An Empirical Study on Time Lag Phenomenon Regarding Summertime Indoor Thermal Environments in the Domestic Buildings of Different Construction Types in Hot-Humid Climate Zone

2014 ◽  
Vol 911 ◽  
pp. 504-508 ◽  
Author(s):  
Hung Ren Hsieh ◽  
Wun Yuan Chen ◽  
Hsin Yu
Keyword(s):  
Natural Ventilation ◽  
Thermal Environment ◽  
Time Lag ◽  
Humid Climate ◽  
Indoor Temperature ◽  
Thermal Environments ◽  
Temperature And Humidity ◽  
Humidity Measurements ◽  
Detached House ◽  
Heavy Construction

In the empirical case studies of the seven detached house buildings situated in Yilan, Taiwan in a hot and humid climate, this research conducted the actual measurements and analysis of the Summertime Indoor and Outdoor thermal environment parameters in order to accomplish the research of Time Lag Phenomenon of Summertime Indoor Temperature and Humidity in the Buildings of Light (Composite) Constructions and Heavy (Reinforced Concrete) Constructions. Firstly, it indicated that given the condition of doors and windows in closed positions, there would be Time Lag Phenomenon for both of the indoor Temperature and Humidity measurements in domestic buildings. The Temperature Time Lag for Heavy Construction Buildings had a duration of around three hours, almost as twice that of the figure for Light Construction Buildings. There was a significant correlation between Quantity of Interior Finishes and Humidity Time Lag inside domestic buildings, whereas the bigger the Quantity of Interior Finishes, the longer the Humidity Time Lag. Secondly, it also showed that given the condition of doors and windows in opened positions, there was almost zero Time Lag for both of the domestic indoor Temperature and Humidity measurements. Last but not least, generally speaking, the Ratio of Indoor/Outdoor Diurnal Temperature Range of Light Construction Buildings were higher than that of Heavy Construction Buildings. In particular, given the condition of doors and windows in opened positions with natural ventilation in summertime, it was slightly cooler inside the Light Construction Domestic Buildings than the Heavy Construction Domestic Buildings.

Study on Thermal Environment of Traditional Architecture in Tropic Climate

2011 ◽  
Vol 243-249 ◽  
pp. 6857-6861 ◽  
Author(s):  
Li Juan Wang ◽  
Jia Ping Liu ◽  
Yan Feng Liu ◽  
Ying Ying Wang ◽  
Jing Chen
Keyword(s):  
Heat Stress ◽  
Wind Speed ◽  
Metabolic Rate ◽  
Natural Ventilation ◽  
Thermal Environment ◽  
Outdoor Environment ◽  
Stress Index ◽  
Traditional Architecture ◽  
Thermal Environments ◽  
Heat Stress Index

Haikou is located in tropic climates in China. The outdoor environment in summer is too harsh to stay here. However, the traditional architecture, namely arcade, still survives in the severe climate. Its indoor and outdoor parameters of arcade are tested in field to research its thermal environments. The heat stress index is used to study the adaptability mechanism of arcade and local human to hot and humid environment. It proves that the metabolic rate and wind velocity are main and adjustable factors to reduce heat stress in such wretched weather. On the condition of metabolic rate below 60met and wind speed above 0.7m/s, the healthy adult can work normally in the arcade or on the corridor. So the human in tropic area should keep their metabolic rate and period staying out in the summer daytime as less as possible, and the architects should make full use of the local wind speed to organize natural ventilation.

Long-term investigation of moisture environment in underground civil air defence work

2016 ◽  
Vol 26 (6) ◽  
pp. 744-757 ◽  
Author(s):  
Huibo Zhang ◽  
Jing Liu ◽  
Chunan Li ◽  
Zhiwei Lian
Keyword(s):  
Formation Mechanism ◽  
Natural Ventilation ◽  
Thermal Environment ◽  
Mould Growth ◽  
Indoor Temperature ◽  
Good Level ◽  
Surface Condensation ◽  
Long Term Measurement ◽  
Humidity Environment

Moisture becomes problematic in underground civil air defence work because of heavy rusting of protection equipment, mould and construction deterioration. This study conducted long-term measurement of the heat and humidity environment in a residential and a non-residential underground civil air defence work in Beijing. The thermal environment was very stable at a good level except in some summer days in the non-residential civil air defence work because of moisture insulation in summer and straw board interior wall furnishing, whereas it was very severe and varied with changing outdoor conditions in the residential civil air defence work. The humidity environment in the residential civil air defence work was wet or very wet (RH > 80%) for over 20% of the year, which may cause mould growth and surface condensation, because of low indoor temperature in winter and occupant activities and natural ventilation in summer. The findings of this study may prove important in elucidating the formation mechanism of thermal environment in civil air defence work and to develop appropriate desiccant solutions.

