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Consider the microchannel cooling arrangement ofProblem 8.107. However, instead of assuming theentire chip and cap to be at a uniform temperature.adopt a more conservative (and realistic) approach thatprescribes a temperature of
(a) For the operating conditions prescribed in Problem 8.107 and a chip thermal conductivity of
(b) The channel geometry prescribed in Problem 8.107 and considered in part (a) is not optimized, and larger heat rates may be dissipated by adjusting related dimensions. Consider the effect of reducing the pitch to a value of
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Fundamentals of Heat and Mass Transfer
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- a buildiug has the following calculated cooling loads: RSH gain 300 kW RLH gain = 110 kW The space is maintained at the following conditions Room DBT 25°C, Room RH = 55% Outdoor is at 40°C and RH 50%. And 10% by mass of air supplied to the buildings is out door. If the air supplied to the space is not to be at a temperature lower than 18°C. Find (i) Miu amount of air supplied to space in m/sec. (ii) Mass flow rates of return air, exhaust air and out door air (i) Capacity, BPFand sensible heat factor of cooling coil. Given: Condition DBT RH Sp. Humidity Enthalpy °C g.w.v./kg d.a. kJ/kg d.a. outside 40 50 23.6. 100 inside 25 55 10.6 52.5 supply Specitic valume of air supply point 0.836 m³/kg, coil ADP=9°C. 18 41.2arrow_forwardH.WII Cooling Load Estimation An air conditioned room in the Basra city that measures 3 m wide, 3.5 m high and 6 m deep. The window size 1.5 m*1.5 m, mounted on the wall with no external shading and the door size 2m*1m. Calculate the sensible, latent and total heat gains on the room. What is the required cooling capacity? Assume all specification parameters that must be taken into account when calculating cooling load.arrow_forwardEXL/ Calculate Cooling load temperature di fference (CLTD) for Sonth wall from grouPDat 32° North latitude Assume darK Colour,design outoor temperature 35 ,desion Îndoor temperature TR=25.5 è, mean outdoor temperature Tm= 29.4 c and daily range DR=.6¢ at hour 14. on october21.arrow_forward
- Problem 9-3: A T-type thermocouple is used to measure temperature difference across insulation in the ceiling of a residence in an energy monitoring program. The temperature difference across the insulation is used to calculate energy loss through the ceiling from the relationship Q = k Ac (AT) where Ac = ceiling area = 15 m² k = insulation thermal conductivity = 0.4 W m°C L = insulation thickness = 0.25 m AT = temperature difference = 5°C Q = heat loss (W) The value of the temperature difference is expected to be 5° C, and the thermocouple emf is measured with an uncertainty of ±0.04 mV. Determine the required number of thermopile junctions to yield an uncertainty in Q of ±5% (95%), assuming the uncertainty in all variables other than AT may be neglected.arrow_forwardCalculate the cooling load for the refrigerated space considering internal temperatures of 2oC, -18oC and -18oC, respectively. And the external temperature is given as 35 degree, and - 10 degree celcius. draw one T-S diagram accounts for the entire system. Note: Refrigerant R410-A to be usedarrow_forward[wik problem-Two: A Cylindrical stainless steel inget (keys) 15 cm in diameter and 40 cm long passes through a treatment ference that is (6m) in length. The temperature of the furance gu is (1300°C). The inital ingot temperature is (100°C). The Combined het radinat and Convective heat transfercelli- -cient is (100 tk). Calculate the maximum speed with which the ingot should pass through the furnace if it must attain a temperature of (850 °C). Take (α=0.46×105 (Aust Velocitga 1.985 mm/3) -5arrow_forward
- a. An air stream passing through a 2-inch (1/6 ft) diameter, thin-walled tube is to be heated by high- pressure steam condensing on the outer surface of the tube at 320 °F. The overall heat transfer coefficient, h between steam and air can be assumed to be 25 Btu/(ft2.hr °F) with the air entering at 100 ft/sec, 10 psia, 40 °F. The air is to be heated to 150 °F. Determine the tube length required. Assuming Rayleigh Line flow, calculate the static pressure change due to heat addition. Also, for the same inlet conditions, calculate the pressure drop due to friction, assuming Fanno flow in the duct with f = 0.018. b. c. d. To obtain an approximation to the overall pressure drop in this heat exchanger, add the two results. Discuss the accuracy of this calculation.arrow_forward• A 6 MW generator had a thrust of 103,000 lb. The outside diameter of the step bearing is 12 in, and the inside diameter is 8 in. Employ a film thickness of 0.004 in. Use SAE 20 oil at 120 , the specific heat of the oil being 0.6 BTU/lb deg F, and density of 0.307 lb/cu. in Determine: (d) Temperature risearrow_forwardTo 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 D₁, 1 = 150 mm and wall thickness t; = 20 mm while the outer steel pipe has an inside diameter of D₁,2 = 250 mm and wall thickness to = 1;. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k = 0.055 W/m-K) between the two pipes does not exceed its maximum service temperature of 7p,max = 70°C. The ocean water is at T, = -5°C and provides an external convection heat transfer coefficient of h, = 500 W/m²K. The convection coefficient associated with the flowing crude oil is h; = 450 W/m².K. (2) It is proposed to enhance the performance of the…arrow_forward
- Example 1 A retail shop located in a city at 30°N latitude has the following loads : Room sensible heat = 58.15 kW %3D Room latent heat = 14.54 kW The summer outside and inside design conditions are Outside : 40°C DBT, 27°C WBT Inside : 25°C DBT, 50% RH 70 m²/min of ventilation air is used. Determine the following, if the by-pass factor of the cooling coil is 0.15 : 1. Ventilation load ; 2. Grand total heat ; 3. Effective room sensible heat factor ; 4. Apparatus dew point ; 5. Dehumidified air quantity ; 6. Condition of air entering and leaving the apparatus.arrow_forward6. A Thomas meter is located in an air duct of 2 sq ft cross-sectional area. The air weighs 0.083 lb per cu ft, and its specific heat is 0.24. Assume a controlled temperature differential of 5° and heater potential of 110 volts. Plot the velocity as abscissa and amperage as ordinate for veloc- ity 0 to 300 ft per min. Assume constant amperage of 3, and plot tem- perature difference against velocity. Discuss the curves from the stand- point of accuracy of the system. J: よ itet legeted oulindriool oir tubearrow_forwardTask 01 An industrial freezer is designed to operate with an internal air temperature of -20 0C when the external air temperature is 25 0C and the internal and external heat transfer coefficients are 12 W/m2K and 8 W/m2K , respectively. The walls of the freezer are composite construction, comprising of an inner layer of plastic ( k=1 W/m.K , and the thickness of 3 mm) , and an outer layer of stainless steel (k=16 W/m.K , and thickness of 1mm). Sandwiched between these two layers is a layer of insulation material with k=0.07 W/m.K and the thickness of 195mm. Find the overall heat transfer coefficient and determine the heat transfer through the industrial freezer.arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
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