Hello RE !!

I am currently in the process of creating and dimensioning a AC unit, for the first time, and I have some questions regarding the pipes that are to be used.

The AC unit is to be used to Telecom cooling, and are designed to deliver 0.2 kW cooling, since it is for telecom cooling our main focus at this point is too keep it very compact, and therefor we are using a SECOP compressor called BD1.4 VSD 24VDC, and we use R134a as refrigerant.
The AC unit are to be deployed in deserts, jungles, and other harsh enviroments, so the ambient temperatures are pretty high (50 degree celsius), and the evaporator temperature has to be around 15 degree celsius, because this would deliver to optimal temperature to the electronics needed to be cooled.

As of right know we have dimensioned most of the system, and are now in the process of trying to figure out what specific components that we need to source, but we still need the correct pipe size.

We have a little trouble dimensioning the pipes of the system, we have used a program called CoolPack (made by the department of mechanical engineering, technical university of Denmark), and when plotting in the data, the only feasible pipes that we can use is as follows:
Suction line: 3/16" gives a velocity of 7.5 m/s
Discharge line: 1/8" gives a velocity of 8 m/s
Liquid line : 1/8" gives a velocity of 0.5 m/s

These pipes seem awfully small to us, but since we are new to this, we would like a second oppinion on it, hope you are able to help !! :-)

Regards Woot