In a meat processing plant, 0.01-m-thick steaks (k = 0.45 W/m·K and α = 0.91 × 10−7 m2/s) that are initially at 25°C are to be cooled by passing them through a refrigeration room at -14°C. The heat transfer coefficient on both sides of the steaks is 9 W/m2·K. If both surfaces of the steaks are to be cooled to 2°C, determine how long the steaks should be kept in the refrigeration room (round to one decimal place). Solve this problem using analytical one-term approximation method. (Given: λ1=0.3111, A1=1.0161)
The length of time for the steaks to be kept in the refrigerator is
In a meat processing plant, 0.01-m-thick steaks (k = 0.45 W/m·K and α = 0.91 ×...
H8-1: An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k-15 W/m K) is used to store iced water at 0°C. The tank is located in a room whose temperature is 25°C. The convection heat transfer coefficients at the inner and the outer surfaces of the tank are 80 W/m2 K and 10 W/m2 K, respectively. Radiatior heat transfer is negligible. Determine the rate of heat transfer to the iced water in the tank. room 25°0c T. Iced water 0...
2.- In the inspection of a sample of meat intended for human consumption, it was found that certain undesirable organisms were present. In order to make the meat safe for consumption, it is ordered that the meat be kept at a temperature of at least 121°C for a period of at least 20 min during the preparation. Assume that a 2.5-cm- thick slab of this meat is originally at a uniform temperature of 27°C; that it is to be heated...
Q. 4: (20 pts) A1-mm-thick copper plate (k = 386 W/m - °C) is sandwiched between two 5-mm-thick epoxy boards (k = 0.26 W/m - °C) that are 15 cm 20 cm in size. If the thermal contact conductance on both sides of the copper plate is estimated to be 6000 W/m °C, determine the error involved in the total thermal resistance of the plate if the thermal contact conductances are ignored. Copper Epoxy ( Epoxy Dh Heat flow
Consider a 4 m high, 6 m wide and 0.17 m thick wall whose thermal conductivity is k = 0.8 W/m.oC. On a certain day, the temperatures of the inner and the outer medium close to the wall are measured to be 14oC and 6oC, respectively. Both inner and outer surfaces are subjected to convection heat transfer. Assume that the convection heat transfer coefficient is the same for the two surfaces h = 5 W/m2 ∙ °C. 1. Draw the...
summarizr the followung info and write them in your own words and break them into different key points. 6.5 Metering Chamber: 6.5.1 The minimum size of the metering box is governed by the metering area required to obtain a representative test area for the specimen (see 7.2) and for maintenance of reasonable test accuracy. For example, for specimens incorporating air spaces or stud spaces, the metering area shall span an integral number of spaces (see 5.5). The depth of...
summatize the following info and break them into differeng key points. write them in yojr own words apartus 6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...