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Impact of Thermal Behaviour on Outdoor Human Thermal Comfort in Tropical Climate

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Impact of Thermal Behaviour on Outdoor Human Thermal Comfort in Tropical Climate IMPACT OF THERMAL BEHAVIOUR ON OUTDOOR HUMAN THERMAL COMFORT IN TROPICAL CLIMATE LEE YEE YONG A thesis submitted in fulfilment of the requirements for the award of the degree of Doctor of Philosophy (Civil Engineering) Faculty of Civil Engineering Universiti Teknologi Malaysia JUNE 2016 iii DEDICATION Dedicated to my beloved family members and husband, Yeong Huei iv ACKNOWLEDGEMENT The author would like to express her utmost gratitude to her supervisor, Assoc. Prof. Ir. Dr. Mohd Fadhil Md Din for his guidance and assistance throughput the study. The author also would like to thank Assoc. Prof. Dr. Zainura Zainon Noor and Prof. Dr. Kenzo Iwao for their continuity of supervision. Special thanks to Ministry of Higher Education Malaysia (MOHE) for providing scholarship to author by the channel of MyBrain15-MyPhD. All the expenses in this project was funded by several university's grants which were led by author's supervisor. External funding also given by ASSET Construction Inc., Tajimi General Constructors Association (TGCA) and Heat Island Solutions Global Asia Sdn Bhd. All the supports are gratefully acknowledged. The author sincere gratitude extend to Assoc Prof. Dr. Shamsuddin Shahid who had provided assistance and knowledge on statistical analysis in her research study. The author is fortunate to have her colleagues, Dr. Nickholas Anting Anak Guntor, Dr. Eeydzah Binti Aminudin and Dr. Low Wen Pei in sharing knowledge and the help in laboratory as well as field works. Last but not least, deepest appreciation to the author’s parents and friends for their moral supports throughout the ups and downs in completing this thesis. v ABSTRACT In recent years, the challenges of the urban environment have been identified as urban heat island phenomenon due to the impacts of thermal behaviour from the surrounding built-up environment, with a low surface albedo. Their impacts on individuals are getting worse due to improper urban building designs with albedo modification that changed thermal behaviour in cities which in turn affects the quality of thermal comfort, especially in tropical countries. Therefore, this research aims to evaluate human thermal comfort by developing a preferable range of Discomfort Index (DI) interpretation for tropical climate. Next, the study integrates the application of a Surrogate Human Sensor (SHS) with measurements of climatic variables. Following this, Heat Stress Index (HSI) and Thermal Comfort Index (TCI) are established, using the correlation of the thermal perception with SHS and climatic variables measurement for evaluating thermal comfort in outdoor spaces. In-situ field measurements were carried out to analyse the impacts of thermal behaviour and its relationship to human discomfort. Human discomfort levels were evaluated using Thom's DI and a new extended DI range of 20°C to 28.9°C for “partially comfortable”. It was proposed in association with local climate as a result of thermal adaptability. Outdoor thermal sensations for the outdoor environment can be assessed using questionnaire surveys and a SHS model that was initially developed as a sensor to receive data on the impacts of thermal behaviour. SHS significantly reflects the impacts of thermal behaviour from the surrounding ambient environment towards human skin surface and found to be useful as a simple sensor, or indicator, for pre-assessing thermal conditions and comfort. In this study, two factors, i.e. climatic and psychological factors, are taken into consideration. Within this combination, SHS acts like a sensor to predict the thermal responses of people with respect to the influence from climatic variables. Thermal perception regression models, which represent the HSI, and SHS temperature regression models were developed based on the local microclimate environment. With this correlation, TCI was established where it enhances the understanding of the relationship between human psychologies and the climatic environment using SHS. Then, the SHS can be used to identify the perception level of the people as the SHS correlated with the thermal perception and surrounding climate measurements. All the regressions established were verified through execution in the real case scenarios by comparing the observed and predicted outputs. These verifications have shown that the regressions may be suitably applied in all tropical climate locations, especially in Malaysia, to evaluate correctly outdoor thermal comfort. vi ABSTRAK Sejak kebelakangan ini, persekitaran bandar telah mengalami cabaran besar yang dikenal pasti sebagai fenomena pulau haba bandar yang disebabkan oleh kesan haba daripada permukaan pembinaan yang mempunyai