Hot domestic water consumption profile of multiapartment building and its dependency on external conditions
2020
Selegovskis, R., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Berzins, J., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Visockis, E., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)
In order to precisely model the heat consumption of a multiapartment building, not only parameters like area of a building and its thermal properties, location, occupation and etc. are important, but also what kind of Hot Domestic Water (HDW) preparation and circulation system is installed and its condition. This can be critical to accurately determine building heat consumption, because energy needed for space heating has a seasonal trend depending on environmental conditions, but the energy needed for HDW preparation and circulation depends on other circumstances. In modelling multiapartment building heat consumption, energy needed for the HDW system is usually set constant or recalculated by hourly water consumption at best. This can give false data that may result in poorly chosen elements of the system and excess heat consumption. To get more precise data not only time of day, but also seasonal parameters need to be taken into consideration, since heat loses in the HDW circulation system emit energy that is transferred to space heating, but this is dependent on the outside temperature. Also, the inlet cold water temperature changes due to the outside temperature and energy to rise its temperature to needed setpoint of HDW is higher. This paper analyses the heat consumption of numerous multiple apartment buildings, determines the consumption profile and its relationship with outside temperature. Determined profiles can be used to calculate and model building heat consumption and performance.
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