Abstract
Various efforts have been made worldwide to reduce energy use for heating, ventilation, and air-conditioning (HVAC) systems and lower carbon dioxide (CO2) emissions. Research and development are essential to ensuring the efficient use of renewable energy systems. This study proposes a multiple sources and multiple uses heat pump (MMHP) system that can efficiently respond to heating, cooling, and domestic hot water (DHW) loads using multiple natural heat sources. The MMHP system uses ground and air heat as its primary heat sources and solar heat for heat storage operations and ground temperature recovery. For the efficient use of each heat source, it also determines the heat source required for operation by comparing the heat source temperatures in the same time zone. A model for predicting the heat source temperatures, electricity use, and coefficient of performance (COP) was constructed through simulation. To analyze the efficiency of the proposed system by comparing the existing air source heat pump with ground source heat pump systems, a performance analysis was conducted by setting regional and system configurations as case conditions. The results demonstrate that the electricity use of the MMHP system was 13–19% and 1–3% lower than those of air source heat pump (ASHP) and ground source (GSHP) systems, respectively. In addition, the MMHP system was the most favorable in regions with a low heating load.
Highlights
To reduce energy use and associated carbon dioxide (CO2 ) emissions in the building sector, various studies focusing on heating, ventilation and air conditioning (HVAC) systems have been conducted worldwide
When ground heat is used as a heat source, the water outlet temperature of the ground heat exchanger is determined by Equation (13)
It consists of an multiple sources and multiple uses heat pump (MMHP) which is capable of using air and water as heat sources, a ground heat exchanger, a photovoltaic thermal (PVT) module, a heat storage tank (HST), and an FCU
Summary
To reduce energy use and associated carbon dioxide (CO2 ) emissions in the building sector, various studies focusing on heating, ventilation and air conditioning (HVAC) systems have been conducted worldwide. Lazzarin [7] compared the performance of SAGSHP and GSHP systems and found that the former had a stronger performance They found that the use of a solar heat source and reducing the length of the ground heat exchanger led to a lower investment cost than that of the GSHP system. When the solar heat collector of the SAGSHP system was used for ground temperature recovery operation and building cooling/heating, more efficient operation compared to a conventional. The developed heat pump system exhibited the same performance as existing GSHP systems, even when the length of the ground heat exchanger was reduced by half. There are few studies [15] on hybrid systems that simultaneously use multiple natural heat sources such as solar, air and ground for heating, cooling, and providing domestic hot water in buildings. Model, and additional analyses were conducted a control method to further improve performance
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