Optimal Design of the External Respiration Double Skin Facade

2011 ◽  
Vol 374-377 ◽  
pp. 257-262
Author(s):  
Shi Feng ◽  
Wang Wei
Keyword(s):  
Optimal Design ◽  
Natural Ventilation ◽  
Thermal Environment ◽  
External Respiration ◽  
Indoor Temperature ◽  
Temperature Changes ◽  
Indoor Thermal Environment ◽  
Double Skin ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Method

An optimal design is taken on the external respiration double skin facade (DSF) of a office building in Wuhan. The indoor thermal environment of the office units in the building have been simulated by taken computational fluid dynamics (CFD) method, and then the paper analyzes the indoor temperature changes under the condition that the internal airflow status of the DSF for natural ventilation, without shade, vents closed and other cases, discusses the influences of different inner glazed skin’s thermal properties, DSF for active ventilation and different wind speed on indoor thermal environment, according to the simulation results we obtain parameters of relevant optimal design.

scholarly journals Investigation of Indoor Thermal Environments in a Two-Story Corner Terrace House in Malaysia

2019 ◽  
Author(s):  
Ng Wai Tuck ◽  
Sheikh Ahmad Zaki ◽  
Aya Hagishima ◽  
Hom Bahadur Rijal ◽  
Mohd Azuan Zakaria ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Natural Ventilation ◽  
Thermal Environment ◽  
Assisted Ventilation ◽  
International Standards ◽  
Actual Condition ◽  
Air Conditioner ◽  
Humid Climate ◽  
Ground Floor ◽  
Hot Humid Climate

An effective passive cooling strategy is essential for reducing energy consumption in a residential building without ignoring thermal comfort. Therefore, a field measurement on the thermal performance of a corner terrace house in Kuala Lumpur was conducted to reveal the effectiveness of free running (FR) with four different approaches – no ventilation, full ventilation, day ventilation, and night ventilation. The measurement was done for all bedrooms and family area on the first floor. Also, mixed mode (MM) consisting of natural ventilation, mechanical ventilation with ceiling fan, and cooling with an air-conditioner that represents the actual condition of this house was also measured at living and dining area on the ground floor for comparison. The results reveal that FR from all approaches recorded a mean indoor air temperature of approximately 31 ∘C. The actual thermal condition of the house with MM on the ground floor was recorded at 30 ∘C, 1 ∘C lower than FR approach on the first floor. When compared with relevant international standards on predicting indoor comfort temperature based on outdoor temperature, FR was approximately 5 ∘C higher than predicted temperature based on American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard 55 (2017), 3.4 ∘C higher than European Standard EN15251 and 1.5 ∘C higher than adaptive thermal comfort equation (ACE) for hot-humid climate. In comparison, MM performed better and was closer to relevant international standards, especially ACE for the hot-humid climate. As a conclusion, FR is not suitable for a hot-humid climate such as Malaysia to achieve a comfortable indoor thermal environment without any assisted ventilation use in MM.

scholarly journals Determinación de horarios de aberturas en una vivienda de construcción masiva para su corrección térmica interior

2019 ◽  
pp. 1-10
Author(s):  
Arlees Ysrael Diaz-Salazar ◽  
Jorge Armando Ojeda-Sanchez ◽  
Gonzalo Bojórquez-Morales
Keyword(s):  
Thermal Performance ◽  
Thermal Environment ◽  
Humid Climate ◽  
Thermal Discomfort ◽  
Air Conditioners ◽  
Climatic Environment ◽  
The Hours ◽  
Humidity Measurements ◽  
Construction Model ◽  
Short Time

Currently the choice of massive construction models is the alternative with greater recurrence to acquire a house in warm humid climate in Mexico, however, much of this is not adapted to its climatic environment and causes thermal discomfort in the user because of the internal environment generated as response of the characteristics of its architectural envelope. To correct in a short time the effect of thermal discomfort, the user usually employs mechanized climatizations solutions such as fans or air conditioners. It was proposed the use of schedule for opening hours in the architectural envelope in a warm humid climate, mainly in windows, as a strategy to correct the internal thermal environment, considering its advantages as the immediate application and easy implementation, in contrast to some architectural or physical modification of the envelope. Dry bulb temperature and relative humidity measurements were made in a massive construction model to determine its thermal performance in the hottest month of the year. Subsequently, simulations were made with EnergyPlus to determine suitable opening times to correct the thermal environment by prolonging the hours of interior comfort when compared with the original interior thermal performance of the envelope.

