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Dr. Maryam Khoshbakht
Griffith University, QLD, Australia

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0 Energy & the Environment
0 Thermal Comfort
0 Energy benchmark
0 Indoor environmental quality
0 green buildings

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Research article
Published: 26 March 2020 in Indoor and Built Environment
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The influence of work groups (the number of occupants sharing an office) on occupant satisfaction with workplace environments was compared between commercial buildings and academic buildings. Using the Building Use Studies (BUS) methodology, a sample of 5000 surveys was collected over a 12-year period from 67 buildings around the world. In both academic and commercial buildings, solo offices (single occupant) obtained the best scores regarding productivity, overall comfort and health. Academics most disliked middle-sized open-plan offices (shared by 6 to 9 occupants), while in commercial buildings, office occupants most disliked large open-plan offices (shared by over 9 occupants). Occupants had higher productivity and perceived health in commercial buildings than those in academic buildings in all work groups. Productivity decreased as the number of occupants in the office increased in both academic and commercial buildings for all work groups except for middle-sized open-plan offices. Age had a significant influence on occupant perception in different work groups, when comparing commercial and academic buildings. Trivial differences regarding the effect of gender on occupant perception in commercial and academic buildings were also identified. The findings of this study points to the significance of office sharing in influencing high-performance working environments, especially in relation to open-plan layouts.

ACS Style

Maryam Khoshbakht; George Baird; Eziaku Rasheed. The influence of work group size and space sharing on the perceived productivity, overall comfort and health of occupants in commercial and academic buildings. Indoor and Built Environment 2020, 30, 692 -710.

AMA Style

Maryam Khoshbakht, George Baird, Eziaku Rasheed. The influence of work group size and space sharing on the perceived productivity, overall comfort and health of occupants in commercial and academic buildings. Indoor and Built Environment. 2020; 30 (5):692-710.

Chicago/Turabian Style

Maryam Khoshbakht; George Baird; Eziaku Rasheed. 2020. "The influence of work group size and space sharing on the perceived productivity, overall comfort and health of occupants in commercial and academic buildings." Indoor and Built Environment 30, no. 5: 692-710.

Journal article
Published: 15 May 2019 in Energy and Buildings
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Change-over mixed-mode buildings prevent the concurrent use of air-conditioners and operable windows, thus are energy-efficient. Based on automation levels for mixed-mode control, change-over mixed-mode buildings can be classified into three types: automated, semi-manual, and manual. The objective of this research was to conduct a pilot study on the effects of different change-over mixed-mode control strategies on building occupants' thermal perception and comfort, as well as develop adaptive comfort models for mixed-mode buildings with different change-over control strategies in subtropical climates. Occupants from three types of mixed-mode control buildings were surveyed about their real-time thermal perception, while indoor environmental conditions were recorded simultaneously for a period from summer to winter. Although an overlooked factor in previous studies, this pilot study suggests that change-over control strategy may significantly affect thermal perceptions in mixed-mode buildings. Occupants who had limited control over thermal environments showed less sensitivity to outdoor conditions regardless of operation modes. In buildings where, users had a full control, a clear distinction in thermal sensation was observed when the system switched between air conditioning and natural ventilation modes. The adaptive thermal comfort model seems to be more suitable and applicable for semi-manually and manually controlled mixed-mode buildings rather than for automatically controlled mixed-mode buildings.

ACS Style

Maryam Khoshbakht; Zhonghua Gou; Fan Zhang. A pilot study of thermal comfort in subtropical mixed-mode higher education office buildings with different change-over control strategies. Energy and Buildings 2019, 196, 194 -205.

AMA Style

Maryam Khoshbakht, Zhonghua Gou, Fan Zhang. A pilot study of thermal comfort in subtropical mixed-mode higher education office buildings with different change-over control strategies. Energy and Buildings. 2019; 196 ():194-205.

Chicago/Turabian Style

Maryam Khoshbakht; Zhonghua Gou; Fan Zhang. 2019. "A pilot study of thermal comfort in subtropical mixed-mode higher education office buildings with different change-over control strategies." Energy and Buildings 196, no. : 194-205.

Journal article
Published: 25 March 2019 in Buildings
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Purpose—The purpose of this article is to present evidence of occupants’ perception of their work environment in five different office types (Solo, Duo, 2–4, 5–8 and 8Plus offices). The study examined the influence of the number of office occupants on individual perception of indoor environment quality (IEQ) in office environments. Design/methodology/approach—A dataset of 5000 respondents in 67 commercial and institutional office buildings was analysed using IBM SPSS v23. The dataset contained user response on the BUS Methodology questionnaire that is designed to retrieve occupants’ perception of their work environments. Analysis of Variance (ANOVA) and multiple regression analysis were conducted to calculate the impact of the office environment on occupants’ perception of comfort and productivity. Findings - This study showed that occupants in Solo and Duo offices perceived higher satisfaction with their environment (except for temperature in summer), better health and productivity; and more control over the office environment than those in 5–8 and 8Plus offices. Occupants in 8Plus offices were most satisfied with the temperature in summer. It was also noted that the IEQ factors that predicted comfort were observed to not predict productivity. Noise was the only IEQ factor that had predictive power for both comfort and productivity in all the office spaces. Originality/value—This article provides intriguing findings on occupants’ perception of various types of office environment that contributes significantly to the debate on open-plan versus cellular office environments.

