Energy analysis of a hybrid radiant cooling system under hot and humid climates: A case study at Shanghai in China

Kim, Moon Keun; Liu, Jiying; Cao, Shi-Jie

doi:10.1016/j.buildenv.2018.04.006

Cited by 59 publications

(36 citation statements)

References 32 publications

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“…However, recently, hybrid radiant cooling system has been designed to reduce moisture condensation risks and also to improve cooling output with enhanced mixed convection effect by Airbox convector. [6][7][8][9] Therefore, when compared with radiant ceiling cooling systems, 10,11 which are mostly applied in hot and humid climates, 9 radiant floor cooling systems only appear in a limited number of studies due to the potential contradictions of maintaining sufficient cooling capacity as well as preventing the condensation and local discomfort caused by lower floor temperatures and larger vertical temperature differences. 12 Furthermore, radiant floor systems were mainly investigated for their potential use in heating applications in cold climates, for instance in northern China.…”

Section: Introductionmentioning

confidence: 99%

A comparison of the thermal comfort performances of a radiation floor cooling system when combined with a range of ventilation systems

Liu

Kim

et al. 2019

Indoor and Built Environment

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This study conducted a series of computational fluid dynamics simulations to evaluate the thermal comfort performance of a radiant floor cooling system when combined with different ventilation systems, including mixed ventilation (MV), stratum ventilation (SV), displacement ventilation (DV) and ductless personalized ventilation (DPV). A window temperature of 32°C and three different floor temperatures including 20, 22 and 24°C were set in summer. We used the vertical air temperature differences (VATD) at ankle and head level, the percentage of dissatisfied, the draught rate at the ankle level and the equivalent temperature as our main evaluation indices. Our results show that the VATD in DV system can reach up to about 5°C, compared with about 2°C in MV and SV systems. For the DPV system, there is only a marginal drop in the VATD. For the DV and DPV cases, with a rate of air changes per hour (ACH) of 2.4−1, we recorded a higher draught rate at the ankle level, ranging from 6.55% to 9.99%. The lower equivalent temperature values for the foot and calf segments occur when the floor temperature is 20°C. In all cases, the equivalent temperature values of the whole body indicate an acceptable level of thermal discomfort.

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Section: Introductionmentioning

confidence: 99%

A comparison of the thermal comfort performances of a radiation floor cooling system when combined with a range of ventilation systems

Liu

Kim

et al. 2019

Indoor and Built Environment

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“…In the last two decades, numerous cities face serious problems of rapid urbanization [1,2], energy consumption [3][4][5][6][7], and climate change [8,9]. It is estimated more than 70% of people will reside in the built environment by 2050.…”

Section: Introductionmentioning

confidence: 99%

Quantifying Impacts of Urban Microclimate on a Building Energy Consumption—A Case Study

et al. 2019

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This paper considered an actual neighborhood to quantify impacts of the local urban microclimate on energy consumption for an academic building in College Park, USA. Specifically, this study accounted for solar irradiances on building and ground surfaces to evaluate impacts of the local convective heat transfer coefficient (CHTC), infiltration rate, and coefficient of performance (COP) on building cooling systems. Using computational fluid dynamics (CFD) allowed for the calculation of local temperature and velocity values and implementation of the local variables in the building energy simulation (BES) model. The discrepancies among the cases with different CHTCs showed slight influence of CHTCs on sensible load, in which the maximum variations existed 1.95% for sensible cooling load and 3.82% for sensible heating load. The COP analyses indicated windward wall and upstream roof are the best locations for the installation of these cooling systems. This study used adjusted infiltration rate values that take into account the local temperature and velocity. The results indicated the annual cooling and heating energy increased by 2.67% and decreased by 2.18%, respectively.

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“…Khan et al examined the performance of radiant air‐conditioning system using desiccant aided dedicated outdoor air system ( DOAS ) and suggested the required parameters in order to achieve energy efficient air‐conditioning system than the conventional system. Kim et al studied the performance of hybrid radiant cooling system with decentralized air convectors and reported less energy consumption in comparison with the conventionally used air‐conditioner. Wojtkowiak et al developed a unique kind of ceiling panel for radiant cooling system to improve the performance capacity from 26‐55% with respect to the reference panels.…”

Section: Introductionmentioning

confidence: 99%

Comparative assessment of different air‐conditioning systems for nearly/net zero‐energy buildings

Singh

Das

2020

Int J Energy Res

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Summary This study deals with the performance of different air‐conditioning strategies for achieving the target of nearly/net zero energy in a medium‐scale building under various environmental conditions. In particular, vapour compression (VC), vapour absorption (VA), and integration of radiant cooling technology are analysed using renewable energy resources and solar photovoltaic (PV)‐based electricity. Four different kinds of air‐conditioning configurations are considered: VC‐based, VA‐based, VC‐radiant air‐conditioning technology with VC dedicated outdoor air system (DOAS) and VA radiant air‐conditioning technology with VC‐DOAS. Numerical model validations with the benchmark standards are done for VC‐ and VA‐based systems. In particular, annual electric consumption, electricity generation, thermal load generation among all configurations, emissions and solar fractions are studied. The present study shows that target of nearly/net zero‐energy building can be achieved in an efficient manner through radiant VC‐based system with VC‐DOAS for hot‐dry and composite (ie, hot‐dry with higher humidity) environment conditions. However, for warm‐humid environment, complete net zero is not possible, but up to 74% of net zero target can be assured with VC‐based radiant and DOAS. With respect to the conventional VC‐based system, the payback period assessment for the most suitable nearly/net zero building cooling system varies in the range of 5‐9 years, depending on the environmental conditions.

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Energy analysis of a hybrid radiant cooling system under hot and humid climates: A case study at Shanghai in China

Cited by 59 publications

References 32 publications

A comparison of the thermal comfort performances of a radiation floor cooling system when combined with a range of ventilation systems

A comparison of the thermal comfort performances of a radiation floor cooling system when combined with a range of ventilation systems

Quantifying Impacts of Urban Microclimate on a Building Energy Consumption—A Case Study

Comparative assessment of different air‐conditioning systems for nearly/net zero‐energy buildings

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