OPTIMIZING SYSTEM FOR A PLURALITY OF TEMPERATURE CONDITIONING APPARATUSES

• US 3,555,251 A
• Filed: 12/06/1967
• Issued: 01/12/1971
• Est. Priority Date: 12/06/1967
• Status: Expired due to Term

• Current Assignee: Shavit Gideon
• Original Assignee: Shavit Gideon
• Inventors: SHAVIT GIDEON
• Application Number:
  US04/688,613
• Time in Patent Office: 1,133 Days
• US Class Current: 700/286
• CPC Class Codes: F24F 11/00 Control or safety arrangements
• 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 11/46 Improving electric energy efficiency or saving
• CPC Class Codes: F24F 11/63 Electronic processing
• CPC Class Codes: F24F 11/64 using pre-stored data
• CPC Class Codes: F24F 11/86 by controlling compressors within refrigeration or heat pump circuits
• CPC Class Codes: F24F 2110/10 Temperature
• CPC Class Codes: F24F 2140/00 Control inputs relating to system states
• CPC Class Codes: F24F 2221/56 Cooling being a secondary aspect
• CPC Class Codes: G05D 23/1917 using digital means
• CPC Class Codes: G05D 23/20 with sensing elements having variation of electric or magnetic properties with change of temperature G05D23/13 takes precedence
• CPC Class Codes: Y10S 236/08 Computer

Abstract

A control system for optimizing the operation of a plurality of electrical power operated temperature conditioning apparatuses wherein a digital computer periodically determines the prevailing total temperature conditioning load, selects the number of apparatuses to be energized, and distributes the total load by using efficiency data stored in the computer for each apparatus to thereby operate each apparatus to supply a selected portion of the total at a minimum total electrical power consumption for all the apparatuses.

Claims

1. A control system for optimizing the distribution of a temperature conditioning load among a plurality of power operated temperature conditioning apparatuses by selectively distributing the load to the apparatuses to obtain a minimum total power input for operation of the apparatuses, comprising:

a computer having a plurality of inputs and outputs, storage means and program means;

said storage means has stored therein data of temperature conditioning load levels and values of power input for various values of parameters of the apparatuses, said data being stored for each of the apparatuses whereby said program means can select the temperature conditioning load for each apparatus in accordance with said data to provide for the optimum combined power operation of the apparatuses;

first condition responsive means responsive to the total temperature conditioning load;

means connecting said first responsive means to one of said computer inputs whereby said computer receives a signal indicative of the total temperature conditioning load;

a plurality of second condition responsive means each being responsive to at least one parameter of each of said apparatuses;

means connecting each of said second responsive means individually to other of said computer inputs whereby said computer receives a signal indicative of an operating parameter of each apparatus;

said computer including said program means and said storage means distributing the total temperature conditioning load to said apparatuses using said parameter of each apparatus to load each apparatus at a particular power input to obtain the minimum total power input for the needed operation level of the apparatuses to provide said total temperature conditioning load;

controller means for each apparatus connected to its respective apparatus for controlling the operation thereof; and

means connecting said controller means of each apparatus individually to one of said outputs of said computer whereby said computer adjusts the operation of each apparatus to distribute the total temperature conditioning load to the apparatuses to provide a minimum total power input for all apparatuses.

2. The control system of claim 1 wherein said computer periodically updates said data stored in said storage means for each apparatus with prevailing data obtained during operation whereby updated data for each of the apparatuses is available including:

input power responsive means for each apparatus individually connected to an input of said computer, and wherein said second condition responsive means is responsive to a parameter indicative of compressor head.

3. The control system of claim 2:

wherein said storage means stores the initial value of input power and the updated value of input power for each combination of compressor head and output of each apparatus and including;

indication means connected to said computer, said indication means being energized when said updated input power exceeds said initial input power by a predetermined amount.

4. The system of claim 2 wherein said computer upon updating said data uses a first percent of the last value of said data and a second percent of the prevailing value of said data.

5. The control system of claim 1:

wherein each of said apparatuses are refrigeration water chillers having a compressor, medium cooled condenser and a water chilling evaporatOr;

said evaporators having water inlets and outlets combined to furnish chilled water to a building;

wherein said first condition responsive means comprises a differential temperature responsive means responsive to the water temperature of the water supplied to the building and returning from the building and flow responsive means responsive to the total water flow to the building whereby the building temperature conditioning load is determined by said computer;

wherein said data for each water chiller includes a thermal output versus a differential temperature with an input power for said compressor for each combination of thermal output and differential temperature, said differential temperature being the difference between the temperature of the condenser inlet water and the evaporator outlet water whereby for a particular differential temperature said program means can select the thermal output of a chiller to provide the minimum input power;

wherein said temperature and flow responsive means includes differential temperature responsive means responsive to the outlet and inlet water temperature and flow responsive means responsive to water flow of each water chiller whereby the thermal output of the water chiller is determined by said computer; and

wherein said controller means is for adjusting the outlet water temperature for each chiller.

6. The control system of claim 1:

wherein said data is periodically updated for each apparatus as data is obtained; and

wherein each of said second responsive means is responsive to a parameter indicative of compressor head.