A cross-flow air-to-water heat exchanger with an effectiveness of 0.65 is used to heat water (Cp=4180 J/kg · °C) with hot air (Cp=1010 J/kg · °C). Water enters the heat exchanger at 20°C at a rate of 4 kg/s, while air enters at 100°C at a rate of 9 kg/s.
If the overall heat transfer coefficient based on the water side is 260 W/m²-K, determine the heat transfer surface area of the heat exchanger on the water side. Assume both fluids are unmixed.

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.

Which of the following refers to refers to how well the control system responds to sudden changes in the system. a)-transient regulation b)- distributed regulation c)-constant regulation d)-steady-state regulation

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg. k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m. k