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- Example: A water tank with a wall thickness of 10 mm and a water temperature of 90 "C.) Calculate the average heat loss per square meter (unit area) if the ambient air temperature is 15 "C. Take the thermal conductivity coefficient of the wall material 50 W / m C, the water heat-convection coefficient of 2800 W/m2°Cand the heat-convection coefficient of the ambient air 11 W/m2°C. Calculate the two temperatures of the wall surfaces.In a warm room a naked resting person has a skin temperature of 33k°if the room temperature is 29co,what is the body surface area if the rate of heart loss due to convection is 43 watt and the convection const.(7.1watt/m?. k°) 1.8 m2 1.6 m2 1.7 m2 1.5 m?The wind-chill index is modeled by the function W = 13.12 + 0.6215T – 11.37v0.16 + 0.3965TV0.16 where T is the temperature (°C) and v is the wind speed (km/h). When T = -19°C and v = 39 km/h, by how much would you expect the apparent temperature W to drop if the actual temperature decreases by 1°C? (Round your answers to two decimal places.) °C What if the wind speed increases by 1 km/h? ㅇC
- Can a medium involve (a) conduction and convection,(b) conduction and radiation, or (c) convection and radiationsimultaneously? Give examples for the “yes” answers.The average temperature of the atmosphere has increased by 0.4°C over the last thirty years. Estimate how much energy has gone into warming up the planet in this way. Keep in mind that the atmosphere has a mass of 5 × 1018kg, and the specific heat capacity of air is about 1 Jg−1K−1.The atmosphere of the planet Mars is 95.3% carbon dioxide (CO2) and about 0.03% water vapor. The atmospheric pressure is only about 600 Pa, and the surface temperature varies from -30°C to -100°C. The polar ice caps contain both CO2ice and water ice. Could there be liquid CO2 on the surface of Mars? Could there be liquid water? Why or why not? [please answer all questions. thank you]
- Assume that you are evaluating a building that has a heated slab-on-grade floor with edge insulation of R = 5.0 and a perimeter of 1000 ft. If your design temperature range is 5°F to -5°F, what is the heat loss, in BTU/hr, through the edge of the floor? 62,000 BTU/hr 31,000 BTU/hr 47,000 BTU/hr 23,000 BTU/hrThe thermal conductivity of snow varies by how tightly packed it is, but for snow of 100 kg/m3 density ,it is about 0.045 W/m/°C or 0.026 Btu/hr/°F. A half foot of snow will thus have an R-value of 19. A typical igloo is about 12 ft to 15ft in diameter and so it has a surface area of about 300ft2 .(We will ignore the floor ). Igloolik ,Nunavut , Canada requires about 20,000 degree days (Fahrenheit units) for a typical year .Calculate how many kilowatt hours you would need to keep your igloo cozy.In a warm room a naked resting person has a skin temperature of 33°C if the room temperature is 29° C, what is the body surface area if the rate of heat loss due to convection is 43watt and the convection constant K =7.1 watt /m?.K Choose the right answer: 1.8m? 1.5m2 O 1.7m2
- The atmosphere of the planet Mars is 95.3% carbon dioxide(CO2) and about 0.03% water vapor. The atmospheric pressure isonly about 600 Pa, and the surface temperature varies from -30 C to-100 C. The polar ice caps contain both CO2 ice and water ice. Couldthere be liquid CO2 on the surface of Mars? Could there be liquidwater? Why or why not?Soon after Earth was formed, heat released by the decay of radioactive elements raised the average internal temperature from 300 to 3000 K, at about which value it remains today. Assuming an average coefficient of volume expansion of 3.0 * 10-5 K-1, by how much has the radius of Earth increased since the planet was formed?Q6/ A spherical tank, 1 m in diameter, is maintained at a temperature of 120 C and exposed to a convection environment. With h=25W/m2.•C and To =15 C, what thickness of urethane foam should be added to ensure that the outer temperature of the insulation does not exceed 40 C? What percentage reduction in heat loss results from installing this insulation?