Analysis of Indoor Thermal Environment and Energy Consumption in Office Building Controlled by PMV

In the Yangtze River zone of China, the heating operation in buildings is mainly part-time and part-space, which could affect the indoor thermal comfort while making the thermal process of building envelope different. This paper proposed to integrate phase change material (PCM) to building walls to increase the indoor thermal comfort and attenuate the temperature fluctuations during intermittent heating. The aim of this study is to investigate the influence of this kind of composite phase change wall (composite-PCW) on the indoor thermal environment and energy consumption of intermittent heating, and further develop an optimization strategy of intermittent heating operation by using EnergyPlus simulation. Results show that the indoor air temperature of the building with the composite-PCW was 2–3°C higher than the building with the reference wall (normal foamed concrete wall) during the heating-off process. Moreover, the indoor air temperature was higher than 18°C and the mean radiation temperature was above 20°C in the first 1 h after stopping heating. Under the optimized operation condition of turning off the heating device 1 h in advance, the heat release process of the composite-PCW to the indoor environment could maintain the indoor thermal environment within the comfortable range effectively. The composite-PCW could decrease 4.74% of the yearly heating energy consumption compared with the reference wall. The optimization described can provide useful information and guidance for the energy saving of intermittently heated buildings.

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CASE STUDY ON INDOOR THERMAL ENVIRONMENT DURING WINTER AND ENERGY CONSUMPTION OF APARTMENT HOUSES IN COLD CLIMATIC REGION

AIJ Journal of Technology and Design ◽

10.3130/aijt.16.1015 ◽

2010 ◽

Vol 16 (34) ◽

pp. 1015-1018

Author(s):

Kahori GENJO ◽

Shin-ichi MATSUMOTO ◽

Ken-ichi HASEGAWA

Keyword(s):

Energy Consumption ◽

Thermal Environment ◽

Climatic Region ◽

Indoor Thermal Environment

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Indoor environmental quality and energy use evaluation of a three-star green office building in China with field study

Journal of Building Physics ◽

10.1177/1744259120944604 ◽

2020 ◽

pp. 174425912094460

Author(s):

Yan Zhou ◽

Jianmin Cai ◽

Yiwen Xu

Keyword(s):

Energy Consumption ◽

Relative Humidity ◽

Energy Use ◽

Thermal Environment ◽

Comfort Level ◽

Office Building ◽

Visual Environment ◽

Actual Performance ◽

Comparison Results ◽

Chinese Standard

In order to get more comprehensive operation performance on indoor environment quality (IEQ) and energy consumption, a long-time measurement and a field occupants’ satisfaction survey on IEQ performance of the first three-star-operation-certified green office building in Ningbo city of China have been conducted, and environmental energy efficiency (EEE) also has been analyzed. Moreover, IEQ and energy consumption of the green case office building are compared with other green office example buildings of the same climate zone in other literatures. The results show that the actual indoor thermal environment of the green case office building isn’t quite achieving the design goals with the Chinese standard of thermal comfort level II (GB 50736). Although indoor air quality of CO2 concentration and visual environment are consistent with the design goals, the indoor relative humidity doesn’t reach the design goal in most of the year. The questionnaire survey results illustrate that the green case building has a high occupants’ satisfaction on IEQ. The comparison results show that there is no obvious difference in indoor temperature and visual environment between the green case building and the green office example buildings in other studies. The results of occupant’s satisfaction and CO2 concentration of the green case building are better than in other studies. However, the indoor relative humidity of the green case building in every season is much higher than in other researches. Energy use intensity (EUI) of the green case building is about 56.5 kWh/m2·a, which is much lower than the constraint value of the Chinese standard. The actual performance of the green case building is also evaluated by the indicator of EEE. The results of this article can provide useful reference for green building operational performance promotion and feedback for design phase optimization.

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Research on Annual Thermal Environment of Non-Hvac Building Regulated by Window-to-Wall Ratio in a Chinese City (Chenzhou)

Sustainability ◽

10.3390/su12166637 ◽

2020 ◽

Vol 12 (16) ◽

pp. 6637

Author(s):

Jiayu Li ◽

Bohong Zheng ◽

Xiao Chen ◽

Yihua Zhou ◽

Jifa Rao ◽

...

Keyword(s):

Energy Consumption ◽

Building Material ◽

Thermal Environment ◽

Meteorological Data ◽

Meteorological Station ◽

Analytical Tool ◽

Thermal Perception ◽

Material Parameters ◽

Indoor Thermal Environment ◽

Chinese City

As the window-to-wall ratio, a microclimatic factor in residential districts, regulates the indoor thermal environment and implicates the energy consumption, this research was aimed at interpreting the microclimate effects of the window-to-wall ratio on the indoor thermal environment of the non-Hvac building located in the block from the view of a full year. Urban built parameters and building material parameters applied in Chenzhou were investigated, with the ENVI-met model serving as the analytical tool calculating the meteorological data recorded in the local national meteorological station. The thermal perception criterion of Chenzhou citizens was investigated, and thermal isotherms were employed to interpret the thermal perception distribution throughout the year. Analytical results revealed that the annual indoor thermal environment would deteriorate along with the growth of the window-to-wall ratio in Chenzhou, with the very hot thermal perception environment covering the months from March to October once the window-to-wall ratio outnumbered 60.00%. Furthermore, the hot and very hot thermal perception environments originated in the ranges of 0.00% to 20.00% and that of 20.00% to 40.00%, respectively. Furthermore, if the window-to-wall ratios (WWRs) outnumbered 40%, their effects on the indoor thermal perception environment would gradually decrease and be powerless once that exceeded 80%.

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Evaluation of Thermal Behavior of the Skeleton in a Green Building with the Aid of TABS

E3S Web of Conferences ◽

10.1051/e3sconf/201911101085 ◽

2019 ◽

Vol 111 ◽

pp. 01085

Author(s):

Hiroshi Muramatsu ◽

Tatsuo Nobe

Keyword(s):

Heat Flux ◽

Thermal Behavior ◽

Air Conditioning ◽

Natural Ventilation ◽

Thermal Environment ◽

Concrete Slab ◽

Ventilation System ◽

Office Building ◽

Air Conditioning System ◽

Indoor Thermal Environment

In this study, an office building in Japan that incorporates energy-saving features and environmental technologies was investigated. This office building features a green façade, natural ventilation, a concrete slab with no suspended ceilings, and thermo-active building systems. Two airconditioning systems were installed in this building—a ceiling radiation air-conditioning system and a whole floor-blow off air conditioning system. In addition, a natural ventilation system was installed. We surveyed the heat flux of the ceiling surface and indoor thermal environment of this building from 2015 through 2016. The ceiling using the heat storage amount of concrete maintains a constant temperature in the workplace during as well as after office hours. We also performed detailed measurements of the heat flux of the ceiling surface and indoor thermal environment in the summer of 2017. The results showed that the ceiling radiation air-conditioning system provided a stable thermal environment. Furthermore, we report that making use of the thermal behavior of the skeleton improved the operation of the ceiling radiation airconditioning system.

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