Graphical expression of thermodynamic characteristics of absorption process in ammonia-water system

GRAPHICAL EXPRESSION OF THERMODYNAMIC CHARACTERISTICS OF ABSORPTION PROCESS IN AMMONIA-WATER SYSTEM JiĜí POSPÍŠIL1 and ZdenČk FORTELNÝ2 Abstract: The adiabatic sorption is very interesting phenomenon that occurs when vapor of refrigerant is in contact with unsaturated liquid absorbent-refrigerant mixture and exchange of heat is forbid between the system and an environment. This contribution introduces new auxiliary lines that enable correct position determination of the adiabatic sorption process in the p-T-x diagram of ammoniawater system. The presented auxiliary lines were obtained from common functions for fast calculation of water-ammonia system properties. Absorption cycles designers often utilize p-t-x diagrams of working mixtures for first suggestion of new absorption cycles. The p-t-x diagrams enable fast correct determination of saturate states of liquid (and gaseous) mixtures of refrigerants and absorbents. The working mixture isn’t only at saturated state during a real working cycle. If we know pressure and temperature of an unsaturated mixture, exact position determination is possible in the p-t-x diagrams too. 1. INTRODUCTION    !"# $%              %#&%'(  )  #            '   &&%$% # &&%          *    %     # &&%          +   ,     #%#%          &    -./00123$450$4+627$809:028; !<6$7:23$450$4+627$892""; EPJ Web of Conferences , 010 (2012) DOI: 10.1051/epjconf/201225010 © Owned by the authors, published by EDP Sciences, 2012 This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Article available at http://www.epj-conferences.org or http://dx.doi.org/10.1051/epjconf/20122501079 #% &&%&  2. MATHEMATICAL DESCRIPTION #                * & % C%       %    #  %        %   #  D # #-   )LJXUH,QOHWVDQGRXWOHWVRIWKHDGLDEDWLFDEVRUSWLRQSURFHVV  G#22%2H)IK2-2!      2  %   % D   H)I      *  -""L *O-P K %           &O-PO!POIP D%*      #      % %K2 % $%     % Q * %  -  *-   () 11111 TTchh p − ′ ⋅ ′ − ′ = -   G  R     * %   -  *%H)I** % C*      %   2 %% H)I  7   IS[  !   K   I7  [  I  EPJ Web of Conferences 01079-p.2  F S  I7  [  S    )LJXUH,WHUDWLYFDOFXODWLRQRIDGLDEDWLFVRUSWLRQVDWXUDWHVWDWH   *2 *%*% H)I      %        2    H)I   D   H)I               H)I2 ! 3*% T22H)I        ! #    % %ε #* 72 *   * %    H)IO-PU    V  EFM11 01079-p.3   7DEOH/LVWRISDUDPHWHUVIRUHTXLWDWLRQ   C*%*O-PU  i n i x T T ahh m i i ¦ ¸ ¸ ¹ · ¨ ¨ © §−= 1´ 0 0 W    7DEOH/LVWRISDUDPHWHUVIRUHTXLWDWLRQ   KO!P*% *U () OHNH ppp cxcxc 23 1′ ⋅−+ ′ ⋅= ′ X  1− ⋅+= ′ τ cpcpp BAc i Y  crit T T′ −≡1 τ Z   EPJ Web of Conferences 01079-p.4   7DEOH/LVWRISDUDPHWHUVIRUHTXLWDWLRQ   #OIP*U ¦ = i i icrit xaT -"    7DEOH/LVWRISDUDPHWHUVIRUHTXLWDWLRQ    3. AUXILIARY LINES FORMING H&&%# %-IG  H)I           #   #%* 3            &&% # G$%2 *H       H)I2       # &&%   )LJXUH$GLDEDWLFDEVRUSWLRQSURFHVVLQSW[GLDJUDP EFM11 01079-p.5  K2           &&% 2                         H)I   #  #%&#7       % &  - K      %        %&! 2S #%& &   #          %&#&&% %S#%                 )LJXUH$GLDEDWLFDEVRUSWLRQDX[LOLDU\OLQHLQSW[GLDJUDP   * %U - T    %      $2#2%  !T%   IT S#    &&%&% V%% #%H)I-""L -"LQ-"L%#% -"LV+ EPJ Web of Conferences 01079-p.6 %* T   )LJXUHSW[GLDJUDPZLWKWKHDGLDEDWLFDEVRUSWLRQDX[LOLDU\OLQHV  4. CONCLUSIONS #%&&% &# %$%#%  #% *&%  #%          #    %  $FNQRZOHGJHPHQWV # $        K 7   '-"-[-"[-WWZ+Q#27K'+T-I-"!"-- EFM11 01079-p.7  5. REFERENCES O-P $ .2 \ .2 -ZZVU K       &2.]2 -YS 2!!Y&!IS O!P #&]2 ]2T ' 72 -ZZYU K      D  #    D%2 .   ]T2!X- 2SV&W- OIP K2^2]\2).\2.K2-ZZ"U 3 & ^* C*   K  _ G     ]28CT2IV2-S"&-SS   EPJ Web of Conferences 01079-p.8