Calculating the model complexity for wireless sensors
I have some real data for my TH12 temperature and humidity sensor which reports it's data every two mins. (using 802.15.4):

https://github.com/malvira/th-12/wiki/wake-current

Along with a spreadsheet:

https://github.com/malvira/th-12/wiki/th12-sleep-current.ods

I'm not entirely sure what you are calculating but make sure to keep your units straight (it's easy to get turned around).

The numbers you have calculated are Power (so J/s) Ptx and Prx (current * voltage). Keeping track of how long things are happening will be very important.

If you look at my data, there is significant overhead time that has to do with the practical details of the system and so you can't just take the payload length and multiply by the bit rate to get how long the TX is on for.

For instance, my CPU is on for 180mS @ 6mA while it comes out of sleep and the control process gets activated by the time slice in the OS. Then the sensor needs about 1000mS @ 1mA to take the reading. 

The TX only takes 7ms @ 24mA but there is 120mS @ 17mA of overhead because of how the radio driver works.

In short, power consumption is quickly dominated by other factors that can't really be estimated without having a benchmark system working.