scholarly journals Survey on the Indoor Thermal Environment and Passive Design of Rural Residential Houses in the HSCW Zone of China

2019 ◽  
Vol 11 (22) ◽  
pp. 6471 ◽  
Author(s):  
Rui ◽  
Zhang ◽  
Shi ◽  
Pan ◽  
Chen ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Room Temperature ◽  
Phase Change Materials ◽  
Thermal Environment ◽  
High Energy ◽  
Building Envelope ◽  
Current Status ◽  
Design Strategies ◽  
Indoor Thermal Environment ◽  
Passive Design

Despite their high energy consumption, rural residential houses in the hot summer and cold winter (HSCW) zone still have a generally poor indoor thermal environment. The objective of this study was to understand the current status of the indoor thermal environment for rural residential houses in the HSCW zone and analyze its cause in order to develop some strategies for improvement through passive design of the building envelope. Face-to-face questionnaires and interviews, air-tightness testing, and temperature and humidity monitoring were conducted to understand the building envelope, energy consumption, and indoor thermal environment. Then, some passive design strategies were simulated, including the application of functional interior materials such as hygroscopic and phase change materials. An overall passive design for the building envelope can increase the room temperature by 3.6 °C, reduce the indoor relative humidity by 12% in the winter, and reduce the room temperature by 4.4 °C in the summer. In addition, the annual energy-saving rate can reach ~35%.

scholarly journals Towards Sustainable Development: Building’s Retrofitting with PCMs to Enhance the Indoor Thermal Comfort in Tropical Climate, Malaysia

2021 ◽  
Vol 13 (7) ◽  
pp. 3614
Author(s):  
Zeyad Amin Al-Absi ◽  
Mohd Isa Mohd Hafizal ◽  
Mazran Ismail ◽  
Azhar Ghazali
Keyword(s):  
Climate Change ◽  
Sustainable Development ◽  
Thermal Comfort ◽  
Phase Change Materials ◽  
Thermal Environment ◽  
High Energy ◽  
Transition Temperatures ◽  
Indoor Thermal Environment ◽  
Adaptive Thermal Comfort ◽  
The Difference

Building sector is associated with high energy consumption and greenhouse gas emissions, which contribute to climate change. Sustainable development emphasizes any actions to reduce climate change and its effect. In Malaysia, half of the energy utilized in buildings goes towards building cooling. Thermal comfort studies and adaptive thermal comfort models reflect the high comfort temperatures for Malaysians in naturally conditioned buildings, which make it possible to tackle the difference between buildings’ indoor temperature and the required comfort temperature by using proper passive measures. This study investigates the effectiveness of building’s retrofitting with phase change materials (PCMs) as a passive cooling technology to improve the indoor thermal environment for more comfortable conditions. PCM sheets were numerically investigated below the internal finishing of the walls. The investigation involved an optimization study for the PCMs transition temperatures and quantities. The results showed significant improvement in the indoor thermal environment, especially when using lower transition temperatures and higher quantities of PCMs. Therefore, the monthly thermal discomfort time has decreased completely, while the thermal comfort time has increased to as high as 98%. The PCM was effective year-round and the optimum performance for the investigated conditions was achieved when using 18mm layer of PCM27-26.

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 Improving energy efficiency of school buildings during winter season using passive design strategies

2020 ◽  
Vol 5 ◽  
pp. 1 ◽  
Author(s):  
Sahar Zahiri ◽  
Hasim Altan
Keyword(s):  
Energy Efficiency ◽  
Indoor Air ◽  
Energy Use ◽  
Simulation Analysis ◽  
Thermal Environment ◽  
Winter Season ◽  
Field Studies ◽  
Design Strategies ◽  
Indoor Thermal Environment ◽  
Passive Design

