Chapter 4 N38143 As a general rule the pressure drop across the grid cooler should be between 14 - 28kPa (2 to 4 psi) this can be acheived by keeping the water velocity below 0.46m/s (5ft/s). The above table shows data that will satisfy all world wide operational conditions. However, if the applica tion is known to be only operating in areas where the sea water temperature is unlikely to exceed 25 o C, then when sizing the grid coolers the maximum coolant temperature returning to the intercooler of 43 o C could be used and 75 o C coolant temperatures returning to the engine circuit.
Page 18 Heat rejection data (cont.) Engine model 4.4GM 4.4TGM 4.4TWGM 4.4TW2GM 6TG2AM 6TWGM Heat rejection Jacket water - Engine Btu/min 2440 2838 3338 TBA 5198 6541 kW 42.9 49.9 58.7 TBA 91.4 115 Aftercooler - Intercooler Btu/min - - 77.3 TBA - 1570 kW - - 13.6 TBA - 27.6 Water flow rate, thermostat fully open Engine US gals/min 22-40 20-40 Litres/min 150 150 150 150 77-150 77-150 Intercooler US gals/min - - - - - 20 Litres/min - - 102 102 - 91 Max coolant temp (from grid cooler) Engine oF 140 140 140 140 140 140 oC 60 60 60 60 60 60 Intercooler oF - - 100 100 - 100 oC - - 38 38 - 38