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If you have a room (10*7*3.5m) and you have 2 solar windows (the dimension of the window (2.5*2m)) located in the largest wall and the solar gain of them 1.5 kW/day and you have a door (1.6*2.5 m) in the northern wall and the temperature inside = 21°c and the average temperature outside = 10°C and the natural air change 0.9 time %3D /hour/day and the characteristics of materials are shown in the table below

If you have a room (10*7*3.5m) and you have 2 solar windows (the dimension of the window (2.5*2m)) located in the largest wall and the solar gain of them 1.5 kW/day and you have a door (1.6*2.5 m) in the northern wall and the temperature inside = 21°c and the average temperature outside = 10°C and the natural air change 0.9 time %3D /hour/day and the characteristics of materials are shown in the table below

Elements Of Electromagnetics
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
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If you have a room (10*7*3.5m) and you have 2 solar windows (the dimension of the window (2.5*2m)) located in the largest wall and the solar gain of them 1.5 kW/day and you have a door (1.6*2.5 m) in the northern wall and the temperature inside = 21°c and the average temperature outside = 10°C and the natural air change = 0.9 time /hour/day and the characteristics of materials are shown in the table below Elements U value Window 1.4 W/m.K Door 2.5 W/m.K South and North wall 0.5 W/m .K East and west wall 0.65 W/m .K Roof 0.45 W/m.K Floor 0.7 W/m .K If you know that you have 6 fixture lighting units of 50 W and the efficiency of them 70% and their runtime is 10 hours /day and there are 3 persons one of them is cooking and the two other are sleeping and they are present 4 hours/day and if you have the following appliance Appliance Running time Rotisserie 0.2 hour Large refrigerator 5 hours Blender 0.2 hour From your heat balance result decide if we will need a cooling or a heating system ?
Transcribed Image Text:If you have a room (10*7*3.5m) and you have 2 solar windows (the dimension of the window (2.5*2m)) located in the largest wall and the solar gain of them 1.5 kW/day and you have a door (1.6*2.5 m) in the northern wall and the temperature inside = 21°c and the average temperature outside = 10°C and the natural air change = 0.9 time /hour/day and the characteristics of materials are shown in the table below Elements U value Window 1.4 W/m.K Door 2.5 W/m.K South and North wall 0.5 W/m .K East and west wall 0.65 W/m .K Roof 0.45 W/m.K Floor 0.7 W/m .K If you know that you have 6 fixture lighting units of 50 W and the efficiency of them 70% and their runtime is 10 hours /day and there are 3 persons one of them is cooking and the two other are sleeping and they are present 4 hours/day and if you have the following appliance Appliance Running time Rotisserie 0.2 hour Large refrigerator 5 hours Blender 0.2 hour From your heat balance result decide if we will need a cooling or a heating system ?
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