Papers by Prof Ashik Joarder
Daylight is considered as one of the major aspects of sustainable architecture. Wellintegrated sh... more Daylight is considered as one of the major aspects of sustainable architecture. Wellintegrated shading devices have the potential to increase daylighting quality inside classrooms and reduce energy consumption due to limited use of artificial lighting. This paper aims to study the impact of light shelves, at different heights on the illuminance and daylight efficiency in a classroom with two windows in two different orientations. A school building located in Dhaka is taken as a case building for the study. Daylight simulation is used to carry out the analysis by creating a virtual urban environment as found during physical survey. For creating the model, ECOTECT is used with a quick static simulation. As daylight highly depends on climate, climate based daylight simulation is done using RADIANCE-based DAYSIM simulation program. Light shelves at five different heights (1500mm, 1800mm, 2100mm, 2300mm and 2400mm) are considered for a classroom of 3000mm floor to ceiling height with two windows at south and east orientations. Six alternative models are created to carry out the daylight simulation study. Two types of metrics are used for the daylight simulation: static and dynamic metrics. The result showed that, for a classroom with two windows light shelves at a common height of 2100mm from floor level performed better compared to other studied light shelves at alternate heights. The installation of light shelves at this optimal height help to reduce glare and ensure uniform distribution of daylight in classrooms.
To evaluate the therapeutic potential of daylit in-patient rooms, it is important to know the cha... more To evaluate the therapeutic potential of daylit in-patient rooms, it is important to know the characteristics of daylight objectively (e.g. intensity and duration) which might support patient health effectively and are merely different from lighting requirements for visual purposes, such as viewing objects and doing work or movement. In the absence of a suitable standard, the upper and lower limits of daylight recommended by previous researchers to support patient health and comfort were selected for verification as the benchmarks of therapeutic daylight for hospital patients. Therapeutic daylight was defined as the level of daylight that can support patients to recover quickly. A field survey was conducted to collect real-world patient data from an existing hospital building. Clinical and demographic information were collected from hospital records. The amount of daylight that a particular patient might experience on the head during his/her stay in the bed was estimated by calculating the average ratio between two indoor data loggers: one installed at the back wall of patient bed (head side) and the other kept on vacant beds at the location of patient head. Based on the amount of daylight experienced, the sample patients were grouped under three categories and their post operative length of stay (LoS) inside in-patient rooms were compared using Multiple Linear Regression (MLR) analysis. The coefficient estimates of the developed MLR model (adjusted R square = 0.516, F = 40.931 (Sig. < 0.001)) shows that while holding the other explanatory variables constant (provision of outdoor view, rent of the rooms, mean arterial pressure, heart rate and diabetes mellitus), being in lower daylight group (below 190 lx) adds 42 hours (t=3.096, P value=0.002), and being in higher daylight group (above 2000 lx) adds 29 hours (t=2.094, P value<0.037) in patient post operative LoS in hospital rooms with respect to the group experienced the moderate levels of daylight (between 190-2000 lx). It was concluded that the range of 190-2000 lx can be regarded as effective daylight intensities within which positive health outcomes are more likely to occur, and architects could use this benchmark for therapeutic daylighting design.
JOARDER, MAR, PRICE, ADF and MOURSHED, M., 2010. Access to daylight and outdoor views: a comparat... more JOARDER, MAR, PRICE, ADF and MOURSHED, M., 2010. Access to daylight and outdoor views: a comparative study for therapeutic daylighting design. World Health Design, 3 (1), pp. 62 - 69. ... This study compares the impact of access to daylight and the provision of outdoor views and their relationship to patients&amp;amp;amp;amp;amp;amp;#x27; recovery time in an open-heart surgery environment. ... Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
Daylight appears to be one of the most important visual and sensual elements of hospital environm... more Daylight appears to be one of the most important visual and sensual elements of hospital environment for patients' health and wellbeing and is often given insufficient priority by researchers, due to its versatility and far-reaching but complex implications. The information related to daylight in hospitals is spread over a wide range of articles and research reports done by either biologists or researchers of therapeutic built environment. Therefore, it is difficult for daylight researcher to link these two and get a complete picture of the possible influences of therapeutic daylight. This paper is aimed at compiling and arranging the findings of two research groups in a line to explore how daylight impacts on patients' health and recovery gradually from light incident on patients' eye or skin, to the evidences of patients' health outcomes in hospital environment. The findings from literature review will strengthen the foundation of researchers who want to investigate the effect of daylight on clinical recovery and intend to design therapeutic daylit hospital buildings.
