Ground Source Heat Pump | Eco House Design | Part 6





Renewable Energy Source |Ground Source Heat Pump

A ground source heat pump (GSHP) is an energy efficient way of heating and cooling a dwelling. It is a central heating and cooling system that transfers heat to or from the ground. It uses the ground as heat source in winter, and heat sink in summer. This single system can produce space heating, space cooling and hot water.

Combining a ground source heat pump with active thermal insulation is an excellent option of heating a house. These two technologies are fit for each other.

A ground source heat pump is able to extract heat from the ground and concentrate it to provide heating for water or indoor areas, you can go to this site where you will find a great watering system. Some energy is required to operate the heat pump and heat exchangers. But net output of energy is greater than net input of energy. A 1 kW ground source heat pump could potentially provide heating or cooling equivalent of up to 4 kW energy.

Ground Source Heat Pump

Ground Source Heat Pump. Source: www.energysavingtrust.org.uk

Ground source heat pumps collect heat from up to 2m below the ground which is at a higher temperature than the surface during winter in the UK. A series of pipes are installed in the ground, known as the ground loop. A mixture of water and an antifreeze compound like glycol is pumped through these pipes. This antifreeze mix warms up as it travels in the loop, absorbing heat from the ground. Temperature difference between the fluid mix and dwelling of 3ºC to 4ºC should be enough for ground source heat pump to function effectively.

The returning warmed fluid is then fed to the heat exchanger, which in turn heats water which can then be pumped to radiators or active thermal insulation unit to heat the dwelling.

Heat pump performance is rated as a coefficient of performance (CoP). This measures how many units of heat are generated per unit of electricity used to drive the heat pump. For example CoP3 indicates that the system will give three units of heat energy for each unit of electricity used.

A CoP efficiency of up to 4 can be achieved by ground source heat pumps for water heating up to 35ºC. Performance coefficient decreases with an increase in required temperature for heating.

Modern ground source heat pumps are equipped with heat control systems as well as hot water tank for domestic use. They can also be combined with Solar Thermal collectors to heat the home when the ground becomes too cold for ground source heat pumps to function effectively.

Below are the steps to designing a low carbon house:

Eco House Design : Part 1

Introduction to the Eco House Design Guide

Design Methodology : Part 2
Eco House Design: Part 3

  • Climate of Brighton and Hove
  • Orientation of the building
  • Building design, construction and low energy specifications
 Eco House Design : Part 4

Eco House Design: Part 5

  • Windows and skylights;
  • Door air-gaps
  • Airtightness
  • Thermal Bridging
  • Monthly Energy Demand Profiles
Eco House Design : Renewable Energy Sources| Part 6

Ground Source Heat pump

 Eco House Design : Renewable Energy Sources| Part 7

Solar Electricity Generation

Eco House Design : Renewable Energy Sources| Part 8

  • Rainwater harvesting system
  • Mechanical Ventilation with Heat Recovery

Eco House Design : Renewable Energy Sources| Part 9

Annual Energy Balance

Eco House Design : Part 10 | Conclusion


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