Variable refrigerant flow (VRF) dehumidification system

Patent metadata

Field	Value
Publication number	US-11215371-B2
Application number	US-201916511382-A
Country	US
Kind code	B2
Filing date	Jul 15, 2019
Priority date	Jul 17, 2018
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A Variable Refrigerant Flow (VRF) dehumidification system. The system has at least one condenser module in fluid communication with one or more indoor air handlers. At least one evaporator coil is in fluid communication with the indoor air handlers and at least one reheat/reclaim coil. The evaporator and reheat/reclaim coils are also in communication with the condenser module. A plurality of electronic expansion valves (EEVs) are in fluid communication with the indoor air handlers. A plurality of sensors is disposed in the system and are in communication with at least one VRF dehumidification system controller. In one embodiment, a logic is stored in a non-transitory computer readable medium that, when executed by one or more processors, causes the VRF dehumidification system to monitor the data input from the plurality of sensors and regulates the capacity of the VRF dehumidification system needed to maintain a set dew point parameter.

First claim

I claim:

1. A method for controlling a variable refrigerant flow dehumidification system, the method comprising:
detecting an air temperature using an air temperature sensor;
detecting a dewpoint inside a structure using a dewpoint sensor;
transmitting data including the air temperature and the dewpoint between the air temperature sensor and the dewpoint sensor and a system controller;
initiating a dehumidification process in response to the air temperature and the dewpoint using the system controller, the system controller including logic to execute instructions including:
setting a first heating temperature parameter on an electronic expansion valve between 86 and 102 degrees for a reheat/reclaim coil; and
setting a first cooling temperature parameter on an electronic expansion valve between 38 and 46 degrees for a primary evaporator coil;

detecting the first cooling temperature parameter via a cooling discharge sensor on air leaving the primary evaporator coil;
detecting the first heating temperature parameter via a heating discharge sensor on air leaving the reheat/reclaim coil;
detecting a temperature of supply air via a supply air temperature sensor;
communicating the supply air temperature to the system controller;
receiving data from a building management system by the system controller;
adjusting a speed of an air handler by the system controller;
further detecting the air temperature using the air temperature sensor and further detecting the dewpoint inside using the dewpoint sensor, and transmitting data including the further detected air temperature and the dewpoint to the system controller;
detecting an outside air temperature using an outside air temperature sensor located outside the structure; and
detecting an outside dewpoint using an outside dewpoint sensor located outside the structure;
transmitting data including the outside air temperature and the outside dewpoint between the outside air temperature sensor and the outside dewpoint sensor and the system controller; and
regulating capacity of the dehumidification system to maintain a set dew point parameter in response to the further detected air temperature and the further detected dewpoint and the data including the outside air temperature and the outside dewpoint.

Assignees

• Hussmann Corp

Inventors

• O'Brian John

Classifications

• F24F11/63

  Electronic processing · CPC title

• F25B13/00

  Compression machines, plants or systems, with reversible cycle (defrosting cycles F25B47/02) · CPC title

• F24F2110/20

  Humidity · CPC title

• F24F2110/22

  of the outside air · CPC title

• F25B49/027

  Condenser control arrangements · CPC title