# Thermal Bridge heat Transfer

**URL:** <https://community.freefem.org/t/thermal-bridge-heat-transfer/871>\
**Category:** General Discussion\
**Created:** [March 25, 2021, 5:09pm UTC](https://community.freefem.org/t/thermal-bridge-heat-transfer/871 "2021-03-25T17:09:06Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![arete](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/arete/32/475_2.png) [@arete](https://community.freefem.org/u/arete)\
**Post date:** [March 25, 2021, 5:09pm UTC](https://community.freefem.org/t/thermal-bridge-heat-transfer/871/1 "2021-03-25T17:09:06Z")

</div>

Hi i try to solve thermal bridge example of Featool  
[https://www.featool.com/doc/heat\_transfer\_05\_thermal\_bridge1#tut\_ht05](https://www.featool.com/doc/heat_transfer_05_thermal_bridge1#tut_ht05)

my heat equation with convection and diffusion

```
problem heat(u,v) =
int2d(Th)( kappa * (dx(u) * dx(v) + dy(u) * dy(v)))   	
 + int1d(Th)(Rs * u * v)
  - int1d(Th)(Rs * Ts * v);

```

Rs and Ts are function  
func Ts =  
+ (0.0)_(label==Te)  
+ (20.0)_(label==Ti)  
;

```
func Rs =
+ (0.11)*(label==Ti)
+ (0.06)*(label==Te)
;

```

In the tutorial set label isolated

 ![image](https://canada1.discourse-cdn.com/flex030/uploads/freefem/original/1X/65c9f7bbbef9d5d1a0dfa45a560a5f99b9820de3.png)

How-to set label are isolated whith freefem++?

---

<div class="post-metadata">

**Author:** ![frederichecht](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/frederichecht/32/15_2.png) [@frederichecht](https://community.freefem.org/u/frederichecht)\
**Post date:** [March 25, 2021, 7:19pm UTC](https://community.freefem.org/t/thermal-bridge-heat-transfer/871/2 "2021-03-25T19:19:36Z")

</div>

It is very simple , do nothing on this border.