ZieaeuAadousaues:erausi92 Heat of Respiration of a Food Product. A fresh-food product is held in cold stor-age at 278.0 K. It is packed in a container in the shape of a flat slab with all facesinsulated except for the top flat surface, which is exposed to the air at 278.0 K. Forestimation purposes, the surface temperature will be assumed to be 278 K. The slabis 152.4 mm thick and the exposed surface area is 0.186 m2. The density of the food-stuff is 641 kg/m2. The heat of respiration is 0.070 kJ/kg h and the thermal conduc-tivity is 0.346 W/m K. Calculate the maximum temperature in the food product atsteady state and the total heat given off in W. (Note: It is assumed in this problemthat there is no air circulation inside the foodstuff. Hence, the results will be conser-vative, since circulation during respiration will reduce the temperature.)/11

Calculate the maximum temperature of the food product at steady state.

Answered: Ziea euA adousaues: erau si 9 2 Heat of…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Heat transfer
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). The sun is the only source of heat and the ice absorbs a mean of 98 J/m2-s, 12.5 hrs per day. The exposed area for heating is 250 km x 50 km and the density is 920 kg/m3. What is the total mass of the iceberg? Express answer in kg and in scientific notation with two decimal places.
(a) In thermal systems design projects various cost estimation methods can be followed depending on the nature of the project. Discuss at least four costing methods that can be applied in the thermal systems design and compare the strength and weakness of each method. (minimum 250 words). (b) Which method of costing do you think is appropriate for your thermal system design project? Discuss your justifications why you prefer the particular cost estimation method. (c) In the design process of air conditioning systems discuss the key steps you should carry out before production and installation of the system.
Sepleniber 02 Heat is generated in a homogeneous spherical piece of radioactive material (2D - 8 cm) at rate of 71.8 MW/m and is dissipated to the environment. The center and surface temperatures of the spheres are (491°C and 80°C) respectively, What is the thermal conductivity of the radioactive material "W/m.K"?
= A long rod of 60-mm diameter and thermophysical properties p 8000 kg/m³, c C = 500 J/kg-K, and k = 50 W/m-K is initially at a uniform temperature and is heated in a forced convection furnace maintained at 750 K. The convection coefficient is estimated to be 1000 W/m².K. What is the centerline temperature of the rod when the surface temperature is 570 K? The centerline temperature of the rod is i K.
Small potato balls of 0.5 cm radius (can be approximated as a sphere) baked in the oven and initially at a uniform temperature of 160°C. Assume, potatoes have a density of 650 kg/m, specific heat of 3400 J/kgK and conductivity of 1 W/mK. You want to eat potatoes quickly without burning your tongue so that you have decided to cool them down with forced convection. Air h, T. hot potato initially Air temperature is 20°C and the convective heat transfer coefficient is 140 W/m?K. Calculate the time (in seconds) required for its surface temperature to drop 90°C.
A very long stick, 5 mm in diameter, has one of its ends. maintained at 70 °C. The surface of the stick is exposed to ambient air at 20 °C, with a convection heat transfer coefficient of 88 W/(m2K). a)Determine the equation of temperature distribution across rods constructed of AISI 316 stainless steel. What are the calorie losses in the rods? B) Estimate how long the rods should be for the infinite length hypothesis to provide an accurate estimate of heat los
Air has a very low thermal conductivity. This explains whywe feel comfortable wearing short sleeves in a 20°C environment eventhough our body temperature is 37°C. Material objects feel cooler to ourimmediate touch than the air, owing to relatively high thermal conductivities.(a) Touch a few surfaces in a room-temperature environment andrank them in order of which feel the coolest to which feel the warmest.Objects that feel cooler have larger thermal conductivities. Consider awood surface, a metallic surface, and a glass surface, and rank these inorder from coolest to warmest
Heat transfer
The rear window of an automobile is defogged by passing warm air over its inner surface. If the warm air is at Ti = 40°C and the = 30 W/m2-K, what are the inner and outer surface temperatures, in °C, of 4-mm-thick corresponding convection coefficient is h; window glass, if the outside ambient air temperature is To = -15°C and the associated convection coefficient is h, = 65 W/m²-K? o,0 Evaluate the properties of the glass at 300 K. Tsi i °C Ts,0 i °C

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