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Circulating pump V Cools 20 L of clear water from 30°C to 25°C in 15 minutes. Customer’s machine Circulating pump Flow rate gauge L Guide to Model Selection Example 1: When the heat generation amount in the customer’s machine is known. Heat generation amount Q: 400 W (at 25°C) Example 2: When the heat generation amount in the customer’s machine is not known. Heat generation amount Q Circulating fluid temperature difference ΔT (= T2 . T1) Circulating fluid outlet temperature T1 Circulating fluid inlet temperature T2 Circulating fluid flow rate L Circulating fluid : Unknown : 1.0°C (1.0 K) : 20°C (293.15 K) : 21°C (294.15 K) : 7 L/min : Water : Density γ : 1 x 103 kg/m3 : Specific heat C: 4.2 x 103 J/(kg・K) Q = ΔT x L x γ x C 60 x 1000 1 x 7 x 1 x 103 x 4.2 x 103 60 x 1000 = 490 W = Cooling capacity = Considering a safety factor of 20%, 490 x 1.2 = Obtain the temperature difference between inlet and outlet by circulating the circulating fluid inside the customer’s machine. Example 3. In cases where cooling the object below a certain temperature and period of time. The flow rate of the circulating fluid depends on the internal resistance of the customer’s machine and the length, diameter and resistance created by bends in the circulating fluid piping, etc. Check if the required flow rate of circulating fluid can be obtained before using. Precautions on Model Selection Series HED Model Selection Cooling capacity = Considering a safety factor of 20%, select 400 W x 1.2 = 480 W (at 25°C) or more. 588 W T2: Inlet temperature T1: Outlet temperature = 467 W ΔT x V x γ x C h x 60 x 1000 5 x 20 x 1 x 103 x 4.2 x 103 15 x 60 x 1000 Q = = Cooled substance total volume V Cooling time h Cooling temperature difference ΔT Circulating fluid : 20 L : 15 min : 5°C (5 K) : Clear water Density γ : 1 x 103 kg/m3 Specific heat C: 4.2 x 103 J/(kg・K) Cooling capacity = Considering a safety factor of 20%, 467 x 1.2 = 560 W 1427 HRG HRS HRZ HRZD HRW HEC HEB HED HEA IDH 