A pipe is buried underground during summer 20°C. Winter kicks in suddenly, and air at Too the ground for exactly 60 days. What minimum avoid freezing. Hint: you will either have to us
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- Specific Heat, Cp Water Thermal Thermal Content, Temperature, T Density, p Conductivity, k Ibm/ft3 Diffusivity, a ft2/s Food %(mass) °F Btu/h-ft.°F Btu/lbm-R Fruits/Vegetables Apple juice Apples Apples, dried Apricots, dried Bananas, fresh 1.51 x 10-6 1.47 x 10-6 87 68 62.4 0.323 0.922 85 32-86 52.4 0.242 0.910 41.6 73 53.4 0.127 1.03 x 10-6 0.650 1.22 x 10-6 1.51 × 10-6 43.6 73 82.4 0.217 0.662 76 41 61.2 0.278 0.856 Broccoli 21 35.0 0.223 | 1.42 x 10-6 Cherries, fresh Figs Grape juice 92 32-86 65.5 0.315 0.952 40.4 73 77.5 0.179 1.03 x 10-6 0.642 1.51 × 10-6 1.51 × 10-6 89 68 62.4 0.328 0.934 Peaches 36-90 2-32 59.9 0.304 0.934 Plums 3 38.1 0.143 | Potatoes 32-158 0-70 65.7 0.288 1.40 x 10-6 0.868 Raisins 32 73 86.2 0.217 1.18 x 10-6 0.592 Meats Beef, ground Beef, lean 67 43 59.3 0.235 1.40 x 10-6 0.802 74 37 68.0 0.272 1.40 x 10-6 0.844 Beef fat 95 50.5 0.110 72 95 73 Beef liver 0.259 0.832 1.18 x 10-6 1.40 x 10-6 Cat food 39.7 71.2 0.188 0.638 Chicken breast 75 32 65.5 0.275 0.850No card B a m OO ON 95)1:45 mlms.hu.edu.jo/mod/qu P Flag question Air is contained in a piston cylinder device, it expands first isothermally (1=>2) then isobaric expansion takes place (2=>3). The processes on the T-v diagram will be: Select one: A. (1-2) Horizontal line, (2- 3) Inclined line with Positive slope. B. (1-2) Horizontal line, (2- 3) Inclined line with Negative slope. O c. (1-2) Inclined line with Positive slope, (2-3) Horizontal line. D. (1-2) Horizontal line, (2- 3) Vertical line downward. E. (1-2) Inclined line with Negative slope, (2-3) Horizontal line. F. (1-2) Horizontal line, (2- 3) Vertical line upward. ...A convection problem has a Nusselt number equai to 10. where the contribution of diffusion is normalised and set equal to a value of 1.0. Select the correct statementis): | The ratio of advection to diffusion is 9. The ratio advection to convection is 10 The ratio of convection to diffusion is 10. The ratio advection to convection is 9. The ratio of advection to diffusion is 10.
- After the sinking of RMS Titanic, US operated the International Ice patrol with the purpose of monitoring the presence and movements of icebergs in the Atlantic and Arctic oceans. Once, they observed a unique tabular iceberg in a form of a rectangle (250 km x 50 km x 300 m). How many years would it take to melt the iceberg solely by heat from the sun if the ice absorbs a mean of 98 J/m2 -s, 12.5 hrs per day? Note: the exposed area for heating is 250 km x 50 km and the density is 920 kg/m3 . This is my solution.Heat transfer Question Please explain how to write an excel spreadsheet that will calculate the temperature at any time and any location for a cylinder that is being cooled by convection using the first 4 terms of the Fourier expansion that is a solution to the PDE. Input variables are to be Tj, Too, h, k, p, D.t Try this over a variety of Fourier numbers, some less than .2, some near 0.2, and some much greater than 0.2calculations. A common room at a facility is used by personnel for food consumption and resting (Fig. 2). An air conditioning system is required for providing comfortable temperature of 23°C. You are asked to select the room dimensions (X= 10m, Y=2.4m and Z= 15m) and design a split air conditioning system suitable to meet the requirements for climatic conditions of a humid subtropical climate with long-term annual average high temperature of 26.4°C and minimum low of 16°C. The room can accommodate up to 6 - 12 staff members. The following kitchen appliances are used in the room: coffee machine, 2 microwaves, cooktop and dishwasher. S E COFFEE 128 O FFEE FIGURE 2. Common room layout Z X COFFEE Y
- Surface tension is due to uneven molecular attraction between immiscible fluid media and solid surface. Its importance is governed by dimensionless parameter Which of the Inertia force called Weber number given by We = Surface tension force™ following statements are correct? (i) Surface tension becomes important when the length scale L is small such as in ink jet printing, coating of thin film, oxygenation of water by falling rain drops. (ii) 111 Super-hydrophobicity can be achieved by micro/nano texturing of surface such as in lotus leave, butterfly and dragonfly wing. During oil spill in ocean, oil floats and spreads out due to gravity. By conservation of mass, the oil film becomes thinner as it spreads. Finally, the surface tension force becomes important causing the formation of tiny oil droplets. (A) (B) (C) (D) (i) and (ii) (i) and (iii) (ii) and (iii) All of the aboveGood day. I require assistance as this will help in my examination review. (Basic Aerodyn Priciples) Air with an initial temperature of 18.03°C undergoes an isentropic process. After the isentropic process the density is halved, determine the new temperature. Provide answer in Kelvin. Round off answer to the nearest hundredths. **Would gladly appreciate an explanation. Thank you.7) Give two disadvantages of empirical thermometers. 8) Consider two liquids, A and B. with temperatures Te > TA. The two objects are put into thermal contact for a time period. Without just saying 'heat flows from hot to cold' how would you prove to someone that a quantity of heat flowed from B to A. (think of James Joule's experiments) 9) If the temperature of the sun were to suddenly double, by what multiplicative factor would the thermal radiation change ? Show Work
- To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k, = 45 W/m-K) has an inside diameter of D;, 1 150 mm and wall thickness f; = 20 mm while the outer steel pipe has an inside diameter of D; 2 = 250 mm and wall thickness t, = tị. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, between the two pipes does not exceed its maximum service temperature of Tp. max = 70°C. The ocean water is at T.0 = -5°C and provides an external convection heat transfer coefficient of h. flowing crude oil is h; = 450 W/m²-K. 0.03 W/m-K) 500 W/m2-K. The convection coefficient associated with the (2) It is proposed to enhance the performance of the…Solve this Differential Equation question applying the Newton’s law of cooling and heating: 1.) It was noon on a cold December day in Tampa: 16°C. Detective Tavlor arrived at the crime scene to find the sergeant leaning over the body. The sergeant said there were several suspects. If they knew the exact time of death, then they could narrow the list. Detective Taylor took out a thermometer and measured the temperature of the body: 34.5°C. He then left for lunch. Upon returning at 1:00 P.M., he found the body temperature to be 33.7°C. When did the murder occur? |Hint: Normal body temperature is 37°C.|Discussion: 1) discuss the methods of temperature measurement. 2) What is the reference of thermometers calibration tool? 3) What is the meaning of the temperature? What its units? 4) What is the faster method of temperature measurement? 4) Do you have another method or appearance that may be used temperature measurement?