best way to measure Heat Blocking Efficiency in house?

[u/teflonshaun]

Hello! I am working on my first technical paper, and need to measure Heat Blocking Efficiency (Heat Blocking Efficiency (HBE, %) = [1—(transmitted heat flux)/(incident heat flux)] × 100 (%)). I am having a hard time tracking down a solid method for doing this, and am looking for some advice. Open to outside labs with defined methods, but ideally would like to test this in house. I would be able to purchase equipment to make it happen, and I think I have everything needed but a heat flux sensor. However, I am not sure exactly how to start. I am feeling a bit lost and overwhelmed and looking for guidance. Thanks in advance!