Air conditioner

Patent metadata

Field	Value
Publication number	US-2017191706-A1
Application number	US-201515314022-A
Country	US
Kind code	A1
Filing date	Jun 9, 2015
Priority date	Jul 18, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

A heat-medium flow-path switching device and a heat-medium flow-rate adjusting device are integrated into an integrated heat-medium flow-rate adjusting device. The integrated heat-medium flow-rate adjusting device is configured to perform the heat-medium flow-path switching function and the meat-medium flow-rate adjusting function by driving and controlling a single drive unit. Moreover, the integrated heat-medium flow-path switching device is configured to perform a function of closing flow paths from/to a use-side heat exchanger added to the heat-medium flow-rate adjusting function.

First claim

1 . An air conditioning system comprising:
a refrigerant circulating path network connecting, with refrigerant lines, a compressor; a heat-source side heat exchanger for evaporating and gasifying or condensing and liquefying a heat-source side refrigerant; narrowing devices for controlling a flow rate of the refrigerant; refrigerant pipes in intermediate heat exchangers for exchanging heat between the heat-source side refrigerant and a use-side heat medium; and a refrigerant flow-path switching device for switching a circulation path of the refrigerant, for circulating the heat-source side refrigerant; and a heat medium circulating path network connecting, with heat-medium lines, pumps for pressurizing and sending the heat medium; use-side heat exchangers for exchanging heat between the heat medium with air in interior spaces to be air conditioned; and heat-medium pipes in the intermediate heat exchangers, for circulating the heat medium, wherein
temperatures in the interior spaces to be air conditioned are controlled by exchanging heat, through the use-side heat exchangers, between the air in the interior spaces to be air-conditioned and the heat medium heated or cooled by the heat-source side refrigerant in the intermediate heat exchangers,
the air conditioning system further comprising:
integrated heat-medium flow-path, switching devices connectedly interposed between the intermediate heat exchangers and the use-side heat exchangers, each integrated heat-medium flow-path switching device including thereinside:
a heat-medium flow-path switching valve having holes formed in its sidewall and having a longitudinal inner partition,
wherein the heat-medium flow-path switching valve is revolved to select either of the heated heat medium or the cooled heat medium for it to flow between the intermediate heat exchangers and the use-side heat exchangers, whereby air conditioning is performed.

2 . The air conditioning system of claim 1 , wherein in a case of providing the plurality of use-side heat exchangers, the same or less number of integrated heat-medium flow-path switching devices as or than the number of use-side heat exchangers are provided to perform a heating only operation mode in which all intermediate heat exchangers act as condensers, a cooling only operation mode in which all intermediate heat exchangers act as evaporators, and a cooling and heating mixed operation mode in which part of the intermediate heat exchangers act as a condenser and the other part of the intermediate heat exchangers act as an evaporator.

3 . The air conditioning system of claim 2 , wherein flow rates of the heat medium flowing between the intermediate heat exchangers and the use-side heat exchangers are controlled during each operation mode.

4 . The air conditioning system of claim 3 , wherein switching between the heated heat medium and cooled the heat medium as well as adjusting the flow rates of the heat medium are performed by single drive units provided in the integrated heat-medium flow-path switching devices so as to keep at target values the differences between temperatures measured with temperature sensors provided to the intermediate heat exchangers and temperatures of the heat medium at the use-side heat exchangers.

5 . The air conditioning system of claim 3 , wherein in each operation mode, heat-medium flow paths between the intermediate heat exchangers and the use-side heat exchangers are closed by controlling part of or all of the drive units in the plurality of integrated heat-medium flow-path switching devices to close the flow paths.

6 . The air conditioning system of claim 1 , wherein the refrigerant with which the refrigerant circulating path network is charged is a single refrigerant, a near-azeotropic refrigerant mixture, a non-azeotropic refrigerant mixture, or a natural refrigerant that is changeable to a two-phase state or a supercritical state.

7 . The air conditioning system of claim 1 , wherein the heat medium with which the heat-medium circulating path network is filled is an antifreeze liquid or a mixture of water and an additive having a high anti-corrosion effect.

8 . The air conditioning system of claim 1 , wherein the flow paths of the heat medium are formed by configuring integrated heat-medium flow-path switching devices such that part of flow paths of the heated heat medium and/or the cooled heat medium are connectedly formed in the integrated heat-medium flow-path switching devices.

9 . The air conditioning system of claim 1 , wherein the flow paths of the heat medium are formed by joining pipes that are connected to the integrated heat-medium flow-path switching device(s) and through which the heated heat medium and/or the cooled heat medium are/is passed, to allow the number of integrated heat-medium flow-path switching devices to be changeable.

Assignees

• Mitsubishi Electric Corp

Inventors

• Ogawa Mizuki
• Takamatsu Ryohei
• Saito Koji
• Imaizumi Masaru
• Motomura Yuji

Classifications

• F25B2313/0272

  using bridge circuits of one-way valves · CPC title

• F25B29/00

  Combined heating and refrigeration systems, e.g. operating alternately or simultaneously · CPC title

• F24F5/00

  Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00 {, e.g. using solar heat or combined with household units such as an oven or water heater} · CPC title

• F25B2313/006

  two pipes connecting the outdoor side to the indoor side with multiple indoor units · CPC title

• F25B2313/0231

  with simultaneous cooling and heating · CPC title