scholarly journals Perumusan Persepsi Kenyamanan Termis Pejalan Kaki di Iklim Tropis Lembab dan Membandingkan dengan Rumus untuk Iklim lainnya

2012 ◽  
Vol 26 (2) ◽  
pp. 146 ◽  
Author(s):  
S Sangkertadi ◽  
Reny Syafriny
Keyword(s):  
Thermal Comfort ◽  
Land Surface ◽  
Field Studies ◽  
Climatic Conditions ◽  
Regression Equation ◽  
Outdoor Thermal Comfort ◽  
Regression Equations ◽  
Humid Climate ◽  
Wide Range ◽  
Radiation Measurements

This article is about development a regression equation to determine the perception of thermal comfort for pedestrians in the humid tropical climate. Methods used was field studies and questionnaires to 60 samples as respondents in Manado. Each of the respondents was asked to act as pedestrian but walked on a treadmill for 2 minutes 5 five times. They regrouped into two parts, one who walked under open-sky and another group was under the shade of trees. Measurements of climate variables include air temperature, air humidity, radiation temperature, land surface temperature and solar radiation. Measurements to the respondents were their height, weight and skin temperature. By using statistical approach it is obtained a regression equation "Y=- 6.1369 + 0.479 Adu + 0.1143 Ta + 0.0376 Trm + 0.2541 RH + 1.6793 clo". The equation was then validated by comparison with other equations of non-tropical humid climate case. It is found that the empirical regression equations of outdoor thermal comfort developed by means of field studies in a certain climatic conditions could not be applied for a wide range of climate.

scholarly journals Amelioration of Urban Temperature through Landscape Design Approaching Hot-Humid Climate: A Review

2018 ◽  
Vol 3 (8) ◽  
pp. 1-11
Author(s):  
Sharifah Khalizah Syed Othman Thani ◽  
Nik Hanita Nik Mohamad ◽  
Sabrina Idilfitri
Keyword(s):  
Thermal Comfort ◽  
Publishing House ◽  
Landscape Design ◽  
Design Approach ◽  
Outdoor Thermal Comfort ◽  
Humid Climate ◽  
Policy Makers ◽  
International Publishing ◽  
Hot Humid Climate ◽  
Sustainable Landscape

This paper discusses a conceptual review of sustainable landscape design approach as mitigating strategies to modify urban temperature in a hot- humid climate.The amelioration of urban temperature through landscape approach can be achieved by incorporating sustainable landscape design practices via the interplay of natural vegetation in the hot-humid tropics. The findings of this paper are hoped to guide the practitioners in landscape architecture, policy makers and urban designers to incorporate sustainable landscape design approach towards improving outdoor thermal comfort; thus providing a better quality of life. Keywords: Landscape design principles; outdoor thermal comfort; urban heat island; hot-humid climate eISSN 2514-751X © 2018. The Authors. Published for AMER ABRA cE-Bs by e-International Publishing House, Ltd., UK. This is an open-access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia. https://doi.org/10.21834/aje-bs.v3i8.274 

scholarly journals PAIR INFLUENCE OF WIND SPEED AND MEAN RADIANT TEMPERATURE ON OUTDOOR THERMAL COMFORT OF HUMID TROPICAL ENVIRONMENT

2017 ◽  
Vol 10 (2) ◽  
pp. 177-185 ◽  
Author(s):  
Sangkertadi Sangkertadi ◽  
Reny Syafriny
Keyword(s):  
Wind Speed ◽  
Thermal Comfort ◽  
Significant Role ◽  
Tropical Environment ◽  
Outdoor Thermal Comfort ◽  
Regression Equations ◽  
Mean Radiant Temperature ◽  
Walking Activity ◽  
Globe Temperature ◽  
Radiant Temperature

The purposes of this article is to explore knowledge of outdoor thermal comfort in humid tropical environment for urban activities especially for people in walking activity, and those who stationary/seated with moderate action. It will be characterized the pair influence of wind speed and radiant temperature on the outdoor thermal comfort. Many of researchers stated that those two microclimate variables give significant role on outdoor thermal comfort in tropical humid area. Outdoor Tropical Comfort (OTC) model was used for simulation in this study. The model output is comfort scale that refers on ASHRAE definition. The model consists of two regression equations with variables of air temperature, globe temperature, wind speed, humidity and body posture, for two types of activity: walking and seated. From the results it can be stated that there is significant role of wind speed to reduce mean radiant temperature and globe temperature, when the velocity is elevated from 0.5 m/s to 2 m/s. However, the wind has not play significant role when the speed is changed from 2 m/s to 3.5 m/s. The results of the study may inspire us to implement effectiveness of electrical-fan equipment for outdoor space in order to get optimum wind speed, coupled with optimum design of shading devices to minimize radiant temperature for thermal comfort.

