The copper earth loop is a labyrinth of thin pipe like structures made from copper. This copper loop is connected with the heat pump to circulate the refrigerant throughout the system and to exchange thermal energy with the earth. The loops can be arranged in horizontal, vertical or diagonal manner. Having the highest temperature differential, the copper loop can extract maximum heat from the earth even with the least contact. Moreover, copper is a naturally available material which prevents corrosion and thus resists loop failure.
The heat pump is the heart of the system that circulates refrigerant through the loops. The heat pump consists of three important parts – compressor, condenser and evaporator. All the three components are sealed in a closed unit and work in the same manner as any conventional air conditioning unit. However, the unit is simpler as it does not have water circulating pump, heat exchanger or thermostatic expansion valve.
The flow of the refrigerant is controlled by two simple flow control devices – active charge control and liquid flow control. The mechanical controls adjust the flow of the refrigerant to ensure highest efficiency of the system. Without any use of complex electronic devices, the mechanical controls prevent the extra cooling of the condenser and thus keep lower refrigerant head pressure to facilitate less energy consumption and increased heat transfer.
The main advantage of heatlinked system is that as there is no water circulating loop or intermediate heat exchanger the installation, operation and maintenance costs are extremely low. Moreover, the system can be installed even in small area because of its small size.