Air-conditioning apparatus and air handling unit

Patent metadata

Field	Value
Publication number	US-12173918-B2
Application number	US-201816965736-A
Country	US
Kind code	B2
Filing date	Feb 22, 2018
Priority date	Feb 22, 2018
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

An air-conditioning apparatus includes a heat source side unit configured to heat or cool a heat medium used as a heat-conveying medium, an air handling side heat exchanger that exchanges heat between outside air that is sent into a building and the heat medium, and an indoor side heat exchanger that exchanges heat between indoor air and the heat medium. The heat source side unit, the air handling side heat exchanger, and the indoor side heat exchanger are connected by piping to each other to form a heat medium cycle circuit through which the heat medium circulates. In the heat medium cycle circuit, a portion of the heat medium heated or cooled by the heat source side unit flows into the indoor side heat exchanger after having passed through the air handling side heat exchanger.

First claim

The invention claimed is:

1. An air-conditioning apparatus, comprising:
a heat source side unit configured to heat or cool a heat medium used as a heat-conveying medium;
an air handling side heat exchanger that exchanges heat between outside air that is sent into a building and the heat medium; and
an indoor side heat exchanger that exchanges heat between indoor air and the heat medium, wherein
the heat source side unit, the air handling side heat exchanger, and the indoor side heat exchanger are connected by piping to each other to form a heat medium cycle circuit through which the heat medium circulates,
in the heat medium cycle circuit, a portion of the heat medium heated or cooled by the heat source side unit flows into the indoor side heat exchanger after having passed through the air handling side heat exchanger,
the heat medium cycle circuit is provided with an air handling side flow rate control valve configured to adjust a flow rate of the heat medium that passes through the air handling side heat exchanger, and
the air-conditioning apparatus further comprises an air handling side amount-of-heat detection device configured to detect an amount of heat that is exchanged in the air handling side heat exchanger,
wherein the air handling side amount-of-heat detection device includes
an air handling inlet side temperature sensor configured to detect a temperature of the heat medium that flows into the air handling side heat exchanger,
an air handling outlet side temperature sensor configured to detect a temperature of the heat medium that flows out from the air handling side heat exchanger,
an air handling inlet side pressure sensor configured to detect a pressure of the heat medium that flows into the air handling side heat exchanger,
an air handling outlet side pressure sensor configured to detect a pressure of the heat medium that flows out from the air handling side heat exchanger, and
an air handling unit controller configured to calculate, on a basis of the temperature detected by the air handling inlet side temperature sensor, the temperature detected by the air handling outlet side temperature sensor, the pressure detected by the air handling inlet side pressure sensor, the pressure detected by the air handling outlet side pressure sensor, and an opening degree of the air handling side flow rate control valve, an amount of heat that is exchanged in the air handling side heat exchanger,

wherein, in a case where an amount of heat required by the air handling side heat exchanger is larger than the amount of heat that is exchanged in the air handling side heat exchanger and an upper limit of a flow rate that is adjustable by the air handling side flow rate control valve is reached, a heat source side unit controller configured to control an amount of heating or an amount of cooling that the heat source side unit supplies to the heat medium controls the heat source side unit to increase an amount of heating or an amount of cooling that is imparted to the heat medium.

2. The air-conditioning apparatus of claim 1 , wherein
another portion of the heat medium heated or cooled by the heat source side unit flows into the indoor side heat exchanger without passing through the air handling side heat exchanger, and
the air handling side flow rate control valve is configured to adjust a ratio between a flow rate of the heat medium that flows into the indoor side heat exchanger through the air handling side heat exchanger and a flow rate of the heat medium that flows into the indoor side heat exchanger without passing through the air handling side heat exchanger.

3. The air-conditioning apparatus of claim 2 , wherein a portion of the heat medium heated or cooled by the heat source side unit that has passed through the air handling side heat exchanger and another portion of the heat medium heated or cooled by the heat source side unit that does not pass through the air handling side heat exchanger flow into the indoor side heat exchanger after having converged at a pipe that connects the air handling side heat exchanger with the indoor side heat exchanger.

4. The air-conditioning apparatus of claim 1 , wherein
the heat medium cycle circuit includes a bypass pipe by which a pipe that connects the heat source side unit with the air handling side heat exchanger and a pipe that connects the air handling side heat exchanger with the indoor side heat exchanger are connected to each other, without connecting through the air handling side heat exchanger, and
the air handling side flow rate control valve is configured to adjust a ratio between a flow rate of the heat medium that flows into the indoor side heat exchanger through the air handling side heat exchanger and a flow rate of the heat medium that flows into the indoor side heat exchanger through the bypass pipe.

5. The air-conditioning apparatus of claim 1 , wherein
the heat source side unit includes
a compressor configured to compress heat source side refrigerant,
a heat source side heat exchanger that exchanges heat between the heat source side refrigerant and air,
an expansion valve configured to decompress the heat source side refrigerant, and
a heat medium heat exchanger that exchanges heat between the heat source side refrigerant and the heat medium, and

the compressor, the heat source side heat exchanger, the expansion valve, and the heat medium heat exchanger are connected by piping to one another to form a heat source side refrigerant cycle circuit.

6. The air-conditioning apparatus of claim 1 , further comprising an outside temperature sensor configured to detect a temperature of outside, wherein
when a difference between the temperature of the outside air and a predetermined air handling side set temperature increases, the air handling unit controller controls the air handling side flow rate control valve to increase a flow rate of the heat medium that flows through the air handling side heat exchanger.

7. The air-conditioning apparatus of claim 1 ,
wherein the air handling unit controller is configured to control the air handling side flow rate control valve to adjust, on a basis of an amount of heat that is exchanged in the air handling side heat exchanger and an amount of heat required by the air handling side heat exchanger, a flow rate of the heat medium that flows through the air handling side heat exchanger.

8. The air-conditioning apparatus of claim 1 , further comprising
an indoor side flow rate control valve configured to adjust a flow rate of a heat medium that flows into and out from the indoor side heat exchanger;
an indoor inlet side temperature sensor configured to detect a temperature of the heat medium that flows into the indoor side heat exchanger;
an indoor outlet side temperature sensor configured to detect a temperature of the heat medium that flows out from the indoor side heat exchanger;
an indoor inlet side pressure sensor configured to detect a pressure of a heat medium that flows into the indoor side flow rate control valve;
an indoor outlet side pressure sensor configured to detect a pressure of a heat medium that flows out from the indoor side flow rate control device;
an indoor unit controller configured to calculate, on a basis of the temperature detected by the indoor inlet side temperature sensor, the temperature detected by the indoor outlet side temperature sensor, the pressure detected by the indoor inlet side pressure sensor, the pressure detected by the indoor outlet side pressure sensor, and an opening degree of the indoor side flow rate control valve, an amount of heat that is exchanged in the indoor side heat exchanger;
wherein the heat source side unit controller changes, on a basis of a sum of an amount of heat that is excha

Assignees

• Mitsubishi Electric Corp

Inventors

• Tsuji Yusuke
• Kadowaki Kimitaka
• Azuma Koji
• Okoshi Yasushi

Classifications

• F25B2600/2513

  Expansion valves · CPC title

• F25B2313/0231

  with simultaneous cooling and heating · CPC title

• F25B30/02

  of the compression type · CPC title

• F25B1/04

  with compressor of rotary type ({F25B1/005,} F25B1/10 take precedence) · CPC title

• F24F2221/54

  Heating and cooling, simultaneously or alternatively · CPC title