scholarly journals Indoor environmental assessment method in residential kitchen

2020 ◽  
Vol 24 (3 Part B) ◽  
pp. 2055-2065
Author(s):  
Anita Vorosne-Leitner ◽  
Laszlo Kajtar ◽  
Jozsef Nyers
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Residential Buildings ◽  
Local Source ◽  
Radiant Heat Transfer ◽  
Main Role ◽  
Monitoring Method ◽  
Gas Stoves

Nowadays, energy consumption, environmental protection and safety are fundamental issues in design process. In order to reduce energy consumption, buildings become increasingly insulated and air tight. It has controversial effect on indoor environment, therefore, it has become essential to apply an effective ventilation system. This requires detailed design, especially if there is a strong, local source in the space. In residential buildings, gas stoves are significant source of gaseous pollutants and heat load. Indoor environmental assessments have been carried out in order to evaluate the key parameters. The aim of this studies is to develop a new design and monitoring method of residential kitchens with gas stoves. Primary results of laboratory researches indicate that the largest stovetop burner with power of 2.8 kW, has the main role. Significant emissions of NOx have been measured, in an average size kitchen (Vroom = 36 m3) the Hungarian standard NOx concentration level (200 ?g/m3) can be ensured with an exhaust air-flow of 1102 m3/h. With respect of thermal environmental parameters, heat loads of residential gas stoves could be characterized with convective heat transfer coefficient of 4.5 W/m2K and radiant heat transfer coefficient of 5.9 W/m2K. As regards thermal comfort parameters, predicted mean rate index in proved to be applicable in residential kitchens from ?0.3 to +2.0. However draught rating cannot be applied, with respect to the temperature limitations.

scholarly journals Research on Energy-Saving Design of Rural Building Wall in Qinba Mountains Based on Uniform Radiation Field

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Qin Zhao ◽  
Xiaona Fan ◽  
Qing Wang ◽  
Guochen Sang ◽  
Yiyun Zhu
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Energy Saving ◽  
Radiation Field ◽  
Thermal Environment ◽  
Residential Buildings ◽  
South Wall ◽  
Heating Energy Consumption

How to create a healthy and comfortable indoor environment without causing a substantial increase in energy consumption has become a strategic problem that the development of all countries must face and solve. According to the climatic conditions of Qinba Mountains in China, combined with the characteristics of local rural residential buildings and residents’ living habits, the field survey and theoretical analysis were used to study the thermal environment status and the heating energy consumption condition of local rural residential buildings. The thermal design method of walls for the local rural energy-saving buildings based on the indoor uniform radiation field was explored by using the outdoor comprehensive temperature function expressed by the fourth-order harmonic Fourier series as the boundary condition of the wall thermal analysis. ANSYS CFX was adopted to study the suitability of the energy-saving wall structure designed by the above method. The results show that the indoor thermal environment of local rural residential buildings in winter is not ideal and the heating energy consumption is high, but this area has the geographical advantage to develop solar energy buildings. It is proposed that the indoor thermal comfort temperature of local rural residential buildings in winter should not be lower than 14°C. When the internal surface temperature of the external walls in different orientations are equally based on the design principle of uniform radiation field, the heat transfer coefficient of the east wall, the west wall, and the north wall of the local rural residential buildings is 1.13 times, 1.06 times, and 1.14 times of the south wall heat transfer coefficient, respectively. The energy-saving structural wall with KPI porous brick as the main material and the south wall heat transfer coefficient of 0.9 W/(m2·K) is the most suitable energy-saving wall for local rural residential buildings.

scholarly journals The effect of different types of window for residential building based on intermittent heating supply

2019 ◽  
Vol 136 ◽  
pp. 03020
Author(s):  
Chenyang Tao ◽  
Nan Li ◽  
Yuchen Wang
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Residential Buildings ◽  
Recovery Period ◽  
Residential Building ◽  
Thermal Design ◽  
Intermittent Heating ◽  
Different Types

Aiming to lessen energy consumption and heating cost, this paper analyzes the effect of different types of window for residential building based on intermittent heating supply. The research results show that the type of window with a smaller heat transfer coefficient has higher energy consumption. Otherwise, the rate of temperature rising is slightly affected by the change of window with different heat transfer coefficient and window-to-wall ratio. Based on the economic and technical analysis, through changing the better window, energy-saving ratio can be arrived to 10.4%-16.8% and economic recovery period is 4.4-10.4 years. The research findings can be used for reference to thermal design in new residential buildings and provide improvement of building performance for existing residential buildings.

