Trench pipe layout verses slinky trench design

[Marvin]

Slinky trench typical example 10m long produces about 1kw so 4kw equals 40m trench. However spacing between trenches 5m apart. So 200 square meters for 4kW

 

Single pipe down a trench about 15w per meter. Trenches about 1.2 meters apart. So 4 kW about 400 meters square?

 

All as rough numbers depending on lots of factors but you get the gist.

 

 

 

 

 

[Russell griffiths]

Bore hole, takes up 150mm square. 

[Marvin]

5 minutes ago, Russell griffiths said:

Bore hole, takes up 150mm square. 

Yup. Assume your talking about a closed loop system. And costing about 30k

[Russell griffiths]

No idea, it was just suggested to me to have a bore hole instead of 800m of pipe. 

[Nickfromwales]

39 minutes ago, Marvin said:

Yup. Assume your talking about a closed loop system. And costing about 30k

Who priced you at that amount?

[Marvin]

6 minutes ago, Nickfromwales said:

Who priced you at that amount?

No one. However...

 

https://www.imsheatpumps.co.uk/

[Marvin]

 

https://www.imsheatpumps.co.uk/

 

On their Web site ( you have to search ?

 

Answer: A 6-8 kW horizontal ground source heat pump system usually costs around £10,000 to £12,500 to install. A larger 12kW horizontal ground source heat pump system would cost around £15,500 to £17,500 to install. Vertical ground source heat pumps are more expensive due to the drilling of boreholes, so the equivalent 12kW system would cost around £30,000 to install.

 

Hope this helps.

[Temp]

3 hours ago, Marvin said:

Slinky trench typical example 10m long produces about 1kw so 4kw equals 40m trench. However spacing between trenches 5m apart. So 200 square meters for 4kW

 

Single pipe down a trench about 15w per meter. Trenches about 1.2 meters apart. So 4 kW about 400 meters square?

 

All as rough numbers depending on lots of factors but you get the gist.

 

 

My inclination would be to go with the larger collector to give the thing access to as much heat as possible. 

 

 

 

 

 

[tonyshouse]

Agree, don’t use slinkies, trench 2m deep and well apart, 5m if pos, and oversize collection field 

[jfb]

Can't you use a wide enough bucket so that you get a straight pipe down each side of the trench?