Stalin

Hi, Does Ventsim Control read data from AlphaNuclear radon monitors? http://www.alphanuclear.com/products-man.html Thanks, Stalin

Why is the thermal discomfort index not included in the heat tool? References: 1. THOM, E.C. The discomfort index. Weatherwise,Washington, v. 12, p. 57- 59, 1959. 2. ONO, H. S. P.; KAWAMURA, T. Sensible climates in monsoon Asia. International Journal of Biometeorology, Ibaraki, v. 35, p. 39-47, jan. 1991. 3. ALDUCHOV, O. A.; ESKRIDGE, R. E. Improved Magnus form approximation of saturation vapor pressure. Journal of Applied Meteorology, v. 35, p.601-609, 1996.

Radon simulation.

How does VentSim determine whether the fan will work by blowing in air or exhausting air? I input the data from a fan (blowing) and VentSim simulates first as if the fan is exhausting air. Why does it happen? That way, I have to put the fan running in reverse mode.

What is happening? For approximately the same length of ducts, Pressure FTP is so different.

I was hoping that the radon concentration would increase at the end of the simulation. Am I wrong?

When I click on Radon Simulation (Dynamic simulation and options), the values (dosage / year, concentration, progeny, etc.) are reset. What is happening?

Yes. Thank you very much. What will be the formula for calculating the necessary ventilation? Will the calculations look like the attachment?

Is there any chance that Ventsim will have a tool that calculates the flow needed to decrease(dilution) the concentration of radon and radionuclides within limits established, for example, by the IAEA?

What are the radon and radionuclides levels (Regulatory Standards/Norms) in Australian underground uranium mines? Could someone send me a PDF on this subject (Regulatory Standards/Norms)?

Thank you very much!

Thanks for the answer. To calculate the power of the fans, I fixed the flow at the air exits (exhaust fans) of the mine. Then I simulate the pressure loss (Pressure Collar TP) on these exits. With these values (flow and pressure loss = Pressure Collar TP), I select the fans. I would like to know how to obtain the calculation report for the pressure loss (Pressure Collar TP) calculated. Does the Ventsim program generate this type of report?

Thanks for your response. How do I get the calculation memory for the power of the main exhaust fans? I need to present this in an audit.

I would like to know if the data generated by the Ventsim program are validated. What design standards does the program adopt?

What is the air loss (m3/s) considered in the vent duct connections by the Ventsim program? Can it be editable?

In radon simulation, the dosage / year is a function of radon gas, radon progeny, radioactive and gamma ray. Right or wrong? The Effective Dose is ED u/g miner = RP + RG + RD + G RP = Radon Progeny (WLM) RG = Radon Gas (Bq/Yr) RD = Radioactive Dust (Bq/Yr) G = Gamma (mSv)

I found. I already knew this site, but I didn't know about this Javashield tool. “Ctrl U” for you see the calculations. Link: http://www.eic.nu/Tools/JavaShield/Target_Dose_Cyl.html

Thanks for message.

A tool that calculates the DAC (Derived Air Concentration) Explaining ... Long Lived Radioactive Dust (LLRD) is something totally different than radon progeny. You inhale radon progeny and, after a few hours, it will all have decayed and nothing is left in your lungs. LLRD is fine uranium ore. It has a half life of a few billion years. So, it stays radioactive in your lung longer than radon progeny. As a result, the dose per unit intake is higher and the allowed intake is lower. A “DAC” is concentration that, if you breathed it all year, would give you 20 mSv dose. LLRD concentration are difficult to predict. LLRD is controlled by keeping the ore wet when loading etc and standing up-wind of drilling etc.

You can start your work with the link (https://www.nrc.gov/docs/ML1122/ML11229A721.pdf). Pages 29 to 76. If I find a more specific document, I'll post it here. Read the articles below. M Sonter. Gamma dose rates as a function of ore grades in underground uranium mines. Australian Radiation Protection Society Bulletin, Vol 5 No 3, 1987 Calculation of Gamma Ray Exposure Rates from Uranium Ore Bodies. Australian Radiation Laboratory Report TR14. February 1980.

Thanks for message. Ventsim Design Premium + Multiflux Version 5.2.6.7 64 bit

Another way of calculating radon production due to water percolation: V m3/day waterflow for ore with grade A ppm and density equal B t/m3 : Ew =A gU/t x B t/m3 x C Bq/gU = D Bq/m3 (Ore) D Bq/m3 (Ore) x 1 m3 (Ore) / 0.1 m3 (Water)( Supposed amount of water in 1 m3 of ore)= E Bq/m3 (Water) Ew = E Bq/m3 (Water) x V m3 (water/day) x 0.85 (e.g.,emanation from water)=F Ew = F/day/24/3600 Ew = Fx60 Bq/min => Ew = G Bq/min Observation: See my answer in suggestion 1 (Radon simulation Suggestion 1).

The grade times the mass gives you the total amount of U. Ra will be in secular equilibrium with U. The specific activity of U is 12350 Bq/g. Each Bq of Ra makes 1 atom of Rn per second. That gives you the amount of Rn (in atoms) generated inside the ore. Multiply by the emanation fraction to get the amount released (in atoms). Multiplying that by 0.0000021 converts atoms of Rn to Bq. For the water, its very similar. The emanation fraction, in that case, will give you the fraction of the radon that stays in the ore vs what gets into the pore space.

I believe it would be interesting to discern the contributions of radionuclides to WL. Since WL is the sum WL = (WL) RaA + (WL) RaB + (WL) RaC. Those are the radon progeny. The definition of the Working Level (WL) is the potential alpha energy contained in the radon progeny. So, you need to know the progeny concentrations to be able to calculate WL. In radiological / radioprotection terms it is also interesting to know the distribution of radionuclides (solid elements) inside the underground mine. For understanding, I suggest you read the paper (Engineers' guide to the elementary behavior of radon daughters by Robley D. Evans). I can send the article to your email, if you want it.

When I preset combustibles I cannot change the values. What is happening?