scholarly journals Researching Indoor Comfort of Teaching Buildings in Hot Summer and Cold Winter Area

2015 ◽  
Author(s):  
Qi Zhang
Keyword(s):  
Cold Winter ◽  
Indoor Comfort

Analysis of the Heating and Energy Saving Effect of Capillary Radiant Ceiling in Hot Summer and Cold Winter Area

2014 ◽  
Vol 960-961 ◽  
pp. 599-602 ◽  
Author(s):  
Qing Mei Wen ◽  
Dong Yang ◽  
Ming Jiu Chen ◽  
Yong An Li ◽  
Shi Jun Wei
Keyword(s):  
Finite Element ◽  
Energy Saving ◽  
Composite System ◽  
Heating System ◽  
Radiant Heating ◽  
Cold Winter ◽  
Radiation Heating ◽  
Indoor Temperature ◽  
Saving Effect ◽  
Indoor Comfort

This paper introduces the advantages of capillary roof radiant heating system, by using finite element numerical method, the indoor temperature distribution of capillary radiant roof and underfloor supply air composite system is simulated, using the theory of exergy to analysis the energy saving of the system, the result proves that the system can well satisfy indoor comfort requirements, and compared with the floor radiation heating system can saving energy 65.8%, has great research value.

Impact Analysis of the Thickness of Wall Insulation on Indoor Comfort in Hot Summer and Cold Winter Area

2012 ◽  
Vol 193-194 ◽  
pp. 1069-1074
Author(s):  
Mei Xiang Fang ◽  
Ting Yong Fang ◽  
Jun Chen ◽  
Zhen Yu
Keyword(s):  
Layer Thickness ◽  
Impact Analysis ◽  
Residential Building ◽  
Simulation Software ◽  
Building Energy Efficiency ◽  
Insulation Layer ◽  
Cold Winter ◽  
New Energy ◽  
Building Wall ◽  
Indoor Comfort

With the continuous development of building energy efficiency, Wall insulation technology has become a new energy-saving technology. This paper mainly to a residential building model as an example in hot summer and cold winter zone (as in hefei). The ECOTECT simulation software was used to analysis the indoor uncomfortable period in different thickness of the exterior insulation layer. The Indoor uncomfortable period include too hot indoor discomfort period, too cold indoor uncomfortable period and total (obtain too hot and too cold) indoor discomfort period. According to the simulation result to analysis the relation between insulation layer thickness and the three kinds of indoor uncomfortable period. We can draw the total (obtain too hot and too cold) indoor uncomfortable period was not lowering with the increase of the insulation layer thickness, so we can choose the thickness of insulation layer, according to the influence of the thickness of insulation layer to the uncomfortable period, then providing certain reference for selection the thickness of insulation layer of energy conservation of the building wall.

scholarly journals Indoor Climate Performance in a Renovated School Building

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2827
Author(s):  
Pavla Mocová ◽  
Jitka Mohelníková
Keyword(s):  
Indoor Environment ◽  
Natural Ventilation ◽  
Carbon Dioxide Concentration ◽  
Heating System ◽  
Climatic Conditions ◽  
School Building ◽  
Ventilation Strategy ◽  
Indoor Climate ◽  
Microbiological Testing ◽  
Indoor Comfort

Indoor climate comfort is important for school buildings. Nowadays, this is a topical problem, especially in renovated buildings. Poorly ventilated school classrooms create improper conditions for classrooms. A post-occupancy study was performed in a school building in temperate climatic conditions. The evaluation was based on the results of long-term monitoring of the natural ventilation strategy and measurements of the carbon dioxide concentration in the school classroom’s indoor environment. The monitoring was carried out in an old school building that was constructed in the 1970s and compared to testing carried out in the same school classroom after the building was renovated in 2016. Surprisingly, the renovated classroom had a significantly higher concentration of CO2. It was found that this was due to the regulation of the heating system and the new airtight windows. The occupants of the renovated classroom have a maintained thermal comfort, but natural ventilation is rather neglected. A controlled ventilation strategy and installation of heat recovery units are recommended to solve these problems with the classroom’s indoor environment. Microbiological testing of the surfaces in school classrooms also shows the importance of fresh air and solar radiation access for indoor comfort.

