Air conditioning apparatus

Patent metadata

Field	Value
Publication number	US-10139144-B2
Application number	US-201515535689-A
Country	US
Kind code	B2
Filing date	Dec 7, 2015
Priority date	Dec 15, 2014
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A controller of an air conditioning apparatus performs a start/stop frequency-reducing rotation speed control in which the rotation speed of a compressor is controlled based on request values from indoor units requesting a decrease in air conditioning capacity, disregarding request values from indoor units requesting an increase in air conditioning capacity, when each indoor temperature at all indoor units performing air conditioning operation is within a scope of a prescribed threshold temperature range surrounding a target indoor temperature at each indoor unit performing air conditioning operation.

First claim

What is claimed is:

1. An air conditioning apparatus
a plurality of indoor units;
an outdoor unit having a compressor, the air conditioning apparatus performing an air conditioning operation so that an indoor temperature at each indoor unit arrives at a target indoor temperature at each indoor unit; and
a controller configured to control a rotation speed of the compressor based on a request value concerning air conditioning capacity at each indoor unit during the air conditioning operation,
the controller performing a start/stop frequency-reducing rotation speed control in which the rotation speed of the compressor is controlled based on of the request values from the indoor units requesting a decrease in air conditioning capacity, disregarding the request values from the indoor units requesting an increase in air conditioning capacity, when each indoor temperature at all indoor units performing the air conditioning operation is within a scope of a prescribed threshold temperature range surrounding the target indoor temperature at each indoor unit performing the air conditioning operation.

2. The air conditioning apparatus according to claim 1 , wherein
the start/stop frequency-reducing rotation speed control is performed to control the rotation speed of the compressor based on the request value for which an extent of decrease in air conditioning capacity is smallest among the request values from the indoor units requesting a decrease in air conditioning capacity.

3. The air conditioning apparatus according to claim 2 , wherein
the threshold temperature range is a thermo temperature range that specifies a timing of
indoor thermo-off, which suspends the air conditioning operations of the indoor units perforating the air conditioning operations, and
indoor thermo-on, which restarts the air conditioning operations of the indoor units in the indoor thermo-off state.

4. The air conditioning apparatus according to claim 3 , wherein the controller performs a normal rotation speed control in which the rotation speed of the compressor is controlled based on the request value for which an extent of increase in air conditioning capacity is greatest among the request values from the indoor units requesting an increase in air conditioning capacity, when there are indoor units for which the indoor temperature is beyond the scope of the threshold temperature range and increase in air conditioning capacity is being requested among the indoor units performing the air conditioning operations.

5. The air conditioning apparatus according to claim 2 , wherein
the controller performs a normal rotation speed control in which the rotation speed of the compressor is controlled based on the request value for which an extent of increase in air conditioning capacity is greatest among the request values from the indoor units requesting an increase in air conditioning capacity, when there are indoor units for which the indoor temperature is beyond the scope of the threshold temperature range and increase in air conditioning capacity is being requested among the indoor units performing the air conditioning operations.

6. The air conditioning apparatus according to claim 1 , wherein
the threshold temperature range is a thermo temperature range that specifies a timing of
indoor thermo-off, which suspends the air conditioning operations of the indoor units perforating the air conditioning operations, and
indoor thermo-on, which restarts the air conditioning operations of the indoor units in the indoor then-no-off state.

7. The air conditioning apparatus according to claim 6 , wherein
the controller performs a normal rotation speed control in which the rotation speed of the compressor is controlled based on the request value for which an extent of increase in air conditioning capacity is greatest among the request values from the indoor units requesting an increase in air conditioning capacity, when there are indoor units for which the indoor temperature is beyond the scope of the threshold temperature range and increase in air conditioning capacity is being requested among the indoor units performing the air conditioning operations.

8. The air conditioning apparatus according to claim 1 , wherein
the controller performs a normal rotation speed control in which the rotation speed of the compressor is controlled based on the request value for which an extent of increase in air conditioning capacity is greatest among the request values from the indoor units requesting an increase in air conditioning capacity, when there are indoor units for which the indoor temperature is beyond the scope of the threshold temperature range and increase in air conditioning capacity is being requested among the indoor units performing the air conditioning operations.

Assignees

• Daikin Ind Ltd

Inventors

• Tsuji Yoshiyuki
• Hori Yasushi
• Takakura Mariko
• Oka Yuusuke

Classifications

• F25B2700/1933

  Suction pressures · CPC title

• F25B2313/0314

  Temperature sensors near the indoor heat exchanger · CPC title

• F25B2600/0253

  with variable speed · CPC title

• F25B2600/0251

  with on-off operation · CPC title

• F25B2313/0233

  in parallel arrangements · CPC title