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D E = 0 = Qgen - Qabs - Qcond + Qevap in .NET Encode Code 3/9 in .NET D E = 0 = Qgen - Qabs - Qcond + Qevap

D E = 0 = Qgen - Qabs - Qcond + Qevap generate, create barcode 39 none with .net projects iOS S = 0 = Q gen Tgen Qabs Qcond Qevap + Tabs Tcond Tevap (2.13) (2.14).

with all ene barcode 39 for .NET rgy flows defined as positive. In the reversible limit, T cond = T abs, i.

e., all heat rejection proceeds at the same temperature, and the 4-reservoir system effectively reduces to a 3-reservoir system. With the above definition of absorption chiller COP, we combine Equations (2.

10), (2.13) and (2.14) to obtain.

Carnot COPabsorption chiller 1 1 Tabs Tgen . = 1 1 Tevap Tabs (2.15). For the abso Code 39 for .NET rption heat pump, with the useful effect being the total heat rejection, it follows that . Carnot Carnot COPabsorption heat pump = COPabsorption chiller + 1. (2.16). For the abso rption heat transformer, the useful effect is the heat rejection at the absorber only, and the input is the total heat absorption at the generator and evaporator. The reversible limit again reduces a 4-reservoir system to a 3-reservoir system, but with a distinct condenser and absorber whereas the generator and evaporator now operate at the same temperature. It then follows that.

Thermodynamic and Operational Fundamentals Carnot COPabsorption heat transformer Tcond Tevap = 1 1 Tcond Tabs (2.17). ____________ Code 39 Full ASCII for .NET _____________________________________________________________. Tutorial 2.3 Table 2.4 sh Code 39 for .NET ows the technical specifications for a steam-fired single-stage LiBr in in water absorption chiller.

The rated conditions are T evap = 12.7 C, Tcond = 30.0 C in and T gen = 115.

0 C. The chiller generates a cooling power of 3068 kW. When we refer to a dilute or concentrated solution here, we mean dilute or concentrated with respect to LiBr.

This is the convention adopted by chiller engineers in dealing with LiBr water absorption machines. (Unfortunately, in relating to ammonia water absorption machines, chiller engineers use dilute to indicate dilute with respect to the refrigerant.) Table 2.

5, taken from standard thermodynamic tables [ASHRAE 1998], provides the thermodynamic properties of the LiBr water solution at the state points along the absorption cycle. Figure 2.23 sketches the principal chiller components, heat flows and flow rates.

Based on these specifications and invoking simple mass balance at the generator,. Table 2.4: Technical specifications of the steam-fired single-stage LiBr water absorption chiller. variable e v .NET Code 39 Full ASCII a p o ra to r te mp e ra ture a b s o rb e r e q uilib rium te mp e ra ture s o lutio n te mp e ra ture in the a b s o rb e r (a nd a t the inle t to the he a t e xc ha nge r) d ilute s o lutio n te mp e ra ture a fte r the s o lutio n he a t e xc ha nge r (b e fo re e nte ring the ge ne ra to r) c o nc e ntra te d s o lutio n te mp e ra ture b e fo re the s o lutio n he a t e xc ha nge r (a fte r e xiting the ge ne ra to r) c o nc e ntra te d s o lutio n te mp e ra ture a fte r the s o lutio n he a t e xc ha nge r (b e fo re thro ttling into the a b s o rb e r) re frige ra nt (wa te r) va p o r te mp e ra ture le a ving the ge ne ra to r re frige ra nt (wa te r) liq uid te mp e ra ture le a ving the c o nd e ns e r ma s s fra c tio n o f LiBr in the s o lutio n le a ving the ge ne ra to r ma s s fra c tio n o f LiBr in the s o lutio n re turning to the ge ne ra to r (fro m the a b s o rb e r) value 5 C 45 C 45 C 82 C 104 C 60.6 C 98 C 45 C 0.

652 0.603. Cool Thermodynamics Mechanochemistry of Materials Table 2.5: T Visual Studio .NET barcode 3 of 9 hermodynamic properties of the refrigerant (water) at key points along the absorption refrigeration cycle.

(Pressure values are included to afford an appreciation of the partial vacuum under which the chiller operates.). pressure (kP a) 9.81 0.89 0.

87 0.87 9.81 9.

81 9.59 0.87 0.

87 temp. ( C) 104 60.6 45 45 82 98 45 5 5 specific enthalpy (kJ kg 1) 2 6 1.

3 9 185.2 126.10 126.

10 196.64 2683.05 188.

41 2509.71 18 8 . 4 1 specific entropy (kJ kg 1 K 1) 0.

5262 0.31182 0.2438 0.

2438 0.4536 8 . 4 6 17 0.

6385 9.0235 0.67807 LiBr mass fraction, X 0.

652 0.652 0.603 0.

603 0.0 0.0 0.

0 0.0. state point .NET barcode 39 1. inside the generator 2.

solution heat exchanger outlet (concentrated solution) 3. inside the absorber 4. absorber outlet 5.

solution heat exchanger outlet (dilute solution) 6. generator outlet 7. condenser outlet 8.

evaporator outlet vapor liquid. determine: ( 1) the ratio of solution mass flow rate at the absorber to refrigerant mass flow rate, commonly called the circulation flow rate ratio CR; (2) the chiller s COP; and (3) the mass flow rate of saturated steam that must be supplied to the generator. Solution: We begin by considering the mass balance for the refrigerant flows into and out of the generator (at steady state): (mass flow rate of refrigerant entering from the concentrated solution) (mass flow rate of refrigerant leaving via the dilute solution) = (mass flow rate of refrigerant leaving as vapor from the generator) . (2.

18) To work with convenient dimensionless variables, we: (a) divide each of the mass flow rates by the refrigerant mass flow rate; and (b) express the relative amount of LiBr in the solution by its mass fraction X. Equation (2.18) can then be expressed as (1 X conc) CR (1 X dilute) (CR 1) = 1 (2.

19). where the su Code 3/9 for .NET bscripts conc and dilute refer to the concentrated and dilute solutions, respectively. With the given values of X conc = 0.

603 and X dilute = 0.652, we solve Equation (2.19) for CR, to obtain CR = 13.

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