Rizki Armanto Mangkuto

Rizki Armanto Mangkuto
Bandung Institute of Technology | ITB · Engineering Physics

Dr. Ir., ST, MT, IPM

About

84
Publications
33,930
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
528
Citations
Additional affiliations
May 2018 - present
Bandung Institute of Technology
Position
  • Professor (Assistant)
April 2015 - present
Bandung Institute of Technology
Position
  • Lecturer
April 2015 - present
Bandung Institute of Technology
Position
  • Lecturer

Publications

Publications (84)
Article
Full-text available
Variation of correlated colour temperature (Tc) of tuneable LED lamps are thought to have a significant effect on red-yellow and blue colour shades, compared to the green one. The phenomenon is expected to be better explained by observing lightness, hue, and chroma (L*C*h°). However, attempts to map the impact of Tc variation on the shift in colour...
Article
Full-text available
External shading devices are an important design feature in tropical buildings, particularly for climate mitigation. However, the interaction between the depth and elevation of the shading devices and their impact on indoor daylight performance is not fully understood, especially for the case of tropical buildings with bilateral openings. This stud...
Article
Full-text available
The Greenery-View factor has been recently proposed as a new, simple measure to assess the possibility of having visual access to view the outdoor greenery in a daylit building space, based on the constructed lines of sight. However, detailed expressions to compute the factor is yet to be provided, and correlations with the input variables are yet...
Article
Full-text available
In lighting design, mean room surface exitance (MRSE) has been known as an indicator of the adequacy of illumination in an indoor space. Recent studies have suggested an exponential model relating MRSE and the observer’s retinal response. This is particularly applicable in a room with homogenous room surface reflectance and a constant total corneal...
Chapter
Investigations of direct sunlight inside school classrooms in Indonesia are currently missing. This study therefore investigates the availability of direct sunlight inside several state elementary school classrooms in Banda Sakti region of Lhokseumawe, Indonesia. Daylight in the location is abundantly available, thus, there is a risk of excessive d...
Article
Full-text available
Optimisation of shading devices in buildings is a broadly investigated topic; however, most studies only focus on a single façade orientation, since the observed buildings are typically located in high latitude regions. However, in tropical regions, optimisation of all façade orientations is required due to the relatively high solar radiation and l...
Article
Full-text available
This study evaluated the building performance of a hypothetical elementary school classroom considering its annual energy consumption, daylight criteria, and adaptive thermal comfort in Lhokseumawe, Indonesia. Variations in building materials, construction, and horizontal shading features were evaluated for the most optimal design solution. The aim...
Article
Full-text available
In daylighting design, variation of building façade thickness (f ) will result in variation of the daylight opening areas, which in turn will modify the values of daylight metrics within the space. However, studies dedicated to investigating the impact of varying f on indoor daylight metrics are relatively scarce. This study, therefore, aims to ass...
Article
Full-text available
Pencahayaan alami siang hari (PASH) ialah unsur krusial untuk dipertimbangkan pada desain bangunan karena dua manfaat besar yaitu efisiensi energi dan peningkatan kinerja dan kesehatan pengguna. Di Indonesia hanya terdapat satu regulasi yang mengatur tentang PASH dalam bangunan, yaitu Standar Nasional Indonesia (SNI) SNI 03-2396-2001. Selain belum...
Book
Full-text available
Desain bangunan adalah suatu proses kompleks yang melibatkan beragam parameter yang perlu dipertimbangkan. Salah satu aspek yang menjadi perhatian utama pada praktik desain bangunan saat ini adalah kinerja bangunan, terutama terkait dengan tantangan penghematan energi, pemanfaatan sumber energi baru dan terbarukan, serta peningkatan kinerja dan kes...
Article
Full-text available
The concept of illumination vector quantities at a given point in three-dimensional space has been proposed since long time ago, but it is mostly described for scenes with point light sources. In real scenes with area light sources, numerical approximations are required to estimate the illumination vector quantities, which can be done by discretisi...
