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 ... the HVAC designer is enthalpy, particularly the enthalpy of evaporation, or the latent heat of vaporization h fg . This is the amount of heat, in Btu per pound, which Design Procedures: Part ... 145 Chapter 6 Design Procedures: Part 4 Fluid-Handling Systems 6. 1 Introduction All air-handling units (AHUs) and many terminal units,...

HVAC Systems Design Handbook part 8

... as given at the website. Design Procedures: Part 6 243Figure 8.25Wheatstone bridge.Figure 8. 26 Bridge circuit with calibration and set point. Design Procedures: Part 6 Downloaded from Digital ... the website. Design Procedures: Part 6 247Figure 8.30Flow versus plug lift in a control valve.Figure 8.31Coil heating capacity versus hot water ﬂow rate. Design Procedures: Part 6 Downloaded ... proportional to thechange in resistance. A basic bridge controller (Fig. 8. 26) includes a Design Procedures: Part 6 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)Copyright...

HVAC Systems Design Handbook part 7

... website.191Chapter7 Design Procedures: Part 5Central Plants7.1 IntroductionThe design and construction of central plants for heating and coolingis one of the most challenging and interesting aspects of the HVAC design ... plant, trafﬁc, noise, and emis-sions from the more densely populated areas.Source: HVAC Systems Design Handbook Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)Copyright ... 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 fullyDesign...

HVAC Systems Design Handbook part 9

... aircraftwhere light weight and simplicity are important. Thermoelectric re-Source: HVAC Systems Design Handbook Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)Copyright ... although 8 to 10ЊF is common for vapor compression systems and 15 to 20ЊF is common for absorption systems. The approach is theEquipment: Part 1Downloaded from Digital Engineering Library @ ... wet-bulb (wb) temperature. This is usually between 6 and 12ЊF, with 7 to 10ЊF being typical.9 .6. 1 Open-circuit cooling towersIn Figs. 9.14, 9.15, and 9. 16, there is only one water circuit, with aportion...

HVAC Systems Design Handbook part 10

... website.321Chapter10Equipment: Part 2Heating10.1 IntroductionHeating is the ﬁrst word in the acronym HVAC. It is the most impor-tant part because without heating mankind would have difﬁculty insurviving. Proper design ... other source, such as a process, an incinerator, or re-frigeration equipmentSource: HVAC Systems Design Handbook Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)Copyright ... conditionsin the combustion chamber.10 .6. 6 ControlsControls for automatic fuel-burning equipment range from simple two-position on/ off controls to full modulating systems which measure ﬂuegas temperatures...

HVAC Systems Design Handbook part 11

... follows:31min 1ft 1h 1lbw⌬w ϭ 30,000 Btu/h ϫϫ ϫϫ35555 ft 0.075 lb 60 min 1059 Btuaϭ 0.0011 lb /lb (11.2)waSource: HVAC Systems Design Handbook Downloaded from Digital Engineering Library @ McGraw-Hill ... Association, Exhaust Systems for Air Conveying of Vapors,Gases Mists and Non-Combustible Particulate Solids, NFPA 91-1999.2. Fundamentals Governing the Design and Operation of Local Exhaust Systems, Amer-ican ... components se-lected by the designer. This allows the designer complete ﬂexibility ofsize and arrangement. The built-up AHU tends to have a higher ﬁrstEquipment: Part 3Downloaded from Digital...

HVAC Systems Design Handbook part 12

... website.4 06 Chapter Twelve1. UPS systems may be a useful, even required component of a critical HVAC service and will be included in the HVAC and electric system design. 2. UPS systems themselves ... 220– 180240 252– 228 230 253– 207480 504– 4 56 460 5 06 4142300 2415–2185 2200 2420–19804 160 4370–3950 4000 4400– 360 012.4 Power FactorIn ac systems where the voltage is constantly changing ... over into plant design considerations.12.11 Lighting Systems Lighting design ranges from following a cookbook to a high-level artform. It is not the responsibility of the HVAC designer, but lightingimposes...

HVAC Systems Design Handbook part 13

... identiﬁed as being ofparamount importance to the relationship between owner and con-Source: HVAC Systems Design Handbook Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)Copyright ... science, but it can andmust be mastered by HVAC system designers. The drawings and spec-iﬁcations complement each other, complete the design, and are part ofthe legally binding commitment of ... contractor for required work.References1. ASHRAE Handbook, 2001 Fundamentals, Chap. 36, ‘‘Abbreviations and Symbols.’’2. ASHRAE Handbook, 1999 HVAC Applications, Chap. 38, ‘‘Computer Applications.’’3....

HVAC Systems Design Handbook part 14

... project designer.14.2 Participation during ConstructionDesigner participation during construction and beyond varies greatlywith design ofﬁce practice and with the owner’s desires. Some design ofﬁces ... during construction, relieving the design ofﬁce of any possible in-volvement, except to clarify a conﬂict in documents or a design error.Source: HVAC Systems Design Handbook Downloaded from Digital ... building and its systems. 14.3.3 Observation of operationMany speciﬁcations require the HVAC contractor to certify in writingthat the HVAC systems and controls are operating as designed andspeciﬁed....

Tài liệu HVAC Systems Design Handbook part 15 pptx

... value of the ﬁnal report will re-late strongly to the clarity of this deﬁnition.Source: HVAC Systems Design Handbook Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)Copyright ... 439Chapter15Technical Report Writing15.1 IntroductionAn HVAC designer is almost certain to be faced with the need to writereports. The ability to produce ... FifteenFigure 15.3Report organization. Note that ﬁgures and tables for each part of the reportgo behind the text for that part. techniques. Almost any binding system which delivers a neat and de-sirable...

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