There is a flow of 238 kg/h of water that will enter a heat exchanger at 37 °C to be used as a cooling medium for an oil (Cp=2.1 kJ/kg °C) that will vary its temperature from 120 at 60°C. On the water side convection develops with (h=1250 J/s.m^2.°C), while on the oil side convection occurs with (84 J/s.m^2 °C). The area in the water side is 0.8 m^2, while on the oil side it is 1.1 m^2. The fluids are separated by a 4 mm thick steel barrier (k=45 W/m.°C). Estimate the flow of oil that can be cooled if the water temperature cannot be higher than 92°C.

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A food product with 73% moisture content in a 10 cm diameter can wants to be frozen. The density of the product is 970 kg / m³, the thermal conductivity is 1.2 W / (m K), and the initial freezing temperature is -2.5 ° C. After 14 hours in the freezing medium -40 ° C, the product temperature becomes -10 ° C. Estimate the convection heat transfer coefficient of the freezing medium. Assume the can as an infinite cylinder. h = Answer W / (m² K).

1. A wall of a house has a size of 20 mx 2 m. It consists of 3 layers of materials: 6 cm wood, 10 cm fiberglass, and 6 cm wood. The conduction coefficients of wood and fiberglass are 0.2 and 0.05, respectively. The radiation cannot be ignored, and the inner and outer surfaces of wall both have emissivity of 0.9. The room temperature in the house is always 20 C and the convection coefficient inside is always 5 W/m²-K. In a summer day, the outside temperature is 35 C and the convection coefficient outside is always 20 W/m²-K. In addition to the above heat transfer, the sunlight shines on the wall and gets absorbed. The energy of this additional sunlight heat absorbed by the wall is 800 W/m². (hint: the thermal circuit includes an additional heat source from the sunlight.) a.) What is the exterior temperature of the wall? b.) What is the the heat removal rate by AC to maintain the room temperature at 20 C ? c.) What would the exterior temperature and heat removal rate be if the fiberglass…