albedo rendah. Kesannya semakin teruk disebabkan oleh rekabentuk bangunan bandar yang tidak mesra dengan pengubahsuaian albedo yang akan mempengaruhi kesan haba di bandar, seterusnya akan menjejaskan kualiti keselesaan haba terutama di negara-negara tropika. Oleh itu, kajian ini bertujuan untuk menilai keselesaan haba dengan membangunkan satu julat baru yang lebih sesuai untuk penentuan Indeks Ketidakselesaan (DI) pada iklim tropika. Seterusnya, kajian ini mengintegrasikan penggunaan “Surrogate Human Sensor” (SHS) dengan mengunakan nilai pembolehubah iklim. Di samping itu, Indeks Haba Tekanan (HSI) dan Indeks Keselesaan Haba (TCI) juga dirangka dengan menggunakan korelasi di antara persepsi haba dengan pengukuran pembolehubah iklim dan SHS untuk menilai keselesaan haba di persekitaran luar. Pengukuran di tapak telah dijalankan untuk menganalisis kesan haba dan kaitannya dengan ketidakselesaan manusia. Tahap ketidakselesaan manusia dinilai menggunakan Thom’s DI dan DI lanjutan baru dengan julat di antara 20°C hingga 28.9°C untuk "separa selesa". Ini adalah julat yang dicadangkan bagi iklim tempatan sebagai hasil penyesuaian haba. Selain itu, kepekaan haba untuk persekitaran luar boleh dinilai dengan menggunakan soal selidik dan SHS telah dibangunkan sebagai sensor untuk menerima data daripada kesan haba. SHS boleh mencerminkan kesan haba dari persekitaran ke permukaan kulit manusia dan didapati sangat relevan digunakan sebagai sensor mudah atau penunjuk untuk pra-penilaian keselesaan haba. Dalam kajian ini, dua faktor iaitu iklim dan psikologi juga diambil kira. Dengan gabungan ini, SHS bertindak sebagai sensor untuk meramalkan tindak balas haba terhadap pengaruh dari pembolehubah iklim. Regresi persepsi haba, yang juga diwakili oleh HSI, dan regresi SHS telah dibangunkan berdasarkan persekitaran kajicuaca tempatan. Menerusi korelasi ini, TCI akan dihasilkan serta ia dapat meningkatkan pemahaman antara hubungan psikologi manusia dengan persekitaran iklim menggunakan SHS. Dengan itu, SHS boleh digunakan untuk mengenalpasti tahap persepsi manusia kerana SHS menunjukkan korelasi yang nyata dengan persepsi dan pengukuran cuaca persekitaran. Semua regresi yang dijana disahkan melalui pelaksanaan senario kes sebenar dengan perbandingan output pemerhatian dan ramalan. Pengesahan ini telah menunjukkan regresi yang dijana boleh digunakan pada semua lokasi beriklim tropika, terutamanya di Malaysia, untuk penilaian keselesaan di persekitaran luar. vii TABLE OF CONTENTS CHAPTER TITLE PAGE DECLARATION ii DEDICATION iii ACKNOWLEDGEMENT iv ABSTRACT v ABSTRAK vi TABLE OF CONTENTS vii LIST OF TABLES xii LIST OF FIGURES xvii LIST OF EQUATIONS xxi LIST OF SYMBOLS xxii LIST OF ABBREVIATIONS xxiii LIST OF APPENDICES xxv 1 INTRODUCTION 1 1.1 Background of the Study 1 1.2 Problem Background 4 1.3 Objectives of the Study 6 1.4 Scope of the Study 7 1.5 Significance of the Study 9 1.6 Thesis outlines 10 2 LITERATURE REVIEW 12 2.1 Urban Built Environment 12 2.2 Thermal Behaviour of Urban Built Environment 13 2.3 Effect of Thermal Behaviour on Human viii Thermal Comfort 18 2.3.1 Human Thermal Comfort 19 2.4 Thermal Comfort Indices 22 2.4.1 Discomfort Index 23 2.4.2 Heat Related Illness 24 2.5 Surrogate Human Sensor – as the Simplified Thermal Manikin 27 2.6 Urban Heat Island (UHI) Phenomenon 30 2.6.1 Formation of UHI Phenomenon 33 2.6.2 Assessment on UHI Phenomenon 35 3 RESEARCH METHODOLOGY 41 3.1 Introduction 41 3.2 Analytical Parameters 43 3.2.1 Ambient temperature, Ta 43 3.2.2 Relative Humidity, RH 44 3.2.3 Solar Radiation Intensity, Ro 44 3.2.4 Wind Velocity, v 44 3.3 Instrumentation 45 3.3.1 Graphtec Midi Data Logger 45 3.3.2 Pyranometer 46 3.3.3 Wind Velocity Measurement 47 3.4.4 HOBO Data Logger (Temp/RH) 48 3.4 Surrogate Human Sensor Design 48 3.5 SHS Experimental Design 54 3.6 Experiment and Sampling Procedures 56 3.6.1 In situ Field Experiment Set Up 57 3.6.1.1 Data Collection 63 3.6.2 Thermal Perception Assessment 64 3.6.2.1 Questionnaire Survey in Putrajaya 69 3.5.3 Procedure of Discomfort Index Analysis 70 3.7 Analytical Procedure 70 ix 3.7.1 Statistical analysis 71 4 ANALYSIS ON OUTDOOR THERMAL COMFORT 76 4.1 Introduction 76 4.2 Field Study at Selected Locations 76 4.2.1 Vegetation Area and Built-Up Environment 77 4.2.2 Open Space and Built-up Environment 81 4.2.3 Building Orientations 84 4.3 Analysis of Outdoor Thermal Comfort 88 4.3.1 Relationship between Ambient Temperature and Relative Humidity 88 4.3.2 Discomfort Index at All Locations 92 4.3.3 New Interpretation of DI range 94 4.4 Discomfort Index based on New Predicted DI range 98 4.5 Concluding Remarks 101 5 SURROGATE HUMAN SENSOR ANALYSIS 103 5.1 Introduction 103 5.2 Surrogate Human Sensor Model 104 5.2.1 Surrogate Human Sensor and Human Skin Surface Correlation 104 5.2.2 Statistical Analysis for Model Validation 110 5.3 Relationship between Surrogate Human Sensor and Climatic
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