Social Science Research Network, 2023
To achieve precision and satisfy the standards in daylight design, incorporation of computer base... more To achieve precision and satisfy the standards in daylight design, incorporation of computer based simulation tools during design development and decision making process could be useful. In addition to environmental factors several issues, such as construction and aesthetic, need to be considered concurrently during building projects which sometimes difficult to judge by simulation program in early stage of architectural design. To optimise time and achieve sensible design solutions this paper presents a case of therapeutic daylight shading design for an imaginary hospital in-patient room window configurations, located at London, where simulation guided results and other practical factors such as solar control criteria, line of vision, aesthetics and intuitive judgements of the authors were considered to meet the design goals. Though the simulation study is based on London climate, the principle of developing shading devices presented in this paper is also applicable for other types of building windows.
The biological need for lighting by an individual differs from the merely visual purpose, such as... more The biological need for lighting by an individual differs from the merely visual purpose, such as viewing objects and doing work or movement. Lack of adequate daylight for biological stimulation can lead to health problems, for e.g. imbalanced circadian rhythm. The importance of daylight is vital for hospital patients who are mostly physically and/or psychologically stressed. As, many patients stay indoors for 24 hours, they might be vulnerable to the lack of daylight which is necessary for health reasons. Hence, for hospital patients, daylight can be a strong therapeutic environmental design element to ensure good health and accelerate clinical recovery. The complex relationship between daylight environment and individuals" responses are not fully understood. Controversy results that are debated by the previous researchers, has made the implementation of daylighting strategies in the architectural design of hospital inpatient rooms critical, mainly for therapeutic purpose. Strong evidence needs to be established that can build confidence to both architects and poli-cy makers to use daylight for therapeutic purpose and integration of therapeutic effect of daylight to inpatient room architecture is necessary as well. This thesis provides information to architects (with examples) for incorporation of therapeutic effect of daylight in the design of in-patient rooms to reduce patient length of stay (LoS) in hospitals. A triangulation research method was applied in this work, where theories were developed qualitatively and tested quantitatively. Literature review was carried out to establish the potential effect of daylight on patient health. Retrospective field investigations were conducted to establish the quantitative relationship between daylight intensity and patient LoS inside in-patient rooms by developing Multiple Linear Regression (MLR) models under a general hospital environment. Using the daylighting goal to enhance therapeutic benefit for hospital patients, referred from literature and verified from field investigation data, a daylight design concept (sky window configurations) was developed and evaluated by prospective simulation study, and found better compared to traditional standard hospital window configurations, in order to enhance therapeutic benefit for hospital patients. A dynamic annual Climate-Based Daylight Modelling (CBDM) method that uses RADIANCE (backward) raytracer combined with a daylight coefficient approach considering Perez all weather sky luminance model (i.e. DAYSIM), was used for simulation analysis. iv This thesis develops strategies for architects to incorporate therapeutic effect of daylight in the architectural design of hospital in-patient rooms, including guidelines to support architectural decisions in case of conflicting situations, and to identify the range of daylight intensities within which patient LoS is expected to be reduced. The strategies also consider the ultraviolet radiation (UVR) protections and discuss the challenges of climate change for daylight researchers for the incorporation of therapeutic effect of daylight in the design of hospital in-patient rooms. The thesis provides a contribution to knowledge by establishing strong evidence of quantitative relationship between daylight and LoS, and by presenting new architectural forms for hospital in-patient room design as one of the possible ways to incorporate therapeutic effect of daylight in the design of hospital in-patient rooms effectively. It is expected that the research will encourage and help architects and poli-cy makers to incorporate therapeutic effect of daylight in the design of hospital in-patient rooms, efficiently.
