A co-flowing heat exchanger receives air at 800K and 15 MPa and water at 15oC and 100 kPa. The two flows exchange energy as they flow alongside each other to the exit, where the air should be cooled to 350K. Investigate the range of water flows necessary per kilogram per second of air flow and the possible water exit temperatures, with the restriction that the minimum temperature difference between the water and air should be 25oC. Include an estimation for the overall entropy generation in the process per kilogram of air flow. Support your analysis with graphical plots whenever possible to make your analysis easy to follow and understand. Assume that the heat exchanger loses heat to the environment which is at 4oC and estimate the range of that heat loss per kg/s of air flow in order not to violate the Second Law of Thermodynamics (i. e. in order not to get a negative entropy generation amount).

Jessie ran 5000 meters from the cops and an average speed of 6 meters / second before he got caught . how long did he run?

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

Clothing made of several thin layers of fabric with trapped air in between, often called ski clothing, is commonly used in cold climates because it is light, fashionable, and a very effective thermal insulator. so it is no surprise that such clothing has largely replaced thickand heavy old-fashioned coats. (a) consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 w/m·°c) with 1.5-mm-thick air space (k = 0.026 w/m·°c) between the layers. assuming the inner surface temperature of the jacket to be 28°c and the surface area to be 1.25 m2, determine the rate of heat loss through the jacket when the temperature of the outdoors is 0°c and the heat transfer coefficient at the outer surface is 25 w/m2·°c. (b) what would your response be if the jacket is made of a single layer of 0.5-mm-thick synthetic fabric? what should be the thickness of a wool fabric (k = 0.035 w/m·°c) if the person is to achieve the same level of thermal comfort wearing a thick wool coat instead of a five-layer ski jacket?