Performance analysis on a residential radiant chilled ceiling system and evaluation on indoor thermal environment in summer: an application

Sui, Xuemin; Zhang, Xu; Han, Xing

doi:10.1177/0143624412442512

Cited by 8 publications

(10 citation statements)

References 10 publications

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Section: Improved Combinations Of Parameters and New Thermal Comfort mentioning

confidence: 99%

“…To study the thermal environment characteristics of radiant cooled residential building, a lot of field measurements have been conducted. 19,27 The residential building tested is a three-layer linking row villa located in Shanghai City. The testing period was 20 August 2008 to September 2015, during which the outdoor temperature was 17-34 C. The layout of the measured building, the thermal properties of building envelopes, the tested radiant cooling system, the measurement equipment, and methodology have been elaborated in Sui et al 19 Figure 5 shows the test data on indoor thermal environment at 11:00-13:00 on 11 September 2008, which shows the relative relationship of the various parameters such as outdoor air temperature, indoor air temperature, interior wall surface temperatures, and mean radiant temperature.…”

Section: Improved Combinations Of Parameters and New Thermal Comfort mentioning

confidence: 99%

“…In view of the above problems, the authors and their research team conducted a lot of studies on residential temperature-humidity separate control air-conditioners. [16][17][18][19][20][21] These airconditioners used air source heat pump as the hot and cold sources, used radiant floor for heating in winter, used radiant ceiling for cooling in summer, and also employed outdoor air supply system to meet both indoor health requirements and dehumidification needs.…”

Section: Introductionmentioning

confidence: 99%

“…But this idea can not be used for radiant cooling systems, because indoor air temperature is not equal to mean radiant temperature in radiant cooled environment. Xuemin Sui et al 19,27 took a large number of field measurements on the practical application of radiant cooling systems in residential buildings and evaluated the indoor thermal environment. The field measurement data showed that the mean radiant temperature was about 3 C lower than the air temperature.…”

Section: Introductionmentioning

confidence: 99%

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Analysis on combinations of indoor thermal microclimate parameters in radiant cooled residential buildings and drawing of new thermal comfort charts

Sui

Zhang

2015

Building Services Engineering Research and Technology

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This paper proposed to discuss some issues about indoor microclimate parameters design in radiant cooled residential buildings. Based on the thermal comfort model, the relationships between low mean radiant temperature and other thermal microclimate parameters such as indoor air temperature, air velocity, and relative humidity were analyzed. The improved and reasonable combinations of four thermal microclimate parameters including radiant cooling surface temperature, air temperature, air velocity, and relative humidity were further derived. Furthermore, a number of new thermal comfort charts using radiant cooling surface temperature and air temperature as dominant parameters were drawn. The results show that the air temperature can be increased 1–3℃ within the recommended thermal comfort range when the mean radiant temperature is reduced 3℃. Under the design goal of thermal neutral, when the chilled ceiling surface temperature is in the range of 16–26℃, the air temperature should be set at 25.3–29.3℃; when the chilled floor surface temperature is in the range of 19–26℃, the air temperature should be set at 25.8–29.2℃. The design values of air velocity and relative humidity are not recommended to be changed, and still can follow the design standards for conventional all-air systems. Practical application: In this paper, some issues about indoor microclimate parameters design in radiant cooled buildings were discussed. A number of new thermal comfort charts using radiant cooling surface temperature and air temperature as dominant parameters were provided, and the design values of indoor air temperature, mean radiant temperature, air velocity, and relative humidity for radiant cooling system in residential buildings were also suggested. The research results can provide a more intuitive reference for the design of radiant cooling systems in residential buildings.

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Section: Improved Combinations Of Parameters and New Thermal Comfort mentioning

confidence: 99%

Section: Improved Combinations Of Parameters and New Thermal Comfort mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis on combinations of indoor thermal microclimate parameters in radiant cooled residential buildings and drawing of new thermal comfort charts

Sui

Zhang

2015

Building Services Engineering Research and Technology

Self Cite

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“…According to the statistical data, nearly 47% of building energy was consumed by space heating and cooling in the U.S. 1 During the last two decades, considerable efforts have been made to enhance the energy performance of buildings and building HVAC systems. 2–10…”

Section: Introductionmentioning

confidence: 99%

A model-based adaptive method for evaluating the energy impact of low delta-T syndrome in complex HVAC systems using support vector regression

Gao

Wang

Gang

et al. 2016

Building Services Engineering Research and Technology

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Low delta-T syndrome refers to the situation where the measured differential temperature of the overall terminal air-handling units is much lower than the normal value expected. It widely exists in the existing heating, ventilating, and air-conditioning systems and results in increased energy consumption. This paper presents a model-based method to evaluate the energy impact on the chilled water pumps due to the low delta-T syndrome in a complex chilled water system. When the low delta-T syndrome occurs, the chilled water pumps would deviate from their normal working conditions with increased power consumption. Models are developed to predict the reference benchmarks of the chilled water pump power based on the current cooling load, control rules, and preset set-points. The energy impact on the chilled water pumps can be determined by comparing the measured current pump power with the predicted benchmark. Support vector regression method is introduced for predicting the chilled water flow rate of the overall terminal units. Adaptive concept is employed to enhance the prediction accuracy of the overall pressure drop of the hydraulic water network under various working conditions. The proposed method is tested and validated in a dynamic simulation platform built based on a real complex heating, ventilating, and air-conditioning system. Results show that the proposed method can accurately evaluate the impact of the low delta-T syndrome on energy consumption of the chilled water pumps. Practical application: Low delta-T syndrome widely exists in existing HVAC systems and results in increased energy consumption. This paper presents a model-based method for practical applications in assessing the energy impact on the chilled water pumps due to the low delta-T syndrome in a complex chilled water system. When the low delta-T syndrome occurs in a system, this method can be used to predict the reference benchmark of energy use of chilled water pumps based on the measured cooling load profiles, the control rules used, and the preset set-points. The energy impact can be determined by comparing the measured actual energy consumption with the predicted benchmark. The evaluation results could help the operators to conveniently monitor the energy performance of the chilled water distribution system as well as to judge whether or not taking measures to identify and correct the related faults that result in the low delta-T syndrome.

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A novel refrigerant-direct radiant cooling system: Numerical simulation-based evaluation

Jiang

You

et al. 2021

Applied Thermal Engineering

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Performance analysis on a residential radiant chilled ceiling system and evaluation on indoor thermal environment in summer: an application

Cited by 8 publications

References 10 publications

Analysis on combinations of indoor thermal microclimate parameters in radiant cooled residential buildings and drawing of new thermal comfort charts

Analysis on combinations of indoor thermal microclimate parameters in radiant cooled residential buildings and drawing of new thermal comfort charts

A model-based adaptive method for evaluating the energy impact of low delta-T syndrome in complex HVAC systems using support vector regression

A novel refrigerant-direct radiant cooling system: Numerical simulation-based evaluation

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