[TRNSYS-users] Doubt in Type 997

[Jeff Thornton]

Re: Type997

Imagine you have insulation above the horizontal ground heat exchanger on the soil surface that stretches out 4 meters beyond the edges of the pipe area and no insulation beyond that.  This parameter would then be set to 4.

My bigger question is why you would be using a detailed ground heat exchanger model when you only have one pipe.  I would recommend one of the simpler buried pipe models - unless you need one of the unique features of the ground heat exchanger model (surface insulation, multiple ground layers, etc) 

Jeff

Sent from my iPhone

> On May 1, 2015, at 6:12 AM, SANJEEV JAKHAR <sanjeev.jakhar at pilani.bits-pilani.ac.in> wrote:
> 
> Dear sir,
> Within the GHP library, Ground heat exchanger (Type 997), i didnt understand the parameter "12" Length of surface extension: left (The distance that the surface (insulating layer or conditioned space) above the ground heat exchanger pipes extends beyond the edges of the pipes and towards the left (decreasing x)). 
> By default it is taking 2 m length. How does the change in this parameter effects the performance if i have taken a system of one pipe in one pipe layer. So please guide me.
> 
> Thanks & Regards,
> 
> Sanjeev Jakhar
> Research Scholar
> Center for Renewable Energy and Environment Development (CREED)
> Mechanical Engineering Department
> Birla Institute of Technology & Science, Pilani 
> Rajasthan - 333031
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