Comfort temperature control system for a zone

• US 3,870,227 A
• Filed: 08/10/1972
• Issued: 03/11/1975
• Est. Priority Date: 08/10/1972
• Status: Expired due to Term

• Current Assignee: Ranco Incorporated of Delaware (Schneider Electric SE)
• Original Assignee: Russell G. Attridge Jr
• Inventors: Attridge, Russell G. Jr.
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US05/279,743
• Time in Patent Office: 943 Days
• Field of Search: 236/49,1B,1C,91 165/16,26,27 98/33
• US Class Current: 236/49.3
• 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 11/62 characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
• CPC Class Codes: F24F 11/81 by controlling the air supply to heat-exchangers or bypass channels
• CPC Class Codes: F24F 11/88 Electrical aspects, e.g. circuits
• CPC Class Codes: F24F 3/048 with temperature control at constant rate of air-flow

Abstract

The temperature in a zone is regulated by diverting more or less of a given flow of tempered air into and through the zone in accordance with the degree of variance from a set point temperature in the zone and the temperature of the flow of tempered air is regulated according to the variation from a set point of the resulting temperature of the air passed through the zone and recombined with that portion of the flow of tempered air which was undiverted into the zone.

Claims

1. A method of controlling temperatures in a zone comprising:

a. providing a fluid tempering system comprising fluid tempering means and a fluid circulating system for directing a given flow of fluid from said tempering means toward the zone and for returning said flow of fluid from said zone towards said tempering means, said system providing for a variable flow of fluid to said zone and for bypassing the remaining fluid of said given flow around said zone;

b. sensing the temperature in said zone;

c. altering the flow of fluid to bypass more or less fluid around said zone in response to sensed changes in zone temperature to maintain a predetermined zone temperature level;

d. mixing the fluid which has flowed to the zone with the fluid which has been bypassed around the zone;

e. sensing the temperature of the mixed zone and bypass fluids to determine the load on said zone;

f. controlling the temperature of said given flow of fluid flowing toward said zone in response to the sensed temperature of the mixed zone and bypass fluids; and

, g. maintaining the flow rate of fluid to the zone relatively constant except when the load on the zone changes substantially and abruptly.

2. A method as claimed in claim 1 further including sensing the temperature of fluid directed from the tempering means towards the zone and affecting operation of the tempering means in response thereto.

3. A method as claimed in claim 1 further including maintaining the temperature of the mixed zone and bypass fluids substantially at a predetermined level.