Annual performance analysis of heat emission in radiator and underfloor heating systems in the European reference room.

Karl-Villem Võsa,Andrea Ferrantelli,Jarek Kurnitski,S.I Tanabe,J Kurnitski,P Wargocki,H Zhang,L Mazzarela,G Cao,I Nastase,C Inard,M.C Gameiro Da Silva

doi:10.1051/e3sconf/201911104009

Abstract

In this paper, we investigate the energy usage and emission efficiency of radiator and underfloor heating systems coupled with ON/OFF and PI controls, by performing annual simulations with the IDA ICE software package. Results from measurements carried out in early 2018 at the nZEB test facility near the Tallinn University of Technology are used to calibrate validated emitter and controller models. The calibrated models are then used to assess the energy performance of the systems in a simulation spanning the whole year, using climate data for Strasbourg in the European reference room. The annual simulation is conducted in a specific room with fixed geometry and boundary conditions. As a novelty value of the present study, we impose a non-standard control strategy based on maintaining a specified operative temperature within the room. A single-valued performance indicator, in the form of an increased air temperature set-point, is accordingly obtained for each emitter configuration to be used in further calculations of hourly, monthly or annual heating energy usage. Such a temperature increment accounts for imperfect control, air stratification within the room and the additional temperature increase that is required for achieving a desired operative temperature.

Highlights

Accurate measurements and predictions of energy consumption within a building are vital for sustainable and efficient energy management
We investigate the energy usage and emission efficiency of radiator and underfloor heating systems coupled with ON/OFF and PI controls, by performing annual simulations with the IDA ICE software package
The root mean square errors (RMSE) are lower for the underfloor heating (UFH), 0.92 and 0.72 °C for ON/OFF and PI control respectively

Summary

Introduction

Accurate measurements and predictions of energy consumption within a building are vital for sustainable and efficient energy management. The European standard EN 15316 [6] proposes an approach that tries to quantify the effect of different components of the system, e.g. the room air stratification due to the emitter system, the control accuracy of the system due to imperfect control, and the effect of the system on thermal comfort, which is expressed by the operative temperature [6, 7, 8, 9] This quantification takes the form of additive set-point increments to the initial room air temperature set-point, to account for the additional energy needed to overcome the effects of these components

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Conclusion