Article
Full-text available
The appearance of objects in interior lighting scenarios is determined by spectral characteristics of the light sources and of the interior finishing material surfaces. Within recent developments of tunable LED lamps, it is possible to vary the correlated color temperature (CCT) of the sources; however, it is relatively unknown whether such variati...
Conference Paper
Full-text available
Lighting design has become an important major factor in building construction planning. Optimum lighting is required to achieve an adequate visual performance while reducing visual discomfort, particularly, when executing tasks that require high accuracy, such as an Emergency Room in a hospital. This paper aims to propose an optimized electric ligh...
Conference Paper
Full-text available
This paper aims to report results and lesson learned from students assignments in integrating thermal, energy, lighting, and acoustic performance in a building simulation project. The objectives are to observe the students approach in obtaining the baseline, target, and optimum performance in all mentioned aspects, and to analyse the differences be...
Article
Full-text available
This study investigated twenty-two (22) state elementary schools, regarding daylight annual illuminance in the classrooms, using climate-based daylight modelling (CBDM) metrics. This is due to the missing information on the annual daylight performance inside the classroom in Indonesia. Over 250 classrooms were assessed using Rhinoceros and Grasshop...
Article
Full-text available
Direct horizontal illuminance along a calculation row due to two parallel arrays of large numbers of identical light sources behaves like a periodic signal with a sinusoidal pattern, which contains useful information for design purpose. This study aims to describe, verify, and discuss the theoretical concept on the superposition of direct horizonta...
Article
Full-text available
The use of integrating sphere has been known as a method to measure hemispherical reflectance of a material sample. Mathematical expressions of such reflectance are available in literature, but most of them are not explicit in describing the relation between reflectance and the relevant input variables. This study aims to derive closed-form express...
Article
Full-text available
Exposing oneself to outdoor daylight in the morning can be healthy and harmful at the same time, due to the risk of ultraviolet exposure. The presence of surrounding buildings in the urban context may also influence the risk. This study aims to identify the impact of courtyard and street canyon surroundings of various size and heights on the peak t...
Article
Full-text available
Studi ini melakukan optimasi pengaruh rotasi (α) dan lebar bilah (l) pada fasad bilah horizontal untuk pencahayaan alami yang optimal di Kota Lhokseumawe. Sebuah ruang belajar sekolah dasar hipotetik tanpa konteks dimodelkan secara komputasional kemudian diuji dengan metrik UDI. Metode optimasi dengan Genetic Algorithm (GA) dengan Galapagos digunak...
Article
Full-text available
The cubic illuminance concept has long been proposed to indicate light modelling in three-dimensional space. An issue relatively less discussed with regard to its measurement is the potential error due to the finite size of the cube centred at the reference point, yielding a parallax effect. In short, the measured cubic illuminance around a finite-...
Conference Paper
Full-text available
This paper presents a comprehensive sensitivity analysis on daylighting, visual comfort, and energy consumption of automated venetian blinds for open-plan offices. This research is using an integrated thermal and lighting simulation model in Grasshopper. The purpose is to identify which factors significantly affect daylighting level, visual comfort...
Book
Full-text available
Pada konsep desain dan operasional bangunan saat ini, telah diketahui pentingnya pemahaman atas fisika bangunan, yaitu segala sesuatu yang terkait dengan aspek-aspek fisis, khususnya terkait termal, pencahayaan, dan akustik pada suatu lingkungan binaan, baik ruang dalam maupun ruang luar, yang bertujuan menyediakan lingkungan yang sehat, nyaman, da...
Conference Paper
Full-text available
Anidolic Daylighting System (ADS) is a light guide system that can distribute daylight into a room, using a horizontal duct or pipe. In designing such a system, computational modelling and simulation are a powerful tool to predict its performance. In that case, it is important to ensure that all relevant simulation parameters have been defined appr...
