Proceedings of the REHVA Annual Meeting Conference Low Carbon Technologies in HVAC 23 April 2018, Brussels, Belgium https://www.rehvam2018atic.eu/ *Corresponding Author: katarina.simic@ugent.be 1 PERFORMANCE ASSESSMENT METHODS FOR BOILERS AND HEAT PUMP SYSTEMS IN RESIDENTIAL BUILDINGS Katarina Simić 1* , Marija Lazova 1 , Hugo Monteyne 1 , Jelle Laverge 1 , Michel De Paepe 1 1 Ghent University –UGent, Sint – Pietersnieuwstraat 41, 9000 Ghent, Belgium ABSTRACT According to the European Commission, 40% of the total energy use belongs to the buildings sector. That corresponds to 36% of CO2 emissions in the European Union alone. Currently, HVAC systems are the major energy users in the building sector. Therefore, there is a necessity to assess the performance of different energy/comfort systems in buildings. However, finding a way to mitigate the performance gap between the calculated and real energy use in dwellings is of great importance. In Flanders, the Energy Performance and indoor climate regulation (EPB) dates back to 2006. Since the building context related to energy demand has changed significantly over the past years, investigation on how to evolve building energy assessment method framework in the EPB regulation in Flanders by dealing with the current issues will be indispensable. In 2017, new EN52000 series of standards have been published, containing extensive methods of assessing the overall energy performance of buildings. The main focus of this article is to analyze the assessment methods for the energy performance of boilers and heat pumps for residential appliance by comparing methodology stated in respected Energy performance and indoor climate regulation in Flanders (EPB), EcoDesign regulations and EN52000 standard series. The aim for future research is to determine the parameters that mostly influence on the performance and in a next step compare the predicted performance to real energy use. KEY WORDS: Building system performance, HVAC, boilers, heat pump, regulations, standards 1. INTRODUCTION With extensive urbanization, the number of the buildings in urban areas will increase, resulting in a higher energy demand. The building sector is the biggest energy user exceeding industry and transportation sectors. The reason may be lying in inaccurate building design, oversized equipment particularly in operational stages or in inappropriate performance measurements techniques. Building energy performance assessment methods are crucial in order to obtain the efficiency of energy use in buildings. They represent ground bases in a way of making any decisions for improving energy efficiency and buildings use in general. Assuring new building performance assessment methodologies stands as a possibility to cope with aggravated energy issues as well. Residential buildings account for 75% of the total building stock in European Union [1]. Used energy in dwellings is mostly taken by space heating (68.4%) and hot water production (13.6%) [2]. Energy used for powering electrical appliances in the dwelling is far less significant with the share of (3.8%) for cooking and (14.1%) for lighting. Data were retrieved on the ratio of energy use by the end uses divided by the number of permanently occupied dwelling. This is illustrated in Figure 1 and is represented for the countries of EU.