Industrial Cooling Systems for Power Generation Facilities

Do not derive capacity from a fixed fraction of electrical output. Use the engine maker’s heat-rejection figures for jacket water, oil, charge air and other circuits, then assess plant load, outdoor design temperature and heat recovery.

Use the engine maker’s heat balance. A typical 1 MWe gas engine rejects about 500–600 kW through the HT circuit and 100–150 kW through the LT circuit. Without heat recovery, select the dry cooler to reject the total on the hottest design day, using approximately 90/80 °C HT and 45/40 °C LT water temperatures.

A common cause is exceeding the LT circuit inlet limit for the second-stage charge-air cooler. A dry cooler may deliver 45–50 °C water in summer while the engine requires 40–45 °C. Options include a lower-approach LT dry cooler, adiabatic pre-cooling or chiller support.

Yes. An 80–95 °C HT circuit is well above the dry-cooler approach temperature even on a hot Turkish design day. Keep the engine maker’s inlet-temperature, flow and glycol limits, often using its thermostatic valve to separate the loop. The dry cooler must be rated for 95 °C inlet water and jacket-loop pressure; the Kalter Series meets these stated conditions.

Not always. If HT heat is used continuously and a dry cooler can serve the LT circuit, a chiller may be unnecessary. If heat demand falls while the engine keeps running, reject unused heat through the dry cooler; add chiller support if the LT circuit would exceed its limit in summer. Design for the least favourable heat-use scenario.

Direct combination is unsuitable because their temperatures and duties differ. It reduces heat-recovery potential and can push LT inlet temperature above its limit. Follow the engine maker’s hydraulic diagram and temperature limits.

The result depends on climate, turbine capacity loss with temperature, stated in the source as 0.5–0.9% per 1 °C, electricity sales value and chiller energy. Subtract chiller and pump consumption from the extra electricity generated. The source estimates a net gain of 8–12% of turbine output in hot, humid climates.

Savings depend on process-water temperature, location and operating hours. The 80–95 °C HT circuit can use dry coolers year-round, and the 40–55 °C LT circuit can do so for much of the year. Compressor cooling may be needed only on the hottest days or for special low-temperature circuits. Calculate results from hourly weather and load data.

Add a standby chiller, dry cooler or pump beyond the units needed for design load. Dry-cooler redundancy is often provided at fan level. Also check single points of failure in exchangers, valves, sensors, controls and electrical supplies.

Measure chiller or dry-cooler inlet and outlet temperatures, flow, pump and fan power and compressor consumption over the same interval. Divide calculated cooling capacity by total electrical input to obtain system COP. Repeat at different outdoor conditions and loads.