Passive building design can improve energy efficiency of buildings, while providing comfortable indoor environment for occupants with minimum mechanical energy use. The foundation of passive design depends on natural sources of energy, which uses building architecture and surrounding environment to minimise heating and cooling loads of buildings with minimum operating and maintenance costs. The correlation of local climate with shape and thermal performance of buildings is one of the main considerations of passive design approach to reduce energy use and increase thermal comfort of occupants. This paper focuses on a series of field studies and building simulation analysis to improve thermal performance of female secondary school buildings in the city of Tehran in Iran during winter season using passive design strategies. The field studies included measuring indoor air temperature, as well as a questionnaire-based survey in a cold winter season in a typical female secondary school building. The on-site monitoring assessed indoor air temperature of classrooms while the occupants completed questionnaires covering their thermal sensations and thermal preferences. Moreover, building thermal simulation analysis were carried out using DesignBuilder tool to evaluate and improve thermal performance of classrooms based on students' thermal requirements and passive design strategies. The simulation analysis started from the basic school building model, investigating various passive design strategies to predict the optimum design strategies for the case study. The simulation results determined how to provide classrooms that are more comfortable for students with minimum energy use. The results of the field studies indicated that indoor thermal environment were usually comfortable for female students based on 7-point ASHRAE scale. However, most of the occupants preferred their indoor thermal environment to be improved. Moreover, simulation results showed that building fabrics and thermal properties, as well as glazing and orientation had significant impacts on indoor air temperature and thermal comfort and using appropriate passive design strategies could improve energy efficiency of the building considerably. Therefore, in order to enhance indoor thermal environment and to increase learning performance of students, it is necessary to use appropriate low energy methods, which can reduce the needs for mechanical energy systems and hence save energy.

Low-cost retrofit packages for residential buildings in hot-humid Lagos, Nigeria

2019 ◽  
Vol 37 (3) ◽  
pp. 250-272 ◽  
Author(s):  
Nwakaego Chikaodinaka Onyenokporo ◽  
Ekele Thompson Ochedi
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Low Income ◽  
Residential Buildings ◽  
Relevant Literature ◽  
Building Envelope ◽  
Design Strategies ◽  
Content Type ◽  
Passive Design ◽  
Reducing Energy

Purpose The purpose of this paper is to develop a set of affordable retrofit packages that can be applied to existing residential buildings in hot-humid regions to improve occupants’ thermal comfort and reduce energy consumption. Design/methodology/approach A critical review of relevant literature to identify passive design strategies for improving thermal comfort and reducing energy consumption in hot-humid climates with focus on the building envelope was conducted in addition to a simulation study of an existing building typology in study area. Findings There is enormous potential to reduce energy costs and improve thermal comfort through building retrofit packages which is a recent concept in developing countries, such as Nigeria. Analysing the results of the retrofit interventions using building energy simulation helped in developing affordable retrofit packages which had optimum effect in improving indoor comfort temperature to the neutral temperature specified for hot humid Nigeria and further down to 3°C less than that of the reference building used. The use of passive design strategies to retrofit the building might help homeowners reduce their annual energy consumption by up to 46.3 per cent just by improving the indoor thermal comfort. Originality/value In addition to improving thermal comfort and reducing energy consumption, this research identified affordable retrofit packages and considered its cost implications especially to low-income earners who form a larger population of Lagos, Nigeria, as this was not considered by many previous researchers.

scholarly journals THE APPLICATION OF PASSIVE DESIGN STRATEGIES AS SUSTAINABLE OPERATION AND MAINTENANCE IN A MODEL CONFERENCE CENTRES (A CASE STUDY OF AMINU KANO CENTRE FOR DEMOCRATIC RESEARCH AND TRAINING (AKCDR&T))

2021 ◽  
pp. 23-39
Author(s):  
Alfa Sharif ◽  
Muhammad Mukarram ◽  
Isyaku Rabi’u ◽  
Rabi’u Inusa
Keyword(s):  
Energy Consumption ◽  
Natural Ventilation ◽  
Relevant Information ◽  
Building Envelope ◽  
Comfort Level ◽  
Design Parameters ◽  
Design Strategies ◽  
Passive Design ◽  
Conference Centre

