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Title:
HEAT PUMP SYSTEM AND CONTROL METHOD FOR THE SAME
Document Type and Number:
Japanese Patent JP2017201218
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To follow a change of compressor characteristics and fluctuation of a temperature condition and thus improve efficiency of a heat pump.SOLUTION: A heat pump system includes: a low stage side compressor; a high stage side compressor; a first condenser for condensing a refrigerant compressed by the high stage side compressor; a second condenser for condensing a refrigerant compressed by the low stage side compressor; a hot water heat transfer pipe in which hot water exchanging heat with the refrigerant in the first condenser and the second condenser circulates; an expansion valve for expanding a liquid refrigerant guided from the first condenser and the second condenser; an evaporator for evaporating the refrigerant expanded by the expansion valve; a storage section 12 for storing compressor characteristics of each of the high stage side compressor and the low stage side compressor; and a control section 14 for determining an operation point at which efficiency of the high stage side compressor and the low stage side compressor is maximized, on the basis of an operating state of the heat pump system and each of the compressor characteristics so that a set outlet temperature of the hot water set to an outlet side of the hot water heat transfer pipe becomes a target value, and controlling rotational frequencies of the high stage side compressor and the low stage side compressor so as to reach the operation point.SELECTED DRAWING: Figure 2

Inventors:
WAJIMA KAZUYOSHI
HASEGAWA HIROSHI
TANIMURA YUTA
SUEMITSU RYOSUKE
Application Number:
JP2016092473A
Publication Date:
November 09, 2017
Filing Date:
May 02, 2016
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND THERMAL SYSTEMS LTD
International Classes:
F25B1/00; F25B1/10; F25B6/02; F25B30/02
Attorney, Agent or Firm:
Noriharu Fujita
Miori Takao
Kawakami Miki
Daisuke Nagata