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- 3.9 The heat transfer coefficients for the flow of 26.6°C air over a sphere of 1.25 cm in diameter are measured by observing the temperature-time history of a copper ball the same dimension. The temperature of the copper ball was measured by two thermocouples, one located in the center and the other near the surface. The two thermocouples registered, within the accuracy of the recording instruments, the same temperature at any given instant. In one test run, the initial temperature of the ball was 66°C, and the temperature decreased by 7°C in 1.15 min. Calculate the heat transfer coefficient for this case.What are the types of temperature sensors / devices used in industrial applications? (Give atleast 5 thermocouple sensors).Experiment: A cooling tower uses forced air and column packing to cool downward-flowing water. Inlet water temperature and water flow rate are varied to investigate effects on outlet water temperature, outlet air temperature, and outlet air humidity. The system is first observed operating with ambient room temperature water. A heat load is then applied to the water tank, and the system response is observed. This is to simulate a power plant starting up and placing a cooling load on the cooling water supply. The aim is to compare the system response with and without the load. Data from the Experiment and the make-up water mass flow rate are both shown in the following tables below. For the load cases, determine the net rate of water evaporation from the cooling water to the air using the equation for air flow rate. Compare this with the rate at which make-up water enters the system. For the load cases, determine the rate of work supplied by the pump and compare it to the pump power…
- Consider a cylindrical cross‐section pipe that is 50 m long with a 7 cm diameter, and which has a starting pressure of 320 kPa and an outlet pressure of 105 kPa. A pressure sensor is located 10 m from the start of the pipe. (a) Calculate the pressure that this sensor would read if the fluid were water (ρ = 1000 kg/m3 ). (b) If the pipe instead contains gaseous carbon dioxide in isothermal flow, would the pressure be the same at this sensor as if the fluid were water?Transient Cooling What are some of the factors and assumptions that would casue a different between the experimential convection coefficient, hexp, and the theorectical htheo?Thermocouples are devices used to measure temperature of a given sample or the surroundingmedium. These devices feature a “bead”, which has a spherical shape, and produces voltage upon changein temperature. For an engineering application at a pharmaceutical company, thermocouple devices arebeing tested for their responsiveness, i.e. how fast it can detect temperature changes in the environment(surrounding air). The engineers at this company have specified design constraints for an idealthermocouple: it must detect temperature changes no later than 1.5 minute, and the reportedtemperature value must be reasonably correct: at most %3 difference between measured and actualtemperature values is allowed.Four thermocouples from different vendors are being tested. Relevant properties of these devices arelisted below: The experiment involves placing the thermocouple from air at 20 °C to air at 150 °C, and monitoring thetime it takes for the measured values to reach 150 °C, which is the…
- b. A large potato is dropped into a pot of boiling water and allowed to boil for half an hour. Which type of system does this represent Lumped or distributed parameter? Provide a reason for your choice .. Comment on temperature distributions. (ii.)Question 2: The composite wall of an oven consists of three materials, two of which are of known thermal conductivity, kA 20 W/m K and kC50 W/m K, and known thickness, LA 0.30 m and LC 0.15 m. The third material, B, which is sandwiched between materials A and C, is of known thickness, LB 0.15 m, but unknown thermal conductivity kB. Under steady-state operating conditions, measurements reveal an outer surface temperature of Ts,o 20°C, an inner surface temperature of Ts,i 600°C, and an oven air temperature of T 800°C. The inside convection coefficient h is known to be 25 W/m2 K. What is the value of kB?A hollow steel sphere (k=312 BTU-in/HR.sq.ft.deg F) contains a 150-Watt electrical filament, and these data are known: inside radius = 10 in, outside radius = 12 in. The film coefficients for the inner and outer surfaces are 6 and 2 Btu/HR sq.ft deg F respectively; the environmental temperature is 85 deg F. If 1-in layer of insulation is wrapped around (k = 0.43 BTU-in/HR.sq.ft.deg F) the sphere and assuming steady state compute: (a) the temperature of the inside air, and (b) surface temperature between the sphere and the insulation. Please answer asap
- A hollow steel sphere (k=312 BTU-in/HR.sq.ft.deg F) contains a 150-Watt electrical filament, and these data are known: inside radius = 10 in, outside radius = 12 in. The film coefficients for the inner and outer surfaces are 6 and 2 Btu/HR sq.ft deg F respectively; the environmental temperature is 85 deg F. If 1-in layer of insulation is wrapped around (k = 0.43 BTU-in/HR.sq.ft.deg F) the sphere and assuming steady state compute: (a) the temperature of the inside air, and (b) surface temperature between the sphere and the insulation.In a hot ball, Biot number and Fourier number are 0.2 and (10). Find the temperaturedistribution at center, temperature distribution at ball surface, and actual to maximum heattransfer ratio uses charts/table also if neededPlease help and answer completely, i will surely give a good feedback. Thank you. Refer to the picture attached. The following pressure, temperature and specific humidity measurementswere made from radiosonde soundings on day 11 of the Wangara PBLexperiment: A. Characterize the various layers on the basis of local and nonlocal stability and discuss the differences between the two. B. Estimate the height of the inversion base (zi), as well as the PBL height (h). Discuss the sensitivity of the latter to the near-surface temperature. Answer in the format of Given, Required, & Solution.