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DX system being drilled in the 1980s
A direct exchange (DX) geothermal heat pump is a type of ground source heat pump in which refrigerant circulates through copper tubing placed in the ground unlike other ground source heat pumps where refrigerant is restricted to the heat pump itself with a secondary loop in the ground filled with a mixture of water and anti-freeze.[1]
The simplicity of the DX designs is that high efficiencies can be reached using a shorter and smaller amount of buried tubing thereby reducing both the footprint and installation cost.[2]
^"The Types of Antifreeze Used in Geothermal Heat Pump Earth Loop Fluid". Retrieved 2016-11-17.
A directexchange (DX) geothermalheatpump is a type of ground source heatpump in which refrigerant circulates through copper tubing placed in the ground...
ground source heatpump (also geothermalheatpump) is a heating/cooling system for buildings that use a type of heatpump to transfer heat to or from the...
Geothermal heating is the direct use of geothermal energy for some heating applications. Humans have taken advantage of geothermalheat this way since...
A heatpump is a device that uses work to transfer heat from a cool space to a warm space by transferring thermal energy using a refrigeration cycle,...
absorption heatpump (AHP) is a heatpump driven by thermal energy such as combustion of natural gas, steam solar-heated water, air or geothermal-heated water...
differential in Leibniz's notation of a variable x Directexchange (DX), directexchangegeothermalheatpump, an energy-efficiency environmental control cooling...
manifolds and in tube coils. Geothermalheatpump technology, variously known as "ground source," "earth-coupled," or "directexchange," relies on circulating...
from radioactive decay. Geothermal energy has been exploited as a source of heat and/or electric power for millennia. Geothermal heating, using water from...
The heat is often obtained from a cogeneration plant burning fossil fuels or biomass, but heat-only boiler stations, geothermal heating, heatpumps and...
A heatexchanger is a system used to transfer heat between a source and a working fluid. Heatexchangers are used in both cooling and heating processes...
include heat or cold produced with heatpumps from off-peak, lower cost electric power, a practice called peak shaving; heat from combined heat and power...
conditions. The advantage of the heatpump is that it reduces the purchased energy required for building heating; often geothermal source systems also supply...
where naturally occurring heat, water, and rock permeability are sufficient to allow energy extraction. However, most geothermal energy within reach of conventional...
The Glossary of Geothermal Heating and Cooling provides definitions of many terms used within the Geothermalheatpump industry. The terms in this glossary...
contributors to this decay heat, and this radioactive decay is the primary source of heat from which geothermal energy derives. Decay heat has significant importance...
Alternative energy such as solar energy, heatpumps, hot water heat recycling, and geothermal heating can also heat water, often in combination with backup...
air source heatpumps and ground source heatpumps". Icax.co.uk. Retrieved 20 December 2013. "Choosing and Installing GeothermalHeatPumps - Department...
require a smaller, less-expensive photovoltaic system. A high-quality geothermalheatpump installation can have a SEER in the range of 20 (±). A 29 kW (100...
system when the pump stops. Many indirect systems use antifreeze (e.g., propylene glycol) in the heat transfer fluid. In some direct systems, collectors...
diameter and contains a simple heatexchanger made of small diameter plastic pipe, through which water is circulated. No heatpumps are involved. CTES (cavern...
projects. Designing Stirling engine heatexchangers is a balance between high heat transfer with low viscous pumping losses, and low dead space (unswept...
not actively volcanic, a large heat resource is potentially available via shallow geothermal ground source heatpumps, shallow aquifers and deep saline...
capture of natural sources such as concentrated solar power and geothermal energy. Common heat sinks include ambient air above or around a facility and bodies...
Refrigerators, air conditioners and heatpumps are examples of heat engines that are run in reverse, i.e. they use work to take heat energy at a low temperature...
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