Ground Source Heat Pump (GSHP)

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Description Ground source heat pumps extract heat from the ground via pipes buried in the garden. The heat from the ground is absorbed into the fluid (water and vegetable based antifreeze) that circulates around a ground loop. Passing through a compressor, the temperature is raised to a level that can be used for heating and hot water.

If enough space is available, the loop is usually laid flat or coiled in trenches about two metres deep. However, it space is scarce, boreholes need to be drilled to install a vertical loop to a depth of up to 100 metres.

Advantages
  • Increased energy efficiency compared to air-source heat pumps as temperatures in the ground are fairly constant throughout the year
  • Requires little maintenance
Disadvantages
  • High initial investment cost
  • The overall efficiency may decrease if the heat pump is also used to provide hot water
  • Horizontal collectors may be less expensive than vertical collectors, but they require a lot of space and the ground cools down quicker as it is closer to the surface
Characteristic features

Ground source heat pumps has been called the most energy-efficient, cost-effective, and environmentally clean space conditioning systems that are available on the market after the US Environmental Protection Agency

Application barriers

High initial investment cost

Information sources http://energysavingtrust.org.uk/Generating-energy/Choosing-a-renewable-technology/Ground-source-heat-pumps
http://isoenergy.co.uk/products/index/?cat_id=2#overview-tab
Image
Trade: Building services
Parameter Minimal Value Maximal Value Unit
Dimensions

500/467/850

934/780/1,561

W/D/H in mm

Weight

103

395

kg

COP

2.9

5.11

COP Annual Degradation Rate

1.0

1.0

%

Permitted Operating Temperature

20

65.5

°C

Heating Capacity

10

60.0

kW

EER

5.18

6.01

Cooling capacity

10.4

39.2

kW

Heat Transfer Nominal Flow

7.5

171.6

l/min

Maximum Pressure

10

10

Bar

Sound Power Level

44

66

dBA

Type of Refrigerant

a chemical blend (R-410A)

a chemical blend (R-410A)

CO Emission

lowest

lowest

ppm

NOX Emission

lowest

lowest

ppm

Investment Cost

9.316

23.289

Operating Cost

1/4 of conventional equipment

1/2 of conventional equipment

Maintenance Cost

0.10

0.20

€/m2/year

Life Expectancy

25

30

years

Deterioration Description
Causes
Parameter
Degradation Rate
Measurement


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