Modelling of global solar irradiance on sloped surfaces in climatic conditions of Kraków

Michalak, Piotr

doi:10.2478/ntpe-2019-0054

Cited by 3 publications

(5 citation statements)

References 16 publications

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“…Performed calculations revealed differences in the annual heating demand between two methods and confirmed its dependence on the aforementioned factors. In addition, previous works [2,31] indicated strong impact of the new PN-EN ISO 52010 standard on calculated solar gains in buildings, comparing to the method used so far, influencing values of heating and cooling demand without any physical changes in the building's structure. This is a premise for a detailed study about the calculation procedures used in the energy calculations of buildings.…”

Section: Discussionmentioning

confidence: 99%

“…The thermal capacity of the building, Cm, was obtained from physical properties of materials using simple method from PN-EN ISO 13786 [25]. Additional data were given in [2].…”

Section: Buildingmentioning

confidence: 99%

“…Poland is the country with heating dominated climate [1][2][3]. Thus, energy use for space heating has significant share in total energy consumption in Polish buildings.…”

Section: Introductionmentioning

confidence: 99%

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Ventilation heat loss in a multifamily building under varying air density

Michalak

2020

Journal of Mechanical and Energy Engineering

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Standards related to calculation methods used in building energy performance simulation tools usually impose constant volumetric heat capacity of air. However, this simplification may result in errors if the actual conditions differ from the assumptions made. The paper presents the problem of dry air density and specific heat capacity variation and their influence on calculated energy use for space heating in a multifamily building. The monthly calculation method of PN-EN ISO 13790 was used. Simulations were performed in five cities, each in one climatic zone according to PN-EN 12831. Variation of the air density caused by air temperature and elevation resulted in differences in calculated heating demand from-4.5% to 4.5% in relation to that at constant volumetric heat capacity assumed in PN-EN ISO 13790.

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Section: Discussionmentioning

confidence: 99%

“…The thermal capacity of the building, Cm, was obtained from physical properties of materials using simple method from PN-EN ISO 13786 [25]. Additional data were given in [2].…”

Section: Buildingmentioning

confidence: 99%

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Ventilation heat loss in a multifamily building under varying air density

Michalak

2020

Journal of Mechanical and Energy Engineering

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“…In [32], solar irradiance on an envelope of a multifamily building in Kraków (south Poland) was computed by five models (Hay, Muneer, Reindl, Perez, and EN ISO 52010-1). The differences in annual heating demands, calculated using the monthly method of EN ISO 13790 related to the TMY, were up to 10%.…”

Section: Literature Reviewmentioning

confidence: 99%

Modelling of Solar Irradiance Incident on Building Envelopes in Polish Climatic Conditions: The Impact on Energy Performance Indicators of Residential Buildings

Michalak¹

2021

Energies

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In this study, we use the data of Polish typical meteorological years and 15 transposition models to obtain global solar irradiance on sloped surfaces to calculate solar irradiance on external building partitions, solar gains, heating demands, and primary nonrenewable energy for heating and domestic hot water (EPH+W) of two typical Polish residential buildings, each for two variants in five locations. In relation to TMYs, annual solar gains were lower by −31% and −36% on average in a single and multifamily building, respectively, and the annual heating demands increased by 9% and 16%, respectively. Consequently, averaged EPH+W in relation to TMYs rose by 1.4 kWh/m2 and 4.5 kWh/m2, respectively. The mean differences between TMYs and the new method from the recently published EN-ISO 52010 standard for test Building 1 were 1.6 and 1.2 kWh/m2, for Variants 1 and 2, respectively. Similarly, for test Building 2, the mean differences were 5.1 kWh/m2 and 3.9 kWh/m2, respectively. This means that the simulation model that is chosen has a visible impact on a building’s energy performance indicators and its rating without any changes in the physical structure and use of the building.

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“…Solar heat gains were determined according to [16]. Hourly solar irradiance incident on vertical surfaces was computed applying the Perez model [65].…”

Section: Introductionmentioning

confidence: 99%

Thermal - electrical analogy in dynamic simulations of buildings: Comparison of four numerical solution methods

Michalak

2020

Journal of Mechanical and Energy Engineering

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The lumped capacitance method is widely used in dynamic modelling of buildings. Models differ in complexity, solution methods and ability to simulate transient behaviour of described objects. The paper presents a mathematical description of a simple 1R1C thermal network model of a building zone. Four numerical methods were applied to solve differential equation describing its dynamics. For validation purposes two test cases (600 and 900) from the BESTEST procedure were used. In both cases detailed results were given. Better ability of the simulation model to reproduce transient behaviour of the modelled buildings was noticed in case of the lightweight object (case 600). Annual heating and cooling demand was within the reference range for heavyweight one (case 900). The kind of the computation method had no significant effect on simulation results.

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Modelling of global solar irradiance on sloped surfaces in climatic conditions of Kraków

Cited by 3 publications

References 16 publications

Ventilation heat loss in a multifamily building under varying air density

Ventilation heat loss in a multifamily building under varying air density

Modelling of Solar Irradiance Incident on Building Envelopes in Polish Climatic Conditions: The Impact on Energy Performance Indicators of Residential Buildings

Thermal - electrical analogy in dynamic simulations of buildings: Comparison of four numerical solution methods

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