Experimental and numerical studies on the performance evaluation of a bed-based task/ambient air conditioning (TAC) system

Mei, Ning; Pan, Dongmei; Chan, Ming Yin Jonathan; Deng, Shiming

doi:10.1016/j.apenergy.2014.06.022

Cited by 37 publications

(3 citation statements)

References 12 publications

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“…For example, the application of the TAC system to sleeping environments in real buildings helps reduce energy consumption; however, the bulky air ducts and ventilation plenums of the TAC system may cause inconvenience to occupants [31]. Moreover, although the TAC system was improved by removing the air ducts [36][37][38], it might still cause a cold draft. Furthermore, during the application of the bedside PV system to sleepers, the ventilation time could be continuous for 7 h or more.…”

Section: Of 18mentioning

confidence: 99%

An Experimental Study on Human Thermal Comfort with Thermal-Conductive Bed during Sleep in Summer

Hu,

Hao,

Huang

et al. 2023

Buildings

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Sleep is vital for human health, while sleep quality is affected by indoor thermal environments. This study aims to investigate human thermal comfort with a thermal-conductive bed during sleep in summer. A series of experiments were conducted in a climatic chamber of a university. Subjects slept on a thermal-conductive bed, with or without the supply of water cooling them by flowing through the pipes embedded in the bed. The supply water was set at 20, 25, 28, and 30 °C. The indoor temperature was set at 32 °C. The bed surface temperature (back, buttock, thigh, and calf) and the subject’s skin temperature were measured. Questionnaires after waking up the next morning were conducted. The results show that when there was no water supply in the pipes of the thermal-conductive bed, the bed surface temperature was 0–1.5 °C higher than the indoor temperature, and subjects felt slightly warm. When the supply water temperature was 28 or 30 °C, subjects felt thermally comfortable during a night’s sleep. This study demonstrates that the proposed thermal-conductive bed with supply water temperatures of 28–30 °C can create a comfortable sleep environment for residents who have no air-conditioning systems in summer, which can also help save building energy.

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Section: Of 18mentioning

confidence: 99%

An Experimental Study on Human Thermal Comfort with Thermal-Conductive Bed during Sleep in Summer

Hu,

Hao,

Huang

et al. 2023

Buildings

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“…Their results showed that using the air distributor on the floor (UFAD), the temperature difference is less in the vertical direction and this method is more favorable for the comfort of the persons. Ning et al [4] examined the performance of an air conditioner for sleep mode. They examined the effect of the position of inlet and outlet vents on the performance of this system experimentally and numerically.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of the effect of air conditioning duct on the room temperature distribution and energy efficiency

Delavari

Ghassabi²,

Saffarian

2019

J Braz. Soc. Mech. Sci. Eng.

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One of the air conditioning problems of the buildings in winter is the collected hot air at the top of the room. This will increase energy consumption to warm the buildings. In this research, the effect of using a duct to transfer the hot air from top to bottom of a room is investigated numerically and experimentally. Experimental results are obtained by installing a duct with a height of 1.5 m, a width and a length of 0.11 m in a cubic room with the dimensions of 2.5 m. This duct has two fans, one at the top and the other at the bottom each with a power of 30 W. Numerical simulations are obtained by solving the equations of continuity, momentum and energy using Ansys Fluent 16. Results indicate that the air conditioning duct has improved energy efficiency coefficient from 0.43 to 1.05. It was also observed that the presence of the duct significantly uniformed the room temperature.

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“…11 Besides, a bed-based TAC system has been proposed in recent years. 12,13 Living chambers installed with bed-based TAC system perform competently in ventilation effect and energy saving. 14 As for floor-based TAC system, it has been validated that it can create adequate thermal comfort in workplace environment.…”

Section: Introductionmentioning

confidence: 99%

Working parameter selection and analysis of radiant floor cooling combined with desk-based task/ambient conditioning (TAC) system

Sun

Shuang

Lujie

2016

Building Services Engineering Research and Technology

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As a form of task/ambient conditioning (TAC) system, task ventilation is an effective way to control the micro environment of workplace. In response, we have proposed and investigated a radiant floor cooling combined with desk-based TAC system in order to accomplish complementary advantages of radiant floor system and TAC system. Up to now, very few studies on this system have been found in existing literatures. In this paper, appropriate working parameters of the system are examined by numerical simulation method. To improve simulation accuracy, experiments were simulated in reference by applying three turbulence models and two radiation models. It turned out that the standard k–ɛ model combined with Discrete Ordinates (DO) model boasts the best accuracy as is revealed by the comparison between simulated results with the experimental. On this basis, a simulation of an office adopting the system was performed. According to analysis of the influence of different radiant panel temperatures and air supply parameters of TAC system on the thermal environment based on calculated results, the appropriate working parameters that meet the thermal comfort requirements are obtained, which can be used as a reference for the design of the system. The TRNSYS software was employed to simulate the operation energy consumption of the composite system in the office building, and the design parameters of the comprehensive consideration of comfort and energy saving are put forward in the present study. Practical application: For the conference room applied a radiant floor cooling combined with TAC system, this paper analyzed the impact of floor surface temperatures, task air supply temperature and task air supply temperature to the occupants workplace’s thermal environment and energy consumption of the system, and obtained the design parameters which comprehensive considered comfort and energy consumption. The research results of this paper can provide guideline for the design and selection of the working parameters for the conference room applied a radiant floor cooling combined with TAC system.

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Experimental and numerical studies on the performance evaluation of a bed-based task/ambient air conditioning (TAC) system

Cited by 37 publications

References 12 publications

An Experimental Study on Human Thermal Comfort with Thermal-Conductive Bed during Sleep in Summer

An Experimental Study on Human Thermal Comfort with Thermal-Conductive Bed during Sleep in Summer

Numerical and experimental investigation of the effect of air conditioning duct on the room temperature distribution and energy efficiency

Working parameter selection and analysis of radiant floor cooling combined with desk-based task/ambient conditioning (TAC) system

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