Determination of the Effect of Wall Heating Systems on Convective Heat Transfer Coefficient in Buildings

2014 ◽  
Vol 875-877 ◽  
pp. 1630-1636 ◽  
Author(s):  
Ozgen Acikgoz ◽  
Olcay Kincay ◽  
Zafer Utlu
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Thermal Comfort ◽  
Transfer Coefficient ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Convective Heat Transfer Coefficient ◽  
Heated Wall ◽  
Real Size

Decreasing energy consumption and advancing thermal comfort are the most important aims of building engineering. Previously reported studies by many researchers have found that different usages of convective heat transfer coefficient (CHTC) correlations in heating system simulations have considerable impacts on calculated heating load in buildings. Hence, correct utilization of CHTCs in real size room enclosures has great importance for both energy consumption and thermal comfort. In this study, a modeled room was numerically heated from one vertical wall and cooled from the opposite wall in order to create a real room simulation. While cooled wall simulate heat losses of the room, heated wall simulates the heat source of enclosure. Effects of heated and cooled wall temperatures and characteristic length on CHTC and Nusselt number in the enclosure were numerically investigated for two (2-D) and three dimensional (3-D) modeling states. CHTCs and Nusselt numbers of a real size room with the dimensions of 6.00 by 2.85 by 6.00 were found with FLUENT CFD and graphics of change were drawn. As result, difference between 2-D and 3-D solutions was found approximately 10%. This was attributed as the effect of air flow pattern effects over other surfaces in the enclosure that can not be counted at 2-D solutions. The change of CHTC at different characteristic lengths was illustrated as well.

Numerical Simulation of a Canadian Well With Several Circumferential Rows of Internal Vortex Generators

2021 ◽  
Author(s):  
Nabil Kharoua ◽  
Hamza Semmari ◽  
Houssem Korichi ◽  
Mehdi Haroun
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Residential Buildings ◽  
Vortex Generators ◽  
Ambient Conditions ◽  
Operational Conditions ◽  
Positive Effects ◽  
The Heat Transfer Coefficient

Abstract Canadian Wells exploit the quasi-stable underground temperature throughout the year for cooling and heating applications. This type of heat exchangers is used in residential buildings, agriculture and industry. Implementing Vortex Generators (VGs) is intended to disturb the thermal and dynamic boundary layers developing in the near-wall regions leading to the increase of the heat transfer coefficient. The present work investigates the positive effects of a sequence of several rows of VGs. The commercial code ANSYS FLUENT was used to perform numerical simulations mimicking the variation of the seasonal operational conditions occurring within one year. The ambient conditions were considered for the city of Constantine located in the east of Algeria at an altitude of 600m over the sea level. Sinusoidal functions of time and depth, were used for the yearly variations of the ground and air temperatures. Parallelepiped VGs were considered in this study. The Reynolds number was in the range Re = 14975–42789. The results illustrated a contrasting effect of the Reynolds number on the heat transfer coefficient and the temperature difference between the inlet and outlet of the Canadian Well. In terms of number of VGs rows, the beneficial heat transfer effects were observed till the fifth row only.

Performance Experimental Study and Energy Consumption Calculation of Hollow Glass Window Film

2011 ◽  
Vol 250-253 ◽  
pp. 356-359
Author(s):  
Dan Ping Yang ◽  
Jia Peng He ◽  
Zheng Song Zhang
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Window Glass ◽  
Hollow Glass ◽  
Window Film ◽  
The Heat Transfer Coefficient ◽  
Energy Consumption Calculation

This paper taked hollow glass window as the model, and heat transfer coefficient, sunshading coefficient and energy consumption of the window glass were obtained in the situations of window glass with and without low-E film by doing experiment and theoretical calculation. The results show that both heat transfer coefficient and sunshading coefficient decrease comparing the hollow glass window film with no film. For the fixed and push-pull window of the whole window, the heat transfer coefficient decrease by 24.2% and 28.9% respectively and sunshade coefficient decreases by 31.37%. And the low-E film by this study adopting reduces energy consumption of the summer greatly by 32.96%, and has no too large effect on winter heating, so the annual energy consumption reduces and the window film saves annual energy consumption 14.62% .

