Commercial Geothermal Hot water and Chilled Water

Geothermal Renewable Energy Commercial Water Heating Cooling reduces the cost of heating cooling large quantities of water up to 75%. With a certified coefficient of performance (COP) of between 3.5 and over 5.0, Direct Energy’s systems are verified by U.S. EPA to achieve 400% electrical efficiency and it does so every hour of the year by delivering renewable energyCSIRO have also more recently verified these efficiencies for water chilling.

 

Cost Benefits of Renewable Energy Water Heating / Cooling

Direct Energy’s geothermal heat pumps deliver up to 400% electrical efficiency. For every Watt of electricity consumed by Direct Energy’s compressor, the system delivers three to four times that amount of heat / cool energy to the water tank because it is primarily transporting renewable energy.

Even though the installed cost of the Direct Energy heat pump system is greater than traditional water heaters / coolers, the monthly energy savings in commercial applications are so large that the system quickly pays for itself.

A commercial user with a Direct Energy water heating / cooling system installed at a cost of $15,000, using 8,000 liters’ of hot water per day, an electric rate of $0.1/kWh, a temperature to 45oC and the electric resistance element raises it to 51oC, in comparison with an electric water heater saves $6,681 annually.

The cost recovery period in that case is 2.2 years, for a Return On Investment of 45.4%. If the installation cost were $20,000, payback would be within 3 years and Return On Investment would be 33.9%.

Environmental Benefits

Burning fuels to create hot/cold water wastes diminishing natural resources and can never achieve 100% efficiency. The process pollutes the environment with carbon dioxide and nitrogen oxides that are greenhouse gases. The U.S. EPA and DOE have determined that, in most applications, geothermal heat pumps are the most energy efficient and environmentally friendly heating systems.

Constantly Available Renewable Energy Source

The constant renewable energy from the earth is always available and is not dependent upon sunlight hours or temperate climate. This creates the ability to use heat pumps to deliver heat in cold climate and cooling solutions in hot climates, shifting demand off-peak and thereby use lower electric rates for water heating/cooling (including pools, radiant hydronic heating and thermal storage).

More recently, desert cooling applications have been tested by The U.S Department of Defence and CSIRO,
 CSIRO ASKAP case study.

Direct Energy vs Air Source Heat Pump for Water Heating

  • Higher efficiency due to constantly favourable renewable energy earth heat source
  • Can be located in mechanical room because of no need to circulate air over an exterior coil
  • Quiet operation resulting from total system enclosure and elimination of exterior fan and motor
  • Eliminates the exterior coil, fan, fan motor and capacitor, defrost timer, and ancillary wiring, making it mechanically and electrically simpler
  • Has greatly improved reliability and service life because of its simplicity and the stable temperature of this form of renewable energy

Application of Direct Energy’s Systems for Heating

The most economic application of Direct Energy’s system is to preheat large quantities of water.

Typically, the system provides pre-heated water to water heater tanks. As hot water is used, the preheated water is transferred to one or more commercial water heaters that further heat the water to the required use temperature. This becomes a powerful hybrid that increases system capacity and reliability.

How the Renewable Energy System Works

Direct Energy’s systems transfer heat by circulating water through HDPE earth loops that are trenched or bored into the earth. The water transfers heat from the constant temperature of the ground, through a patented flow control device to the compressor.

The compressor raises the pressure and temperature, and routes the hot vapour to the heat exchanger. The vapour, passing through sealed channels, transfers heat to circulating water. The water is heated and delivered to the hot water storage tank.

 

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