Refrigerant for road transport

[nh3simman]

A local manufacturer wants to quote for transport refrigeration in Dubai.

With air cooled condenser at 40degC ambient and container temperature at -20degC, thats quite a lift for 1 stage.

What refrigerant is best for these types of applications?

[NoNickName]

Bock FKX50/775N for refrigerated transport, Te=-25°C, Tc=60°C, Tsuction=-15°C, COP=0.80 with R134a

[nh3simman]

Bock FKX50/775N for refrigerated transport, Te=-25°C, Tc=60°C, Tsuction=-15°C, COP=0.80 with R134a

Thanks NoNickName, I thought of the Bock and downloaded the FKX catalog from their web site.

The COP is low, is 2 - stage not an option here?

[NoNickName]

Yes it is. Costs are little higher, though.

[US Iceman]

What about R-507? I was under the impression this was a replacement for R-502, and R-502 systems used to operate in these conditions (or similar to) for many years with conventional equipment designs.

[NoNickName]

I think R507 would not be compliant to max allowable pressure on high side at that Tc.

[Gary]

A local manufacturer wants to quote for transport refrigeration in Dubai.

With air cooled condenser at 40degC ambient and container temperature at -20degC, thats quite a lift for 1 stage.

This doesn't strike me as an unusual lift. A bigger condenser perhaps, and a suction/liquid heat exchanger for sure, but nothing here that would warrant a second stage, IMO.

[US Iceman]

I think R507 would not be compliant to max allowable pressure on high side at that Tc.

I know. It's higher than R-134a, but this is really not much different than the old days with R-502 and air-cooled condensers.

R-507 is slightly higher than R-502 (based on memory), but the air-cooled condensers and other equipment should be able to operate under these conditions.

[NoNickName]

I don't know what is the max PS in South Africa. Definitely impossible to use in EU at that Tc.

[Latte]

How about just buying a Thermo king Magnum
R404, unit SHOULD !!!! work in ambients up to 50 degrees. i am sure carrier must have an option but just trying to keep reeferjon happy
http://www.thermoking.com/tk/index.a...euromideafrica

Regards

Raymond

[nh3simman]

If I look at R507A,



It is probably a bit close to critical. But, look how the characteristic of the gas squeezes the refrigerating efffect.

I guess in any event, you are constrained by the compressor manufacturers choice.

[NoNickName]

How about just buying a Thermo king Magnum
R404, unit SHOULD !!!! work in ambients up to 50 degrees. i am sure carrier must have an option but just trying to keep reeferjon happy
www.thermoking.com/tk/index.asp?region=euromideafrica

Regards

Raymond

the fact that thermoking does it, it doesn't mean it either works or it's the best thing to do. I remember Carrier is doing Free Cooling by pumping refrigerant in the condensing coils during winter time

[star882]

the fact that thermoking does it, it doesn't mean it either works or it's the best thing to do. I remember Carrier is doing Free Cooling by pumping refrigerant in the condensing coils during winter time

Make sure the refrigerant can flow from condenser to evaporator by gravity, then install solenoid valves across compressor and expansion valve. Open the valves and there's your heat pipe...

[nh3simman]

I don't know what is the max PS in South Africa. Definitely impossible to use in EU at that Tc.

What is PS?

[NoNickName]

Make sure the refrigerant can flow from condenser to evaporator by gravity, then install solenoid valves across compressor and expansion valve. Open the valves and there's your heat pipe...

Yeah, sure.
Aren't we interested in reducing the refrigerant amounts in chillers?
Isn't refrigerant taxed per Kg in Danmark and Norway?
What about a refrigerant loss?

For nh3simman: PS is service pressure, the max pressure allowed by national or international regulations.