Conference Paper
Full-text available
In this study, the genetic algorithm method is adopted to optimise the ellipsoid parameters of faceted reflector; i.e. solid angles of θ and ϕ, semi-latus rectum (d), and eccentricity (e). There are two types of reflector which designed in this study, those are divergent and convergent. Both designs are verified through simulation with the target o...
Conference Paper
Full-text available
Wind catcher is natural ventilation device that is commonly used in buiding in various Middle East countries, intended to work as passive cooling and ventilation system. However, the geometry of wind catcher which is an opening to the outside environment make it also potential to function as daylight distributor in buildings. This paper investigate...
Article
Full-text available
The use of Fourier components analysis has been recently proposed by Lynes to describe harmonics in vertical illuminance at various azimuth angles around a reference point. In cases with multiple light sources, it has been argued that the removal of even harmonics in the resulting Fourier components may correspond with good lighting practice. This...
Book
Full-text available
INDONESIA Pencahayaan alami dalam bangunan telah lama diketahui memiliki kontribusi besar tidak hanya dalam mengurangi penggunaan energi, tetapi juga dalam memberi pengaruh positif terkait dengan kesehatan dan kesejahteraan penghuni. Ditinjau dari segi kerekayasaan, tantangan utama yang dihadapi dalam konteks desain pencahayaan alami dalam bangunan...
Conference Paper
Full-text available
Current daylighting simulation practice often ignores the importance of façade thickness, despite its real influence on the total building performance. This research therefore aims to determine the effect of various facade thickness on daylight performance in a simulated reference office. An isolated reference office with an unglazed opening on one...
Conference Paper
Full-text available
The use of daylight offers a positive contribution to building energy savings yet also provoke a shortfall anticipation such as the large amount of light and visual discomfort. Moreover, building energy demand will also depend on the lighting control system combined with occupants' behaviour of which is still rarely studied. This paper addressed th...
Article
Full-text available
Electric lighting in indoor sport halls is essential for providing sufficient amount of light required for the sport activities, while maintaining visual comfort for the occupants. To do so, design optimization of the lighting system is often necessary. This study provides an example of design optimization for electric lighting system in the case o...
Article
Full-text available
The quality of lighting in a room will affect visual comfort. It is determined by light beam that hits observer's eyes generating a specific response. Meanwhile, the indicator that represents visual comfort is glare, especially discomfort glare. Glare index in a room, one of them, is stated by Unified Glare Rating (UGR) value affected by the ratio...
Article
Full-text available
Cylindrical illuminance has long been known as a metric of light modeling in three-dimensional space. Though it is possible to employ a dedicated meter to measure this metric, it is considered more practical to measure cubic illuminance data on the field. However, the cubic illuminance method is an approximation, which may yield errors relative to...
Article
Full-text available
Penelitian ini dilakukan untuk mendemonstrasikan suatu metode optimisasi perletakan dan penjadwalan sistem pencahayaan dalam ruang, dalam rangka meningkatkan eksitansi rata-rata permukaan dalam ruang (MRSE) dan metrik otonomi cahaya alami (DA), serta menurunkan konsumsi energi pencahayaan tahunan. Dua ruang laboratorium uji beton yang berlokasi di...
Conference Paper
Daylight performance in indoor spaces nowadays are commonly represented by the currently emerging climate-based daylight metrics (CBDM), which can be directly predicted using sophisticated daylight simulation tools. Several alternative simulation tools are not capable to directly simulate the CBDM but are capable to simulate point-in-time illuminan...
Conference Paper
Full-text available
The concept of colour mixing in the CIE XYZ colour space for light sources has long been known; however, experimental validations with actual sources are seldom reported. This paper aims to validate the concept with light-emitting diode (LED)-based lamps that are commonly available in the Indonesian market. The methods are as follows: Three bulb-ty...
Conference Paper
Full-text available
Lighting in buildings allows the occupants to do their task properly, but light with very high intensity may cause visual discomfort. Therefore, lighting in buildings, particularly the ones with high visual demand such as hospitals, should be designed to achieve specific room requirement and standard. This study aims to propose an optimized artific...
