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Q: A 1-m3 rigid tank contains 100 kg R-22 at ambient temperature, 15?C. A valve on top of the tank is opened, and saturated vapor is throttled to ambient pressure, 100 kPa, and flows to a collector system. During the process the temperature inside the tank remains at 15ºC. The valve is closed when no more liquid remains inside. Calculate the heat transfer to the tank and total entropy generation in the process.