On the heat transfer coefficients between heated/cooled radiant floor and room

Cholewa, Tomasz; Rosiński, M.; Spik, Z.; Dudzińska, Marzenna R.; Siuta-Olcha, Alicja

doi:10.1016/j.enbuild.2013.07.065

Cited by 86 publications

(50 citation statements)

References 19 publications

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“…The lack of consideration of the incident solar radiation and other internal heat gain on cooled surfaces was observed in calculation models documented in the standards and in several models developed by researchers [17][18][19].…”

Section: Radiation Heat Transfermentioning

confidence: 99%

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New method for the design of radiant floor cooling systems with solar radiation

Feng

Schiavon

Bauman

2016

Energy and Buildings

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Impacts of solar shortwave radiation are not taken into account in the standardized design methods in the current radiant system design guidelines. Therefore, the current methods are not applicable for cases where incident solar is significant. The goals of this study are to: 1) use dynamic simulation tools to investigate the impacts of solar radiation on floor cooling capacity, and 2) develop a new simplified method to calculate radiant floor cooling capacity when direct solar radiation is present. We used EnergyPlus to assess the impacts of solar for different design conditions. The simulation results showed that the actual cooling capacities are in average 1.44 times higher than the values calculated with the ISO 11855 method, and 1.2 times higher than the ASHRAE method. A simplified regression model is developed to improve the predictability of ISO methods. The new model calculates the increased capacity as a function of the zone transmitted solar and the characteristic temperature difference between the hydronic loop and room operative temperature.

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Section: Radiation Heat Transfermentioning

confidence: 99%

“…First, calculate the K H, floor for floor heating systems using the correlations for system type A-D [19].…”

Section: Cooling Capacity Estimation Methodsmentioning

confidence: 99%

New method for the design of radiant floor cooling systems with solar radiation

Feng

Schiavon

Bauman

2016

Energy and Buildings

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“…All the following simulations were carried out throughout the month of January. The convective heat transfer coefficient of the floor heating system was set equal to 3.05 W/m 2¨K [26]. To calculate the radiative heat transfer, TRNSYS considers the emissivity of surfaces (0.9 in this study).…”

Section: Simulationmentioning

confidence: 99%

Thermal Energy Storage for Building Load Management: Application to Electrically Heated Floor

2016

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Abstract:In cold climates, electrical power demand for space conditioning becomes a critical issue for utility companies during certain periods of the day. Shifting a portion or all of it to off-peak periods can help reduce peak demand and reduce stress on the electrical grid. Sensible thermal energy storage (TES) systems, and particularly electrically heated floors (EHF), can store thermal energy in buildings during the off-peak periods and release it during the peak periods while maintaining occupants' thermal comfort. However, choosing the type of storage system and/or its configuration may be difficult. In this paper, the performance of an EHF for load management is studied. First, a methodology is developed to integrate EHF in TRNSYS program in order to investigate the impact of floor assembly on the EHF performance. Then, the thermal comfort (TC) of the night-running EHF is studied. Finally, indicators are defined, allowing the comparison of different EHF. Results show that an EHF is able to shift 84% of building loads to the night while maintaining acceptable TC in cold climate. Moreover, this system is able to provide savings for the customer and supplier if there is a significant difference between off-peak and peak period electricity prices.

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“…Most of the measurements were performed only at normal temperatures or they were not related to building physics. Using climatic chamber, K-type thermocouples, Pt 500 sensors, and infrared thermal imaging camera, Koca et al [6] and Cholewa et al [7] investigated the heat transfer coefficients of radiant heating systems of buildings. They analyzed the temperature range from 30 to 42 °C or 55 °C, respectively, which was appropriate to their objectives.…”

Section: Introductionmentioning

confidence: 99%

Determination of Radiative Heat Transfer Coefficient at High Temperatures Using a Combined Experimental-Computational Technique

Kočí

Korecký

et al. 2015

Measurement Science Review

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The radiative heat transfer coefficient at high temperatures is determined using a combination of experimental measurement and computational modeling. In the experimental part, cement mortar specimen is heated in a laboratory furnace to 600°C and the temperature field inside is recorded using built-in K-type thermocouples connected to a data logger. The measured temperatures are then used as input parameters in the three dimensional computational modeling whose objective is to find the best correlation between the measured and calculated data via four free parameters, namely the thermal conductivity of the specimen, effective thermal conductivity of thermal insulation, and heat transfer coefficients at normal and high temperatures. The optimization procedure which is performed using the genetic algorithms provides the value of the high-temperature radiative heat transfer coefficient of 3.64 W/(m 2 K).

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On the heat transfer coefficients between heated/cooled radiant floor and room

Cited by 86 publications

References 19 publications

New method for the design of radiant floor cooling systems with solar radiation

New method for the design of radiant floor cooling systems with solar radiation

Thermal Energy Storage for Building Load Management: Application to Electrically Heated Floor

Determination of Radiative Heat Transfer Coefficient at High Temperatures Using a Combined Experimental-Computational Technique

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