Abstract
This study assessed a variable flow rate control method for a circulation pump based on the geothermal water temperature difference in a geothermal heat pump system. As interest in energy conservation and efficient use is increasing around the world, the development and use of renewable energy is increasing and various related studies are currently underway. Among the renewable energy systems, the interest in geothermal energy system is high because of its efficient year-round operation. Geothermal heat pump system installations have increased in number, but the systems operate inefficiently. Generally in Korea, geothermal heat pump system operates under partial load conditions, but the circulation pump operates at constant speed and supplies a constant flow rate. Therefore, this study examined the operation of the current problems of a geothermal heat pump system. A variable flow rate control method of the circulation pump is proposed to improve the efficiency of the geothermal heat pump system and save energy during the cooling operation. As a result, the total energy consumption was reduced by 57,017 kW compared to the existing flow rate control method and the energy consumption of the circulation pump system was reduced by 35,209 kW.
Highlights
With the increasing interest in energy conservation and the efficient use of energy around the world, the need for the development and use of new and renewable energy sources has increased rapidly, and related research and applications have been actively conducted
The conventional flow rate control method of the geothermal heat pump system of the target building provides a continuous supply at a constant flow rate regardless of the load by installing a constant speed pump
To improve the efficiency of the geothermal heat pump system, the variable geothermal water flow rate control method was applied, and it was selected as CASE 2
Summary
With the increasing interest in energy conservation and the efficient use of energy around the world, the need for the development and use of new and renewable energy sources has increased rapidly, and related research and applications have been actively conducted. Among the new and renewable energy sources, systems using geothermal sources are attracting considerable attention. This is because while there is a lack of continuity of heat sources for systems using other heat sources, a stable supply of heat and efficient operation throughout the year are possible if geothermal energy is used as a heat source. While the installation of geothermal heat pump systems is increasing, the systems are not being operated efficiently. This results in a waste of energy due to the inefficient utilization after the Energies 2018, 11, 718; doi:10.3390/en11040718 www.mdpi.com/journal/energies
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