scholarly journals STUDY ON THE INDOOR THERMAL ENVIRONMENT AND ENERGY SAVING BY SCHUDULE ON-OFF CONTROL WITH PACKAGE AIR-CONDITIONER

2008 ◽  
Vol 73 (633) ◽  
pp. 1283-1289 ◽  
Author(s):  
Sung-ki SONG
Keyword(s):  
Energy Saving ◽  
Thermal Environment ◽  
Air Conditioner ◽  
Indoor Thermal Environment

scholarly journals Improvements in Energy Saving and Thermal Environment after Retrofitting with Interior Insulation in Intermittently Cooled Residences in Hot-Summer/Cold-Winter Zone of China: A Case Study in Chengdu

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2776
Author(s):  
Xin Ye ◽  
Jun Lu ◽  
Tao Zhang ◽  
Yupeng Wang ◽  
Hiroatsu Fukuda
Keyword(s):  
Energy Saving ◽  
Thermal Environment ◽  
Real Life ◽  
Average Energy ◽  
Experimental Result ◽  
Cold Winter ◽  
The South ◽  
Indoor Thermal Environment ◽  
Space Cooling

Space cooling is currently the fastest-growing end-user in buildings. The global warming trend combined with increased population and economic development will lead to accelerated growth in space cooling in the future, especially in China. The hot summer and cold winter (HSCW) zone is the most densely populated and economically developed region in China, but with the worst indoor thermal environment. Relatively few studies have been conducted on the actual measurements in the optimization of insulation design under typical intermittent cooling modes in this region. This case study was conducted in Chengdu—the two residences selected were identical in design, but the south bedroom of the case study residence had interior insulation (inside insulation on all opaque interior surfaces of a space) retrofitted in the bedroom area in 2017. In August 2019, a comparative on-site measurement was done to investigate the effect of the retrofit work under three typical intermittent cooling patterns in the real-life scenario. The experimental result shows that interior insulation provides a significant improvement in energy-saving and the indoor thermal environment. The average energy savings in daily cooling energy consumption of the south bedroom is 42.09%, with the maximum reaching 48.91%. In the bedroom with interior insulation retrofit, the indoor temperature is closer to the set temperature and the vertical temperature difference is smaller during the cooling period; when the air conditioner is off, the room remains a comfortable temperature for a slightly longer time.

Study on the Thermal Performance of the Vernacular Dwellings in Wei-He Plain of Shaanxi Province

2012 ◽  
Vol 476-478 ◽  
pp. 1589-1595
Author(s):  
Yi Ping Zhu ◽  
Xi Liao ◽  
Shu Yun Wu ◽  
Jing Luo ◽  
Yuan Jiang ◽  
...  
Keyword(s):  
Energy Saving ◽  
Thermal Insulation ◽  
Thermal Performance ◽  
Thermal Environment ◽  
Local Area ◽  
Shaanxi Province ◽  
Indoor Thermal Environment ◽  
Questionnaire Surveys

Based on indoor thermal environment test and questionnaire surveys, the paper studies on thermal insulation capacity and indoor thermal environment of the vernacular dwellings in Wei-he Plain of Shaanxi Province, China, and analyses their heating methods and application status. Besides, the popularity of sustainable techniques in local area has been evaluated and summarized. Moreover, the paper discusses the present problems in local indoor thermal environment and energy-saving status.

Study on Energy-Saving Renovation of Existing Heating Masonry-Concrete Residential Buildings

2011 ◽  
Vol 280 ◽  
pp. 147-151 ◽  
Author(s):  
Hong Guo ◽  
Min Fang Su ◽  
Xiao Jun Jin
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy Saving ◽  
Thermal Environment ◽  
Residential Buildings ◽  
Residential Building ◽  
Building Envelope ◽  
Indoor Thermal Environment ◽  
Consumption Situation ◽  
Current Energy

Based on the current energy consumption situation of existing masonry-concrete residential buildings in China, it discussed the main energy-saving renovation policies and technologies. Taking existing masonry-concrete residential building of Taiyuan city as a case, it analyzed its heat loss situations, energy-saving renovation design and reconstruction technologies of building envelope. It discussed energy-saving renovation effects. Energy efficiency and indoor thermal environment improved significantly after energy-saving renovation. The building life is extended.

scholarly journals Research on Indoor Thermal Comfort and Age of Air in Qilou Street Shop under Mechanical Ventilation Scheme: A Case Study of Nanning Traditional Block in Southern China

2021 ◽  
Vol 13 (7) ◽  
pp. 4037
Author(s):  
Xianfeng Huang ◽  
Chen Qu
Keyword(s):  
Mechanical Ventilation ◽  
Air Quality ◽  
Thermal Comfort ◽  
Thermal Environment ◽  
Southern China ◽  
Air Conditioner ◽  
Indoor Thermal Environment ◽  
Indoor Thermal Comfort ◽  
Circulation Mode ◽  
Ventilation Scheme