scholarly journals 3D computational fluid dynamics modeling of temperature and humidity in a humidified greenhouse

2021 ◽  
Vol 13 (1) ◽  
pp. 17-31
Author(s):  
Cuauhtémoc Pérez-Vega ◽  
◽  
José Armando Ramírez-Arias ◽  
Irineo L. López-Cruz ◽  
Ramón Arteaga-Ramírez ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Natural Ventilation ◽  
Temporal Distribution ◽  
Cfd Modeling ◽  
Cfd Model ◽  
Dynamics Modeling ◽  
Temperature And Humidity ◽  
Humidity Measurements ◽  
Computational Fluid Dynamics Cfd

Introduction: Medium and low technology greenhouses use natural ventilation as a method of temperature and humidity control. However, at certain times of the year, this is insufficient to extract excess heat inside the greenhouse, so devices such as hydrophanes (humidifiers) have been implemented to reduce the temperature. It is necessary to know the behavior of temperature and humidity, since both factors influence the development of crops and, therefore, their yield. Objective: To develop a computational fluid dynamics (CFD) model of a naturally ventilated zenithal greenhouse equipped with hydrophanes to understand the spatial and temporal distribution of temperature and humidity inside the greenhouse. Methodology: The experiment was carried out in a greenhouse equipped with hydrophanes and grown with bell pepper. Temperature and humidity measurements were performed from March 7 to 25, 2014. The ANSYS Workbench program was used for the 3D CFD modeling. Results: The CFD model satisfactorily described the temperature and humidity distribution of the greenhouse, with an error of 0.11 to 3.43 °C for temperature, and 0.44 to 10.80 % for humidity. Limitations of the study: Numerical modeling using CFD is inadequate to model the temporality of the variables. Originality: There are few studies that model humidity behavior with CFD and the use of hydrophanes in Mexico. Conclusions: The CFD model allowed visualizing the distribution of temperature and air humidity inside the greenhouse.

scholarly journals Research on the Indoor Thermal Environment of Attached Sunspace Passive Solar Heating System Based on Zero-State Response Control Strategy

2022 ◽  
Vol 12 (2) ◽  
pp. 855
Author(s):  
Jing Zhao ◽  
Dehan Liu ◽  
Shilei Lu
Keyword(s):  
Control Strategy ◽  
Natural Ventilation ◽  
Thermal Environment ◽  
Northern China ◽  
Solar Heating ◽  
Heating Season ◽  
Cold Region ◽  
Indoor Temperature ◽  
Response Control ◽  
State Response

The application of attached sunspace passive solar heating systems (ASPSHS) for farmhouses can improve building performance, reduce heating energy consumption and carbon dioxide emissions. In order to take better use of the attached sunspace to prevent heat transfer or promote natural ventilation, this paper presented a zero-state response control strategy for the opening and closing time of active interior window in the ASPSHS. In order to verify the application of this strategy, an attached sunspace was built in an actual farmhouse. A natural ventilation heat exchange model was built based on the farmhouse with attached sunspace. The proposed zero-state response control strategy was implemented in TRNSYS software. Field measurement in living lab was carried out to inspect the distribution of the thermal environment in the farmhouse with attached sunspace under a zero-state response control strategy in the cold region of northern China. The experimental results show that, even under −5.0–2.5 °C ambient temperature, the application of zero-state response control strategy effectively increases the internal temperature to an average of 25.45 °C higher than the outside, with 23% indoor discernible temperature differential in the sample daytime. The whole-season heating performance was evaluated by simulating the model for the heating season in 2020–2021. The simulation demonstrates that the ASPSHS under zero-state response control strategy can maintain a basic indoor temperature of 14 °C for 1094 h during the heating season, with a daytime heating guarantee rate of 73.33%, thus ensuring higher indoor heating comfort during the day. When compared to a farmhouse with an attached sunspace under the zero-state response control strategy, the energy savings rate can be enhanced by 20.88%, and carbon emissions can be reduced by 51.73%. Overall, the attached sunspace with the zero-state response control strategy can effectively increase the indoor temperature when the solar radiation is intensive and create a suitable thermal environment for the farmhouse in the cold region of northern China.

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