AIR CONDITIONING SYSTEM

• US 3,693,704 A
• Filed: 09/11/1970
• Issued: 09/26/1972
• Est. Priority Date: 09/11/1970
• Status: Expired due to Term

• Current Assignee: York International Corporation (Johnson Controls International plc)
• Original Assignee: Alwin B. Newton
• Inventors: Newton, Alwin B.
• Primary Examiner(s): Sukalo, Charles
• Application Number:
  US05/071,550
• Time in Patent Office: 746 Days
• Field of Search: 165/14,19,20,21,22,50
• US Class Current: 165/221
• CPC Class Codes: F24F 11/83 by controlling the supply of heat-exchange fluids to heat-exchangers
• CPC Class Codes: F24F 3/08 with separate supply and return lines for hot and cold heat-exchange fluids i.e. so-called "4-conduit" system

Abstract

An air conditioning system employing separate chilled water and heated water single pipe loops and designed for use with individual room air conditioning units (inductor or fan-coil) equipped with separate heating and cooling heat exchange coils. The system provides local control at each unit, for both heating and cooling at all times when the heated water and chilled water circuits are active, as each circuit in the unit includes a circulating pump and coil, the pumps being under thermostatic control responsive to room temperature requirement.

Claims

1. A multi-room air conditioning system comprising:

A. a plurality of room air conditioning units located in a plurality of zones subject to various thermal loads, each said conditioning unit including;

1. a liquid to air heat exchanger having a chilled liquid coil and a heated liquid coil, and 2. means for circulating room air in series flow over both said coils;

a heater adapted to heat a liquid heat exchange medium;

C. a chiller adapted to cool a liquid heat exchange medium;

D. a first closed circuit conduit system interconnecting said chilled liquid coils of said heat exchangers and said chiller, said system including;

1. a first main conduit, 2. individual inlet conduits connected between said first main conduit and the inlet side of said chilled liquid coils, 3. individual return conduits connected between said first main conduit and the outlet side of said chilled liquid coils; and

4. a first pump for circulating chilled liquid through said first main conduit and said chiller;

E. a second closed circuit conduit system interconnecting said heated liquid coils of said heat exchangers and said heater, said system including;

1. a second main conduit, 2. individual inlet conduits connected between said second main conduit and the inlet side of said heated liquid coils;

3. individual return conduits connected between said second main conduit and the outlet side of said heated liquid coils; and

4. a second pump for circulating heated liquid through said first main conduit and said heater; and

F. means for controlling the flow of chilled liquid from said first inlet conduits to said chilled liquid coils;

G. means for controlling the flow of heated liquid from said second inlet conduit to said heated liquid coils;

one of said controlling means including pumps associated with the inlet conduits of one of said conduIt systems and individually operable to control the flow of liquid from the main conduit of said one conduit system to the coils connected thereto.

2. a third electric circuit in parallel with said second circuit and including a switch operable by said humidistat to establish said third electric circuit when said thermostatically controlled switch is in its first position establishing said first circuit.

3. individual return conduits connected between said first main conduit and the outlet side of said chilled liquid coils;

and

4. a second pump for circulating heated liquid through said first main conduit and said heater;

and F. means for controlling the flow of chilled liquid from said first inlet conduits to said chilled liquid coils;

G. means for controlling the flow of heated liquid from said second inlet conduit to said heated liquid coils;

one of said controlling means including pumps associated with the inlet conduits of one of said conduIt systems and individually operable to control the flow of liquid from the main conduit of said one conduit system to the coils connected thereto.

5. A system as defined in claim 4 wherein said temperature control means includes:

A. a thermostat in each zone and responsive to the temperature of the zone; and

B. electric circuits for selectively energizing said heated liquid and chilled liquid pumps of the air conditioning unit in the zone and including;

6. A system as defined in claim 2 including:

A. temperature control means associated with at least one of said room units, said control means being operative to control said pumps to effect selective operation thereof to effect heat transfer between the circulating heat exchange medium and the air in said zones only upon a demand for cooling and upon a demand for heating, said temperature control means including;

7. A system as defined in claim 4 wherein said temperature control means includes:

A. a thermostat in at least one zone and responsive to the temperature of said zone; and

B. electric circuits for selectively energizing said heated liquid and chilled liquid pumps of the air conditioning unit in the zone and including;