Ansi Ashrae Addenda D E F And G To Ansi Ashrae Standard-Books Pdf

ANSI ASHRAE Addenda d e f and g to ANSI ASHRAE Standard
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2009 American Society of Heating Refrigerating and Air Conditioning Engineers Inc www ashrae org For personal use only. Additional reproduction distribution or transmission in either print or digital form is not permitted without ASHRAE s prior written permission. ASHRAE Standing Standard Project Committee 55, Cognizant TC TC 2 1 Physiology and Human Environment. SPLS Liaison Robert G Doerr, Stephen C Turner Chair K Ogzem Ornektekin. Alison G Kwok Vice Chair Michael P O Rourke, Brian M Lynch Secretary Gwelen Paliaga. Edward A Arens Nicholas B Rajkovich, Richard M Aynsley Chandra Sekhar. Gail S Brager Peter Simmonds, Joseph J Deringer Jerry M Sipes.
Sahar Abbaszadeh Fard Elia M Sterling, Julie M Ferguson John L Stoops. John M Filler Jr Lawrence J Schoen, Thomas B Hartman Benjamen P Sun. Jaap J Hogeling Steven T Taylor, Daniel Int Hout III Robert W Tinsley. Hal Levin Jorn Toftum, Denotes members of voting status when the document was approved for publication. ASHRAE STANDARDS COMMITTEE 2008 2009, Hugh F Crowther Chair Jay A Kohler.
Steven T Bushby Vice Chair Carol E Marriott, Robert G Baker Merle F McBride. Michael F Beda Frank Myers, Donald L Brandt H Michael Newman. Paul W Cabot Janice C Peterson, Kenneth W Cooper Douglas T Reindl. Samuel D Cummings Jr Lawrence J Schoen, K William Dean Boggarm S Setty. Martin Dierycxk Bodh R Subherwal, Robert G Doerr William F Walter.
Allan B Fraser Michael W Woodford, Nadar R Jayaraman David E Knebel BOD ExO. Byron W Jones Andrew K Persily CO, Stephanie Reiniche Manager of Standards. SPECIAL NOTE, This American National Standard ANS is a national voluntary consensus standard developed under the auspices of the American Society. of Heating Refrigerating and Air Conditioning Engineers ASHRAE Consensus is defined by the American National Standards Institute ANSI. of which ASHRAE is a member and which has approved this standard as an ANS as substantial agreement reached by directly and materially. affected interest categories This signifies the concurrence of more than a simple majority but not necessarily unanimity Consensus requires. that all views and objections be considered and that an effort be made toward their resolution Compliance with this standard is voluntary until. and unless a legal jurisdiction makes compliance mandatory through legislation. ASHRAE obtains consensus through participation of its national and international members associated societies and public review. ASHRAE Standards are prepared by a Project Committee appointed specifically for the purpose of writing the Standard The Project. Committee Chair and Vice Chair must be members of ASHRAE while other committee members may or may not be ASHRAE members all. must be technically qualified in the subject area of the Standard Every effort is made to balance the concerned interests on all Project Committees. The Assistant Director of Technology for Standards and Special Projects of ASHRAE should be contacted for. a interpretation of the contents of this Standard, b participation in the next review of the Standard. c offering constructive criticism for improving the Standard or. d permission to reprint portions of the Standard, DISCLAIMER.
