AIR CONDITIONING CONTROLLING DEVICE AND METHOD

• US 20120192955A1
• Filed: 01/24/2012
• Published: 08/02/2012
• Est. Priority Date: 01/28/2011
• Status: Active Grant

• Current Assignee: Azbil Corporation (Azbil BioVigilant Incorporated)
• Original Assignee: Yamatake Corporation
• Inventors: Dazai, Ryouta
• Granted Patent: US 8,958,920 B2
• Time in Patent Office: Days
• US Class Current: 137/2
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/63 Electronic processing
• CPC Class Codes: F24F 11/77 by controlling the speed of ventilators
• CPC Class Codes: F24F 11/83 by controlling the supply of heat-exchange fluids to heat-exchangers
• CPC Class Codes: F24F 11/84 using valves
• CPC Class Codes: F24F 2110/10 Temperature
• CPC Class Codes: F24F 3/044 Systems in which all treatment is given in the central station, i.e. all-air systems
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
• CPC Class Codes: Y10T 137/0324 With control of flow by a condition or characteristic of a fluid

Abstract

An air conditioning controller includes a supply air temperature controller controlling a temperature of supply air provided to an air conditioner so a supply air temperature measurement value matches a supply air temperature setting value; a total air volume device measuring/calculating a total supply air volume value that is the total of the air volumes to each individual variable air volume unit; a supply air volume controller controlling an air volume of supply air to the air conditioner, depending on the total air volume value; an air volume insufficiency evaluator evaluating if the air volume is insufficient by comparing the total air volume value to a total air volume lower limit value; and a supply air temperature setter changing the supply air temperature setting value in a direction that the variable air volume unit increase the air volume, when there is an evaluation that the air volume is insufficient.

Claims

1. An air conditioning controlling device in an air conditioning system comprising a plurality of variable air volume units for controlling, depending on a load status of a controlled area, a plurality of air volumes of supply air provided to a plurality of controlled areas from an air conditioner, comprising:

a supply air temperature controller controlling a temperature of supply air provided by the air conditioner so that a supply air temperature measurement value will match a supply air temperature setting value;

an air volume insufficiency evaluator evaluating whether or not an air volume is insufficient relative to a required air volume for maintaining the environment of a controlled area; and

a supply air temperature setting device changing the supply air temperature setting value, in a direction where in the variable air volume unit will increase the air volume, when the air volume insufficiency evaluator has evaluated the air volume to be insufficient.

2. The air conditioning controlling device as set forth in claim 1, further comprising;

a total air volume deriving device measuring or calculating a total air volume value that is the sum of the air volumes supplied to each individual variable air volume unit; and

a total air volume controller controlling an air volume of supply air provided by the air conditioner, in accordance with the total air volume value;

wherein;

the air volume insufficiency evaluator evaluates if the air volume is insufficient by comparing the total air volume value to a total air volume lower limit value that has been set in advance.

3. The air conditioning controlling device as set forth in claim 1 further comprising:

a CO₂ controller controlling an outside air introduction volume to the air conditioner so that the CO₂ concentrations in a plurality of control areas match a CO₂ concentration setting value that has been set in advance;

wherein

the air volume insufficiency evaluator evaluates whether or not the air volume is insufficient by evaluating if the outside air is insufficient.

4. The air conditioning controlling device as set forth in claim 2, further comprising:

a CO₂ controller controlling an outside air introduction volume to the air conditioner so that the CO₂ concentrations in a plurality of control areas match a CO₂ concentration setting value that has been set in advance;

wherein

the air volume insufficiency evaluating means, along with evaluating whether or not the total air volume is insufficient by comparing the total air volume value with the total air volume lower limit value, also evaluate whether or not the outside air is insufficient, and evaluates the air volume as insufficient if the total air volume is insufficient and/or the outside air is insufficient.

5. An air conditioning controlling method in an air conditioning system comprising a plurality of variable air volume units for controlling, depending on a toad status of a controlled area, a plurality of air volumes of supply air provided to a plurality of controlled areas from an air conditioner, comprising:

a supply air temperature controlling step controlling a temperature of supply air provided by the air conditioner so that a supply air temperature measurement value matches a supply air temperature setting value;

an air volume insufficiency evaluating step evaluating if an air volume is insufficient relative to a required air volume maintaining the environment of a controlled area; and

a supply air temperature setting step changing the supply air temperature setting value, in a direction where in the variable air volume unit increases the air volume, when the air volume is evaluated to be insufficient.

6. The air conditioning controlling method as set forth in claim 5, further comprising:

a total air volume deriving step measuring or calculating a total air volume value that is the sum of the air volumes supplied to each individual variable air volume unit; and

a total air volume controlling step controlling an air volume of supply air provided by the air conditioner, in accordance with the total air volume value;

wherein;

the air volume insufficiency evaluating step evaluates if the air volume is insufficient by comparing the total air volume value to a total air volume lower limit value that has been set in advance,

7. The air conditioning controlling method as set forth in claim 5, further comprising:

a CO₂ controlling step controlling an outside air introduction volume to the air conditioner so that the CO₂ concentrations in a plurality of control areas match a CO₂ concentration setting value that has been set in advance;

wherein

the air volume insufficiency evaluating step evaluates if the air volume is insufficient by evaluating if the outside air is insufficient.

8. The air conditioning controlling method as set in claim 6, further comprising:

a CO₂ controlling step controlling an outside air introduction volume to the air conditioner so that the CO₂ concentrations in a plurality of control areas match a CO₂ concentration setting value that has been set in advance;

wherein

the air volume insufficiency evaluating step, along with evaluating if the total air volume is insufficient by comparing the total air volume value with the total air volume lower limit value, also evaluates whether or not the outside air is insufficient, and evaluates the air volume as insufficient if the total air volume is insufficient and/or the outside air is insufficient.