- Tardigrade
- Question
- Physics
- A water cooler of storage capacity 120 liters can cool water at a constant rate of P watts. In a closed circular system (as shown schematically in the figure), the water from the cooler is used to cool an external device that generates constantly 3 kW of heat (thermal load). The temperature of water fed into the device cannot exceed 30° C and the entire stored 120 litres of water is initially cooled to 10° C. The entire system is thermally insulated. The minimum value of P (in watts) for which the device can be operated for 3 hours is <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/63af40657775db32e46cc541c44c79e9-.png /> (Specific heat of water is 4.2 kJ kg -1 K -1 and the density of water is 1000 kg m -3 )
Q.
A water cooler of storage capacity liters can cool water at a constant rate of watts. In a closed circular system (as shown schematically in the figure), the water from the cooler is used to cool an external device that generates constantly of heat (thermal load). The temperature of water fed into the device cannot exceed and the entire stored litres of water is initially cooled to . The entire system is thermally insulated. The minimum value of (in watts) for which the device can be operated for hours is
(Specific heat of water is and the density of water is )
Solution: