Top 10 Techniques to Maintain High Efficiency Chiller.
Chiller Systems are part of every industry and companies in UAE, climatic conditions of Middle East makes it unavoidable from daily Life. So we can say indirectly Professional Chiller System Maintenance providers keep the life of Middle East People cool and happier. Growing demands for chiller service have to be solved in a timely Manner.
Chiller Repairing, maintenance and Servicing industries in UAE,
especially in Dubai and Sharjah are on the path of providing high
quality service with fastest techniques and methods.Chillers often
represent a plant’s single largest electric load. Operating chillers at
their peak performance will save energy and maintenance costs.
Here are the top 10 techniques to Maintain High Efficiency Chiller systems.
1. Keep a daily log
The
daily log is still the first step toward maintaining an efficiently-run
chiller plant and it allows you to easily generate trend reports that
help to identify maintenance needs before they become an issue.
2. Keep tubes clean for efficient heat transfer
Heat
transfer efficiency has the greatest single effect on chiller
performance, so clean heat transfer is fundamental to maintaining high
efficiency.Condenser tubes should be brush cleaned at least annually, or
per your demand maintenance schedule to keep them free of contaminants.
3. Treat condenser water to prevent scale, corrosion
All
condenser water loops using open cooling sources (such as atmospheric
cooling towers) require water treatment of some sort to eliminate scale,
corrosion and biological growth.Inspect chilled water loops once a year
or regularly with remote monitoring for general water quality and
evidence of corrosion.
4. Lower entering water temperature
Lowering the temperature of the entering condenser water will improve the chiller’s efficiency.
5. Keep chilled water flow rate between 3 to 12-ft per second
Changing
the chilled water flow rate affects a chiller’s performance. Too low a
flow rate lowers the chiller efficiency and ultimately leads to laminar
flow.The maximum recommended flow rate is typically around 12 FPS.
6. Maintain adequate refrigerant charge
The
actual amount of cooling a chiller provides depends on how much
refrigerant it moves through the compressor. Refrigerant leaks, as well
as air and moisture introduced into the system, will decrease efficiency
and the reliability of the system. A low refrigerant charge will cause
the compressor to work harder for less cooling effect.
7. Prevent inefficiencies caused by non-condensates
Non-condensates
can lower the real efficiency of the chiller from the rated performance
by as much as 4% at 60% load and 7% at 100% load. Purge units minimize
the effect of non-condensates.
8. Analyze compressor oil
Send
a sample of the lubrication oil to a laboratory for a “spectrometric”
chemical analysis once a year.Check oil filters for pressure drop and
replace them if the oil charge is replaced.Inspect chilled water loops
once a year or regularly with remote monitoring for general water
quality and evidence of corrosion.
9. Check operation of starters and motors
For
efficient operation of starters and motors, check the safety and sensor
calibrations on microprocessor controls.To prevent insulation faults,
test electrical motor windings for insulation resistance to ground and
winding-to-winding.
10. Install variable speed drives
The
chiller motor is typically the largest single electrical load in a
building. With the right operating conditions, variable speed drives
(VSD) can offer significant energy savings.
Chiller
systems are a Solution to larger Environmental Problem also ,with
cooling expenses accounting for 30% to 50% of your total energy costs
and rising fast, and the impending phaseout of chlorofluorocarbon (CFC)
and hydro chlorofluorocarbon (HCFC) refrigerants, there is a rapidly
growing need to replace large commercial air conditioning and
refrigeration systems with a modular chilling system.
