Architectural Engineering

Architectural engineering

Name

Institutional Affiliation

Fundamentals of building performance

Question 1

Commercial building, metal framed, constructed in Denver, Colorado.

a. Climate zone of Denver, Colorado;

According to International energy conservation code 2009, Table 301.1 categorises

Denver, Colorado climate zone as 5B. Dry (B) climate and not marine with P

< 0.44 x (TF –

19.5) [P

ern

<2.0 x (TC +7) in 51 units].

 Where P

is the annual precipitation in inches(em) and

 T is the annual mean temperature (OC).

Zone number 5 also has a thermal criterion: IP Units of 5400 <HDD65

P≤ 7200 and 51

Units of 3000 <HDD18

C ≤ 4000. For 51

C=[(OF)-32/1.8

b. All other category, R values for opaque envelopes: Roof and Above Grade Walls

For Roofs

Since Colorado is climate zone 5;

 Insulation above deck: R-20ci

 Metal Buildings having R-5 thermal blocks: R-13 + R-13

 Attic and other: R-38

Above grade Walls

 Mass: R-11.4ci

 Metal building

R-13 + R-S.6ci

 Metal framed: R-13 + R-S.6 ci

 Wood framed and other: R-13 + R-7.5ci

Where ci= continuous insulation.

c. Roof assembly and above grade wall assembly

R-13+R-13, Faced fiberglass insulation batts draped over purlins and R-13+R-S.6ci

installed faced fiberglass insulation batts

Surfacing

Purlins

Faced fibreglass Insulation

(U=0.22)

R-5 Thermal blocks

Metal deck

(U=0.12)

Roof Assembly

R-Values

Brick Wall

0.44

2.75” Air gap

0.01

2” Fibre glass

6.40

8” Concrete

1.11

Total R Value

7.96

U Factor=1/R=0.126

 Zone 5 R49- R60 uninsulated attic: 3-4 inches of insulation R38-49

 Wall insulation zone 5: R5-R-6 insulated sheathing before new siding

Question 2

a. If stack cooling is enough

Wall Assembly

Brick Wall (U=0.44)

2.75 “Air gap (U=0.97)

2” R-11.4 fibreglass

insulator (U=8.00)

8” concrete masonry

unit (CMU)(U=0.44)

Atrium height=50 ft.

Stack/floor area =30% =0.30

Stack area=2000 ft

Building cooling load=400, 000 Btu/hr

 





 







6666.6667 ft

  

  



  



Q=A x DCLF

DCLF=18 (85

F facing North)

Q=6666.6667 x 18=120, 000Btu.h

Btu/hr needed=120, 000Btu/h

The stack cooling is not enough since it has a lower Btu/hr as compared to the building

cooling load.

b. Cooling electricity saved

 









Where h

is the produced heat and h

electric energy input.









 

     





Excess cooling load needed =280,000 Btu/hr





 





    

Electricity saved= 840,000 – 400,000= 440,000 Btu/hr

Question 3

A rectangular duct:

Dimension 12inch by 16 inch

Air velocity: (810 fpm, 820fpm ,805fpm, 812fpm, 902fpm)

Flow rate in the air duct in cfm

  







Where a

is the air duct length, and b

is the air duct width.

    







          



 





  

   

Therefore,

  



  



Where 0.00694444 is the conversion factor

  



  

References

International energy conservation code 2009. (2009). Country Club Hills, IL: International

Code Council.

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