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# Winter heating of an office building requires an average of $250 \mathrm{kBtu} / \mathrm{h}$. The heating system uses a heat pump with $\mathrm{COP}=$ 3.0. (a) If the energy supplied to the heat pump costs $\ 0.09 / \mathrm{kWh}$, what's the cost per day to heat the building?

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In this part of the problem we need to find the daily heating cost for a building. The heat pump of $\rm COP = 3$ is used to supply $\dot Q_H = 250~\frac{\rm kBtu}{\rm h}$. Power supplies to the heat pump costs, $c = 0.09~\frac{\}{\rm kWh}$.

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