Field study on thermal comfort and energy saving potential in 11 split air-conditioned office buildings in Changsha, China

Wu, Zhibin; Li, Nianping; Wargocki, Paweł; Peng, Jinqing; Li, Jingming; Cui, Haijiao

doi:10.1016/j.energy.2019.05.204

Cited by 87 publications

(52 citation statements)

References 31 publications

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“…A study revealed that CHWST up to 10°C may be viable for a given ∆T of 6°C, which leads to improved chiller performance [1]. Another recent study involving 11 office buildings in China employing split-system air-conditioning units found that occupants had adapted to the prevailing thermal environment and accepted a warmer temperature of 26°C, with a potential to save 8.6% energy during summer in buildings employing split-system air-conditioning units [2]. Whilst such strategies for chilled water or DX coils can be easily incorporated in new building designs, it is also a no-cost intervention during the operational stages in existing buildings.…”

Section: High Temperature Cooling and Dehumidificationmentioning

confidence: 99%

HVAC System Enhancements for Improved IEQ and Energy Efficiency “Tropical Low Hanging Fruits”

Sekhar¹

2020

Proceedings of the 50th International HVAC&R Congress and Exhibition

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The HVAC system needs to serve the primary role of conditioning the air before it is delivered to the occupied zones of a building. The increasing focus on human centricity in buildings and the unquestionable need to curb the dependency on fossil fuels due to climate change considerations has necessitated the HVAC design professionals to explore innovative means and strategies to enhance HVAC system performance for improved Indoor Environmental Quality (IEQ) and energy efficiency. This paper deals with simple cost effective interventions, comprising new strategies or technologies in the tropics, dubbed Tropical Low Hanging Fruits that could significantly improve the energy performance of the buildings whilst simultaneously enhancing IEQ. It is obvious that new technologies or strategies are easier to be implemented in new buildings. However, such technologies could be easily seen as viable options during the refurbishment phase of an existing building. In addition, several interventions become easily possible in the normal operation stage of a building. The various technologies/strategies presented in this paper are discussed in the context of both new and existing buildings.

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Section: High Temperature Cooling and Dehumidificationmentioning

confidence: 99%

HVAC System Enhancements for Improved IEQ and Energy Efficiency “Tropical Low Hanging Fruits”

Sekhar¹

2020

Proceedings of the 50th International HVAC&R Congress and Exhibition

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“…To evaluate the eco-cost of SAC, we first need to analyze its basic components. In reality, a SAC is mainly composed of an evaporator, a compressor, a condenser and a capillary [33], as shown in Fig.2. The evaporator uses a liquid cryogenic refrigerant to evaporate at a low pressure as it absorbs the heat of the cooling medium to achieve the purpose of refrigeration.…”

Section: Basic Components Of Sacmentioning

confidence: 99%

Eco-Cost Analysis of Split Air-Conditioner Using Activity-Based Costing Method

Liu

Yang³

et al. 2020

IEEE Access

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Split air conditioner (SAC) plays a critical role for temperature control of buildings. In recent years, the manufacturing process of SAC tends to consider energy-saving and environmental protection factors to reduce air pollution and alleviate energy crisis. However, the design of environmental-friendly SAC will increase the manufacturing cost, thereby increasing the burden on airconditioning companies. Therefore, the eco-cost analysis of SAC is of great significance for air conditioner manufacturers. To this end, a new SAC eco-cost assessment method based on activity based costing method is innovatively proposed in this paper. In this method, a K-nearest neighbor algorithm is used to deal with the missing data in SAC samples. An environmental and non-environmental cost assessment approach is developed based on the activity-based costing method to estimate the eco-cost of SAC over its whole life cycle. In addition, the impact of energy efficiency deviation on SAC eco-cost is numerically analyzed. Finally, the proposed ecocost assessment method is programmed on a Gabi software, and validated using real SAC data from a Chinese airconditioning company. Simulation results show that the proposed method can provide an estimate of the eco-cost of SAC, thus helping airconditioning companies to improve their competitiveness in the future where energy-saving and emission reduction are increasingly important. INDEX TERMS Eco-cost analysis, split air conditioner, life cycle assessment, activity-based costing method, Gabi software.

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“…A PMV model of thermal comfort is currently used worldwide to assess thermal comfort. [22][23][24] However, multiple pieces of evidence have shown that the PMV model is not generally applicable in every building and climate zone. [25][26][27][28][29][30] Given the aforementioned evidence and interest for architectural design and building engineering in ascertaining whether the discrepancies found in other countries and climatic zones regarding the PMV model of thermal sensation are also applicable to Portugal, the study reported in this article focuses on a Portuguese sample of young adults.…”

Section: Theory and Aimmentioning

confidence: 99%

“…A PMV model of thermal comfort is currently used worldwide to assess thermal comfort . However, multiple pieces of evidence have shown that the PMV model is not generally applicable in every building and climate zone .…”

Section: Introductionmentioning

confidence: 99%

Season influence on rapid thermal sensation assessment by young adults

Coelho

Silva

2019

Engineering Reports

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Thermal comfort is one of the most important ergonomic aspects of building occupancy. In this research, laboratory experiments are performed in a climatic chamber and described in detail. Experiments are carried out under two scenarios: with two different college students cohorts and with five different but comparable experimental conditions in each cohort. Three hundred twenty‐two individual assessments under specific controlled thermal environment conditions are collected. The actual thermal sensation assessments obtained in the experiments are compared to the results obtained by a predicted mean vote (PMV) model. The correlation analysis shows that statistically significant differences are meaningful between the spring‐summer and the autumn‐winter experiments but not between genders. This paper discusses the plausible factors contributing to the different correlations experienced in the autumn‐winter and spring‐summer experiments. A correction factor between PMV according to Fanger's comfort equation and the actual thermal sensation values reported by the participants is also sought with a focus on the seasonal effects. The predicted results are in good agreement with the experimental results. This allows for further considerations about the influence of the season on the initial thermal sensations experienced by young adults.

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Field study on thermal comfort and energy saving potential in 11 split air-conditioned office buildings in Changsha, China

Cited by 87 publications

References 31 publications

HVAC System Enhancements for Improved IEQ and Energy Efficiency “Tropical Low Hanging Fruits”

HVAC System Enhancements for Improved IEQ and Energy Efficiency “Tropical Low Hanging Fruits”

Eco-Cost Analysis of Split Air-Conditioner Using Activity-Based Costing Method

Season influence on rapid thermal sensation assessment by young adults

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