ASHRAE uses its best efforts to promulgate Standards and Guidelines for the benefit of the public in light of available information and. accepted industry practices However ASHRAE does not guarantee certify or assure the safety or performance of any products components. or systems tested installed or operated in accordance with ASHRAE s Standards or Guidelines or that any tests conducted under its. Standards or Guidelines will be nonhazardous or free from risk. ASHRAE INDUSTRIAL ADVERTISING POLICY ON STANDARDS, ASHRAE Standards and Guidelines are established to assist industry and the public by offering a uniform method of testing for rating. purposes by suggesting safe practices in designing and installing equipment by providing proper definitions of this equipment and by providing. other information that may serve to guide the industry The creation of ASHRAE Standards and Guidelines is determined by the need for them. and conformance to them is completely voluntary, In referring to this Standard or Guideline and in marking of equipment and in advertising no claim shall be made either stated or implied. that the product has been approved by ASHRAE, 2009 American Society of Heating Refrigerating and Air Conditioning Engineers Inc www ashrae org For personal use only. Additional reproduction distribution or transmission in either print or digital form is not permitted without ASHRAE s prior written permission. This foreword is not part of this standard It is merely The ranges of operative temperatures presented in. informative and does not contain requirements necessary Figure 5 2 1 1 are for 80 occupant acceptability This is. for conformance to the standard It has not been based on a 10 dissatisfaction criterion criteria for general. processed according to the ANSI requirements for a whole body thermal comfort based on the PMV PPD index. standard and may contain material that has not been plus an additional 10 dissatisfaction that may occur on. subject to public review or a consensus process average from local partial body thermal discomfort. Unresolved objectors on informative material are not Appendix D provides a list of inputs and outputs used in the. offered the right to appeal at ASHRAE or ANSI PMV PPD computer program to generate these graphs. This addendum allows air speed to be used efficiently to Elevated air Air speeds greater than 0 20 m s 40 ft min. cool people indoors as a way to improve comfort In certain may be used to increase the upper operative temperature limit. combinations of temperature ranges and personal factors the for the comfort zone in certain circumstances Section 5 2 3. preference for more air movement is greater than it is for less describes these adjustments and specifies the criteria required. air movement The standard currently allows modest increases for such adjustments. in operative temperature beyond the PMV PPD Computer Revise Section 5 2 1 2 as shown below. Model Method in the standard limits as a function of air. speed and turbulence intensity But field studies including 5 2 1 2 Computer Model Method for General Indoor. recently published work show that occupants especially Application The method in this section may be applied to. when neutral or slightly warm prefer higher air speeds than spaces where the occupants have activity levels that result in. are currently allowed In this addendum new bases for select average metabolic rates between 1 0 and 2 0 met and where. ing these limits are provided and alternatives are given for clothing is worn that provides 1 5 clo or less of thermal insu. determining the boundaries of comfort at air speeds above lation See Appendix A for estimation of metabolic rates and. 0 15 m s 30 fpm Appendix B for estimation of clothing insulation. Note In this addendum changes to the current standard. are indicated in the text by underlining for additions and. Use of the PMV model in this standard is limited to air. strikethrough for deletions unless the instructions specifi. speeds below not greater than 0 20 m s 40 fpm Air speeds. cally mention some other means of indicating the changes. greater than this 0 20 m s 40 ft min may be used to increase. Addendum d to Standard 55 2004 the upper temperature limits of the comfort zone in certain. circumstances Section 5 2 3 describes the method these. Add and delete the following definitions in Section 3 of the adjustments and specifies the criteria required for such adjust. standard as shown below ments The adjustments in Section 5 2 3 are with respect to the. upper limit of the comfort zone determined with the PMV. adaptive model a model that relates indoor design tempera model using an air speed of 0 20 m s 40 fpm. tures or acceptable temperature ranges to outdoor meteorolog. ical or climatalogical climatological parameters Revise Section 5 2 3 as shown below Note that the current. Figure 5 2 3 has been deleted and a new Figure 5 2 3 1 has. draft rate DR percentage of people predicted to be dissat been added. isfied due to draft, 5 2 3 Elevated Air Speed Precise relationships between. temperature standard effective SET the temperature of an increased air speed and improved comfort have not been. imaginary environment at 50 RH 0 1 m s air speed and tr established However this This standard allows elevated air. ta in which the total heat loss from the skin of an imaginary speed to be used to increase the maximum operative temper. occupant with an activity level of 1 0 met and a clothing level ature for acceptability under certain conditions Limits are. of 0 6 clo is the same as that from a person in the actual envi imposed depending on environmental and personal factors. ronment with actual clothing and activity level and whether if the affected the occupants have local are able. turbulence intensity Tu the ratio of the standard deviation to control ofthe air speed. of the air speed SDv to the mean air speed v Turbulence 5 2 3 1 Graphical Method The amount that the tem. intensity may also be expressed in percent i e Tu SDv va perature may be increased is shown in Figure 5 2 3 5 2 3 1. 100 The combinations of air speed and temperature defined by the. velocity standard deviation SDv a measure of the scatter of lines in this figure result in the sameequal levels of heat loss. the instantaneous air velocity around the mean air velocity in a from the skin The reference point for these curves is the upper. frequency distribution defined as the square root of the arith air speedtemperature limit of the PMV defined comfort zone. metic average of a set of square values of the difference between PMV 0 5 and 0 20 m s 40 fpm as described in Section. the instantaneous air velocity and the mean air velocity The 5 2 1 2 of air speed This The figure applies to a lightly. standard deviation is based on individual values of air speed that clothed person with clothing insulation between 0 5 and 0 7. represent an average over no more than two seconds each clo who is engaged in near sedentary physical activity with. metabolic rates between 1 0 and 1 3 met The curves are gen. Revise the second and last paragraphs of Section 5 2 1 1 as erated by the SET thermophysiological model described in. shown below Section 5 2 3 2, ANSI ASHRAE Addenda d e f and g to ANSI ASHRAE Standard 55 2004 1.
