Vapor Pressure and Viscosity of Solutions in the Calcium Oxide-Phosphoric Oxide-Water System at 25° C.

1958 ◽  
Vol 3 (1) ◽  
pp. 17-20 ◽  
Author(s):  
E. Huffman ◽  
J. Fleming ◽  
A. Smith
Keyword(s):  
Vapor Pressure ◽  
Calcium Oxide ◽  
Water System

STUDIES IN THE SYSTEM CALCIUM-OXIDE–SULPHUR-DIOXIDE–WATER: IV. VAPOR PRESSURE STUDIES IN THE PRESENCE OF CELLULOSE AND WOOD

1936 ◽  
Vol 14b (8) ◽  
pp. 301-309
Author(s):  
P. E. Gishler ◽  
O. Maass
Keyword(s):  
Carbon Dioxide ◽  
Vapor Pressure ◽  
Calcium Oxide ◽  
Sulphur Dioxide ◽  
Relative Rate ◽  
New Technique ◽  
Wood Cellulose ◽  
A New Technique ◽  
Pressure Changes ◽  
Rate Of Consumption

A new technique has been developed for the purpose of studying, by means of vapor pressure changes, the effect of wood and cellulose on the system calcium-oxide–sulphur-dioxide–water. Preliminary experiments are described. A sample calculation has been made, to indicate that vapor pressure changes might be used to determine the relative rate of consumption of sulphur dioxide and calcium oxide during the cooking of wood. Cellulose does not yield carbon dioxide in appreciable quantities during cooking.

STUDIES IN THE SYSTEM CALCIUM-OXIDE–SULPHUR-DIOXIDE–WATER: II. CALCULATION OF IONIC CONCENTRATIONS

1935 ◽  
Vol 13b (5) ◽  
pp. 308-322
Author(s):  
P. E. Gishler ◽  
O. Maass
Keyword(s):  
Vapor Pressure ◽  
Calcium Oxide ◽  
Sulphur Dioxide ◽  
Conductivity Data ◽  
Pressure Data ◽  
Vapor Pressure Data ◽  
Ionic Concentrations ◽  
Methods Of Calculation ◽  
Temperature And Pressure ◽  
Good Agreement

The conductivity and vapor pressure data of the system calcium-oxide–sulphur-dioxide–water presented in an earlier paper have been used to calculate ionic concentrations existing in this system, in the temperature and pressure range investigated. Two methods of calculation have been employed, one depending on the combination of vapor pressure and conductivity data, and the other, on conductivity data. For both, recourse was had to the data of Campbell and Maass on the system sulphur-dioxide–water. These methods gave results that are in good agreement with each other. The existence of a complex CaSO3.Ca(HSO3)2 was deduced.Hydrogen ion concentrations over the concentration and temperature range investigated have been calculated and extrapolations made to higher temperatures. These are presented in tabular form. Apart from the theoretical interest, it is pointed out that these results are of value in connection with studies of the delignification of wood by calcium-oxide–sulphur-dioxide–water solutions.

Experimental Study of a Self-Pumping Boiling Collector Solar Hot Water System

1989 ◽  
Vol 111 (3) ◽  
pp. 211-218 ◽  
Author(s):  
J. H. Davidson ◽  
H. A. Walker ◽  
G. O. G. Lo¨f
Keyword(s):  
Experimental Study ◽  
Vapor Pressure ◽  
Water System ◽  
Heating System ◽  
Hot Water ◽  
The Self ◽  
Operating Characteristics ◽  
Pumping System ◽  
Fort Collins ◽  
Mechanical Pump

Results of an experimental study of a full-scale passive solar hot water heating system utilizing a boiling collector are presented. The self-pumping system alternates between two modes of operation. During the run cycle, vapor pressure drives the evaporated refrigerant downward from the collector to the condenser. Once a preset quantity of refrigerant is condensed, vapor pressure is again used to force the return of the condensate to the collector during the pump cycle. In order to assess the thermal penalty of self-pumping operation, the system is also operated with a mechanical pump. Daily operating characteristics and seasonal performance are discussed. Performance of the self-pumping system is strongly influenced by the duration of the pump cycle. The average thermal loss attributed to self-pumping during one heating season in Fort Collins, Colo. is approximately nine percent of the solar energy incident on the collector. Refinement of the system design, including individual components, is required to reduce losses and improve performance.

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