Chapter 5, Problem 5.78P

A water cooler for drinking water should cool 25 L/h water from 18 C to 10 C while the water reservoirs also gains 60 W from heat transfer. Assume that a small refrigeration unit with a COP of 2.5 does the cooling. Find the power input to the unit.

A refrigeration system has a heat added of 440 kw. If COP is 7,find the mass of cooling water in the condenser for a temperature increase of 14°C.

A refrigerator working between 283 K to 310K and extracting 340 J of heat. How much work required to run the refrigerator.

A solar collector absorbed 40W/m2 heat from the atmosphere. This is equal to the convection brought by air for drying purpose. If the temperature of the air is 40C while the solar collector area's temperature is 80C and neglecting effect of radiation, find the convective heat transfer coefficient.

Kentaja is volunteering with Doctors Without Borders, and is distributing the Maderna vaccine in Libya. She is in a region wheré the average Summer temperature is 104°F, but the Moderna vaccine must bé kept in a 50°F refrigerator for distribution. Kentaja remenmbers her Physics training and designs a refrigerator that uUseš retrigerant 12 and has a mass flow rate 0.004 kg/s that 'does the job. For Kentaja's refrigerator calculate : A.) Power input required by the compressor B.) Coefficient of performance

/Heat is transferred from a tank of water in a refrigerator at(OC) degrees to a tank of boiling water at (100 C) degrees. With a reversible machine (heat pump). Calculate the Heat drawn from the refrigerator. if it was The heat transferred to the tank of boiling water is 2254kJ.

One of the Computer company in the US uses carnot heat pump to be used for heating its office and maintaining it at 230C during the winter.. The average outdoor temp outside office is 30C. The office is estimated to lose heat at a steady rate of 27600 kw.

Diagram please

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