A combined analytical model for increasing the accuracy of heat emission predictions in rooms heated by radiators

Võsa, Karl-Villem; Ferrantelli, Andrea; Kurnitski, Jarek

doi:10.1016/j.jobe.2019.02.009

Cited by 21 publications

(5 citation statements)

References 15 publications

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“…New The internal gains value shown in Table 1 represents the weekly average load as the sum of occupant, equipment and lighting loads. Usage schedules for these loads are shown in Figure 3, while the thermal properties of envelope materials can be found in [9].…”

Section: Boundary Conditionmentioning

confidence: 99%

“…In these studies, dynamic simulations allowed assessing the performance of heating energy systems, although without a specific quantification of the emission losses. A model where this could be possible was recently proposed in [9], where an analytical calculation of the operative temperature in a European reference room allowed to quantify and compare the heat emission losses of different radiator types.…”

Section: Introductionmentioning

confidence: 99%

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A novel method for calculating heat emitter and controller configuration setpoint variations with EN15316-2

Võsa

Ferrantelli

Kurnitski

2020

Journal of Building Engineering

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Estimating heat emission losses of heating systems is an important task of energy efficiency assessments in buildings. To this aim, the present international standards contain tabulated values for different emitter and control system configurations, without however explaining how to compute the effect of increased setpoint temperatures on the system losses. Moreover, the effects of each component are treated as independent, while e.g. vertical stratification and temperature control of the system are cross-related.In this paper we attempt to fill this gap by proposing a calculation method to calculate the product category specific setpoint variations for space heating emitters, accounting for the overall heat balance in the enclosure and including the cross-correlations of each component as well.The emission losses of a heating system are computed using a temperature setpoint variation method that is imposed on annual energy calculations. This complements the procedure presented in the Standard EN15316-2, also providing the possibility to use product-specific values of setpoint variations instead of tabulated values. As the main finding of the study, the calculation process is defined for a European Reference Room, namely for a specific enclosure that allows an accurate and transparent evaluation of the total setpoint variation.The product-specific values of setpoint variations are calculated from measured vertical stratification and control parameters with an annual simulation model of the European Reference Room. The total setpoint variations were simulated for a set of heat emitters and controllers in order to quantify and compare the energy performance of a new and an old type building located in Strasbourg. We find that the total setpoint variation required to overcome emission losses is up to 2.00 °C in the old building and 1.20 °C in the new building, corresponding respectively to an increase in total heating energy usage of up to 22% and 20%.

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Section: Boundary Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel method for calculating heat emitter and controller configuration setpoint variations with EN15316-2

Võsa

Ferrantelli

Kurnitski

2020

Journal of Building Engineering

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“…The internal gains value shown in Table 1 represents the weekly average load as the sum of occupant, equipment and lighting loads. Usage schedules for these loads are shown in Figure 3, while the thermal properties of envelope materials can be found in [9].…”

Section: European Reference Roommentioning

confidence: 99%

A Novel Method for Calculating the Product Category Speciﬁc Setpoint Variations for Heat Emitters in EN15316-2

Võsa¹,

Ferrantelli²,

Kurnitski³

2019

Preprint

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Estimating heat emission losses of heating systems is an important task of energy efficiency assessments in buildings. To this aim, the present international standards contain tabulated values for different emitter and control system configurations, without however explaining how to compute the effect of increased setpoint temperatures on the system losses. Moreover, the effects of each component are treated as independent, while e.g. vertical stratification and temperature control of the system are cross-related. In this paper we attempt to fill this gap by proposing a calculation method to calculate the product category specific setpoint variations for space heating emitters, accounting for the overall heat balance in the enclosure and including the cross-correlations of each component as well. The emission losses of a heating system are computed using a temperature setpoint variation method that is imposed on annual energy calculations. This complements the procedure presented in the Standard EN15316-2, also providing the possibility to use product-specific values of setpoint variations instead of tabulated values. As the main finding of the study, the calculation process is defined for a European Reference Room, namely for a specific enclosure that allows an accurate and transparent evaluation of the total setpoint variation. The product-specific values of setpoint variations are calculated from measured vertical stratification and control parameters with an annual simulation model of the European Reference Room. The total setpoint variations were simulated for a set of heat emitters and controllers in order to quantify and compare the energy performance of a new and an old type building located in Strasbourg. We find that the total setpoint variation required to overcome emission losses is up to 2.00 °C in the old building and 1.20 °C in the new building, corresponding respectively to an increase in total heating energy usage of up to 22% and 20%.

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“…Moreover, an improvement in the average temperature of the floor surface and heat transfer rate of about 8.2% and 37.4%, respectively, is observed using the aluminum layer. Võsa et al 15 developed an analytical model for a room heated by a radiator which directly calculates the heat output needed to keep a specific operating temperature. In this study, the related annual energy consumption was assessed in different climates and different radiator types by conducting annual simulations in building with and without heat recovery.…”

Section: Introductionmentioning

confidence: 99%

Passive heating process enhancement of a new structure room using porous‐covering heat‐emitting channels

et al. 2023

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This manuscript presents a numerical study of a passive heating process of a new structure room using porous‐covering heat‐emitting channels as small discrete radiators. The governing equations are discretized using the finite volume method and the SIMPLER algorithm is employed to handle the pressure–velocity coupling. The effect of porous‐cover to air thermal conductivity ratio (Kr), Darcy number (Da), Rayleigh number (Ra), thickness of the porous‐cover (Ep), and Biot number (Bi) on the heating process of the room is examined. The principal results of this investigation indicate that in the case with Kr > 1, numerical simulations have enabled us to find an optimal value of Ep (Epcr = 0.125) for which the average room temperature reaches a maximum value. In addition, an enhancement in the heating process in the room can reach 77.77% by increasing Ep, Ra, Da, and Kr. Also, a maximum increase in the average room temperature up to 97.77% is achieved at better thermal insulation (Bi = 10).

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A combined analytical model for increasing the accuracy of heat emission predictions in rooms heated by radiators

Cited by 21 publications

References 15 publications

A novel method for calculating heat emitter and controller configuration setpoint variations with EN15316-2

A novel method for calculating heat emitter and controller configuration setpoint variations with EN15316-2

A Novel Method for Calculating the Product Category Speciﬁc Setpoint Variations for Heat Emitters in EN15316-2

Passive heating process enhancement of a new structure room using porous‐covering heat‐emitting channels

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