Cooling & Heat Exchange KPV Series Cooler Bellhousings 139 Cooling Capacity It is generally accepted that, in the absence of an external source of thermal input, then heat loss of 30 - 40% of the equipment installed power will be required given that the motors and pumps are of average efficiency. A proportion of this heat is generally radiated by the individual components within the system, especially the tank, and so the cooler bellhousing will be required to maintain oil temperature at the required level. This can also be effected by the system application, for example in machine tools or in mobile operational cases, an average cooling power of 20 – 30% of installed power is required. As shown in the cooling power of the KPV fulfils this requirement to the full. The values shown apply to a Δt of 40K and to the optimum flow of oil. In the case of figure 1 lower or intermittent oil flow a separate cooling system may be necessary, this can easily be achieved with the KPV cooler. The interdependence between the cooling power and the oil flow is shown within . The specific values per 1K Δt allow a simple conversion of the actual cooling figure 2 power by multiplication of the respective Δt. Specific cooling power P/t of the series KPV depending on oil flow Q and temperature difference Δt = 1K (oil inlet to air inlet). Fig. 1 Specific cooling power P/t of the series KPV depending on oil flow Q and temperature difference Δt = 1K (oil inlet to air inlet). 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 KPV350 KPV300 KPV250 KPV200 Oil flow [l/min] Specific cooling capacity P/Dt (W/K) 0 10 20 30 40 50 60 70 80 KPV200 KPV250 KPV300 0,5 1,0 1,5 2,0 2,5 3,0 Pressure drop p [bar] Oil flow Q [l/min] KPV350 0 0 10 20 30 40 50 60 70 80 Fig. 2 Pressure drop of cooler matrix at the oil viscosity of 32 cSt. Correction factor for the ∆p-values depending on other viscosity in cSt kSt 15 22 32 46 68 100 150 220 460 k 0.64 0.73 1 1.28 1.62 2.65 3.9 6.9 17.1 A further attribute of the KPV series cooler bellhousing is the full interchangeability of the fitting dimension acc. to VDMA 24 561 and that, not only according to the fitting length, but also according to the fastening position of the foot brackets. This does not only make it possible to keep the complete installation, hydraulic pipework included, should the use of a cooler be later deemed necessary, it also allows someone planning hydraulic installations, to decide on the requirements for a cooler with and without noise damping at a later point. The KPV series cooler bellhousing can be built either as rigid version or as version with integrated noise damping. However, both versions have the same frame dimensions. The KPV series cooler bellhousing can be mounted horizontally IMB 35-version and IMB 5-version, with vertical as well as lateral cooling air flow. The KPV can just as well be mounted vertically – IMV1-version – as was possible with the previous example, the KP version. Despite the integrated noise damper, the more rugged cooling system and the VDMA foot brackets, the new KPV series is no more expensive than the former KP series and has better cooling ability. #DriveLineHarmony www.jbj.co.uk/cooling-heatexchange.html
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