Diesel Generator Over Heat Problem
Diesel Generator Over Heat Problem
(OP)
We are currently testing five diesel generators at the field .
all of the systems are identical (As we know)
The systems are operating Air Condition Compressor @ 21 Bar 310 cc and 24V 300 Amp alternators
Air condition compressor catalog power is 8 kW
Alternator is consuming 1 kW due to low need
According to this calculation we need 9 kW
Engine is 21 kW @ 1500 rpm Perkins
As one of our systems is working at 90C the all the other system is going to overheat at 112 C, and two of the ac compressors are seized(Nearly all of the compressor pressures were identical)
We checked ,hoses, coolant levels, bearings , radiator, fan but we couldnt find what could be the reason for overheat,
I am very suspicious about the AC compressor load, It shall consume more than double to go for overheat but the pressures were all the same ?
Do you have any comments ?
all of the systems are identical (As we know)
The systems are operating Air Condition Compressor @ 21 Bar 310 cc and 24V 300 Amp alternators
Air condition compressor catalog power is 8 kW
Alternator is consuming 1 kW due to low need
According to this calculation we need 9 kW
Engine is 21 kW @ 1500 rpm Perkins
As one of our systems is working at 90C the all the other system is going to overheat at 112 C, and two of the ac compressors are seized(Nearly all of the compressor pressures were identical)
We checked ,hoses, coolant levels, bearings , radiator, fan but we couldnt find what could be the reason for overheat,
I am very suspicious about the AC compressor load, It shall consume more than double to go for overheat but the pressures were all the same ?
Do you have any comments ?





RE: Diesel Generator Over Heat Problem
Here are a few quick thoughts,
(1)Just because you have a radiator and fan does not mean they are properly sized for the application.
(2)You checked the coolant level, but what about the mix of same? Too much antifreeze can be as bad as too little.
(3)Was adequate oil put in the AC system when it was charged?
RE: Diesel Generator Over Heat Problem
The mix is %50 and we have fully charged the oil according to the catalog data and oil sump stick.
I am suspicious that at 50 Degrees Celcius the Air Condition Compressor is using much more power than the catalog , and the calculated engine derate is around %40 so the systems looks like on its limits. But i dont get why one of them is not overheating .
RE: Diesel Generator Over Heat Problem
RE: Diesel Generator Over Heat Problem
RE: Diesel Generator Over Heat Problem
system on each of the different gen sets. Maybe the current draw is different for each separate AC/ Alternator unit.
Or are you saying that these AC/alternator units are mounted on the engine? I don't understand the actual setup that you have.
Either way a true test is to load bank it, and get rid of all the other parasitic losses of accessories.
RE: Diesel Generator Over Heat Problem
RE: Diesel Generator Over Heat Problem
rmw
RE: Diesel Generator Over Heat Problem
Another issue is the corrosion inhibitors that are part of the formulation of a good quality anti-freeze.
During my years in Honduras I twice heard severe weather alerts on the radio warning that temperatures would drop to 70 deg. F (21 deg. C) overnight. Not much winter but I always used a proper anti-freeze (coolant) mix when installing or servicing a diesel generator. 50:50 or close to it.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Diesel Generator Over Heat Problem
RE: Diesel Generator Over Heat Problem
I believe that my observations were valid even though the reason was not.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Diesel Generator Over Heat Problem
RE: Diesel Generator Over Heat Problem
RE: Diesel Generator Over Heat Problem
"Thank you!"
No sarcasm or putdown intended.
I gained some knowledge. That's what this site is for.
Thanks again.
Yours
Bill
Ps Have one on me in the Pub.
BR
Bill
--------------------
"Why not the best?"
Jimmy Carter