Efficiency evaluation of a floor standing air conditioner with different installation positions and air supply parameters applied to a large laboratory

Song, Xianfeng; Xu, Hong; Li, Sasa; Wang, Wenhao; Guo, Jianghui; Yang, Wenyu

doi:10.1016/j.jobe.2020.101701

Cited by 6 publications

(6 citation statements)

References 35 publications

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“…The weights of the variables produced when running the DEA model are estimated so that each DMU gets the best possible efficiency score [48,49]. Hence, the distribution of the weights cannot be argued by the managers to be unfair or unjust as they reflect the strength of each manager.…”

Section: Dea Modeling For Safety Evaluationmentioning

confidence: 99%

A Robust Construction Safety Performance Evaluation Framework for Workers’ Compensation Insurance: A Proposed Alternative to EMR

et al. 2021

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The construction work environment remains one of the most hazardous among all industries. Construction injuries directly impact the workers and the work itself, including personal suffering, construction delays, productivity losses, higher insurance premiums, and possible liability suits for all parties involved in the project. The costs resulting from personal injuries, combined with the associated financial impact resulting from schedule disruptions, insurance hikes, and workers’ compensation, can impact a project’s profitability. Many of these impacts can be minimized or avoided through the continuous assessment and improvement of safety policies and practices. This paper aims to propose a new safety assessment methodology that equips insurance companies and construction managers with an optimal mechanism for evaluating the safety performance of construction companies. The proposed model consists of 20 evaluation criteria that are used to establish the efficiency benchmarks and provide comparison feedback for improving the company’s safety plans and procedures. These criteria are determined based on leading and lagging safety performance indicators. The data envelopment analysis (DEA) technique is used as the underlying model to assess the relative efficiency of safety practices objectively. Two illustration case studies are provided to demonstrate the dual effectiveness of the DEA model. The presented research contributes to the body of knowledge by formalizing a robust, effective, and consistent safety performance assessment. The model equips the company with the ability to track both the progression and the retrogression over time and provides feedback on ineffective practices that need more attention. Simultaneously, the model gives them more detailed safety performance information that can replace the current experience modification rating (EMR) approach. It provides insurance companies with an objective and robust evaluation model for selecting optimum rates for their clients. In addition, the data comparison utility offered by the DEA model and its criteria can be helpful for insurance companies to provide effective advice to their clients on which safety aspects to improve in their future strategies.

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Section: Dea Modeling For Safety Evaluationmentioning

confidence: 99%

A Robust Construction Safety Performance Evaluation Framework for Workers’ Compensation Insurance: A Proposed Alternative to EMR

et al. 2021

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“…Gao [14] experimentally investigated the indoor temperature and velocity distribution of an air conditioning unit under two different deflection angles and two installation positions in a bedroom with an area of 13 m 2 . Xin et al [15] took a large laboratory as the research object, evaluated the efficiency of floor-standing air conditioners in different installation positions and air supply parameters, and studied the effects of different positions of vertical air conditioners on indoor air velocity, air temperature, air relative humidity, and volatile organic compounds diffusion. Summarize and sort out the above scholars' research on the air distribution of vertical air conditioners, and valuable research conclusions were given from various angles, such as the inclination angle of air conditioner guide vanes and air conditioner placement.…”

Section: Introductionmentioning

confidence: 99%

Study on the Recommended Placement and Air Distribution of Split Floor-Standing Room Air Conditioners

Zhang¹,

Gao

Nie

et al. 2022

Int. J. Archit. Eng. Technol.

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In recent years, split floor-standing room air conditioners have been widely used in civil and office buildings because of their high cooling capacity and easy installation, and the air draft sensation has attracted more and more attention. In this study, a target air supply evaluation index for regional thermal comfort evaluation in the work area, the air velocity target value, is proposed. A computational fluid dynamics model for common office is established, and a total of 204 working conditions are numerically simulated for each combination of different positions, different rotation angles, and different air supply velocities (1 m/s, 2 m/s and 3 m/s) of air conditioners in the room. The influence of the rotation angle of the air conditioner on the indoor air distribution was studied, and the distribution of the indoor velocity flow field at different positions was analyzed. The air-conditioning rotation angle that makes the velocity target value of the five preset planes in the room smaller under different conditions is summarized as the recommended rotation angle. The numerical simulation results were verified by experimental means and found to be consistent with the measured results. This study can provide theoretical guidance and reference for the placement of indoor air conditioning units for users in real life.

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“…They concluded that the location of the thermostat greatly affects particle distribution, energy consumption as well as thermal comfort in the room. Xi et al [11] evaluated the efficiency of a floor-standing air conditioning system with different installation positions and supply air parameters based on a laboratory. The results revealed that the placement of the floor-standing air conditioner diagonally across from the door provided the optimal comfort.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Effects of Evaporative Cooler Supply Air Outlet Height on Thermal Comfort

Haruna¹,

RUFAI²,

YAHAYA³

2022

JESR

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Thermal comfort in a space equipped with a direct evaporative cooler is a function of the height of the cooler's supply air outlet. This article attempts to numerically investigate the impact of hybrid downdraft evaporative cooler (HDEC) supply outlet height on occupant thermal comfort in an office building. DesignBuilder CFD parametric simulations was carried out by varying the height of the HDEC supply outlet from 0.1m to 2.4 m, step 0.1 m above ground level, using Predictive Mean Vote (PMV) as an objective function. The results show that the best PMV of -0.27 was obtained at 0.4m above the floor level.

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Efficiency evaluation of a floor standing air conditioner with different installation positions and air supply parameters applied to a large laboratory

Cited by 6 publications

References 35 publications

A Robust Construction Safety Performance Evaluation Framework for Workers’ Compensation Insurance: A Proposed Alternative to EMR

A Robust Construction Safety Performance Evaluation Framework for Workers’ Compensation Insurance: A Proposed Alternative to EMR

Study on the Recommended Placement and Air Distribution of Split Floor-Standing Room Air Conditioners

Numerical Study of the Effects of Evaporative Cooler Supply Air Outlet Height on Thermal Comfort

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