A 50 year review of basic and applied research in radiant heating and cooling systems for the built environment

Rhee, Kyu-Nam; Kim, Kwang Woo

doi:10.1016/j.buildenv.2015.03.040

Cited by 370 publications

(134 citation statements)

References 131 publications

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“…The radiant low temperature heating and high temperature cooling systems (floor, ceiling, and wall heating or cooling) perform better than other room conditioning systems in terms of providing a thermally comfortable indoor environment due to their advantages of minimizing the risk of unpleasant air movement, and of creating a uniform thermal indoor environment [37], [38].…”

mentioning

confidence: 99%

Exergy performance of different space heating systems: A theoretical study

Kazanci

Shukuya

Olesen

2016

Building and Environment

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Three space heating systems (floor heating with different floor covering resistances, radiator heating with different working temperatures, warm-air heating with and without heat recovery) were compared using a natural gas fired condensing boiler as the heat source. For the floor heating systems, the effects of floor covering resistance on the whole system performance were studied using two heat sources; a natural gas fired condensing boiler and an air-source heat pump. The heating systems were also compared in terms of auxiliary exergy use for pumps and fans.The low temperature floor heating system performed better than other systems in terms of exergy demand. The use of boiler as a heat source for a low-exergy floor heating system creates a mismatch in the exergy supply and demand. Although an air-source heat pump could be a better heat source, this depends on the origin of the M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT2 electricity supplied to the heat pump. The coefficient of performance (COP) of the heat pump has a critical value (2.57 in this study); it is beneficial to use a heat pump instead of a boiler only when the COP is above this critical value.The floor covering resistance should be kept to a minimum, in order not to hinder the performance of the floor heating and the whole system. The exergy input to auxiliary components plays a significant role in the overall exergy performance of systems, and its effects become even more significant for low temperature heating systems.

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confidence: 99%

Exergy performance of different space heating systems: A theoretical study

Kazanci

Shukuya

Olesen

2016

Building and Environment

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“…Conventional air conditioning systems were all-air systems that controlled the indoor air temperature using convective heat transfer. However, with increasing concerns about energy conservation, the recent trend is to utilize radiant heating and cooling systems that can improve the thermal comfort with higher mean radiant temperature for heating and lower mean radiant temperature for cooling [1,2]. Since these systems provide better thermal comfort, the acceptable comfort range of indoor air temperature may be increased and higher and lower setpoint temperatures might be used for cooling and heating, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…A small change in room temperature will cause significant amount of radiant and convective heat exchange between the room and the system because the TABS has large area of radiant surface exposed to the room [9,11]. The concept can be explained with the following equation: (1) where q is the heat exchange between room and the system, hconv+rad is heat transfer coefficient of convection and radiation, Area is a surface area of the TABS exposed to the room, and TTABS is the system surface temperature and Ti is the indoor air temperature.…”

Section: Introductionmentioning

confidence: 99%

Control of Thermally Activated Building System Considering Zone Load Characteristics

Chung

Park²,

Yeo

et al. 2017

Sustainability

Self Cite

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Abstract:The objectives of this study were to investigate the thermally activated building system (TABS) mechanism for appropriate use of the system and to apply the proper concept of TABS for each zone by using different TABS control strategies. In order to examine the TABS mechanism, dynamic simulation with EnergyPlus was used to model the office building with TABS, because the radiant heat exchange characteristics of the TABS according to the time variable was critical. The typical control concept of TABS, self-regulation, was applied in the simulation by setting the supply water temperature as room setpoint temperature. As a result, the advantage of self-regulation can be amplified by utilizing the entire thermal mass of the TABS, which can be executed by customizing to target a specific type of load. Since the large area of the office building may comprise different loads in different zones, the TABS control according to the different zone loads were proposed. By separating the control strategy from zone to zone, the proposed control strategy improved the thermal comfort by 5%, reduced peak heating load by 10%, reduced cooling load by 36%, and decrease the total energy consumption by 13%. This study demonstrated a possible improvement on self-regulation of TABS with separate zone controls.

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“…The draft rate separates the applicability of the standard into three steps and suggests an acceptable percentage of people who feel discomfort caused by a draft. The draft rate can be calculated as shown in Equation (1). DR = {(34 − t a ) × (v − 0.05) 0.62 } × {(0.37 × v × Tu) + 3.14)}…”

Section: Downdraft Assessment Criteriamentioning

confidence: 99%

“…The demand for efficient use of interior space is also increasing. Consequently, interest in radiant heating systems has increased and applications of this technology are becoming more widespread [1].…”

Section: Introductionmentioning

confidence: 99%

Downdraft Assessment of Glass Curtain Wall Buildings with a Radiant Floor Heating System

et al. 2017

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Abstract:The present study aims to evaluate whether downdraft can be prevented by applying a radiant floor heating system in glass curtain wall buildings. A radiant floor heating system does not directly supply heat to cold air, but does so via heat exchange with a cold airflow. Assessing whether a downdraft is prevented is, thus, necessary. For this assessment, a radiant floor heating system was applied to perimeter zones with different window types modeled using a computational fluid dynamics (CFD) simulation. The relationship between the radiant floor heating system and the windows was examined via an assessment of the resulting downdraft by considering the radiant heat exchange effect between the window and the floor. The assessment was conducted by utilizing a CFD simulation. The simulation results show that the temperature difference between the air supplied through the radiant floor heating system and the air descending along the cold surface of the window increased when the radiant floor heating system was applied to a narrow area with a high temperature. Furthermore, the airflow velocity increased with the heat exchange. The airflow re-entered the window side, and the downdraft in the occupied area exceeded the strict value specified by the standards. Conversely, if heat were applied according to the indoor thermal output by widening the radiant heat area of the radiant floor heating system, a downdraft could occur as a result of a blocking failure prior to the influx of the cold air into the occupied area caused by low surface temperatures. Therefore, applying a radiant floor heating system is advantageous in a perimeter zone without causing airflow inducement at the window side with acceptable surface temperatures.

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A 50 year review of basic and applied research in radiant heating and cooling systems for the built environment

Cited by 370 publications

References 131 publications

Exergy performance of different space heating systems: A theoretical study

Exergy performance of different space heating systems: A theoretical study

Control of Thermally Activated Building System Considering Zone Load Characteristics

Downdraft Assessment of Glass Curtain Wall Buildings with a Radiant Floor Heating System

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