||Thermal Analysis of the Manning S-4000 Portable Wastewater Sampler.
Lin, Philip C. L. ;
||Environmental Monitoring and Support Lab.-Cincinnati, OH.
Automatic control equipment ;
Waste water ;
Cooling systems ;
Mathematical models ;
Heat transfer ;
Portable equipment ;
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This study investigated the feasibility of mathematically designing a portable sampler with an ice compartment for the preservation of samples collected in sequence automatically at about 4C for a 24-hour period under certain environmental conditions, specifically 35C for both the ambient temperature and the samples. A Manning S-4000 sampler was selected in this study. A mathematical model to simulate the sample cooling process was developed and experimental measurements on the sampler cooling system were also conducted. The experimental results indicated that about 80 to 96 percent of the cooling capacity of the sampler was lost to the surroundings. A modified cooling system is suggested in this report. The new system has a cooling capacity to lower 24 500-ml samples to about 4C at a cycle time of 1 hour and a temperature of 35C for both the surroundings and the initial samples over a 24-hour period.