Patent ID: 8745999
Filing Date: 2014-06-10
Classification: F25B,F25D

Abstract:
1. A heat pump apparatus including a refrigerant circuit, in which a compressor, a condenser, expansion means, and an evaporator are serially connected, comprising: a condensation temperature detection means that detects a saturation temperature of said condenser; an evaporation temperature detection means that detects a saturation temperature of said evaporator; and a control section that estimates operation efficiency by a value obtained by dividing heating ability estimated from a detection value of said condensation temperature detection means by a difference between the detection value of said condensation temperature detection means and the detection value of said evaporation temperature detection means or dissipation power estimated from said difference, wherein the control section starts a defrosting operation when an estimated operation efficiency decreases to a value of average operation efficiency from a start of normal operation to an end of the defrosting operation when the defrosting operation is performed at the present time, where the value of average operation efficiency is estimated based on an average value of the operation efficiency from a start of normal operation to the present time.