Refrigeration circuit with reheat coil

A refrigeration system comprising:

• a supply air duct;
• an indoor heat exchange coil operably positioned in the supply air duct;
• a reheat heat exchange coil operably positioned in the supply air duct;
• an outdoor heat exchange coil;
• at least one compressor;
• an expansion device;
• refrigeration system tubing connected to and serially arranging the compressor, the outdoor heat exchange coil, the expansion device and the indoor coil into a refrigeration circuit;
• reheat tubing connecting the reheat coil to the refrigeration tubing so as to arrange the reheat coil in a parallel circuited arrangement with the outdoor heat exchange coil and in a series circuited arrangement with the compressor, the expansion device and the indoor heat exchange coil;
• and
• a valve in the reheat tubing operable to control refrigerant flow through the reheat coil wherein the valve is a liquid flow control valve located between the receiver and the reheat coil, and wherein the valve is controlled responsive to a supply air duct condition.

A method of arranging a refrigeration system including an indoor heat exchanger, a reheat coil, an expansion device, an outdoor heat exchanger, and a compressor comprising the steps of:

• placing the indoor heat exchanger in a supply air stream;
• placing the reheat coil in the supply air stream;
• sequentially linking the compressor, the outdoor heat exchanger, the expansion device and the indoor heat exchanger with tubing into a first refrigeration circuit;
• linking the reheat coil, with additional tubing, to the first refrigeration circuit so as to place the reheat coil in a series arrangement with the compressor, expansion device, and indoor heat exchanger, and in a parallel arrangement with the outdoor heat exchanger;
• placing a subcooler in the refrigeration circuit between the expansion device and the parallel arrangement;
• adding a receiver between the subcooler and the parallel arrangement;
• and
• sizing the receiver to contain a volume of refrigerant greater than or equal to the volume of refrigerant contained by the reheat coil.

A method of controlling reheat in a refrigeration system including an outdoor coil in parallel arrangement with a reheat coil and including a control valve downstream of the reheat coil, the method comprising the steps of:

• closing the control valve to block flow from the reheat coil thereby causing refrigerant to condense within the reheat coil until the reheat coil is completely filled with liquid;
• opening the control valve slightly to allow refrigerant to flow out of the reheat coil and cause condensation to begin to occur in the reheat coil;
• and
• opening the control valve completely to expose more coil surface of the reheat coil and cause the reheat coil to be more active in a condensation process.

A refrigeration system comprising:

• a reheat coil;
• a control valve;
• an outdoor coil;
• first refrigerant tubing operably connected to the outdoor coil, the reheat and the control valve to place the reheat coil and valve in a series arrangement with the control valve downstream of the reheat coil and to place the outdoor coil in a parallel arrangement with the reheat coil and the control valve.
• an indoor heat exchange coil operably connected in series with the parallel arrangement and the control valve;
• and
• a subcooler and operably connected by second refrigerant tubing between the indoor heat exchange coil and the parallel arrangement;
• wherein the subcooler is located in physical proximity to the outdoor heat exchange coil;
• further including receiver tubing downstream of the subcooler wherein the receiver tubing is sized a greater diameter than the first and second refrigerant tubing.

A refrigeration system comprising:

• a reheat coil;
• a control valve;
• an outdoor coil;
• first refrigerant tubing operably connected to the outdoor coil, the reheat and the control valve to place the reheat coil and valve in a series arrangement with the control valve downstream of the reheat coil and to place the outdoor coil in a parallel arrangement with the reheat coil and the control valve;
• an indoor heat exchange coil operably connected in series with the parallel arrangement and the control valve;
• and
• a subcooler and operably connected by second refrigerant tubing between the indoor heat exchange coil and the parallel arrangement;
• wherein the subcooler and the reheat coil are located in a supply air duct in physical proximity to each other.