Article
Full-text available
In a previous study comparing alternative approaches for determining scalar illuminance from cubic illuminance data, the approach using mean spherical semi-cubic illuminances (representing the positive and the negative x, y, z axes) was found to have the highest accuracy. However, this approach, referred as Approach 2, becomes less accurate as more...
Article
Full-text available
In daylighting design for buildings, provision of solar shading device is required to ensure satisfaction of the visual comfort criteria in response to the sky condition. However, since real sky is constantly changing, the optimum state of the shading device would ideally be adaptive and dynamic, thus no single optimum solution can be expected. In...
Conference Paper
Full-text available
An experiment on preference of lighting qualities has been conducted using six Light-Emitting Diode (LED) lamps with various Duv values. The Duv is defined as perpendicular distance of u,v chromaticity coordinates from Planckian locus in CIE-1960. From colorimetric measurements, it was obtained that Duv of those lamps varied as follows: −0.0092, −0...
Conference Paper
Full-text available
The objective of this research is determining empirical model and criteria for luminance-based metrics that influence visual comfort in a semi-open plan office in Indonesia, using HDR imaging techniques and post-occupancy evaluation. A total of 30 data of post-occupancy evaluation were paired with measurement data taken under daylight condition, in...
Article
Full-text available
Various luminance-based metrics for lighting in an open-plan examination room under overcast daylight condition were optimised with regard to psychophysiological responses of dentists. A series of high-dynamic-range images of a dummy head with artificial teeth in various daylit scenes were collected, post-processed and statistically analyzed with H...
Conference Paper
Full-text available
Experiment used single chip of high power Light-emitting Diode (LED) was conducted to construct a model of color mixing. The used LED consisted of red-green-blue (RGB) components and formed into simple bulb prototype. The light intensity of each color could be adjusted by Arduino type microcontroller, with variation input levels from 0 to 250. It w...
Technical Report
Full-text available
Article
Full-text available
Design optimisation problems of window size in buildings with regard to energy saving and comfort criteria have been investigated many times. To indicate daylight availability and energy consumption in indoor spaces, a number of metrics have been proposed, but so far there is no convention on which daylight and energy metrics are preferred. Meanwhi...
Article
Full-text available
Studies on user acceptance of Light-Emitting Diode (LED) lighting were largely done in developed countries, while there are presumably significant differences between the developed and developing countries. Series of measurements of various domestic LED lamps in Indonesia were conducted to investigate the effects of varying illuminance (Eav), Corre...
Conference Paper
Full-text available
This experiment was conducted using light-emitting diode (LED) with tunability in red-green-blue (RGB) components. Light intensity of each component was set by Arduino microcontroller within variation steps of 25 to 250. The results showed that variation of green component affected the flux luminous and chromaticity coordinates values.
Article
Full-text available
A method for calculating scalar illuminance using cubic illuminance values in a light field has been proposed in the literature. This enables exact measurement of the illuminance vector direction and magnitude by a fixed device, as well as providing a useful basis for calculation. However, the method yields an inexact estimate of the scalar illumin...
Article
Full-text available
A mirror box type artificial sky for simulating the CIE standard overcast sky has been designed and constructed, while the verification method has been developed and tested. Ratio between the mirror height above the workplane and the room length is 60:133 or 0.451, whereas the ratio between the mirror height above the workplane and the room width i...
Article
Full-text available
This study was conducted to optimise daylight admission as ambient lighting in an open-plan examination room of a dental hospital in Bandung, Indonesia. Parametric design was conducted for new light shelves, to be placed on the east and west façades of the building. Optimisation was performed using genetic algorithm, taking into account the externa...
Article
Full-text available
Tunnel lighting during the day is very dependent on sunlight, especially access zones and threshold zones. The intensity of light in the zone must be able to compensate for the intensity of sunlight in front of the tunnel. For that artificial lighting will be placed in the access zone and the threshold zone must be arranged according to the presenc...
