COILS, COOLERS AND CONDENSERS
a secondary process or for satisfying a HVAC requirement such as space heating or hot water production, heat recovery allows industrial end- users to achieve further efficiency savings, while at the same time making working conditions more tolerable and improving a company’s e nvironmental credentials.
End-users can either purchase equipment which is designed to facilitate heat recovery or retrofit an existing chiller of 250kW upwards with a heat recovery section.
B efore committing to the latter option, e nd-users should take into consideration the a ge and condition of the plant, as well as its thermal output and load profile, to ensure they are likely to derive an acceptable return on their investment.
3) Component selection
From the point of view of energy usage, a chiller can be one of the most energy-intensive pieces of equipment to run.
H owever, maintaining the quality of key components that make up a chiller (such as pumps, the heat exchanger, compressors, condensers, electronic expansion valves, and EC fans to name but a few) can go a long way
towards improving the efficiency of a unit over the duration of its operational life.
4) Maintenance Depending on the temperature control
equipment, there are several short- and long- t erm checks that can be easily incorporated into a routine maintenance schedule to ensure a system performs at its most efficient for as long as possible. The best way to ensure all equipment is regularly checked is through a Planned P reventative Maintenance (PPM) Programme. F or chillers, industrial end-users should u ndertake regular system water quality checks a nd implement an effective water treatment programme to ensure the system is not at risk of contamination and operates efficiently. Regularly cleaning a chiller’s condenser will also d ramatically improve efficiency given its tendency t o block up on a weekly basis, especially in e nvironments with high dust or particle presence.
5) Refrigerant type
While legislation often dictates the types of refrigerant available, end-users have the opportunity to select low GWP refrigerants where appropriate, to reduce operating costs and
i mprove system efficiency. For example, newer chillers often incorporate screw compressors, so they can operate using the likes of R513A which is non-flammable, efficient, and benefits from a m uch lower GWP than its predecessor, R134a.
6) Power factor correction
Power factor correction is often overlooked by industrial end-users, despite its impact on energy efficiency. Ultimately, it measures how effectively electrical power is converted into useful output. With a chiller, compressor efficiencies average a power factor of around 0.86 yet some are o perating with a power factor as low as 0.81- 0.82, meaning electricity is not being used as efficiently as possible. By targeting areas with lower power factors, and correcting them to a s close as 0.95 as practical, industrial end- u sers can reduce on-going running current, and t herefore, power bills.
Some industrial processes will never change, but by harnessing ways of improving the efficiency of temperature control equipment involved in these processes, whether it’s opting for a low GWP refrigerant or factoring in free cooling, industrial end-users can quickly reduce t heir energy consumption and utility bills.
Daikin Applied
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