Air-conditioning apparatus

Patent metadata

Field	Value
Publication number	US-2022205662-A1
Application number	US-201917606780-A
Country	US
Kind code	A1
Filing date	Jul 25, 2019
Priority date	Jul 25, 2019
Publication date	Jun 30, 2022
Grant date	—

Abstract

An air-conditioning apparatus includes a refrigerant circuit in which a compressor, a refrigerant flow switching device, a heat source side heat exchanger, an expansion device, a heat medium heat exchanger, and an accumulator are connected, a heat medium circuit in which a pump, the heat medium heat exchanger, a heat medium flow control device, and a load side heat exchanger are connected, at least one or more bypass pipes provided in the refrigerant circuit so that the refrigerant discharged from the compressor bypasses at least either one of the heat source side heat exchanger and the heat medium heat exchanger, a bypass opening and closing device provided at the bypass pipe, and a controller configured to control the bypass opening and closing device to carry out a start-up control function of causing low-pressure gas refrigerant with a high degree of superheat to flow into the accumulator.

First claim

1 . An air-conditioning apparatus comprising:
a refrigerant circuit in which a compressor, a refrigerant flow switching device, a heat source side heat exchanger, an expansion device, a heat medium heat exchanger, and an accumulator are connected by a refrigerant pipe and through which refrigerant circulates; a heat medium circuit in which a pump, the heat medium heat exchanger, a heat medium flow control device, and a load side heat exchanger are connected by a heat medium pipe and through which a heat medium circulates; at least one or more bypass pipes provided in the refrigerant circuit so that the refrigerant discharged from the compressor bypasses the heat source side heat exchanger and the heat medium heat exchanger; a bypass opening and closing device provided at a midpoint in a pipe conduit of the bypass pipe; and a controller configured to control the bypass opening and closing device to carry out a start-up control function of causing low-pressure gas refrigerant with a high degree of superheat to flow directly into the accumulator from the compressor via the bypass opening and closing device.

2 . An air-conditioning apparatus comprising:
a refrigerant circuit in which a compressor, a refrigerant flow switching device, a heat source side heat exchanger, an expansion device, a load side heat exchanger, and an accumulator are connected by a refrigerant pipe and through which refrigerant circulates; at least one or more bypass pipes provided in the refrigerant circuit so that the refrigerant discharged from the compressor bypasses the heat source side heat exchanger and the load side heat exchanger; a bypass opening and closing device provided at a midpoint in a pipe conduit of the bypass pipe; and a controller configured to control the bypass opening and closing device to carry out a start-up control function of causing low-pressure gas refrigerant with a high degree of superheat to flow directly into the accumulator from the compressor via the bypass opening and closing device.

3 . The air-conditioning apparatus of claim 1 , wherein the controller is configured to activate the compressor after having activated the pump and the heat medium flow control device.

4 . The air-conditioning apparatus of claim 1 , further comprising any one of more of an outdoor temperature detection device configured to detect an outdoor ambient temperature, a first pressure detection device configured to detect a discharge pressure of the compressor, and a second pressure detection device configured to detect a suction pressure of the compressor,
wherein in starting air-conditioning operation, the controller is configured to carry out the start-up control function based on a detected value of at least one or more of the outdoor temperature detection device, the first pressure detection device, and the second pressure detection device in a case in which the detected value is less than or equal to a set value.

5 . The air-conditioning apparatus of claim 1 , further comprising any one of more of an outdoor temperature detection device configured to detect an outdoor ambient temperature, a first pressure detection device configured to detect a discharge pressure of the compressor, and a second pressure detection device configured to detect a suction pressure of the compressor,
wherein while the air-conditioning apparatus is under suspension, the controller is configured to carry out the start-up control function based on a detected value of at least one or more of the outdoor temperature detection device, the first pressure detection device, and the second pressure detection device at set time intervals in a case in which the detected value is less than or equal to a set value.

6 . The air-conditioning apparatus of claim 4 , wherein the controller is configured to terminate the start-up control function in a case in which the detected value of at least one or more of the first pressure detection device and the second pressure detection device is greater than or equal to a threshold or a case in which a period of time elapsed after a start of the start-up control function reaches a set period of time.

7 . The air-conditioning apparatus of claim 1 , wherein the controller is configured to bring the compressor into operation after, at a start of cooling operation, bringing at least one or more of the bypass opening and closing devices into an open state.

8 . The air-conditioning apparatus of claim 1 , wherein the controller is configured to bring the compressor into operation after, at a start of cooling operation, switching the refrigerant flow switching device to an orientation to heating operation and bringing at least one or more of the bypass opening and closing devices into an open state.

9 . The air-conditioning apparatus of claim 1 , wherein the controller is configured to bring the compressor into operation after, at a start of heating operation, bringing at least one or more of the bypass opening and closing devices into an open state.

10 . The air-conditioning apparatus of claim 1 , further comprising a plurality of outdoor units each having at least the compressor, the refrigerant flow switching device, the heat source side heat exchanger, and the accumulator housed in a housing,
wherein each of the plurality of outdoor units are configured to carry out an operation based on the start-up control function.

11 . The air-conditioning apparatus of claim 1 , further comprising a plurality of indoor units each having at least the load side heat exchanger housed in a housing,
wherein the air-conditioning apparatus is configured to operate in an air-conditioning operation mode during which cooling operation by one or more of the plurality of indoor units and heating operation by another one or more of the plurality of indoor units are simultaneously performed.

12 . The air-conditioning apparatus of any one of claim 2 , further comprising any one of more of an outdoor temperature detection device configured to detect an outdoor ambient temperature, a first pressure detection device configured to detect a discharge pressure of the compressor, and a second pressure detection device configured to detect a suction pressure of the compressor,
wherein in starting air-conditioning operation, the controller is configured to carry out the start-up control function based on a detected value of at least one or more of the outdoor temperature detection device, the first pressure detection device, and the second pressure detection device in a case in which the detected value is less than or equal to a set value.

13 . The air-conditioning apparatus of claim 2 , further comprising any one of more of an outdoor temperature detection device configured to detect an outdoor ambient temperature, a first pressure detection device configured to detect a discharge pressure of the compressor, and a second pressure detection device configured to detect a suction pressure of the compressor,
wherein while the air-conditioning apparatus is under suspension, the controller is configured to carry out the start-up control function based on a detected value of at least one or more of the outdoor temperature detection device, the first pressure detection device, and the second pressure detection device at set time intervals in a case in which the detected value is less than or equal to a set value.

14 . The air-conditioning apparatus of claim 12 , wherein the controller is configured to terminate the start-up control function in a case in which the detected value of at least one or more of the first pressure detection device and the second pressure detection device is

Assignees

• Mitsubishi Electric Corp

Inventors

• Ishimura Katsuhiro
• Takenaka Naofumi
• Motomura Yuji
• Okano Hiroyuki
• Tamura Naomichi

Classifications

• F25B2700/2106

  of fresh outdoor air · CPC title

• F25B2600/2501

  Bypass valves · CPC title

• F24F11/48 Primary

  prior to normal operation, e.g. pre-heating or pre-cooling · CPC title

• F25B2400/0409

  for evaporators · CPC title

• F25B2313/0253

  in parallel arrangements · CPC title