Refrigerant Gas Charging Machine

This sounds confused. Gas will not charge via gravity....

I don't know the set-up you have, but other than the first time you charge a machine, the following charge top-off's should to be minimal - otherwise you are spending too much money on lost refrigerant.

I charge liquid phase into a vacuum on the high side in big machinery so seldom it doesn't make any difference. If it takes time, it takes time - some things are better not rushed.

The rest of the time I vapor charge into the low side with the machine running.

Mr. Kesari,

1. Go for refrigerant recovery unit of about 500 l capacity. It can be used for charging refrigerant as well as for removing and storing. It will have in-built heater also. In fact real saving will come while emtying the machine when lot of gas at the end is lost.

2. How much time you are taking now for filling & how much you are aiming for is not clear. If you are taking about 3 to 4 hours (about 100 kg per hour), it is OK and I do not advise to go faster because it may result frosting at evaporator.

3. Please ensure that water is charged at condenser and chilled water at evaporator for faster filling. It will condense the vapour generated while filling liquid refrigerant in vacuum and keep system pressure lower so that differencial pressure compared with the bottle will be more for faster transfer.

4. If still you face problem of slow transfer rate, consider the following:

At present with existing set up, you can add a step of heating the filled bottles before connecting with the machine. Please note that you are charging liquid refrigerant, not gas. In the filled bottles, saturated vapour will be present on the top of liquid surface and its pressure will depend on temperature. When it is hanged in inverted condition before connecting with the machine, the vapour portion moves to the other end of the bottle to be on the top of the liquid surface again. So liquid from the bottom is connected to the machine, and rate of transfer is directly proportional to the vapour pressure on the top. So, to increase the transfer rate heat the bottle before connecting. Here are the simple ways of heating:

a) If you have a source of hot water or steam, pour it over the bottle.

b) Make a steel tank of size 1000 x 800 x 800 mm. Install imersion heater coils of about 5 kW. Keep refrigerant bottles inside the tank in upright position. Temp in water bath shall not exeed 60 deg C.

Thankyou sir..

i will try ur option and revert back.

Manish