Geothermal Central Heating

A renewable form of energy, ground source(geothermal) heat pumps use the ground as their main energy source.

They do this by utilising geothermal collectors or geothermal probes that are buried into the surrounding land. With ground temperatures remaining stable all year round, ground source heat pumps are able to provide the greatest efficiencies of the heat pump types - unequalled on performance and running costs.

Ground source heat pump systems take heat energy from the ground and pass it through a heat exchanger into a heat pump, which works like a refrigerator but in reverse. These units can also work as water source heat pumps where water, such as lakes, are available as a heat source.

These solutions provide heating and hot water for your home. Combined geothermal central heating and cooling systems are also now available. As well as providing warmth during colder weather, these solutions work in reverse when it’s hot outside and provide cool air to help keep your home at a comfortable temperature year-round.

At Red Dwarf we have been installing geothermal central heating systems for well over a decade as they first made their way into the New Zealand market. As with any system, correct design and knowledge is required from the planning stage to ensure sound operation. Too many times we have come across systems installed incorrectly resulting in poor efficiencies and costly repairs.

Geothermal Central Heating Queenstown NZ

IS IT RIGHT FOR MY PROJECT?

With any geothermal central heating installation, it’s important to get the sizing of the system right. The correct size of heat pump and ground circuits for your property will depend on the size of your property and your specific heating needs. When calculating this, you’ll need to know how much heat is lost from your property - and this is affected by a range of factors, including how well glazed and insulated it is.

Your geothermal central heating installation will be sized to counter the loss of warmth from your property and to ensure that the heating needs of your property are met comfortably even on a cold day in winter.

Longer ground circuits will draw more heat from the ground, but they need more space to be buried in. If there’s a shortage of space, a bore hole may be buried vertically rather than horizontally.

For larger properties, cascade operation can be used or an additional heating source may be required to meet the full heating demand.

PAIRING WITH RADIATORS

Renewable technologies such as ground-source and air to water heat pumps along with solar are becoming the preferred energy source for many.

However for these technologies to work efficiently they will only heat water at a lower temperature (around 35-55℃) compared to your standard gas or diesel boiler (around 70-80℃), this is due to absorbing heat from natural environments such as the air, ground or sunlight.

This means to achieve the same heat output and comfort levels in each space you either require larger radiators to compensate for the lower water temperatures and loss of heat output or more efficient ones.

To put this into perspective, the same radiator running on a hydronic heat pump system with 50℃ flow temperatures will have an output less than half of that if it was running on a boiler system with 75℃ flow temperatures.

We have a wide range of radiators designed to run with low water temperatures as well as floor heating systems which are all suited to be used with geothermal central heating heat pumps.

Solutions with Geothermal Central Heating

Removing heat from the ground or water, the geothermal heat pump will transfer this heat from 10-12 degrees up to 60 degrees via a refrigeration process. This results in an efficiency of up to 600%.

Expert planning is required for this system to work for you efficiently.

Applications where a geothermal heat pump is used:

Geothermal central heating
Heating water for central heating convectors and radiators
Floor and wall heating solutions
Domestic hot water provision
Pool and spa heating
Cooling
Commercial applications

Solutions that can be added:

Solar thermal system integrated for domestic hot water and/or heating/pool and spa heating
PV Electric solar array can be added with direct connection to the heatpump for maximum efficiency
Domestic hot water circulation pump for fast and efficient hot water service at your sanitary fixtures for your home
Heat recovery system - Passive house certified