Use of Ductless Mini-Spilt Electric Heat Pumps in Residences. Phase 1. Review andAssessment

摘要

This study provides information on the types and intended applications ofcurrently available ductless heat pump systems. Ductless systems use small-diameter refrigerant lines that run from an outdoor compressor to an air handler in each room, drastically reducing the heat loss associated with duct systems. The absence of ductwork reduces both installation costs and operating costs. Over 75 percent of all new homes in Japan have ductless systems. The report describes the technical, cost, and performance characteristics of currently available equipment. It also makes recommendations to manufacturers for improving ductless equipment and lowering initial costs.