4. Project References

21. 29 August 2020
linkedin.com/company/royal-haskoningdhv
@RHDHV
facebook.com/RoyalHaskoningDHV
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THANK YOU
Q&A
◼ Contact:
◼ MEng Le Luong Vang
◼ LEED AP, LOTUS AP, GBS EXPERT,
◼ Le.vang@rhdhv.com – 090 838 5689
◼ Website: www.royalhaskoningdhv.com