Hydronic interface system, method and apparatus

• US 5,586,449 A
• Filed: 09/20/1994
• Issued: 12/24/1996
• Est. Priority Date: 07/02/1993
• Status: Expired due to Term

• Current Assignee: Brdg-Tndr Corporation
• Original Assignee: Brdg-Tndr Corporation
• Inventors: Krist, Gene
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US08/309,090
• Time in Patent Office: 826 Days
• Field of Search: 62/179, 62/201, 237/8 R, 165/37
• US Class Current: 62/179
• CPC Class Codes: G05D 23/1919 characterised by the type of controller
• CPC Class Codes: G05D 23/1934 each space being provided with one sensor acting on one or more control means

Abstract

A method and apparatus for coupling a primary loop with a secondary loop for circulating processing fluids therebetween comprising in combination: a first connection for the feed line of the primary loop and a second connection for the return line of the primary loop; a third connection for the feed line of the secondary loop and a fourth connection for the return line of the secondary loop; a crossover line coupling the four connections; first valve means for controlling the flow through the secondary loop; first sensor means responsive to the temperature associated with the secondary loop to control the first valve means; second valve means in the path of flow through the crossover line; and second sensor means responsive to the flow of the process fluid across the crossover line to control the second valve means.

Claims

1. Apparatus for coupling a primary loop with a secondary loop for circulating processing fluids therebetween comprising in combination:

a first connection for the feed line of the primary loop and a second connection for the return line of the primary loop;

a third connection for the feed line of the secondary loop and a fourth connection for the return line of the secondary loop;

a crossover line coupling the four connections;

first valve means for controlling the flow through the primary loop;

first sensor means responsive to the temperature associated with the secondary loop to control the first valve means, the first sensor means including a supply temperature sensor and a return temperature sensor;

second valve means in the path of flow through the crossover line; and

second sensor means responsive to the flow of the process fluid across the crossover line to control the second valve means.

2. A system for cooling a flow of air at a plurality of sites comprising:

a process fluid chiller subassembly;

a plurality of air cooling subassemblies;

a primary loop for process fluid extending between the process fluid subassembly and the plurality of air cooling subassemblies;

a plurality of secondary loops coupled to the primary loop for feeding process fluid from the primary loop to the air cooling subassemblies;

means to effect flows of air to be cooled across the secondary loops at the sites to be cooled;

a plurality of fluid bridges, each bridge coupling the primary loop with a secondary loop, each bridge having feed and return orifices coupled to the feed and return lines of the primary loop and feed and return connections coupling feed and return lines of a secondary loop, and a crossover line coupling the primary and secondary loops;

a temperature responsive valve in the path of flow of the process fluid to vary the amount of fluid flow through the primary loop and temperature sensors for supply fluid and return fluid at each secondary loop to determine the temperature at the secondary loop for controlling the temperature responsive valve; and

a flow responsive valve in the crossover line for each fluid bridge and a flow sensor from each secondary loop responsive to the flow of the process fluid across the crossover line for controlling the flow responsive valve.

3. A method of controlling the temperature at a plurality of sites to be controlled comprising the steps of:

providing a process fluid generator subassembly;

providing a plurality of temperature controlling subassemblies;

providing a primary loop and a plurality of associated secondary loops extending through the air cooling subassemblies;

feeding a flow of process fluid in the primary loop and secondary loops extending between the process fluid generator subassembly and the plurality of temperature controlling subassemblies;

providing a plurality of fluid bridges, each coupling the primary loop with a secondary loop, each bridge having feed and return connections coupled to the feed and return lines of the primary loop and feed and return connections coupling feed and return lines of a secondary loop, and a crossover line coupling the primary and secondary loops;

sensing the flow in each water bridge crossover line;

varying a valve in the path of flow through each crossover line in response to the sensed flow;

sensing the supply and return temperatures associated with each secondary loop; and

varying a temperature responsive valve in response to the sensed temperatures to vary the flow through the primary loop.