In hot summers, air conditioning (AC) and mechanical ventilation (such as fans) are used as cooling modes that strongly influence the resultant indoor environment, like thermal comfort and air quality in the shops of a Nanning arcade street (qilou). The air circulation mode in shops greatly affects the indoor thermal environment and level of air freshness. The approaches for effectively improving the indoor thermal comfort and air quality are developed in qilou street shops with air-conditioner in a humid and hot region in southern China. Consequently, the purpose of this study is to assess different ventilation schemes in order to identify the best one. By using two indices, i.e., the predicted mean vote (PMV) and the age of air (AoA), in situ measurement and numerical simulation are conducted to investigate humans’ thermal comfort in extreme summer. Then, the indoor thermal comfort and AoA levels in summer under three different ventilation schemes (upper-inlet–upper-outlet, upper-inlet–bottom-outlet, and side-inlet–side-outlet) are comparatively analyzed through numerical computations of the indoor thermal environment. The results show that the upper-inlet–upper-outlet mode of the AC ventilation scheme led to the creation of a favorable air quality and comfortable thermal environment inside the shop, which will help designers understand the influence of the ventilation scheme on the indoor thermal comfort and health environment.

scholarly journals Field Study on Energy-Saving Behaviour and Patterns of Air-Conditioning Use in a Condominium

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8572
Author(s):  
Kazui Yoshida ◽  
Hom B. Rijal ◽  
Kazuaki Bogaki ◽  
Ayako Mikami ◽  
Hiroto Abe
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Energy Use ◽  
Thermal Environment ◽  
Residential Energy ◽  
Indoor Thermal Environment ◽  
Energy Management Systems ◽  
Home Energy Management ◽  
Questionnaire Surveys ◽  
Floor Heating

In the international movement to combat the threat of climate change, the timely implementation of residential energy-saving practises is becoming an urgent issue. Because the number of apartments is increasing, we analysed data from home energy management systems (HEMSs) and data from questionnaire surveys of 309 households in a condominium. We focused on the seasonal variation in air-conditioning (AC) use in living-dining rooms to determine the tendency of energy use for heating/cooling related to the characteristics of flats, the profiles of residents, and energy-saving behaviours. In winter, 80% of residents mainly used gas floor heating rather than AC and 24% did not use AC in winter. In households where someone stays home for long hours, they prefer gas floor heating rather than AC in winter. These households also tend to engage in energy-saving behaviours to adjust the indoor thermal environment. There are several types of energy-saving lifestyles; therefore, effective energy-saving measures should be considered for both energy efficiency and the thermal comfort of residents.

The Detection and Analysis of Different Exterior Decorative Materials CS Panel Solar Radiation Performance Energy Saving Influence

2013 ◽  
Vol 368-370 ◽  
pp. 1007-1012
Author(s):  
Feng Hua Zhao ◽  
Hai Rong Dong ◽  
Y.Y. Zhou
Keyword(s):  
Energy Efficiency ◽  
Solar Radiation ◽  
Energy Saving ◽  
Thermal Environment ◽  
Building Energy ◽  
Radiation Absorption ◽  
Building Energy Efficiency ◽  
Absorption Properties ◽  
Indoor Thermal Environment ◽  
Main Factors

The research of CS panel integration performance of energy saving, load bearing and decoration, shows that exterior materials reflection and absorption of solar radiation is one of the main factors that affects the thermal insulation and building energy efficiency. In this work the experimental detection data is analyzed both quantitatively and qualitatively in order to realize the influence of different solar radiation absorption properties from the outer decorative materials to the CS panel indoor thermal environment and energy-saving. The principle of energy saving optimization choice of the CS panel exterior decorative materials is proposed.

A TOPSIS optimization for the indoor thermal environment through oscillating airflow generated from a cassette split type air conditioner

2020 ◽  
pp. 1420326X2093930
Author(s):  
Yunqing Fan
Keyword(s):  
Thermal Performance ◽  
Cfd Simulation ◽  
Control Method ◽  
Thermal Environment ◽  
Vertical Section ◽  
Thermal Preference ◽  
Air Conditioner ◽  
Indoor Thermal Environment ◽  
Swing Angle ◽  
The Impact

This study evaluates the feasibility of a control method, ‘the Technique for Order of Preference by Similarity to Ideal Solution’ (TOPSIS) for the optimization of the subzone thermal environment by optimizing the oscillating airflow generated from a cassette split type air conditioner. To address the quasi-dynamic thermal comfort problems, various operation swinging angles of the louvre in the supply opening of an air conditioner and swinging periods were investigated by computational fluid dynamics (CFD) simulation. The impact of air supply control strategies (louvres movement) on the indoor thermal environment was evaluated by multi-criteria operation under quasi-dynamic conditions. The operation parameters were shown to have significantly improved the deviation in thermal uniformity by 16.5% and thermal preference by 7.6%. A 40 s swing period and wider swing angles for the operation of the inner louvre would satisfy the thermal uniformity rather than other alternatives. A shorter swing period <20 s is insufficient to allow perfect airflow mixing at the vertical section. For individual target mode such as the room corner, the thermal performance is more sensitive to the swing angle than the swing period; by increasing the swing angle to ±60° to enhance thermal preference, a 24.1% increase in the overall thermal performance would be achieved.

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