A prospective client attending the forum has requested consultancy services. You have requested the specifications of the system and the client informs you that the exterior walls of a building are a composite consisting of 12mm thick plaster board, 52mm thick urethane foam, and 12mm thick soft wood. On a typical winter day, the outside and inside air temperatures are -14°C and 23°C respectively. The outer and inner convection coefficients are 15W/mK and 5W/mK respectively. c) Calculate the heating loss for a 1m² section of the wall. d) What is the heating loss if the composite wall is replaced by a window consisting of two 3.5mm thick glass panes separated by a 5mm thick stagnant air gap. State simplifying assumptions. Use the following thermal conductivity values: Plaster board, kp = 0.17 W/mK Urethane foam, k = 0.026 W/mK Wood, Kw = 0.12 W/mK Glass, kg = 1.4 W/mK Air, ka = 0.0263 W/mK

A prospective client attending the forum has requested consultancy services. You have requested the specifications of the system and the client informs you that the exterior walls of a building are a composite consisting of 12mm thick plaster board, 52mm thick urethane foam, and 12mm thick soft wood. On a typical winter day, the outside and inside air temperatures are -14°C and 23°C respectively. The outer and inner convection coefficients are 15W/mK and 5W/mK respectively. c) Calculate the heating loss for a 1m² section of the wall. d) What is the heating loss if the composite wall is replaced by a window consisting of two 3.5mm thick glass panes separated by a 5mm thick stagnant air gap. State simplifying assumptions. Use the following thermal conductivity values: Plaster board, kp = 0.17 W/mK Urethane foam, k = 0.026 W/mK Wood, Kw = 0.12 W/mK Glass, kg = 1.4 W/mK Air, ka = 0.0263 W/mK

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

### Given the resolution of the problem 5.102 below, develop a python program that shows the found temperature distribution PROBLEM 5.102 KNOWN: Fuel element of Example 5.8 is initially at a uniform temperature of 250°C with no internal generation; suddenly a uniform generation, q = 10³ W/m³, occurs when the element is inserted into the core while the surfaces experience convection (To,h). FIND: Temperature distribution 1.5s after element is inserted into the core. SCHEMATIC: PROBLEM 5.102 (Cont.) To be well within the stability limit, select At = 0.3s, which corresponds to Fo aAt 5x10 m²/sx0.3s 4x² t=pAt=0.3p(s). =0.375 (0.002m)² Fuel element- x=5x10 m²/s k-30W/m-K Coolant Too-250°C h-1100 W/m²-K رجا T(x,0)=250°C 9-10°W/m³ at +>0 Coolant Too,h L-10mm k+ax=2mm ASSUMPTIONS: (1) One-dimensional transient conduction, (2) Constant properties, (3) q=0, initially; at t> 0, q is uniform. ANALYSIS: As suggested, the explicit method with a space increment of 2mm will be used. Using the nodal…
John is employed by a new food processing plant where eggs are to be boiled in large quantities to produce egg salad. John has been assigned the task of determining the minimum cooking time for the eggs, utilizing his vast knowledge of heat transfer. As a basis of calculation, he assumed that the eggs are perfect spheres with a diameter of 5 cm and uniform material properties (r =1000kg/m'; Cp = 3300 J/(kg K) and k=0.75 W/(m-K)). The eggs were taken from a cold storage room at 5°C and immediately put into pots of boiling water at 100°C. The convective heat transfer coefficient of the water is h = 1500 W/m°K. For health safety reasons, the plant requires that the entire egg must be at a temperature above 75°C for at least 20 seconds in order for the cooking process to be complete. a. What is the minimum time necessary to cook the egg to company specifications? b. In the testing lab, John forgot to remove a batch of eggs, and they remained in the cooking pot long enough to reach a…
I need help on 2b
Can someone please help me to solve all of the following question showing all work and explanation as well as graphs needed in excel with formulas. Thank you!
Show the thermal circuit by labeling all the thermal resistances. Calculate and tabulate the thermal resistances (assume Tavg=470 K for the air gaps). If q''rad= 0.25W/cm^2, what is the outer surface temperature of turnout coat for inner temperature of 66C.
= 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.
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