Small project for HVAC engineer/consultant

[Monomial]

I have a small freeze dryer with a single stage R-404a compressor that can not handle the hot, humid climate in Thailand. The best it can do is get down to -33°C, which is not cold enough to act as a cold trap for freeze drying. It needs to cool to -45°C in order to be useful. I would like to convert the cooling system into a 2 stage design by replacing the existing condensor with a heat exchanger, and running a second R-134a refrigerant system through it that keeps the R-404a output on that heat exchanger at approximately 10°C.

 

I am looking for someone who can help me create an appropriate, cost effective design and assist me in building the system.

 

[codebunny]

any schematics? data sheets? info about where the system is located?

[Monomial]

4 hours ago, codebunny said:

any schematics? data sheets? info about where the system is located?

System is located in the suburbs of Northern Bangkok. No schematics or datasheets. This would be a trial and error solution.

 

 

[codebunny]

You mean like Rangsit and round there?

Trial and error sounds a bit expensive, I guess you have already run the idea past people and got some idea of what you need, where you get it from, and perhaps a manufacturer website to get info from?

[Monomial]

Yes. The unit is very near Rangsit. I do have an idea of what to do, but little experience an no idea of what I don't know. Most of it can fabricated from copper tubing and should be available locally or through the mail order services. This is essentially a back yard retrofit in order to increase the cooling capacity.