Parametric analysis of solar hot water production in &amp;#x201C;commi-block&amp;#x201D; buildings

Horváth, Miklós; Hrabovszky-Horváth, Sára; Csoknyai, Tamás

doi:10.1109/iyce.2015.7180769

Cited by 1 publication

(2 citation statements)

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“…Similar losses have also been shown by Gassel [3] and Zhang et al [5]. Horvath et al [4] showed a slightly lower DHW system heat loss of between 5.7 and 9.9 kWh/(m 2 •a). Our calculations showed that 5.5 kWh/(m 2 •a) is the minimum loss in apartment buildings.…”

Section: Discussionsupporting

confidence: 80%

“…Gassel [3] showed that if the DHW circulation is constantly in operation, this equates to 15 kWh/m 2 •a energy consumption, the circulation share being 19% of total DHW heating demand. Horvath et.al [4] showed that when the specific DHW annual heat demand is between 23.2 and 32.2 kWh/(m 2 •a), the distribution and circulation losses are between 5.7 and 9.9 kWh/(m 2 •a). Zhang et al [5] indicated that recirculation loop pipes heat loss represented about one third of a system's fuel energy consumption and the average overall system efficiency was only about 34%.…”

Section: Introductionmentioning

confidence: 99%

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Heat Loss Due to Domestic Hot Water Pipes

et al. 2021

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Domestic hot water (DHW) system energy losses are an important part of energy consumption in newly built or in reconstructed apartment buildings. To reach nZEB or low energy building targets (renovation cases) we should take these losses into account during the design phase. These losses depend on room and water temperature, insulation and length of pipes and water circulation strategy. The target of our study is to develop a method which can be used in the early stages of design in primary energy calculations. We are also interested in how much of these losses cannot be utilised as internal heat gain and how much heat loss depends on the level of energy performance of the building. We used detailed DHW system heat loss measurements and simulations from an nZEB apartment building and annual heat loss data from a total of 22 apartment buildings. Our study showed that EN 15316-3 standard equations for pipe length give more than a twice the pipe length in basements. We recommend that for pipe length calculation in basements, a calculation based on the building’s gross area should be used and for pipe length in vertical shafts, a building’s heating area-based calculation should be used. Our study also showed that up to 33% of pipe heat losses can be utilised as internal heat gain in energy renovated apartment buildings but in unheated basements this figure drops to 30% and in shafts rises to 40% for an average loss (thermal pipe insulation thickness 40 mm) of 10.8 W/m and 5.1 W/m. Unutilised delivered energy loss from DHW systems in smaller apartment buildings can be up to 12.1 kWh/(m2·a) and in bigger apartment buildings not less than 5.5 kWh/(m2·a) (40 mm thermal pipe insulation).

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Section: Discussionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%