Design of an Automatic Cleaning Energy-Saving Technology for Manganese Sulfate Continuous Production Crystallizer

2013 ◽  
Vol 331 ◽  
pp. 52-56
Author(s):  
Tian Xiang Yu ◽  
Wen Yuan Zhou ◽  
Tian Lan Yu ◽  
De Qi Peng ◽  
Lei Ye
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Flow Velocity ◽  
Continuous Production ◽  
High Energy ◽  
Manganese Sulfate ◽  
Sulfate Production ◽  
Single Effect

To deal with the high energy consumption of the batch-type single-effect evaporator for Manganese sulfate production, a vibrating-spiral fluidized automatic cleaning technology was developed for continuous crystallizer production. The proposed method is presented followed by validation through a heat transfer coefficient comparison experiment. The result has shown that the proposed method has strong capability of automatic cleaning of crystalline scale. When the flow velocity in tubes is 0.80 m/s and the heat transfer temperature difference is 17°C, the overall heat transfer coefficient can reach 90% of that of clean tubes without spiral-fluidization. Furthermore, it is ideal to keep the volumetric concentration of fluidization particles at 1% and the automatic cleaning capability is almost directly proportional to the flow velocity. The automatic-cleaning continuous-production crystallizer technology can effectively replace the atmospheric-pressure single-effect evaporator and reduce the energy consumption by 95%. Comparing to the three-effect evaporator, the proposed method can save energy up to 88%.

Energy Consumption Analysis of Building with Typical External Thermal Insulation System

2017 ◽  
Vol 898 ◽  
pp. 1970-1977
Author(s):  
Yao Li ◽  
Xian Zheng Gong ◽  
Qing Hua Zhang ◽  
Chong Qi Shi
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Life Cycle ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Thermal Insulation ◽  
Insulation System ◽  
Insulation Thickness ◽  
Building Operation ◽  
Whole Life Cycle

External wall thermal insulation system protects the major structure of building effectively. In this study, a student dormitory building with typical external wall thermal insulation system in Beijing was chosen as the research object and the energy consumption analysis was conducted to identify the optimal external thermal insulation system during the whole life cycle. The results show: for brick-concrete buildings, the consumption of clay brick, reinforced concrete and cement mortar account for more than 95% of the total materials consumption, where reinforced concrete contributes most to energy consumption. The external insulation system with similar heat transfer coefficient but consist of different insulation materials mainly affects energy consumption in materials production phase (the difference of building production energy consumption is about 7.2%), while has no significant effect in building operation phase and whole life cycle. With the increase of heat transfer coefficient, the energy consumption decreases in materials production phase, accounting for 16.3%-21.9% of the life cycle energy consumption, increases in building operation phase, accounting for 78.1%-83.7%, and can be neglected in the disposal phase. And there exists an optimization value in building whole life cycle, at which the minimum value of the energy consumption reaches, when the heat transfer coefficient is 0.3W / (m2 • K), equivalent to 127mm EPS insulation thickness or 151mm rock wool insulation thickness.

scholarly journals Optimization method for prefabricated restroom envelope energy saving characteristics in hot summer and cold winter zone

2021 ◽  
pp. 014459872199393
Author(s):  
Lirui Zhang ◽  
Hong Zhang ◽  
Xu Xu ◽  
Ling Dong
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Thermal Characteristics ◽  
Optimization Method ◽  
Building Energy ◽  
Building Envelope ◽  
Cold Winter ◽  
Energy Consuming

In order to reduce the restroom envelope energy consumption, one optimization method on basis of analyzing the influence of heat transfer coefficient on the performance of a prefabricated restroom envelope in a hot summer and cold winter zone was proposed. An energy-consuming model of prefabricated restroom in Nanjing is initially built based on Designer's Simulation Toolkit software. Subsequently, the effect of external walls, rooftops, external windows with various thermal characteristics on the building envelope is analyzed respectively. Simultaneously, a method that only changes the heat transfer coefficient of the prefabricated restroom envelope while keeping other parameters unchanged is adopted. Results show that, for a prefabricated restroom, the optimal range of heat transfer coefficient of the external wall, rooftop, and external window in hot summer and cold winter zone is 0.199∼0.22, 0.16∼0.19, and 3.0∼3.1 W/(m2·K), respectively. When the window-to-wall ratio is less than 0.2, the priority of the wall heat transfer coefficient on building energy consumption is higher than that of the rooftop heat transfer coefficient, simultaneously, the rooftop heat transfer coefficient has priority higher than window heat transfer coefficient. Thus, it is of great significance to optimize the design of the prefabricated restroom envelope in a hot summer and cold winter zone, which provides relative reference for thermal performance improvement of prefabricated restrooms.

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