A Nationwide Study of Skiing and Snowboarding-Related Facial Trauma

2021 ◽  
pp. 194338752199723 ◽  
Author(s):  
Thomas J. Sorenson ◽  
Vedant Borad ◽  
Warren Schubert
Keyword(s):  
Surveillance System ◽  
Pediatric Patients ◽  
Facial Trauma ◽  
Facial Fractures ◽  
Facial Fracture ◽  
Cold Winter ◽  
Injury Surveillance System ◽  
Weighted Estimates ◽  
Patient Demographics ◽  
The Us

Study Design: Retrospective descriptive observational study. Purpose: Skiing and snowboarding offers valuable opportunities for outdoor physical activity throughout the cold winter months, but these activities can result in substantial personally injury. This study aimed to analyze trends in skiing and snowboarding-related facial trauma epidemiology. Methods: The National Electronic Injury Surveillance System (NEISS) was queried for facial trauma related to skiing and snowboarding treated in United States (US) emergency departments between 2010 and 2019. These data and weighted estimates were used to analyze patient demographics, injury location, and etiology. Results: A total of 361 skiing or snowboarding-related facial injuries were recorded. Lacerations were most common injury (165/361; 45.7%), and facial fractures occurred in 21.6% (78/261) of patients. The most common facial fracture locations are the nose (38/78; 48.7%), orbit (17/78; 21.8%), and mandible (15/78; 19.2%). Pediatric patients accounted for 52% (187/361) of these injuries and had higher rates of lacerations (51.9% vs 39.1%, P < 0.05) and hospital admission (4.8% vs 1.15%, P < 0.05) than adults. Adults had a higher rate of facial fracture (30% vs 13.9%, P < 0.001) than children. Conclusions: Skiing and snowboarding-related facial trauma is relatively uncommon in the US. In general, these injuries are largely decreasing, but facial fractures still occur not infrequently during these activities. Based on our data, we strongly urge helmet manufacturers to increase the availability of recreational snowsport helmets that include nose, orbit, and mandible protections, which could help to prevent many of these injuries.

Intermittent heating performance of different terminals in hot summer and cold winter zone in China based on field test

2021 ◽  
Vol 43 ◽  
pp. 102546
Author(s):  
Mengfan Duan ◽  
Yifan Wu ◽  
Hongli Sun ◽  
Zixu Yang ◽  
Wenxing Shi ◽  
...  
Keyword(s):  
Field Test ◽  
Cold Winter ◽  
Heating Performance ◽  
Intermittent Heating

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.

scholarly journals A Study of Optimal Specifications for Light Shelves with Photovoltaic Modules to Improve Indoor Comfort and Save Building Energy

2021 ◽  
Vol 18 (5) ◽  
pp. 2574
Author(s):  
Heangwoo Lee ◽  
Xiaolong Zhao ◽  
Janghoo Seo
Keyword(s):  
Energy Savings ◽  
Building Energy ◽  
Energy Performance ◽  
Building Energy Efficiency ◽  
Efficiency Change ◽  
Photovoltaic Modules ◽  
Heating And Cooling ◽  
Pv Module ◽  
Pv Modules ◽  
Indoor Comfort

Recent studies on light shelves found that building energy efficiency could be maximized by applying photovoltaic (PV) modules to light shelf reflectors. Although PV modules generate a substantial amount of heat and change the consumption of indoor heating and cooling energy, performance evaluations carried out thus far have not considered these factors. This study validated the effectiveness of PV module light shelves and determined optimal specifications while considering heating and cooling energy savings. A full-scale testbed was built to evaluate performance according to light shelf variables. The uniformity ratio was found to improve according to the light shelf angle value and decreased as the PV module installation area increased. It was determined that PV modules should be considered in the design of light shelves as their daylighting and concentration efficiency change according to their angles. PV modules installed on light shelves were also found to change the indoor cooling and heating environment; the degree of such change increased as the area of the PV module increased. Lastly, light shelf specifications for reducing building energy, including heating and cooling energy, were not found to apply to PV modules since PV modules on light shelf reflectors increase building energy consumption.

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