Heating and cooling system for a multiple coil installation

• US 4,067,383 A
• Filed: 08/04/1976
• Issued: 01/10/1978
• Est. Priority Date: 08/04/1976
• Status: Expired due to Term

• Current Assignee: William R. Padden
• Original Assignee: William R. Padden
• Inventors: Padden, William R.
• Primary Examiner(s): Myhre, Charles J.
• Assistant Examiner(s): Lall, Parshobam S.
• Application Number:
  US05/711,752
• Time in Patent Office: 524 Days
• Field of Search: 165/34, 165/36, 165/103, 165/101, 165/35, 236/1 C, 417/410
• US Class Current: 165/247
• CPC Class Codes: F24D 3/02 with forced circulation, e.g. by pumps pump constructions F04
• CPC Class Codes: F24F 3/06 characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
• CPC Class Codes: F25D 17/02 for circulating liquids, e.g. brine
• CPC Class Codes: G05D 23/1931 to control the temperature of one space

Abstract

The heating and cooling system for a multiple coil installation includes a bypass passage or conduit provided with a check valve which is closed when the pump of either the heating circuit or the cooling circuit is energized and which is opened when the pumps of the heating circuit and the cooling circuit are not energized whereby a third pump which operates continuously, is effective when the check valve is open to continuously circulate the water in a closed path through the bypass circuit which is interconnected to the inlet and outlet sides of the multiple coil installation, thus bypassing the heating and cooling circuits.

Claims

1. A heating and cooling system for supplying hot or cold water to a multiple coil installation comprising a heating circuit, a cooling circuit and a bypass circuit, said heating circuit including, a water reservoir, a temperature sensing control and a first pump, said cooling circuit including said water reservoir, a temperature sensing control and a second pump, a first conduit intersecting said heating and cooling circuits and extending to the inlet side of the multiple coil installation, a second conduit connecting the outlet side of the multiple coil unit with said reservoir, said bypass circuit including a third conduit connecting said first and second conduits, a check valve in said third circuit, and a third pump in said first conduit downstream of the intersection of said first and third conduits, said third pump being continuously energized when the system is in a heating or cooling mode, and control means for energizing said first pump or said second pump to circulate hot or cold water through said heating or cooling circuit respectively, one of said first or second pumps being energized and the other one of said first or second pump being energized depending on whether the system is in the heating mode or cooling mode, said check valve being closed in said third conduit while said first pump or said second pump is energized, and remaining closed until the temperature sensing control of the heating or cooling circuit shuts off the corresponding first or second pump after which time said check valve opens, whereby the water from the multiple coil installation is circulated by said third pump in a closed path through said bypass circuit, said conduits and the multiple coil installation, thus bypassing said heating and cooling circuits, said first and second pumps both being deenergized when said bypass circuit is opened.

2. The heating and cooling sytstem defined in claim 1 wherein said check valve is maintained closed as a result of the back pressure of said first or second pump when energized.

3. The heating and cooling system defined in claim 1 wherein each temperature sensing control is in the form of an aquastat.

4. The heating and cooling system defined in claim 1 wherein said heating circuit includes a generator for heating the water and said cooling circuit includes a tank for cooling the water.

5. The heating and cooling system defined in claim 4 wherein said heating circuit includes a loop between the outlet side of the generator and the discharge side of said second pump, with a ball check valve movable in said loop depending on whether the first or second pump is energized to open the discharge side of said second pump and to close the outlet side of said generator during the cooling mode and to close the discharge side of said second pump and to open the outlet side of said generator during the heating mode.

6. The heating and cooling system defined in claim 5 wherein said ball check valve in said loop is maintained closed during the heating mode or cooling mode, as a result of the discharge pressure of said first or second pump when energized acting in said loop against said ball check valve.

7. The heating and cooling system defined in claim 6 wherein each temperature sensing control is in the form of an aquastat.