HVAC Systems Design Handbook doc
HVAC Systems Design Handbook part 6
... For design
purposes, this value can be used without significant error. The density
of water varies from 62 .3 lb/ft
3
at 70ЊF to 60 .1 lb/ft
3
at 200ЊF. Fo r
HVAC design purposes, the value of 62 .3 ... Terms of Use as given at the website.
Design Procedures: Part 4 181
Figure 6. 27
Backward-curved pump impeller.
6. 7 Pumps
Centrifugal pumps are used in HVAC systems for circ...
HVAC Systems Design Handbook part 8
... website.
223
Chapter
8
Design Procedures: Part 6
Automatic Controls
8. 1 Introduction
HVAC systems are sized to satisfy a set of design conditions, which
are selected to generate a maximum load. Because these design ... the website.
Design Procedures: Part 6 247
Figure 8. 30
Flow versus plug lift in a control valve.
Figure 8. 31
Coil heating capacity versus hot water flow...
HVAC Systems Design Handbook part 7
... the systems described are given in Figs. 7. 17,
7. 18, and 7. 19. These are simple block diagrams to illustrate the con-
cepts. Design of complete plants requires the development of a fully
Design ... another
discussion. The HVAC systems designer will recognize plants as po-
tential areas of specialty experience as assignments and interest allow.
References
1. ASHRAE Handbook, 2...
HVAC Systems Design Handbook part 9
... at the website.
Equipment: Part 1 3 09
Figure 9. 22
Partial section
through a finned coil.
Figure 9. 23
Heat transfer through a tube wall.
that area may look good to the designer, but the system won’t ... Air Con-
ditioning, July 198 7, p. 67.
2. Cooling-Tower Fundamentals, The Marley Cooling Tower Co., 199 8, Mission, KS.
3. ASHRAE Handbook, 2001 Fundamentals, Chap. 19, ‘‘Refrigerants,’...
HVAC Systems Design Handbook part 10
... website.
Equipment: Part 2 355
Figure 10. 29
Psychrometric chart for Fig. 10. 28, without heat recovery.
Figure 10. 30
Psychrometric chart for Fig. 10. 28, with heat recovery.
Equipment: Part 2
Downloaded ... replaced.)
5. ASHRAE Handbook, 2000 HVAC Systems and Equipment, Chap. 6, ‘‘Panel Heating
and Cooling.’’
6. ASHRAE Handbook, 1999 HVAC Applications, Chap. 32, ‘‘Solar Ener...
HVAC Systems Design Handbook part 11
... 1lb
w
⌬w ϭ 30,000 Btu/h ϫϫ ϫϫ
3
5555 ft 0.075 lb 60 min 1059 Btu
a
ϭ 0.0 011 lb /lb (11. 2)
wa
Source: HVAC Systems Design Handbook
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)
Copyright ... hoods and exhaust systems. Laboratory
and industrial fume hoods require large exhaust air quantities. Sev-
eral standards cover the design of s...
HVAC Systems Design Handbook part 12
... given at the website.
397
Chapter
12
Electrical Features
of HVAC Systems
12. 1 Introduction
While most HVAC designers will have the support of a competent elec-
trical design staff, it is important ... of remote origin. The
HVAC designer must work closely with the electrical designer to sat-
isfy the needs of both disciplines.
12. 13 Summary
In building construction, HVAC des...
HVAC Systems Design Handbook part 13
... Use as given at the website.
411
Chapter
13
Design Documentation:
Drawings and Specifications
13. 1 Introduction
Design documents evolve from and include the designer’s calculations,
equipment selections, ... product.
13. 3.9 Use of computers in drafting
The use of computers in design, drafting, and specification writing has
proliferated in recent years.
2
Computer-aided design and d...
HVAC Systems Design Handbook part 14
... project designer.
14. 2 Participation during Construction
Designer participation during construction and beyond varies greatly
with design office practice and with the owner’s desires. Some design
offices ... building and its systems.
14. 3.3 Observation of operation
Many specifications require the HVAC contractor to certify in writing
that the HVAC systems and controls are operatin...
Tài liệu HVAC Systems Design Handbook part 18 docx
... website.
459
Chapter
18
Engineering Fundamentals:
Part 3
Heat Transfer
18. 1 Introduction
This chapter presents a basic overview of heat transfer fundamentals,
particularly as they apply to HVAC. For a ... is used, or for absolute temperatures the Rankine (ЊR) scale:
ЊR ϭ ЊF ϩ 460Њ.
Source: HVAC Systems Design Handbook
Downloaded from Digital Engineering Library @ McGraw-Hill (w...
Tài liệu HVAC Systems Design Handbook part 19 doc
... temperature.
19. 5 HVAC Processes on the
Psychrometric Chart
Any HVAC process may be plotted on the chart if the end state points
are known and sometimes if only the beginning state point is known.
19. 5.1 ... Every set of HVAC design calculations
should include one or more psychrometric charts, reflecting the antic-
ipated performance of the system being designed.
References
1. ASHR...
Tài liệu HVAC Systems Design Handbook part 21 doc
... responsibility
of the architect, but the HVAC designer must be aware of conditions
that might lead to problems, such as mold, which might be aggravated
or alleviated by HVAC design.
21. 2 Negative Effects of ... responsibility resides with the designer. This book has dis-
cussed all of the facets of designing a good HVAC system, but we have
not talked about the other influences on air...
Tài liệu HVAC Systems Design Handbook part 3 docx
... Tables 3. 6 through 3. 13, pp. 38 –42. The lighting-related load
is particularly affected by the type of fixture and ventilation rate of
the air conditioning system, as indicated in Table 3. 6.
The ... subject to the Terms of Use as given at the website.
Design Procedures: Part 1 35
Heat gain from lights is a function of wattage, at a rate of 3. 4 13
Btu/h/W. For fluorescent lightin...
Tài liệu HVAC Systems Design Handbook part 5 docx
... 8
7 151 210 8
7 .5 19 13 — 9
8 22 151 1—
8 .5 18 13 11 10
9 201412—10
9 .5 21 18 14 12 —
10 19 15 13 11
10 .5 21 17 15 13 12
11 19 16 14 — 12
11 .5 20 18 16 14 —
12 23 20 17 15 13
12 .5 25 21 — — 15 14
13 ... 28 23 19 17 16 — 14
13 .5 30 — 21 18 — 16 —
14 33—22201817 15
14 .5 36 — 24 22 19 — 17
15 39—2723211918
16 45 — 30 — 24 22 20 17
17 52 — 35 — 27 24 21 19
18 59 — 39 —...
HVAC Systems Design Handbook doc
... objective. What is the end result desired? For HVAC
the objective usually is to provide an HVAC system which will control
Source: HVAC Systems Design Handbook
Downloaded from Digital Engineering ... impact on the design of HVAC
systems.
Particular codes are sufficiently diverse in their adoption and im-
plementation that it is unwise for this book to list any specifics. The
H...