scholarly journals Parametric Modelling and Traditional Architecture: Improving the thermal comfort of the traditional courtyard house in Morocco

2018 ◽  
Vol 149 ◽  
pp. 02051 ◽  
Author(s):  
Khalid El Harrouni ◽  
Mouhcine Ben Aicha ◽  
Rime El Harrouni
Keyword(s):  
Thermal Comfort ◽  
Simulation Modelling ◽  
Climatic Conditions ◽  
Parametric Modelling ◽  
Design Strategies ◽  
Indoor Climate ◽  
Humid Climate ◽  
Improve Design ◽  
Courtyard House

The traditional courtyard house of the Mediterranean Basin has been viewed as a complex regulating system that creates a microclimate which historically worked, and still works, in a passive way to provide acceptable thermal comfort in summer. The internal courtyard is generally described as a positive factor that can moderate extreme outdoor climatic conditions. However, some researches have shown that the courtyard could become a negative factor from the energy efficiency point of view. For this purpose, this paper is based on a research study exploring sustainable characteristics of Moroccan traditional housing and its climatic adaptation, delving into the Rabat-Salé case study. A traditional courtyard model is used as a case study to analyze the indoor thermal comfort without using mechanical heating and cooling systems. The thermal behavior of the rooms surrounding the courtyard is analyzed under a temperate and humid climate of Rabat-Salé medina. The simulation modelling is carried out to analyze the effectiveness of different parameters to improve the indoor climate during summer and winter, including the façade orientation, the air infiltration, the surroundings, the ceiling height, the walls and roof/ceiling insulation and the shading devices. Tools for climatic design, Mahoney’s tables, Givoni and Szokolay bio climatic diagrams have been also used to improve design strategies in terms of thermal comfort.

scholarly journals Building Configuration of Low-Cost Apartments in Bandung—Its Contribution to the Microclimate and Outdoor Thermal Comfort

Buildings ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 123 ◽  
Author(s):  
Beta Paramita ◽  
Hiroatsu Fukuda ◽  
Rendy Perdana Khidmat ◽  
Andreas Matzarakis
Keyword(s):  
Thermal Comfort ◽  
Open Space ◽  
Low Cost ◽  
Human Perception ◽  
Ground Cover ◽  
Outdoor Thermal Comfort ◽  
Humid Climate ◽  
Hot Humid Climate ◽  
Radiant Temperature ◽  
Building Form

This paper aims to find the microclimate aspect within the building form and configuration of five low-cost apartments (henceforth rusun) in Bandung, Indonesia. There are parallel, square, and interspersed plots investigated with specific discussion on the microclimate aspects that gain human perception of outdoor thermal comfort. The microclimate prognostic model, i.e., ENVI-met, was used to determine the mean radiant temperature (Tmrt), which was then used to describe the living quality of outdoor thermal comfort, i.e., PET (physiologically equivalent temperature) in a hot-humid climate context. A parallel plot with building orientation toward north-south was found as the most beneficial building form and configuration. Somehow, the parallel plot toward the west-east orientation did not provide similar performance. Nevertheless, the square plot provided uncomfortable perception as there was an absence of building shade within the wide open space and ground cover to absorb the insolation. The interspersed plot can be considered for the building configuration because it generates more wind among other plots. The building form and configuration of rusun with passive design seems to not be able to achieve outdoor thermal comfort. The highest PET value of Model D with the square plot had PET = 41 °C (hot) while the lowest PET in Model A with the parallel plot (N-S) had PET = 34.2 °C (slightly warm).

scholarly journals Correlative Impact of Shading Strategies and Configurations Design on Pedestrian-Level Thermal Comfort in Traditional Shophouse Neighbourhoods, Southern China

2019 ◽  
Vol 11 (5) ◽  
pp. 1355 ◽  
Author(s):  
Shi Yin ◽  
Werner Lang ◽  
Yiqiang Xiao ◽  
Zhao Xu
Keyword(s):  
Thermal Stress ◽  
Thermal Comfort ◽  
Southern China ◽  
Simulation Models ◽  
Outdoor Thermal Comfort ◽  
Humid Climate ◽  
Physiological Equivalent Temperature ◽  
Axis Orientation ◽  
Covered Area ◽  
The Impact

