Estimate the heat loss rate from a person who can be approximated as a cylinder of...

Estimate the heat loss rate from a person who can be approximated as a cylinder of diameter 0.3 m and height 1.8 m. The (clothing) surface temperature is 23 °C and the cross wind flow velocity is 15 m/s. The ambient temperature is –23 °C. Neglect end effects from the cylinder. Assume steady state.

Solutions

Expert Solution

samet mamat answered 1 year ago

Next > < Previous

Related Solutions

Determine the rate of convection heat loss from both the top and the bottom of a...

Determine the rate of convection heat loss from both the top and the bottom of a flat plate at Ts = 80°C with air in parallel flow at T? = 25°C, u? = 3 m/s. The plate is t = 1 mm thick, L = 25 mm long, and w = 50 mm deep. Neglect the heat loss from the edges of the plate. Compare the rate of convection heat loss from the plate to the rate of convection heat...

Estimate the top heat loss coefﬁcient of a collector that has the following speciﬁcations: Collector area=...

Estimate the top heat loss coefﬁcient of a collector that has the following speciﬁcations: Collector area= 2m2 Collector slope =35⁰ Number of glass covers = 3 Thickness of each glass cover =4 mm. Thickness of absorbing plate =0.5 mm. Space between glass covers = 20 mm. Space between inner glass cover and absorber =40 mm. Mean absorber temperature, Tp =80 ⁰C Ambient air temperature =15 ⁰C Absorber plate emissivity, εp =0.10. Glass emissivity, εg =0.88 Wind velocity = 2.5m/s. Assuming...

A medical statistician wants to estimate the average weight loss of people who are on a...

A medical statistician wants to estimate the average weight loss of people who are on a new diet plan. In a study, he guesses that the standard deviation of the population of weight losses is about 20 pounds. How large a sample should he take to estimate the mean weight loss to within 8 pounds from the sample average weight, with 95% confidence? Is your estimation always correct? Please briefly explain your reasoning. If you start with a bigger sample,...

A hollow cylinder of ID 0.12 m and OD 0.14082 has a heat generation rate of...

A hollow cylinder of ID 0.12 m and OD 0.14082 has a heat generation rate of 5 × 106 W/m3. The conductivity of the material is 30 W/mK. The outside surface is insulated and heat is removed by convection over the inside surface by a fluid at 130°C with a convection coefficient of 226.26 W/m2K. Determine the temperature on the outside surface.

A local company is offering insulation that can reduce the heat loss by 80%, with an...

A local company is offering insulation that can reduce the heat loss by 80%, with an installation cost of $170,000 now. They estimates that the heat loss through the exterior walls of her warehouse will cost approximately $40,000 per year. She intends to keep the warehouse for 10 years. If the cost of the heat loss increases by $3,000 per year, after next year, what is the IRR?

How to estimate the size of a heat exchanger that is heat water up from 20C-120C....

How to estimate the size of a heat exchanger that is heat water up from 20C-120C. 5,000,000 g of H2O needed (5000 L H2O) I have calculated that Q = 2.093*10^9 J Please tell me how to determine what the size will be and how much power will be required for this heat exchanger to operate. please explain each step and equation

Heat from rain [5 pt]: The dissipative energy loss from drag force as rain falls from...

Heat from rain [5 pt]: The dissipative energy loss from drag force as rain falls from rain clouds deposits heat into the atmosphere, at a rate comparable to wind. In this problem, you’re going to compute the power generated by rain drag dissipation. (a) Assume a 1 mm radius spherical droplet of rain falls 1 km through the atmosphere at a terminal speed of 1 m/s. Determine the power dissipated by drag force for one such rain drop. Assume a...

3. a) Who gains and who loses from tariffs? Explain this gain and loss in terms...

3. a) Who gains and who loses from tariffs? Explain this gain and loss in terms of effect of trade on consumers and producers. Who is the consumer here and who is the producer? b.) With the help of a graph, clearly explain the effect of tariff on consumers and producers. What is the net effect on the economy’s total welfare? Does the effect on welfare depend on the amount of tariff?

A steam power plant receives heat from a furnace at a rate of 280 GJ/h. Heat...

A steam power plant receives heat from a furnace at a rate of 280 GJ/h. Heat losses to the surrounding air from the steam as it passes through the pipes and other components are estimated to be about 8 GJ/h. If the waste heat is transferred to the cooling water at a rate of 145 GJ/h, determine (a) net power output and (b) the thermal efficiency of this power plant

A counter-flow double-pipe heat exchanger is to heat water from 20ºC to 80ºC at a rate...

A counter-flow double-pipe heat exchanger is to heat water from 20ºC to 80ºC at a rate of 1.2 kg/s. The heating is to be accomplished by geothermal water available at 160ºC at a mass flow rate of 2 kg/s. The inner tube is thin-walled, and has a diameter of 1.5 cm. If the overall heat transfer coefficient of the heat exchanger is 640 W/(m2.ºC), determine the length of the heat exchanger required to achieve the desired heating using the effectiveness-NTU...

Subjects