<html><head><title></title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/></head><body><div style="font-family: arial,helvetica,sans-serif; color: #000000;">
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; color: #000000;">Dear TRNSYS-users,</span></p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; color: #000000;">I use the TYPE 997, which models pipes buried in the ground with an optional insulating layer on the surface and optional thermal insulations down the edges of the pipe area.</span></p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; color: #000000;">I am not sure about the correct way for the input of the pipe parameters. I want to model one or several pipe layers with 7 pipes /loops </span><span style="font-family: arial,helvetica,sans-serif; color: #000000;">in each layer, </span><span style="font-family: arial,helvetica,sans-serif; color: #000000;"> 100 m long each. The pipe spacing is 15 cm. These pipes are arranged in the pipe layer in serpentines. All pipes are connected in parallel. </span></p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; color: #000000;">My first attempt was to simply specify 7 pipes with the appropriate length, each with the same input temperature equal to the input temperature of the ground heat storage. Also I specified the distances from the field of pipes to the downward insulation (10 cm) and the properties of the downward insulation.<br /></span></p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; color: #000000;">But I wonder if this is the right way for the specification of the pipes. Now, if the model assumes the field of pipes to be 100m+2*0.1m = 100.2 m long and 6*0.15m+2*0.1m = 1.10 m wide, this leads to a much longer perimeter and much higher heat losses than the configuration I want to model with a roughly square area and about 40 m of perimeter.<br /></span></p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;">I want to model the arrangement of the pipes in serpentines, meaning that a pipe goes 10 m in one way, then back 10 m etc.</p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;">Should I specify 70 pipes, 10 m long each, spacing between pipes again 0.15 m, arranged in 7 groups, with the following temperature inputs for the pipes in each group:</p>
<p style="margin: 0px;">pipe No 1 has input temperture = input temperature to the ground heat exchanger.</p>
<p style="margin: 0px;">pipe No. 2 gets as input temperature the output temperature of pipe 1</p>
<p style="margin: 0px;">pipe No. 3 gets as input temperature the output temperature of pipe2</p>
<p style="margin: 0px;">etc. for the first 10 pipes</p>
<p style="margin: 0px;">and the same again for the next 10 pipes etc.</p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;">Will the code for this model then calculate the area as being of 10m + 2*0.1 m = 10.2 m length and a width of 69*0.15 m + 2*0.1 m = 10.55 m. This makes about hte same area, but with a perimeter length that is about a forth as in the case described above. For the heat losses along the perimeter of the ground heat storage I guess that makes quite a big difference. I have'n tried that yet. But still: For doing my calculations in the correct way I need to know which is the correct way to input the parameters for the pipes.</p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; color: #000000;">There is no description besides the short description and the information about the inputs in the proforma. And these do not answer my question. My description is a bit lenghty. But I tried to describe my problem clear enough.</span></p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; color: #000000;">Thank you for your answer and help in advance. With many kind regards.</span></p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; color: #000000;">Doris Buck</span></p>
<p style="margin: 0px;"> </p>
<br />
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; color: #000000;"><br /></span></p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"> </p>
<p style="margin: 0px;"><span style="font-family: arial,helvetica,sans-serif; color: #000000;"> <br /></span></p>
<p style="margin: 0px;"> </p>
</div></body></html>