Experimental study on control strategies of radiant floor cooling system with direct-ground cooling source and displacement ventilation system: A case study in an office building

Ren, Jun; Liu, Jiying; Zhou, Shiyu; Kim, Moon Keun; Song, Shoujie

doi:10.1016/j.energy.2021.122410

Cited by 30 publications

(9 citation statements)

References 49 publications

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“…(2) Pollutant exposure reduction index Gao and Niu 73 investigated the microenvironment around the human body with and without a personalized ventilation system using a sitting thermal manikin with a realistic human geometry. They introduced a new evaluation index, the pollutant exposure reduction index η PER , which is the percentage of pollutant concentration reduction in indoor air, as defined in equation (2). In their numerical simulation, the pollutant exposure reduction (PER) in the air was 74%, and the exhalation strongly affected the PER when the personalized airflow speed was low…”

Section: Evaluation Indicesmentioning

confidence: 99%

“…Reducing the energy consumption of buildings has therefore become an urgent need for society. 1,2 Traditional heating, ventilation and air conditioning (HVAC) systems of buildings are mostly designed to provide a uniform thermal environment for the whole space. [3][4][5] Conditioning the indoor environment of unoccupied spaces causes unnecessary energy use.…”

Section: Introductionmentioning

confidence: 99%

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A review of human thermal plume and its influence on the inhalation exposure to particulate matter

Zong

Liu

et al. 2022

Indoor and Built Environment

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This paper reviews studies on the human thermal plume and its influence on the inhalation exposure to particulate matter in the breathing zone under different conditions. The human thermal plume transports particle pollutants from the floor to the breathing zone, increasing the inhaled particulate matter concentration. The concentration can be four times higher than that in the ambient environment. Studies have reported that the human thermal plume may prevent particulate matter from entering the breathing zone under specific conditions. Indoor airflow patterns significantly affect the dispersion of pollutants, especially in rooms equipped with displacement ventilation at low airflow velocities. It has been shown that the particle concentration is two times lower in the breathing zone of a rotating manikin than a static manikin. Understanding the characteristics and influencing factors of the human thermal plume is crucial to formulate measures to mitigate the inhalation exposure to particulate matter, achieve independent and personalized control of the human microenvironment, and create a healthy, intelligent and energy-saving indoor environment.

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Section: Evaluation Indicesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A review of human thermal plume and its influence on the inhalation exposure to particulate matter

Zong

Liu

et al. 2022

Indoor and Built Environment

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“…Although some relevant studies have been conducted on the combination of RFC and DV systems, most have focused on indoor thermal comfort. [30][31][32] The research on the pre-dehumidification of this composite system based on CFD modelling is limited. While experimental studies are reliable, they are characterized by the disadvantages of a high consumption of time, manpower and financial resources.…”

Section: Introductionmentioning

confidence: 99%

Dynamic prediction of the pre-dehumidification of a radiant floor cooling and displacement ventilation system based on computational fluid dynamics and a back-propagation neural network: A case study of an office room

Liu

Zhou

et al. 2022

Indoor and Built Environment

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This study was carried out to solve the problem of condensation in radiant floor cooling systems. Computational fluid dynamics simulation and back-propagation neural network prediction were employed to conduct thorough research to predict the effects of the displacement ventilation dehumidification phase in an office building located in Jinan, China. The effects of the air supply temperature ( T as), air supply flow rate ( V as), air supply humidity ratio ( H as), floor temperature ( T floor), initial indoor temperature ( T ini) and relative humidity ( H ini) on the duration and energy consumption of pre-dehumidification were investigated. The big data show the air dew point temperature ( T ad) produced the most significant effect on the pre-dehumidification duration and energy consumption, while T as would cause the least significant effect. With the decrease of T ad, the pre-dehumidification duration and energy consumption were, respectively, decreased by 59.1% and 44.2%. Furthermore, with the variation of V as, the energy consumption exhibited a fluctuating trend. This study provides a novel and effective method to assess the pre-dehumidification control of radiant floor surfaces by considering different initial indoor conditions and air supply parameters.

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“…With respect to RFS control strategies for improving indoor comfort and energy efficiency, Ren et al [43] investigated the operational control of radiant floor cooling, considering several factors (including condensation risk [44,45], achieving dynamic optimal control of the radiant cooling system.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation of a Radiant Floor System: The Impact of Different Screed Mortars and Floor Finishings

et al. 2022

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The radiant floor system market is growing rapidly because Europe is moving toward a low-carbon economy and increased awareness about environmental sustainability and energy efficiency, stimulated by the ambitious EU Energy Efficient Directive and nZEB challenge. The high growth rate of the market share is due to the involvement of homeowners in the specifications of their living commodities, so they are thus willing to invest more at the initial stage to obtain long-term benefits and lower energy exploration costs. We performed an experimental campaign over three slabs with a hydronic radiant floor system of equal dimensions, shape, and pipe pitch with different screed mortar formulations to assess their performance throughout a heating/cooling cycle. The temperature at different heights within the interior of the screed mortars and at the surface were monitored. The results revealed that an improved screed mortar has a relevant impact on the efficiency of the system. Moreover, a three-dimensional transient heat transfer model was validated using the experimental data. The model was used to evaluate the impact of different finishing materials, namely wood, cork, ceramic, and linoleum, on the floor surface temperatures. The results showed differences of 15% in the surface temperature when using different floor finishing solutions.

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Experimental study on control strategies of radiant floor cooling system with direct-ground cooling source and displacement ventilation system: A case study in an office building

Cited by 30 publications

References 49 publications

A review of human thermal plume and its influence on the inhalation exposure to particulate matter

A review of human thermal plume and its influence on the inhalation exposure to particulate matter

Dynamic prediction of the pre-dehumidification of a radiant floor cooling and displacement ventilation system based on computational fluid dynamics and a back-propagation neural network: A case study of an office room

Experimental and Numerical Simulation of a Radiant Floor System: The Impact of Different Screed Mortars and Floor Finishings

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