2009 American Society of Heating Refrigerating and Air Conditioning Engineers Inc www ashrae org For personal use only. Additional reproduction distribution or transmission in either print or digital form is not permitted without ASHRAE s prior written permission. The indicated increase in temperature pertains to both the Under the Graphical Method the required air speed for. mean radiant temperature and the air temperature That is light primarily sedentary activities may not be higher than 0 8. both temperatures increase by the same amount with respect to m s 160 ft min although it may be higher when using the. the starting point When the mean radiant temperature is low SET Method in Section 5 2 3 2 below Elevated air speed may. and the air temperature is high elevated air speed is less effec be used to offset an increase in the air temperature and the. tive at increasing heat loss Conversely elevated air speed is mean radiant temperature but not by more than 3 0 C 5 4 F. more effective at increasing heat loss when the mean radiant above the values for the comfort zone without elevated air. temperature is high and the air temperature is low Thus the speed The required air speed may not be higher than 0 8 m s. curve in Figure 5 2 3 5 2 3 1 that corresponds to the relative 160 fpm Large individual differences exist between people. difference between air temperature and mean radiant temper with regard to the preferred air speed Therefore the elevated. ature must be used It is acceptable to interpolate between air speed must be under the direct control of the affected occu. curves for intermediate differences pants and adjustable in steps no greater than 0 15 m s 30 fpm. Figure 5 2 3 Air speed required to offset increased temperature. Figure 5 2 3 1 Air speed required to offset increased air and radiant temperatures. 2 ANSI ASHRAE Addenda d e f and g to ANSI ASHRAE Standard 55 2004. 2009 American Society of Heating Refrigerating and Air Conditioning Engineers Inc www ashrae org For personal use only. Additional reproduction distribution or transmission in either print or digital form is not permitted without ASHRAE s prior written permission. The benefits that can be gained by increasing air speed depend This model enables air velocity effects on thermal comfort to. on clothing and activity Due to increases in skin wettedness be related across a wide range of air temperatures radiant. the effect of increased air speed is greater with elevated activ temperatures and humidity ratios. ity than with sedentary activity Due to increased amounts of Figure 5 2 3 2 uses SET to extend the Figure 5 2 1 1. exposed skin the effect of increased air speed is greater with comfort zones across a range of air speeds for the example. lighter clothing Thus Figure 5 2 3 5 2 3 1 is conservative for humidity ratio of 0 010 Figure 5 2 1 1 is based on PMV calcu. activity levels above 1 3 met and or for clothing insulation less lated for 0 1 m s air speed 20 fpm The extension in Figure. than 0 5 clo and may be applied in these circumstances 5 2 3 2 was created in two steps The PMV model was first used. ANSI ASHRAE Addenda d e f and g to ANSI ASHRAE Standard 55 2004 1 This foreword is not part of this standard It is merely informative and does not contain requirements necessary for conformance to the standard It has not been processed according to the ANSI requirements for a standard and may contain material that has not been subject to public review or a consensus process Unresolved

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