Lab3-Case Study - Heat Transfer
docx
keyboard_arrow_up
School
University of Illinois, Urbana Champaign *
*We aren’t endorsed by this school
Course
224
Subject
Industrial Engineering
Date
Feb 20, 2024
Type
docx
Pages
5
Uploaded by JusticePheasantMaster654
House Structure Specifications (Total floor area: 1540 ft
2 = 143 m
2
)
:
1.
Floor to ceiling height: 9 ft = 2.74m; Crawling space has an average temperature 10
o
C;
2.
Windows: 3x5 ft (WxH) per unit except Living room Windows 3x6 (WxH). All with double glass; 3.
Doors: 3x7 ft (WxH) per unit; 4.
Covered porch and garage are considered as outside;
5.
Average outside t
o
= -6
o
C, φ
o
= 80%; Room t
i
= 22
o
C, φ
i
= 30%.
The upgraded structure includes additional insulation, air tightness. See Table below. Find:
1.
What’s the heating bill the month of January, if heat (nature gas) is 3¢ per kWh?
2.
What’ percentage of energy saving for the upgraded house compared with the typical?
3.
Food for thought (Optional): How long for the return of investment of upgrade if the added insulation cost $1.5/m
2
for ceiling, $15/m
2 for floor and $5/m for perimeter? Insulation and air exchange for Typical and Upgraded Structures:
Components
Typical
Upgraded
Wall, R15, total RSI (m
2
C/W)
3.07
3.07
Ceiling, with a total RSI (m
2
C/W)
3.65
7.2
Floor, particle board (with a Crawling Space at 10 C) (m
2
C/W)
0.776 (1” PE
insulation)
3.05 (insulation)
Perimeter insulation value, F (W/mC)
1.42
0.42
Windows
0.5
0.5
Doors
0.5
0.5
Air leakage (air change per hour)
1
0.5
Suggestion:
In calculating heat loss in a typical January: First, split the class into even number of teams. Half of team(s) works on the calculations for a Typical
house and the other half work on the Upgraded
house. First, each team works together to calculate perimeters, reasonable estimations are acceptable. Then among the team members, you may divide different tasks such as the following:
1.
Heat loss through walls, windows and doors, 2.
Heat loss through ceiling, floor and perimeters
Case Study: Improve Energy Efficiency for a Building
3.
Heat loss through air leakage
4.
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
Monthly and Seasonal Mean Temperature in Central Illinois
M O N T H / S E A S O N
T E M P E R A T U R E ( F )
P R E C I P I T A T I O N ( I N )
January
26.3
2.12
February
30.8
2.11
March
41.1
2.98
April
52.4
3.80
May
62.5
4.62
June
71.8
4.20
July
75.3
4.05
August
73.5
3.60
September
65.9
3.24
October
54.1
3.26
November
42.5
3.47
December
29.9
2.74
Winter
29.0
6.97
Spring
52.0
11.40
Summer
73.5
11.85
Fall
54.2
9.97
Annual
52.2
40.20
Free download Energy Design Guide, see next page and visit http://www.ashrae.org/publications/page/1604
Advanced Energy Design Guides Free Download
The Advanced Energy Design Guide
series provides a sensible approach to easily achieve advanced levels of energy savings without having to resort to detailed calculations or analysis.
The four-color guides offer contractors and designers the tools, including recommendations for practical products and off-the-shelf technology, needed for achieving a 30% energy savings compared to buildings that meet the minimum requirements of ANSI/ASHRAE/IESNA Standard 90.1-1999.
The energy savings target of 30% is the first step in the
process toward achieving a net-zero energy building, which is defined as a building that, on an annual basis, draws
from outside resources equal or less energy than it provides using on-site renewable energy sources.
These guides have been developed through the collaboration of ASHRAE, the American Institute of Architects (AIA), the Illuminating Engineering Society of North America (IESNA), and the U.S. Green Building Council (USGBC),
with support from the Department of Energy (DOE), to help meet all of an owner’s energy performance requirements. In an effort to promote building energy efficiency, ASHRAE and its partners have made these guides available for download (PDF) at no charge.
For these categories of buildings:
K-12 School Buildings For elementary, middle, and high school buildings, which have a wide variety of heating and air-
conditioning requirements. Options for daylighting, an important component in schools, are included.
I-P units. Small Retail Buildings For retail buildings up to 20,000 ft
2
, the bulk of retail space in the U.S. Addresses typical uses: retail (other than shopping malls); strip shopping centers; automobile dealers; building material, garden supply, and hardware stores; department stores; drugstores; equipment and home furnishing stores; liquor stores; and wholesale goods (except food). I-P units. Small Office Buildings For office buildings up to 20,000 ft
2
the bulk of office space in the U.S.; and provides benefits and savings for
the building owner while maintaining quality and functionality of the office space. Awards: USGBC 2005 Leadership Award; Stars of Energy Efficiency Award, Honorable Mention (Alliance to Save Energy); and Best Sustainable Practice Award, Honorable Mention (SBIC). I-P units.