EVALUATION OF THE ENERGY EFFICIENCY OF HEAT SUPPLY SYSTEMS OF A RESIDENTIAL BUILDING WITH HEAT PUMPS BASED ON COMPUTER SIMULATION

Abstract

This article presents an analysis of the energy efficiency of the heating system of a single-family residential building with the integration of a heat pump (HP) using climate data for Kyiv city. Specialized software complexes for calculation (GeoT*SOL), dynamic energy modeling (DesignBuilder/EnergyPlus), and techno-economic justification of HP systems implementation (RETScreen) were used for this purpose. The analysis was conducted for two types of HPs: air-to-water (air-based) and ground-source (ground-based), considering various temperature regimes of the indoor heating system. Based on the modeling results, it was determined that for an air-to-water HP with a nominal capacity of 7 kW, the average seasonal efficiency rating could be approximately 3.6 for the HP itself and 2.7 for the overall system. For a ground-source HP with a nominal capacity of 6 kW, the average seasonal efficiency rating is 4.7 for the HP itself and 3.75 for the overall system. The total electricity consumption varies within the range of 4800–5700 kWh for air-based HP and 3200–4300 kWh for ground-based HP. Depending on the HP capacity, the share of heating energy coverage ranges from 85-98% for ground-based HP and 79-98% for air-based HP. The simple payback period of the HP-based heating system compared to electric convectors is 15.2–17.0 years.