Determination of the seasonal heat consumption based on the short-term measurements in the building

Abstract

The article presents the balance approach of determining the building heat consumption (for heating and ventilation purposes) in the standard heating season based on short-term measurements performed on the real object in actual climatic conditions. The influence of the length of measurements in situ on the accuracy of estimation of the seasonal heat consumption was analysed for the occupied building. The 14-day measurement period was examined as the shortest and it was proved that the accuracy of the heat consumption forecasting was in that case ±20%. The heat consumption for heating and ventilation purposes, determined on the basis of short-term measurements, was recalculated to the reference climatic conditions of the heating season. Such a value is one of the components of the energy performance of a building. According to the Directive of the European Parliament and of the Council on the energy performance of buildings, measurement-based approaches are the alternative for the computational approaches and thus the proposed method can find a practical application in the process of energy certification of buildings. In this article, the results of the application of this method in the multifamily building occupied during the measurements are also presented.

Case Study of Thermal Diagnostics of Single-Family House in Temperate Climate

“…The heat consumption for heating and ventilation purposes in the standard heating season was calculated using the method based on the heat balance of the building presented in [30]. This method involves the forecasting of the heat consumption for heating and ventilation purposes in the standard heating season based on short-term measurements (lasting minimum 14 days) during the actual season.…”

“…Then, we can evaluate the heat flow rate for heating and ventilation for the standard heating season (for the reference climate) and subsequently seasonal heat consumption (adopting the appropriate length of the heating season). The detailed description of such method can be found in [30].…”

“…There were also several articles describing parts of the project and achieved results. The seasonal heat demand in buildings based on short measurement periods was presented in [28][29][30]. Indoor environmental conditions were analyzed focusing on the operative temperature and air quality [31,32].…”

Estimation Of The Seasonal Demand For Cooling Based On The Short-Term Data

“…5). The mean daily cooling power P C,av = 12.65 kW was determined based on the regression equation (Eq.2) and the seasonal demand of cooling was calculated as Q C = 233.9 GJ using equation (3). The value of the seasonal cooling demand determined using the H-m method differs from the one obtained from the simulation by 6%.…”

“…The shortest possible measurement period was sought in order to obtain the suitable accuracy. Using the balance approach, it is possible to determine the heat consumption for heating and ventilation of the building in the reference heating season, based on on-site short 14-day measurements, with uncertainty of up to 20% [3]. The balance approach was also tested in cooled buildings equipped with the mechanical ventilation system.…”