ASME Journal of Engineering for Sustainable Buildings and Citieshttp://yetl.yabesh.ir/yetl1/handle/yetl/42731162026-04-10T13:00:58Z2026-04-10T13:00:58ZPerformance Analysis and Optimization of an Air–Water Heat Pump System for Residential Applications in a Subtropical Monsoon ClimateNi, ChenxiKe, QingdiTan, ShiyaoOoi, Kim Tiowhttp://yetl.yabesh.ir/yetl1/handle/yetl/43107872026-02-17T21:53:06Z2025-01-01T00:00:00ZPerformance Analysis and Optimization of an Air–Water Heat Pump System for Residential Applications in a Subtropical Monsoon Climate
Ni, Chenxi; Ke, Qingdi; Tan, Shiyao; Ooi, Kim Tiow
An air–water heat pump was developed and tested for a centralized floor heating system, which provides hot water for four villas in a community located in a mid-latitude region of the Northern Hemisphere with a subtropical monsoon climate. The system's modular chiller unit consists of four compressor units, regulating the water temperature in the chiller's water tank, and it operates as part of an efficient centralized heating system. The heating control and defrosting strategies were determined by real-time and comprehensive energy efficiency ratios, along with the temperature difference between the outdoor heat exchanger and the ambient environment. Based on the test results of the outdoor unit, a suitable thermal system was selected, and a 93-day field test was conducted on the air–water heat pump during winter. Throughout the field test, the compression ratio (π) was maintained within a safe range of 2.67–5.79. Additionally, the daily average energy efficiency ratio ranged from 2.32 to 4.71, while the daily average heat capacity varied between 45.43 kW and 127.52 kW. The indoor temperature remained stable at approximately 19 °C, demonstrating the heat pump system's strong environmental adaptability and high energy efficiency under the given control principles.
2025-01-01T00:00:00ZBeneficiaries' Role in Averting Quality Challenges in Government Social Housing ConstructionAmoah, Christopherhttp://yetl.yabesh.ir/yetl1/handle/yetl/43107592026-02-17T21:51:58Z2025-01-01T00:00:00ZBeneficiaries' Role in Averting Quality Challenges in Government Social Housing Construction
Amoah, Christopher
Upon assuming office in 1994, the South African government began constructing social housing for the less privileged to improve their socioeconomic living standards. However, one of the primary factors behind the rising unhappiness with government-constructed social housing is the beneficiaries' lack of involvement. The study sought to identify beneficiaries' role in averting quality challenges in government social housing construction. A qualitative approach using random sampling was used to interview construction professionals with experience constructing government social housing. Online interviews were conducted with 29 participants, and the data were analyzed using a thematic content analysis method to generate themes and subthemes. The results indicate that to avert quality challenges in government-constructed social housing, the beneficiaries have a considerable role in the planning, construction, and postconstruction phases of the project implementation. Beneficiaries must be provided with the necessary documentation, prevent political interference, participate in the construction process, monitor progress, and train to maintain the houses after construction. The lack of participation of beneficiaries in government-constructed social housing leads to new housing construction with subpar quality standards, leading to the dissatisfaction of beneficiaries and the waste of public funds. There is a need to institute measures to enhance the beneficiaries' participation in the project implementation process to achieve the desired outcome. This study indicates how beneficiaries can partake in the development process of government-constructed social housing. The findings will enable beneficiaries to participate in ensuring satisfactory constructed social housing.
2025-01-01T00:00:00ZThe Role of Embodied Carbon in Sustainable Construction: A Review of Qatar's Practices and PerspectivesRayaru Kandiyil, DilbaSadique, MonowerLee, DeniseAmoako-Attah, JosephAl Mufti, Rafalhttp://yetl.yabesh.ir/yetl1/handle/yetl/43105962026-02-17T21:45:34Z2025-01-01T00:00:00ZThe Role of Embodied Carbon in Sustainable Construction: A Review of Qatar's Practices and Perspectives
Rayaru Kandiyil, Dilba; Sadique, Monower; Lee, Denise; Amoako-Attah, Joseph; Al Mufti, Rafal
This study explores the urgent need for an embodied carbon (EC) assessment framework within Qatar's construction sector, driven by the country's rapid development and high carbon intensity in construction materials, such as cement and steel. Employing a systematic literature review through the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) methodology and Visualization of Similarities (VOS) viewer for bibliometric analysis, this study identifies major gaps in Qatar-specific EC data and regulation. It highlights global best practices, particularly those from countries with mandated EC regulations, and discusses their potential adaptation to Qatar's unique environmental and economic context. This study advocates the establishment of a comprehensive EC database to inform construction practices aligned with Qatar's sustainability goals under its National Vision 2030. The findings suggest that a regionally adapted EC framework would significantly aid Qatar in reducing greenhouse gas emissions, given the country's heavy reliance on energy-intensive materials and its extreme climate. The study concludes with recommendations for the policy integration of EC assessments in Qatar's building sector, aiming to support sustainable urban development and climate resilience in the face of intensifying environmental challenges.
2025-01-01T00:00:00ZPerformance Analysis and Optimization of an Air–Water Heat Pump System for Residential Applications in a Subtropical Monsoon ClimateNi, ChenxiKe, QingdiTan, ShiyaoOoi, Kim Tiowhttp://yetl.yabesh.ir/yetl1/handle/yetl/43086352025-08-20T09:39:27Z2025-01-01T00:00:00ZPerformance Analysis and Optimization of an Air–Water Heat Pump System for Residential Applications in a Subtropical Monsoon Climate
Ni, Chenxi; Ke, Qingdi; Tan, Shiyao; Ooi, Kim Tiow
An air–water heat pump was developed and tested for a centralized floor heating system, which provides hot water for four villas in a community located in a mid-latitude region of the Northern Hemisphere with a subtropical monsoon climate. The system's modular chiller unit consists of four compressor units, regulating the water temperature in the chiller's water tank, and it operates as part of an efficient centralized heating system. The heating control and defrosting strategies were determined by real-time and comprehensive energy efficiency ratios, along with the temperature difference between the outdoor heat exchanger and the ambient environment. Based on the test results of the outdoor unit, a suitable thermal system was selected, and a 93-day field test was conducted on the air–water heat pump during winter. Throughout the field test, the compression ratio (π) was maintained within a safe range of 2.67–5.79. Additionally, the daily average energy efficiency ratio ranged from 2.32 to 4.71, while the daily average heat capacity varied between 45.43 kW and 127.52 kW. The indoor temperature remained stable at approximately 19 °C, demonstrating the heat pump system's strong environmental adaptability and high energy efficiency under the given control principles.
2025-01-01T00:00:00Z