You’re engineering an energy-efficient house that will require an average of 6.85 kW to heat on cold winter days. You’ve designed a photovoltaic system for electric power, which will supply on average 2.32 kW. You propose to heat the house with an electri-cally operated groundwater-based heat pump. What should you specify as the minimum acceptable COP for the pump if the pho-tovoltaic system supplies its energy?

2.95 approximately 3

Explanation:

For a heat pump,

COP = Q/W

Where Q = power needed for heating process

W = power input into heat pump.

Power for heating Q = 6.85 kW

Proposed power input to heat pump W = 2.32 kW

Minimum COP = 6.85/2.32 = 2.95

Approximately 3

answer:

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