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A water cooler of storage capacity 120 liters can cool water at a constant rate...

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A water cooler of storage capacity 120 liters can cool water at a constant rate of P within closed circulation system as shown schematically in the figure the water from the coo is used to cool an external device that generates constantly 3Kw of heat thermal road 1 temperature of water fed into the device cannot exceed 30 C and the entire stored 120 lit of water is initially cooled to 10 C The entire system is thermally insulated The minimu value of P in watts for which the device can be operated for 3 hours is Specific heat of water is 4 2KJKg K 1 and the density of water is 1000kgm Cooler HOT Device

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