Energy Conservation

you can increase your performance (TR/Kw) by subcooling your refrigerant at the condenser,you can do this by increasing coolant flow in your your condenser to increase its capacity or by-pass certain amount of evaporator flow to cool the refrigerant leaving the condenser. However, the previous will increase condenser load while the latter might decrease the cooling effect of your evaporator, determine which is more beneficial. i don't think there much you can do with the compressor, it's already a 3 stage, unless you can add more stage to reduced your Kw.

good luck!

Thanks Lito

Can u suggest me how the subcooling of refrigerant done ? or it required any modification i.e. one more heat exchanger is to be provide.

sub-cooling can be accomplished by increasing condenser heat load through cooling tower capacity increased, either by increasing coolant(cooling water) flow or by increasing heating surface area (adding one more heat exchanger is one), or by-pass some evaporator refrigerant to condenser discharge liquid line (or through a separate mixing chamber) thus cooling down the liquid refrigerant upstream of expansion device.

once again thanks for ur kind direction.

Thanks but is this recommendation is cost friendly, if i will go for it what the expected pay back time?

Few tips to save energy in Chiller plants

Carry out the regular PPM as per the manufactures' recommendation.

Use proper and efficient controls so that it senses the required parameters ( temperature) timely and accurately .

IF the chilled water is for comfort applications check the heat load losses .

Carry out regular energy audit and analyze the reading carefully.

Increase the area of evaporators and cooling towers, thereby raising the evaporation temperature and lowering the condensing temperature, which also decreases the compression ratio. Also, if possible, turn up various thermostats by 1, 2, 3, or so degrees.

It sounds as though you are "fighting" a high ambient temperature. What is your locale?

Thanks,

Pls suggest me can i provide one de-super heater at the o/l of compressor so that the o/l gas heat transfer done there and that hot water can be used at any else required equip.

Local ambient temperature in summer 45 to 52 with humudity more then 90% for 3 to 4 months.

This sounds like Dahran, one of the highest design wet-bulb places on earth. (Or a similar location.)

I'm not sure whether a desuperheater would be better than simply increasing the cooling tower capacity, such as by adding one or more cooling towers in parallel with the existing one(s). (My local conditions are much less extreme!)

In the U.S., I would ask some tower/condenser manufacturers for recommendations.

I'm not very familiar with R-123, but I wonder if it has the best characteristics for condensing pressure--and whether it is the best refrigerant choice (including safety issues).

What are some typical discharge temperatures from your existing compressors?

it is in between 120 to 130 *F

it is in between 120 to 130 deg F

i presume that you are using Trane CTV chiller. normally Trane simlex chiller are rated at 0.52 to 0.60KW/TR at 87 to 90F.

For your reference:

1. Trane chiller has option for to high effeciency(bigger condenser/evap size) rated at 0.45KW/ton.

2. Trane chiller can be operated to 72F inlet condenser temp. with optimized CT.

3. Trane duplex rated at 2000tons: 0.756kw/ton

4. Other manufacurer:

* York simplex rated at 2120tons: 0.715/kw/ton

* Mcquay duplex rated at 2500tons: 0.675kw/ton

Concerning your interest on CT reduction to your current load this has small benifets in terms of energy savings. The major impact on enegy savings is reduction of chiller CT water temperature to as much as 85F thereby chiller condenser pressure and ampere draw will decrease significantly.

THANKS, GOOD JUDGEMENT I M WORKING ON TRAIN CHILLERS, AGAIN THANKS FOR SHARING.

getting .75 to .80 TR/Kw.

It appears to be extremely low. please check whether it is kW/TR. One more information is missing- whether it is deteriorated or since beginning the same.

Efficiency of heat exchangers contribute a lot for efficiency of chilling system. Please check the water side parting pass gaskets of condenser and evaporator, whether any short circuit. Check the tubes for scaling or blocking. Check whether refrigerant charge level is correct. Check the overall performance with the design. As you have high ambient temp and RH most of time, cooling tower becomes less effective resulting to higher temp of condenser cooling water inlet which is one of the major cause of low efficiency. Check whether cooling tower is properly sized.