70 Infrastructure cooling solution Boosted capacity indoor systems High reliability at lower running costs for infrastructure cooling Split air conditioning systems for normal comfort cooling applications usually combine indoor systems with matching capacities, or multiple indoor systems with capacities lower than the outdoor system’s capacity. This works because the indoor system’s cooling capacity is sufficient to handle the higher humidity conditions and varying indoor temperature requirements that are common in a normal living environment. Applying this design logic to infrastructure cooling environments can lead to risky situations that might compromise overall system reliability and frequent downtimes of 15 minutes. Indoor systems for infrastructure cooling environments need enhanced capabilities for continuous heat transfer because they work harder to extract energy by cooling dry air. Daikin recommends and offers asymmetric combinations (boosted capacity indoor combinations: e.g. 71 class outdoor + 100 class indoor). You can now confidently combine indoor systems with higher capacities than the outdoor system. This will boost heat transfer inside the technology or server room environments. Traditional solution Symmetric indoor-outdoor system combination Dedicated solution Te kW RH% 55 50 45 40 35 30 25 12 10 8 6 4 12 10 8 6 4 Time Evaporating Temperature Capacity Te kW 55 50 45 40 35 30 25 12 10 8 6 4 12 10 8 6 4 Time RH% Evaporating Temperature Capacity Infrastructure cooling application system solutions Improved solution Boosted capacity indoors increase the heat transfer capacity at low relative humidity Allows the system to operate with higher Te, guaranteeing continuous operation and reducing unwanted dehumidification Relative Humidity: reduces over time Capacity: reduced Evaporating temp: drops to compensate reduced capacity too low Te can lead to freeze-up prevention, causing system downtime Sensible Heat Capacity increases 20-40% with dedicated system combination. *EER = (SHC/Corrected PI) rekenvoorbeeld > Anthony (update in eerste proef) Low humidity + Low ambient environment Outside temperature Ta -5 °C Set-point 22 °C Humidity 35 % Indoor wet-bulb temperature 13 °C traditional solution RZAG71 + FAA71 Total Capacity (TC) 5.63 kW Sensible Heat Capacity (SHC) 4.28 kW Power Input (PI) 2 kW Co-efficient of Power Input (CPI) 0.39 Corrected PI 0.78 kW EER* 5.5 EER traditional solution 100% improved solution 82% 18% savings dedicated system combination solution RZAG71 + FAA100 Total Capacity (TC) 6.02 kW Sensible Heat Capacity (SHC) 6.02 kW Power Input (PI) 1.72 kW Co-efficient of Power Input (CPI) 0.45 Corrected PI 0.77 kW EER* 7.82 Between 20-40% sensible capacity increase Up to 18% savings on running cost
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