Hybridization of Heat Pump Systems With Natural Ventilation To Improve Energy Efficiency in Cooling Dominated Buildings

Building foundation piles can be used as heat exchangers in ground-source pump (GSHP) systems to provide highly efficient renewable heating and cooling (H&C). Unbalanced H&C loads lead build-up the ground, decreasing system's overall performance. In this study, introduction of natural ventilation (NV) has been examined decrease load imbalance cooling-dominated buildings improve system efficiency. energy simulations estimated for an office building three Portuguese cities: Lisbon, Porto Faro, yielding 0.2–3.6 MWh/year 260–450 MWh/year. Four technology scenarios were assess performance: (1) air-source (ASHP) system; (2) a GSHP utilizing piles; (3) hybrid ASHP-NV (4) GSHP-NV. Over 50 years operation, Scenario COP values 2.45–2.55 (heating) 3.62–4.15 (cooling) obtained. (2), increased 4.15–4.34 but fell 3.36–3.79 (cooling), which annual final needs by 7–8%. ground temperature 21–24 °C, is unlikely acceptable. Compared (1), introducing NV reduced 65–90% Scenarios (4), with 59–80% 62–88%, respectively. A further benefit GSHP-NV that increase was limited 8‑12 °C. For cooling, decreased compared (3.14–3.69), while improved 3.45–6.10. This study concludes should considered some scenarios.