Comparative Dynamic Performance Tests Of Two Real Technology Packages For Buildings Heating System Retrofit

This work is performed within the framework of the THERMOSS EU project. The main objective of the project is to foster the deployment of advanced heating and cooling technologies with high replication potential, enabling 20-30% primary energy consumption reduction through thermal solar combination, model predictive control and storage strategy. The efficient match between supply and demand of energy is ensured by real-time management of thermal energy at building level and at district level for District Heating and Cooling (DHC) connected buildings. Before installing the systems in real THERMOSS demonstration sites by the end of 2018, the whole system test of two heating technologies (hybrid solar heat pump and interface unit to heat network) from the industrial partner has validated some recent features while assessing the performance of these technologies with dynamic reproducible boundary conditions (small residential buildings, Western European climate). The results assessed the primary energy savings in the range 9.7-36% and revealed its high sensitivity to control parameter settings related to the use of indoor temperature sensor. The realistic dynamic test also emphasized the major influence on the standby heat losses of thermal inertia of the system components combined with flow temperature control. For both technologies, the realistic radiator thermostatic valve emulation enabled to keep the deviation of the space heat load below 1.8% compared to the reference individual gas boiler.