Traditional shophouse neighbourhoods (TSNs) in southern China respond well to the local hot and humid climate through proper street configurations and the integration of different shading strategies. Investigating the impact of shading strategies and configurations in TSNs on outdoor thermal comfort is valuable for guiding current urban design. Three street canyons in a TSN of Guangzhou with different shading strategies were selected as basic cases for microclimatic measurement in the summer season, i.e., alleys, streets with arcade for pedestrians, and streets with high-density greenery. After validating their simulation models in ENVI-met, five groups of parametric simulations were generated by varying the canyon aspect ratio (CHW), the canyon axis orientation, arcade proportion (AHW), and the tree-covered area (TCA). Using the physiological equivalent temperature (PET) to assess the above results, the correlative impact of different variations on pedestrian’s thermal comfort and their corresponding favourable ranges are summarized. The findings suggest that: (a) only in alleys and arcade streets, the pedestrian-level thermal comfort was significantly influenced by canyon axis orientation. (b) The thermal stress for pedestrians increased dramatically when the CHW was lower than 1.5 in alleys and 0.78 in boulevards (in TCA = 89%), while the CHW higher than 1 indicated a remarkable reduction on the PET for pedestrians in arcades. (c) The pedestrians started losing the protection from shading strategy to thermal stress when the AHW was higher than 1.33 (in canyon with CHW = 1) or the TCA was lower than 33% (in canyon with CHW = 0.78).

Assessing the Impact of Vegetation in the Visibility Connection and Thermal Comfort in the Urban Outdoors (Case Study: Shafagh Park)

2021 ◽  
Author(s):  
Alireza Karimi ◽  
Darya Gachkar ◽  
Sadaf Gachkar ◽  
soheila aghlemand
Keyword(s):  
Thermal Comfort ◽  
Urban Parks ◽  
Climatic Conditions ◽  
Outdoor Thermal Comfort ◽  
Favorable Conditions ◽  
The Impact ◽  
The Relationship ◽  
Good Visibility

Abstract Regarding the significant impact of visibility, landscape, and thermal comfort on the presence of users’ attendance in urban parks, there is a severe interest in studies on the amount of visibility and the outdoor thermal comfort especially in a district with hot summers. this research, after investigating the shafagh park based on space laws and the relationship between park spaces with each other in terms of accessibility and visibility to achieve the effect of plants, then, based on the obtained data, the role of plants in evaluating thermal comfort conditions in the park space was investigated and finally, their relationship with each other has been examined. results have revealed that, plants have an undeniable role in improving the conditions of thermal comfort and visual visibility and user movement in spaces, so that, the best points in terms of thermal comfort, had a favorable view and perspective, while, areas of the park that did not have good visibility and landscape did not experience favorable conditions in terms of thermal comfort. Therefore, architects, landscape architects, and urban designers who research the problem of thermal comfort and landscape analysis in urban parks can use the findings of this article for effective outcomes, especially in parks with climatic conditions use similar in Tehran.

Environmental Variability Associated by Economic Thresholds for Soybeans

Weed Science ◽  
1991 ◽  
Vol 39 (4) ◽  
pp. 564-569 ◽  
Author(s):  
Troy A. Bauer ◽  
David A. Mortensen ◽  
Gaila Wicks ◽  
Thomas A. Hayden ◽  
Alex R. Martin
Keyword(s):  
Environmental Variability ◽  
Soybean Seed ◽  
Field Studies ◽  
Regression Equation ◽  
Significant Source ◽  
Yield Reduction ◽  
Crop Loss ◽  
Regression Equations ◽  
Weed Species ◽  
Weed Density

Field studies were conducted in 1986, 1987, 1988, and 1989 to determine the stability of crop loss functions across site by year environments. Environment was a significant source of variation for the soybean crop loss function as influenced by velvetleaf, but not as influenced by tall waterhemp and common sunflower. Weed density was a highly significant source of variation for all weed species studied. Regressions between percent soybean seed yield reductions and weed populations were linear. The velvetleaf interference regression equations were divided into two groups, those with high soybean-yielding intercepts and those with low-yielding intercepts, to explain the variance observed across environments. The regression equation for the high-yielding intercept group was Ŷ = 4.24X while the low-yielding group was Ŷ = 2.14X, where Y is percent soybean yield reduction and X is weed density per 10.7 m of soybean row. Tall waterhemp and common sunflower regression equations were determined to be Ŷ = 1.37X and Ŷ = 6.52X, respectively. Confidence intervals were used to account for the variance associated with the mean regression equation for each model and to develop economic threshold models that include risk aversion principles.

Sign in / Sign up

Export Citation Format

Share Document