Performance assessment between a ground coupled and air source heat pump used for domestic hot water preparation

Calin Sebarchievici,S.I Tanabe,H Zhang,P Wargocki,G Cao,M.C Gameiro Da Silva,C Inard,I Nastase,J Kurnitski,L Mazzarela

doi:10.1051/e3sconf/201911106075

Abstract

A ground-coupled heat pump system (GCHP) and an air source heat pump (ASHP) driven by photovoltaic panels are used to provide domestic hot preparation for a NZEB house. The experimental measurements are used to test both the heat pump models in the same conditions of water temperature and volume of domestic hot water. A comparative analysis of the two heat pumps for domestic hot water preparation is performed. In addition, using the software TRNSYS (Transient Systems Simulation), two numerical simulation models of thermal and electrical energy consumption in DHW mode are developed. Finally, the simulations obtained using TRNSYS software are analysed and compared to the experimental data.

Highlights

Buildings are considered one of the largest energy consuming sectors, according to the International Energy Agency (IEA) the average energy consumed by buildings represents 32% of worldwide energy consumption
Studies have shown that buildings offer the greatest and most cost-effective potential for energy savings reducing greenhouse gas (GHG) emissions
European Union (EU) member states must stimulate the transformation of existing buildings undergoing renovation into nearly zero-energy buildings

Summary

Introduction

Buildings are considered one of the largest energy consuming sectors, according to the International Energy Agency (IEA) the average energy consumed by buildings represents 32% of worldwide energy consumption. European Union (EU) reveals that buildings are the greatest energy consumer, using approximately 40% of the total energy demand, followed by industry with 30 % and transportation with approximatively 30 % from total energy demand [1]. Studies have shown that buildings offer the greatest and most cost-effective potential for energy savings reducing greenhouse gas (GHG) emissions. Some actions are being performed to reduce energy consumption and to protect the environment (e.g., the use of renewable energies for new or retrofitted buildings and passive energy buildings). EU member states must stimulate the transformation of existing buildings undergoing renovation into nearly zero-energy buildings (nZEBs). Conversion of heating and cooling systems based to ground-source heat pumps and air-to-water heat pumps (HPs) is a well-proven measure to approach nZEB requirements. Conversion of heating and cooling systems based to ground-source heat pumps and air-to-water heat pumps (HPs) is a well-proven measure to approach nZEB requirements. [2]

Ground coupled heat pump

Air source heat pump

Findings

Comparison between measurements and simulations