System and method for controlling an outdoor air conditioner

Patent metadata

Field	Value
Publication number	US-10107509-B2
Application number	US-201414550191-A
Country	US
Kind code	B2
Filing date	Nov 21, 2014
Priority date	Nov 21, 2014
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

An air conditioning system is provided, including: an outdoor air conditioner, configured to cool outdoor air at an outdoor temperature into dehumidified air at a dehumidified temperature, to heat the dehumidified air into supply air at a supply air temperature, and to provide the supply air to a plurality of rooms; a plurality of indoor air conditioners provided inside the plurality of rooms, respectively, each indoor air conditioner being configured to draw in input air at an input temperature, to heat or cool the input air into output air at an output temperature, and to provide the output air to a corresponding room; a control circuit configured to determine whether an air conditioning load exists in a set number of the plurality of rooms, and to adjust operation of the outdoor air conditioner to set the supply air temperature based on whether the air conditioning load is determined to exist.

First claim

What is claimed is:

1. An air conditioning system, comprising:
an outdoor air conditioner provided outside a structure, configured to cool outdoor air at an outdoor temperature into dehumidified air at a dehumidified temperature, configured to heat the dehumidified air to a supply air temperature, and configured to provide the dehumidified air as supply air to a plurality of air-conditioning spaces inside the structure;
a plurality of indoor air conditioners provided inside the plurality of air-conditioning spaces, respectively, each of the plurality of indoor air conditioners being configured to draw in input air from a corresponding air-conditioning space at an input temperature, configured to heat or cool the input air to an output temperature, and configured to provide the input air as output air to the corresponding air-conditioning space; and
a control circuit configured to individually determine whether an air conditioning load exists in each of the plurality of air conditioning spaces, determine whether a number of the plurality of air-conditioning spaces for which an air conditioning load exists is greater than a set threshold, and to adjust operation of the outdoor air conditioner to set the supply air temperature based on whether the number of the plurality of air conditioning spaces for which an air conditioning load exists is greater than the set threshold.

2. The air conditioning system of claim 1 , wherein the control circuit is further configured to set the supply air temperature to either a maximum temperature or an adjusted temperature.

3. The air conditioning system of claim 1 , wherein the adjusted temperature is the dehumidification temperature.

4. The air conditioning system of claim 1 , wherein
a plurality of desired temperatures are set for the plurality of air-conditioning spaces, respectively, and
the adjusted temperature is a highest temperature of the plurality of desired temperatures.

5. The air conditioning system of claim 1 , wherein
a plurality of desired temperatures are set for the plurality of air-conditioning spaces, respectively, and
the adjusted temperature is a highest temperature of the plurality of desired temperatures modified by an adjustment value.

6. The air conditioning system of claim 1 , wherein
a plurality of desired temperatures are set for the plurality of air-conditioning spaces, respectively, and
the adjusted temperature is an average temperature of the plurality of desired temperatures.

7. The air conditioning system of claim 1 , wherein
a plurality of desired temperatures are set for the plurality of air-conditioning spaces, respectively, and
the adjusted temperature is an average temperature of the plurality of desired temperatures modified by an adjustment value.

8. The air conditioning system of claim 1 , wherein
a plurality of desired temperatures are set for the plurality of air-conditioning spaces, respectively, and
the adjusted temperature is a median temperature of the plurality of desired temperatures.

9. The air conditioning system of claim 1 , wherein the maximum temperature is a highest temperature of the plurality of output temperatures.

10. The air conditioning system of claim 1 , wherein the set number of the plurality of indoor air conditioners is all of the plurality of indoor air conditioners.

11. The air conditioning system of claim 1 , wherein the input air is the supply air, and the output air is indoor air.

12. The air conditioning system of claim 1 , wherein the input air is indoor air from the indoor air-conditioning space, and the output air is conditioned indoor air.

13. The air conditioning system of claim 1 , wherein
the control circuit further comprises an indoor air conditioner operation sensor configured to determine whether the set number of the indoor air conditioners are currently operating, and
the control circuit is further configured to determine whether the air conditioning load exists based on whether the indoor air conditioner operation sensor determines that the set number of the indoor air conditioners are currently operating.

14. The air conditioning system of claim 1 , wherein
the control circuit further comprises a solar radiation sensor configured to detect an amount of solar radiation incident on the structure, and
the control circuit is further configured to determine whether the air conditioning load exists based on whether the detected amount of solar radiation exceeds a solar radiation threshold.

15. The air conditioning system of claim 1 , wherein
the control circuit further comprises an energy consumption sensor configured to detect an energy consumption of the air conditioning system, and
the control circuit is further configured to determine whether the air conditioning load exists based on whether the detected energy consumption exceeds an energy consumption threshold.

16. The air conditioning system of claim 1 , wherein
the control circuit further comprises a clock configured to determine a current time of day, and
the control circuit is further configured to determine whether the air conditioning load exists based on whether the current time of day falls within a set time range.

17. The air conditioning system of claim 1 , wherein
the control circuit further comprises a calendar circuit configured to determine a current date, and
the control circuit is further configured to determine whether the air conditioning load exists based on whether the current date falls within a set date range.

18. The air conditioning system of claim 1 , wherein
the control circuit further comprises an outdoor temperature sensor configured to detect the outdoor temperature, and
the control circuit is further configured to determine whether the air conditioning load exists based on whether the outdoor temperature is above an outdoor temperature threshold.

19. The air conditioning system of claim 1 , further comprising
a solar radiation sensor configured to detect an amount of solar radiation incident upon a selected one of the plurality of air-conditioning spaces,
wherein
the control circuit is further configured to determine whether the air conditioning load exists in the selected one of the plurality of air-conditioning spaces based on the detected amount of solar radiation incident upon the selected one of the plurality of air-conditioning spaces.

20. The air conditioning system of claim 1 , further comprising
an air conditioning area population sensor configured to detect an actual or approximate number of people in a selected one of the plurality of air-conditioning spaces,
wherein
the control circuit is further configured to determine whether the air conditioning load exists in the selected one of the plurality of air-conditioning spaces based on the detected actual or approximate number of people in the selected one of the plurality of air-conditioning spaces.

21. The air conditioning system of claim 1 , further comprising
an indoor air-conditioner operation sensor configured to detect whether a selected one of the plurality of indoor air conditioners are currently operating to heat or cool the input air in a selected one of the plurality of air-conditioning spaces,
wherein
the control circuit is further configured to determine whether the air conditioning load exists in the selected one of the plurality of air-conditioning spaces based on whether the selected one of the plurality of indoor air conditioners is currently operating to heat or cool the

Assignees

• Mitsubishi Electric Corp

Inventors

• Ito Shinichi
• Nomoto So
• Sakai Daisuke

Classifications

• F24F11/30

  for purposes related to the operation of the system, e.g. for safety or monitoring · CPC title

• F24F2110/12

  of the outside air · CPC title

• F24F2120/10

  Occupancy · CPC title

• F24F2130/20

  Sunlight · CPC title

• F24F11/62

  characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values · CPC title