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diff --git a/paper/ihsm_paper.tex b/paper/ihsm_paper.tex index 851da46..f4cea28 100644 --- a/paper/ihsm_paper.tex +++ b/paper/ihsm_paper.tex @@ -420,9 +420,13 @@ motor requires more power than the mesh monitoring circuit of a traditional HSM. Uninterruptible Power Supply (UPS) can be used, but in practice a productized IHSM might have a smaller backup battery integrated into its case. Conservatively assuming an average operating power consumption of $\SI{10}{\watt}$ for an IHSM's motor, a single large laptop battery with a capacity of $\SI{100}{\watt\hour}$~\cite{faa2018} could already power -an IHSM for 10 hours continuously. If a built-in battery is undesirable, or if power outages of more than a few seconds -at a time are unlikely (e.g.\ because the IHSM is connected to an external UPS or generator), the IHSM's rotor itself -can be used as a flywheel for energy storage. +an IHSM for 10 hours continuously. $\SI{10}{\watt}$ is a reasonable high estimate given that there are large industrial +fans rated at lower wattages. For example, \texttt{CF2207LBL-000U-HB9}, a $\SI{250}{\milli\meter}$ diameter +$\SI{7.8}{\meter^3\per\minute}$ industrial axial fan made by Sunon is rated at only +$\SI{6.6}{\watt}$\footnote{\url{https://www.digikey.com/en/products/detail/sunon-fans/CF2207LBL-000U-HB9/9083282}}. If +a built-in battery is undesirable, or if power outages of more than a few seconds at a time are unlikely (e.g.\ because +the IHSM is connected to an external UPS or generator), the IHSM's rotor itself can be used as a flywheel for energy +storage. \paragraph{Spurious alarms.} Even with all components working to their specification, an IHSM could still catastrophically fail if for some reason |