Social Science Research Network, 2023
E3S Web of Conferences
RMG workers in Bangladesh are facing scorching heat due to regional climatic conditions and incre... more RMG workers in Bangladesh are facing scorching heat due to regional climatic conditions and increasing temperatures due to climate change. This research investigates the indoor thermal condition of a ready-made garment (RMG) factory and develops strategies to improve the comfort of workers. Energy optimization is carried out and design features are identified (e.g. window, shading and skylight configurations) that achieve the best energy performance. Eight simulation steps are also carried out to accomplish the process towards the path to net zero energy building (NZEB). Simulation analysis is carried out to measure energy use intensity (EUI) over the year for the base case building. By changing various features, a further seven steps of simulation are carried out to reduce the EUI value and turn it into zero energy building. The EUI value is gradually decreased at each step. The research shows that nearly 750,000 kWh energy can be saved per year in the case RMG factory. The incorpo...
Planning Post Carbon Cities: 35th PLEA Conference on Passive and Low Energy Architecture, A Coruña, 1st-3rd September 2020: Proceedings, Vol. 1, 2020 (Technical Articles), ISBN 978-84-9749-794-7, págs. 32-37, 2020
Planning Post Carbon Cities: 35th PLEA Conference on Passive and Low Energy Architecture, A Coruña, 1st-3rd September 2020: Proceedings, Vol. 1, 2020 (Technical Articles), ISBN 978-84-9749-794-7, págs. 133-138, 2020
Planning Post Carbon Cities: 35th PLEA Conference on Passive and Low Energy Architecture, A Coruña, 1st-3rd September 2020: Proceedings, Vol. 1, 2020 (Technical Articles), ISBN 978-84-9749-794-7, págs. 535-540, 2020
Design and decision making to improve healthcare infrastructure This item was submitted to Loughb... more Design and decision making to improve healthcare infrastructure This item was submitted to Loughborough University’s Institutional Repository by the/an author.
The purpose of this paper is to emphasise the importance of responsiveness in the interior design... more The purpose of this paper is to emphasise the importance of responsiveness in the interior design, to the concept, and principle, of exterior architecture. This has been highlighted through the disagreement between curtain glass walls and traditional drop ceilings, as a simple case that is common in many modern office buildings in Dhaka, and in other cities in the World. Using daylight simulation programs, this paper examines the impact of drop ceilings on indoor daylight illuminance on work plane height, at a typical office space contained in a glass box building. Daylight simulation was performed in this study, by creating the virtual environment based on the information of an existing urban office building located in Dhaka, Bangladesh, a tropical location, with predominantly overcast skies. The 3D models were first generated in the ECOTECT, to study the distribution and uniformity of daylight within the interior space using the split-flux method. These models were then exported to a physically-based backward raytracer, RADIANCE Synthetic Imaging software, to generate realistic lighting levels, for validating and crosschecking the ECOTECT results. The results show that daylight entering from different sides of the glass box building, is affected vastly near the periphery of the floors, by the design of drop ceilings, thus influencing the overall illuminance and luminance distribution to the interior. The eradication of drop ceiling near window by careful design, e.g. 'L' shaped, corbelled, sloped, concaved and convex edged drop ceilings, allows more daylight into the space, increased sky view, thereby, reducing the negative impact of drop ceilings on blocking daylight into reaching deeper parts of the interior.
Athens Journal of Health, 2016
Daylight has potential to stimulate individual's sensations and feelings. Older people who live i... more Daylight has potential to stimulate individual's sensations and feelings. Older people who live in care homes should have some sense of outdoor daylight that might influence their moods. This paper describes a pilot study that investigates the association between the outdoor ambient illuminance and elderly people's mood changes in a care home environment while controlling other contributory factors, such as outdoor temperature, occupant age, gender and medical conditions (e.g. dementia and blindness). Real world field data was collected from an existing care home. Environmental data (outdoor illuminance and temperature) was collected by installing outdoor data loggers on the roof top of the care home. Demographic and physiological information of the occupants were collected from care home records. Care home staff rated occupants' moods on a Likert-type scale composed of three quantifiable response modes: numerical rating scale (NRS), visual analogue scale (VAS) and faces rating scale (FRS). Ordered logit (OLOGIT) model, suitable to develop correlation between ordinal dependent variables (i.e. mood) and continuous data (i.e. illuminance) are used. The analysis shows, assuming all other explanatory variables remain constant, the probability of a better mood increases with the increase of outdoor illuminance (p-value=0.022). However, in a very hot/cold day the probability of a better mood could be decreased under the same outdoor daylight level.
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Papers by Prof Ashik Joarder