PC-NOV22-PG50-51.1_Layout 1 15/11/2022 15:11 Page 51
PROCESS COOLING
A chiller/cooler combination system can lower manufacturing overhead and
maintenance costs and reduce water consumption and carbon footprint/CO2 tonne equivalence. It all minimises exposure to environmental risks
In the most efficient cooler concepts, large
pads are saturated with water from their top edge to raise the relative humidity of the air close to 100%. Following the latent heat of evaporation process, damp air hitting the warmer surfaces creates a temperature drop and increases the efficiency of the cooler. These coolers replace water spray cooling
towers, pumps, and their power costs. At the same time, the risks of water spray and spills associated with Legionella generation are minimised. The cooler’s pad irrigation system features an auto cut-off when the saturation point is reached. As a closed feedback system, no water is wasted, and costs for water treatment and water make-up through evaporation and bleed-off are reduced. On the company’s original 2018 proposal, the
total running cost of the existing system was calculated as £248,000 per annum, using an electricity unit cost of £0.056/kWh. The recommended centralised adiabatic cooling and chilled water systems with energy-saving control would reduce that down to £46,000 per annum with a payback period of 19.8 months. But that scenario, when reviewed
against today’s electricity prices (assumed at 48p/kWh), would see running costs of the original system increase to £1.84m p.a. Yet even allowing for a 25% increase in capital costs since 2018, that figure would reduce dramatically to just £391,000. Furthermore, the payback would also reduce to as little as 3 ½ months. So, if on top of that substantial result, the government’s super tax deduction is taken into account, the proposition has to be a no- brainer for any financial controller. This new way of thinking about process
cooling technology has resulted in a system that takes full advantage of the energy-saving opportunities presented through the UK’s temperate climate, resulting in substantial savings in electricity costs. Throughout the year we find many
customers lose water from their systems through tool changes and/or process water losses and the top-up is more often than not made up from the standard water supply.
Every year in the winter season we get service calls where the symptom is explained as a water leak. The root cause of this problem is frozen cooler coils or evaporators, and this has occurred due to reduced concentration of glycol/water mix in the process cooling fluid. We recommend that the glycol content of your systems should be at 30% which should provide protection down to 15°C, and that you check your glycol concentrations with a refractometer and adjust your glycol levels accordingly.
Atlas Copco
isocool.ltd.uk
WHAT IS YOUR CHALLENGE FOR US?
Some 70 years ago at DMN-WESTINGHOUSE, we made a choice that defined our future. Our mission became to provide dry bulk handling industries with high-end solutions that would prove their value for years to come.
Designing, engineering, and manufacturing high-end quality rotary valves and diverter valves, tailored to any demand and purpose, is what we do best.
It’s simply what we’re passionate about and what drives us to go the extra mile today, tomorrow, and every single day in the future.
Call for inquiries +44 1249 818 400 or email us at
dmn.uk@
dmnwestinghouse.com
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