Residential heat pump experiments in Philadelphia ¿ Suggested possibilities for practical applications

As a result of operating experience on experimental heat pumps in Philadelphia, this paper suggests the necessity for improving the annual load factor of heat pump systems through the employment of heat storage. It demonstrates the relationship between minimum capacity of heat storage with reduced capacity of heating plants, and concludes that it should be economically practical to supply electricity to heat storage types of heat pump systems in competition with other fuels.