ABSTRACT: This research sought to reduce uncomfortable conditions created by extremes of heat and dryness in order to achieve well balanced indoor and outdoor climate, through the application of passive design strategies in Conference Centre located in hot dry climate of Kano Nigeria. Passive design utilizes natural sources of heating and cooling breezes. It is achieved by appropriately orientating the building on its site and carefully designing the building envelope (roof, walls, windows and floor). External features such as fountain, soft landscaping and proper site planning improves micro climate which in turn helped in achieving good passive design. The methodology employed is case study and relevant information sourced from pertinent literature and the internet was taken into consideration. Research has shown that more than40% of energy consumption in any building is used for cooling and lighting in order to achieve comfort level. In the course of the research, the building was studied to evaluate the use of passive elements that relates to passive lighting and cooling which are the main source of energy consumption such as building envelop, natural lighting, natural ventilation, Site and external spaces, building form, building orientation, wall/window shading and existing of energy source on conference centre building. Research has shown that, the design parameters obtained from field survey are the principal factors responsible for any good passive design of most public building such as conference centre building.

scholarly journals Thermal Energy Performance Simulation of a Residential Building Retrofitted with Passive Design Strategies: A Case Study in Mexico

2021 ◽  
Vol 13 (14) ◽  
pp. 8064
Author(s):  
Ana Paola Vargas ◽  
Leon Hamui
Keyword(s):  
Energy Consumption ◽  
Thermal Energy ◽  
Energy Savings ◽  
Energy Performance ◽  
High Energy ◽  
Base Case ◽  
Single Family ◽  
Design Strategies ◽  
Performance Simulation ◽  
Passive Design

High energy consumption as a result of an inefficient design has both economic and environmental repercussions throughout the life cycle of a building. In Mexico, the residential sector is the third-largest final energy consumer, therefore improving the performance of existing buildings is considered an effective method in achieving energy savings. Moreover, in Mexico warm climate regions predominate, which impacts energy consumption. This article examines a linked, single-family house located in the hot-humid climate city of Villahermosa, Tabasco (México). DesignBuilder software was used to conduct the thermal energy performance simulation of the existing building (base case) and to evaluate the energy-saving potentials by implementing different passive design strategies. As a result, the annual electricity consumption of the base case decreased a maximum of 2.0% with the passive design strategy in exterior windows, 4.9% in walls and, 13.7% reduction in roofs, the latter being the enclosure with the greatest reduction achieved. Nevertheless, a final adaptation proposal with the passive design strategies, whose results represented the highest energy savings, accomplished a total reduction of 23.5% with a payback period of 5.8 years.

scholarly journals Energy-saving potential of intermittent heating system: Influence of composite phase change wall and optimization strategy

2020 ◽  
pp. 014459872096921
Author(s):  
Yanru Li ◽  
Enshen Long ◽  
Lili Zhang ◽  
Xiangyu Dong ◽  
Suo Wang
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Phase Change ◽  
Air Temperature ◽  
Indoor Air ◽  
Thermal Environment ◽  
Optimization Strategy ◽  
Indoor Thermal Environment ◽  
Indoor Thermal Comfort ◽  
Intermittent Heating

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.

scholarly journals Study on energy loss and thermal environment through door open while air conditioner running

2019 ◽  
Vol 111 ◽  
pp. 06035
Author(s):  
Sihwan Lee
Keyword(s):  
Energy Consumption ◽  
Indoor Air ◽  
Room Temperature ◽  
Thermal Environment ◽  
Infiltration Rate ◽  
Operating Efficiency ◽  
Air Conditioner ◽  
Air Conditioners ◽  
Cooling Period ◽  
Closed State

While air conditioner is running, opening doors and windows is a great way to reduce operating efficiency and undermine the air conditioning system’s ability to bring the indoor to a comfortable temperature. The purpose of this study is to evaluate the heat loss and thermal environment through the door open while air conditioner running. To achieve this goal, using full-scale measurement with the commercial store during the cooling period, the infiltration rate, thermal environment and energy consumption of air conditioners with door opened and door closed state were measured. The measured results show that the infiltration rate at the door opened state was increased by about 21.3 times compared to the door closed state. When the set temperature of the air conditioner was 24 °C, the room temperature in the opening gate cooling was measured to be about 5 °C higher than the closing gate cooling. However, the energy consumption was measured approximately 12 kWh/day and there was no difference with door state. This means that the energy consumption is not increased if the indoor air temperature would not reach the set point temperature of air conditioner.

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