ACS Style

Eziaku Onyeizu Rasheed; Maryam Khoshbakht; George Baird. Does the Number of Occupants in an Office Influence Individual Perceptions of Comfort and Productivity?—New Evidence from 5000 Office Workers. Buildings 2019, 9, 73 .

AMA Style

Eziaku Onyeizu Rasheed, Maryam Khoshbakht, George Baird. Does the Number of Occupants in an Office Influence Individual Perceptions of Comfort and Productivity?—New Evidence from 5000 Office Workers. Buildings. 2019; 9 (3):73.

Chicago/Turabian Style

Eziaku Onyeizu Rasheed; Maryam Khoshbakht; George Baird. 2019. "Does the Number of Occupants in an Office Influence Individual Perceptions of Comfort and Productivity?—New Evidence from 5000 Office Workers." Buildings 9, no. 3: 73.

Review
Published: 01 April 2018 in Habitat International
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Green buildings not just help to reduce energy and resource consumption, but also to improve user experience and satisfaction. The former relies on technical advancement, while the latter needs empirical evidence. In the past decades, numerous post-occupancy studies have been conducted to investigate green building occupant satisfaction in different regions; however, a systematic review of these studies is lacking. This study reviews the global evidence to examine whether green buildings are more satisfactory than non-green buildings. The performance of green buildings in terms of occupant satisfaction appeared to be inconsistent, varying from study to study. The evidence on green buildings outperforming non-green counterparts is inconclusive. Sample size, occupancy period and green features are discussed as the main bias accounting for the inconsistency of the global evidence. In spite of the inconsistency and inconclusiveness, this study identifies two global contexts: the Occident (mainly U.S. and U.K.), where no significant differences were found on occupant satisfaction between green and non-green buildings, and the Orient (mainly China and South Korea), where green building occupants showed significantly higher satisfaction compared to non-green building occupants. This paper contributes to the understanding of socio-economic factors underlying green building occupant satisfaction, and also provides evidence for commercial and institutional sectors, where green buildings are used to improve employee satisfaction.

ACS Style

Maryam Khoshbakht; Zhonghua Gou; Yi Lu; Xiaohuan Xie; Jian Zhang. Are green buildings more satisfactory? A review of global evidence. Habitat International 2018, 74, 57 -65.

AMA Style

Maryam Khoshbakht, Zhonghua Gou, Yi Lu, Xiaohuan Xie, Jian Zhang. Are green buildings more satisfactory? A review of global evidence. Habitat International. 2018; 74 ():57-65.

Chicago/Turabian Style

Maryam Khoshbakht; Zhonghua Gou; Yi Lu; Xiaohuan Xie; Jian Zhang. 2018. "Are green buildings more satisfactory? A review of global evidence." Habitat International 74, no. : 57-65.

Journal article
Published: 26 March 2018 in Buildings
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This paper focuses on thermal environmental conditions in the stone dwellings of a Tibetan village in Danba County, Sichuan, China, in winter. During the study, field measurements and subjective survey studies were collected, simultaneously, to provide a comprehensive understanding of the thermal comfort conditions that were experienced by residents in cold rural areas of Sichuan. Subjective surveys involved questions about thermal comfort perceptions and acceptability in cold conditions. The status of thermal comfort and characteristics of indoor environmental qualities were investigated in the study. The majority of survey participants (47% and 74%) voted as “slightly cool” for temperature, and “slightly dry” for humidity in the studied typical winter days, respectively. The available adaptive opportunities for the residents were investigated through the survey studies. Adjusting clothing, drinking hot beverages, blocking air infiltration through windows, and changing activities were the most common adaptive measures. An adaptive coefficient (λ) was determined based on adaptive predicted mean votes (aPMV) models using least square methods to assess the different adaptation measures in the region. Findings of this study provided a valuable reference for thermal comfort adaptations in cold climates, where limited adaptive opportunities were available due to the low standard of living.

ACS Style

Bin Cheng; Yangliu Fu; Maryam Khoshbakht; Libin Duan; Jian Zhang; Sara Rashidian. Characteristics of Thermal Comfort Conditions in Cold Rural Areas of China: A Case study of Stone Dwellings in a Tibetan Village. Buildings 2018, 8, 49 .

AMA Style

Bin Cheng, Yangliu Fu, Maryam Khoshbakht, Libin Duan, Jian Zhang, Sara Rashidian. Characteristics of Thermal Comfort Conditions in Cold Rural Areas of China: A Case study of Stone Dwellings in a Tibetan Village. Buildings. 2018; 8 (4):49.

Chicago/Turabian Style

Bin Cheng; Yangliu Fu; Maryam Khoshbakht; Libin Duan; Jian Zhang; Sara Rashidian. 2018. "Characteristics of Thermal Comfort Conditions in Cold Rural Areas of China: A Case study of Stone Dwellings in a Tibetan Village." Buildings 8, no. 4: 49.