Article
Full-text available
The use of daylighting can minimize energy consumption in buildings. However, people's perception to daylight can be varied for a space that has multiple facades in several orientations. Therefore, assessments should be conducted to predict the correlation between daylight availability metrics and subjective perception of the building occupants. In...
Article
Full-text available
This article reports the actual performance of a newly-renovated dark chamber in the Engineering Physics Program, Institut Teknologi Bandung, by measuring the photometric and colorimetric characteristics of a high-bay and a street luminaire. Both luminaires had light-emitting diodes (LED) as their light sources. The dark chamber has dimensions of 1...
Article
Full-text available
The use of daylight in buildings should consider the aspect of visual comfort, since productivity of building occupants is affected by visual comfort. This research focuses on studying visual comfort under daylight condition in a reading hall of the Main Library Building of Institut Teknologi Bandung. An assessment was conducted with measuring dayl...
Article
Full-text available
Lighting for pitch area of a football stadium is an important aspect to consider in the design and operation phase. Despite the provided guidelines and regulations, actual conditions of lighting and visual comfort in stadiums are seldom reported. This article discusses the measurement of pitch floodlighting and glare condition in a stadium, taking...
Conference Paper
Full-text available
In this study, measurements of various domestic light-emitting diode (LED) lamps were conducted to investigate the effects of varying illuminance, correlated colour temperature (CCT), and colour rendering index (CRI) on visual perception; and to determine the users’ preference of those parameters under LED lamps in Indonesian context. The assessmen...
Article
Full-text available
The topic of discomfort glare is an important issue in daylit buildings; however, a consensus on the glare indices and their criteria is hard to achieve, since any measured objective values must show a significant correlation with perception of the space occupants. Applicability of the criteria for each glare indices is yet to be determined, consid...
Article
Full-text available
Ruang industri memiliki kebutuhan pencahayaan yang relatif tinggi dibandingkan dengan ruang kantor pada umumnya serta memerlukan jumlah luminer yang cukup banyak, sehingga perletakan luminer pada ruang tersebut perlu didesain secara optimum. Dalam studi ini metode optimisasi menggunakan algoritma genetik (GA) diterapkan untuk mengoptimisasi perleta...
Article
Full-text available
One way to reduce energy consumption in buildings is to use daylighting. However, daylight can cause visual discomfort in the form of glare. Center of Art, Design, and Language (CADL) Institut Teknologi Bandung is a building that has windows on west and east facades, so the probability of glare occurrence is high. In this research, CADL was optimiz...
Article
Full-text available
Standar Nasional Indonesia tentang pencahayaan alami pada bangunan gedung yang berlaku pada saat ini, SNI 03-2396-2001, merekomendasikan penggunaan faktor langit dari langit berawan seragam sebagai indikator ketersediaan pencahayaan alami dalam ruangan. Untuk menghitung faktor langit sebagai fungsi dari posisi relatif (L/D and H/D) dari suatu luban...
Technical Report
Full-text available
Humans gain many benefits from having daylight and view in buildings. Nevertheless, providing daylight and view in buildings should be done in an acceptable way, so that the energy savings potential can be optimally achieved. Artificial lighting control systems with daylight-sensing mechanism that do not consider visual comfort of the occupants, pa...
Article
Full-text available
The current Indonesian national standard on daylighting in buildings (SNI 03-2396-2001) proposes a number of criteria to design and evaluate daylighting condition in indoor spaces, where some of the criteria are unique to other national standards. To assess whether there is correlation between the standard and the subjective perception of the build...
Article
Full-text available
Design optimisation problems of window size and façade orientation in buildings have been investigated many times, with regard to energy and comfort criteria. To indicate daylight availability in indoor spaces, a number of daylight metrics have been proposed, but those metrics are not always fully accounted in the optimisation process. Also, most s...