Air conditioner, air conditioning system, and air-conditioning controller

Patent metadata

Field	Value
Publication number	US-10899197-B2
Application number	US-201916700805-A
Country	US
Kind code	B2
Filing date	Dec 2, 2019
Priority date	Jun 28, 2017
Publication date	Jan 26, 2021
Grant date	Jan 26, 2021

Abstract

An air conditioner includes an inside condenser, an outside heat exchanger, an inside evaporator, a refrigerant circuit switcher, and an air passage switcher. The refrigerant circuit switcher is configured to switch a layout of the refrigerant circuit to (i) a first circuit during a heating mode such that the refrigerant releases heat at the inside condenser and is decompressed to evaporate at the outside heat exchanger and (ii) a second circuit during a defrosting mode such that the refrigerant releases heat at the outside heat exchanger and is decompressed to evaporate at the inside evaporator. The air passage switcher is configured to switch the air passage to (i) a first passage during the heating mode such that the air passes through the inside evaporator and the inside condenser and (ii) a second passage during the defrosting mode such that the air bypasses the inside condenser.

First claim

What is claimed is:

1. An air conditioner comprising:
a compressor configured to compress and discharge a refrigerant;
an inside condenser configured to exchange heat between the refrigerant that was discharged from the compressor and an air that is to be conveyed to an air-conditioning target space;
an outside heat exchanger configured to exchange heat between the refrigerant that flows out of the inside condenser and an outside air;
an inside evaporator configured to exchange heat between the refrigerant that flows out of the outside heat exchanger and the air such that the refrigerant evaporates;
a refrigerant circuit switcher configured to switch a refrigerant circuit between a heating circuit and a defrosting circuit;
an auxiliary heater configured to heat the air;
an air passage forming portion defines an air passage through which the air flows, the air passage including a first passage and a second passage;
an air passage switcher configured to switch the air passage; and
a heating performance controller configured to control a heating performance of the auxiliary heater, wherein
the inside condenser, the inside evaporator, and the auxiliary heater are disposed in the air passage,
the inside condenser is disposed in the first passage,
the auxiliary heater is located downstream of the first passage and the second passage to heat the air that flows out of the first passage and the air that flows out of the second passage,
the refrigerant circuit switcher is configured to switch the refrigerant circuit to:
the heating circuit during a heating mode for heating the air-conditioning target space such that the refrigerant releases heat at the inside condenser and is decompressed to evaporate at the outside heat exchanger; and
the defrosting circuit during a defrosting mode for defrosting the outside heat exchanger such that the refrigerant releases heat at the outside heat exchanger and is decompressed to evaporate at the inside evaporator,

the air passage switcher is configured to switch the air passage to:
the first passage during the heating mode such that the air passes through the inside evaporator, the inside condenser, and the auxiliary heater in this order; and
the second passage during the defrosting mode such that the air bypasses the inside condenser and passes through the inside evaporator and the auxiliary heater in this order, and

the heating performance controller is configured to control the heating performance of the auxiliary heater in the defrosting mode to be higher than the heating performance of the auxiliary heater in the heating mode.

2. The air conditioner according to claim 1 , wherein
the air passage switcher is configured to switch the air passage to the first passage during the heating mode such that the air passes through the inside evaporator, the inside condenser, and the auxiliary heater in this order.

3. The air conditioner according to claim 2 , wherein
the air passage forming portion defines:
an inside condenser passage through which the air exchanging heat with the refrigerant at the inside condenser flows; and
a cold air bypass passage through which the air bypassing the inside condenser flows,

the air passage switcher includes a guiding portion configured to selectively guide the air flowing out of the inside condenser passage or the air flowing out of the cold air bypass passage toward the auxiliary heater.

4. The air conditioner according to claim 1 ,
wherein
the refrigerant circuit switcher is configured to switch the refrigerant circuit to the defrosting circuit during a cooling mode for cooling the air-conditioning target space such that the refrigerant releases heat at the outside heat exchanger and is decompressed to evaporate at the inside evaporator,
the air passage switcher is configured to switch the air passage to the second passage during the cooling mode, and
the heating performance controller is configured to stop a heating by the auxiliary heater during the cooling mode.

5. The air conditioner according to claim 1 , further comprising:
an inside-outside air switcher configured to switch between an outside air mode for introducing the outside air into the air passage and an inside air mode for introducing an inside air in the air-conditioning target space into the air passage, wherein
the inside-outside air switcher is configured to switch to the inside air mode during the defrosting mode.

6. The air conditioner according to claim 1 , wherein
the refrigerant circuit switcher is configured to switch the refrigerant circuit to the defrosting circuit during a cooling mode for cooling the air-conditioning target space such that the refrigerant releases heat at the outside heat exchanger and is decompressed to evaporate at the inside evaporator,
the air passage further includes a third passage, and
the air passage switcher is configured to switch the air passage to the third passage during the cooling mode such that the air flows through the inside evaporator and bypasses the inside condenser and the auxiliary heater.

7. An air conditioning system comprising:
a compressor configured to compress and discharge a refrigerant;
an inside condenser configured to exchange heat between the refrigerant that was discharged from the compressor and an air that is to be conveyed to an air-conditioning target space;
an outside heat exchanger configured to exchange heat between the refrigerant that flows out of the inside condenser and an outside air;
an inside evaporator configured to exchange heat between the refrigerant that flows out of the outside heat exchanger and the air such that the refrigerant evaporates;
a refrigerant circuit switcher configured to switch a refrigerant circuit between a heating circuit and a defrosting circuit;
an auxiliary heater configured to heat the air, the auxiliary heater, the inside condenser, and the inside evaporator being disposed in an air passage;
an air passage forming portion defines the air passage through which the air flows, the air passage including a first passage and a second passage;
an air passage switcher configured to switch the air passage between the first passage and the second passage;
one or more processors;
a memory coupled to the one or more processors and storing program instructions that when executed by the one or more processors cause the one or more processors to at least:
control the refrigerant circuit switcher to switch the refrigerant circuit to:
the heating circuit during a heating mode for heating the air-conditioning target space such that the refrigerant releases heat at the inside condenser and is decompressed to evaporate at the outside heat exchanger; and
the defrosting circuit during a defrosting mode for defrosting the outside heat exchanger such that the refrigerant releases heat at the outside heat exchanger and is decompressed to evaporate at the inside evaporator; and

control the air passage switcher to switch the air passage to:
the first passage during the heating mode such that the air passes through the inside evaporator, the inside condenser, and the auxiliary heater in this order; and
the second passage during the defrosting mode such that the air bypasses the inside condenser and passes through the inside evaporator and the auxiliary heater in this order; and

a heating performance controller configured to control a heating performance of the auxiliary heater, wherein
the heating performance controller is configured to control the heating performance of the auxiliary heater in the defrosting mode to be higher than the heating performance of the auxiliary heater in the heating mode.

8. An air-conditioning controller for controlling an air conditioner that incl

Assignees

• Denso Corp

Inventors

• Yamada Etsuhisa
• Ito Satoshi
• Hasegawa Hiroya

Classifications

• B60H1/3213 Primary

  for increasing the efficiency in a vehicle heat pump · CPC title

• B60H1/00921 Primary

  where the flow direction of the refrigerant does not change and there is an extra subcondenser, e.g. in an air duct · CPC title

• F25B41/24

  Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part · CPC title

• F25B2400/0411

  for expansion valves or capillary tubes · CPC title

• B60H1/32

  Cooling devices {(B60H1/00478, B60H1/005 take precedence)} · CPC title