Month: February 2010

Equivalent conductance due to air infiltrations

Here is how you compute the thermal coupling between a room’s indoor temperature and the outdoor temperature due to infiltrations. The equation governing the exchange of heat is as follows: Cair × dT/dt = g × Δ T where Cair is the indoor air thermal mass [J/K], T is the indoor air temperature [K], g […]

Event rate of arrival analysis with R

Here is a very common problem: suppose you’re give a series of event timestamps. The events can be anything—website logins, persons entering a building, anything that recurs regularly in time but whose rate of arrival is not known in advance. Here is, for example, such a file which I had to analyze: 05.02.2010 09:00:18 05.02.2010 […]

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