Abstract
The aqueous solution of ammonia is expected to be used as not only a working fluid for absorption refrigerator but also working fluids for a bottoming cycle of steam power plant, and other heat recovering systems. Therefore, the thermodynamic properties of this substance are required in the wide range of temperatures and pressures. The present pVTx property measurements were conducted in order to make clear the maximum density phenomena of the aqueous dilute solution of ammonia in the low temperature liquid region, and they showed the minimum pressure near the temperature 269 K along each isochore as shown in Fig.2. It is clear from thermodynamic theory that the minimum pressure state along isochoric line corresponds to the maximum density state along the isobaric line. This present study represents experimentally that the maximum density phenomena of water have influence on the similar property behavior for the aqueous dilute solution of ammonia.
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