Ground source heat pumps (GSHPs) are one of the most widespread forms of geothermal energy technology. They utilise the near-constant temperature of the ground below the frost line to achieve energy-efficiencies two or three times that of conventional air-conditioners, consequently allowing a significant offset in electricity demand for space heating and cooling. Relatively mature GSHP markets ...

The development of the ground source heat pump (GSHP) has been limited by its relatively weak capacity of heat transfer, so the GSHP system normally requires large-scale heat exchangers and higher initial capital investment. Nevertheless, its potential for application of earth energy and friendly environmental protection has drawn a great attention from the international societies and a lot of ...

This paper discusses the research and the state-of-art practices on ground source heat pump systems (GSHP) in China. It introduces the Chinese patents on GSHP. The GSHP development policies of China, including incentive mechanism, relevant codes and regulations, are also introduced. In addition, this paper discusses and summarizes the shortages and imperfects of the current research of the GSHP...

This paper presents the performance of a water-to-refrigerant type ground source multi-heat pump (GSHP) system installed in a school building in Korea. The evaluation of the performance has been conducted under the actual operating conditions of the GSHP system. Ten units with the capacity of 10 HP each were installed in the building. Also, a closed vertical typed-ground heat exchanger with 24 ...

Energy crisis and environmental pollution have become major challenges in China’s economic development, which has triggered the demand for alternative energy sources and promoted the popularization of ground source heat pump technology. A ground source heat pump (GSHP) is a central heating and/or cooling system that transfers heat to or from the ground. It uses the earth as a heat source (in th...

Higher energy prices and concern about climate change is drawing increasing attention to ground source heat pump (GSHP) systems. Their clear advantage lies in being able to provide heating using 25 to 30% of the energy consumed by even the most efficient conventional alternatives. Their drawback has been high capital costs and uncertainty about whether the emissions associated with the electric...

Ground-source heat pump (GSHP) utilizes the immense renewable storage capacity of the ground as a heat source or sink to provide space heating, cooling, and domestic hot water. GSHP systems are generally comprised of water source heat pumps and ground heat exchangers (GHX). Vertical closed-loop GHX is used predominantly in commercial and institutional applications. Closed loop GHX consists of a...

-The activities of three enzymes cytosolic superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSHP), and malonyldialdehyde (MDA), a by-product of lipid peroxidation, were determined in whole lungs of normal and bleomycin-treated rats. Two days after bleomycin treatment total lung SOD, CAT, and GSHP activities were significantly (19 < .025) depressed between 15 and 25%. The ...

Thermal efficiency of borehole heat exchangers (BHE) is of crucial importance for the design and optimization of ground source heat pump (GSHP) system. This paper investigates thermal efficiency of a BHE with three drillhole diameters: 121 mm, 165 mm and 180 mm. The BHE was installed in a GSHP system of an office building located in Nuremberg, Germany. Thermal properties and hydraulic propertie...

Since a GSHP (Ground source heat pump) system uses thermal heat of the ground as a stable source of heat, its high system efficiency is expected to help save energy and reduce CO2 emissions, as well as alleviate the heat island effect because it does not release heat to the atmosphere. In Japan, the concept of GSHP systems began to attract interest from around 1980 as an energy-efficient techno...