A dehumidification air conditioner reduces carbon dioxide levels in a low humidity workroom. Cooling dehumidification is performed on outdoor air in a pre-air-cooler to produce pre-cooled air, which is branched such that a first part passes through a processing zone of an adsorption rotor which can remove carbon dioxide and humidity simultaneously, and a second part passes through a purge zone of the adsorption rotor. Air which passed through the processing zone is supplied to a low humidity workroom. Air which passed though the purge zone of the adsorption rotor is mixed with outdoor air and then heated with a reproduction heater to produce heated air. The heated air is sent to a reproduction zone of the adsorption rotor, to simultaneously remove carbon dioxide and humidity from the adsorption rotor and produce an exhaust stream which exhausted out of the device.

Various embodiments provide a make-up air unit, comprising a first air inlet defining a portion of a first path and a portion of a second path; a second air inlet defining a third path that joins with the first path; a dehumidification unit disposed within the first path; an air conditioner with a portion of the air conditioner disposed within the first path downstream of where the third path joins the first path, and a portion of the air conditioner disposed within the third path; a first air outlet where the first path exits the make-up air unit; and a second air outlet wherein the second path exits the make-up air unit; wherein the air conditioner is disposed on a stand; wherein the dehumidification unit is disposed below the air conditioner; and wherein the first path is isolated from the third path.

Various embodiments provide a make-up air unit, comprising a first air inlet defining a portion of a first path and a portion of a second path; a second air inlet defining a third path that joins with the first path; a dehumidification unit disposed within the first path; an air conditioner with a portion of the air conditioner disposed within the first path downstream of where the third path joins the first path, and a portion of the air conditioner disposed within the third path; a first air outlet where the first path exits the make-up air unit; and a second air outlet wherein the second path exits the make-up air unit; wherein the air conditioner is disposed on a stand; wherein the dehumidification unit is disposed below the air conditioner; and wherein the first path is isolated from the third path.

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.

An evaporator coil system includes a segmented evaporator coil. The segmented evaporator coil includes a primary segment and a secondary segment. A first plurality of evaporator circuit lines are fluidly coupled to the primary segment and a second plurality of evaporator circuit lines are fluidly coupled to the secondary segment. A suction line includes a first connection fluidly coupled to the primary segment and a second connection fluidly coupled to the secondary segment. A valve is arranged in fluid communication with the secondary segment so as to selectively restrict refrigerant flow through the secondary segment.

A dehumidification system includes a compressor, a primary evaporator, a primary condenser, a secondary evaporator, a secondary condenser, a plurality of posts, and a drain pan. The secondary evaporator receives an inlet airflow and outputs a first airflow to the primary evaporator. The primary evaporator receives the first airflow and outputs a second airflow to the secondary condenser. The drain pan captures water removed from the first airflow by the primary evaporator. The secondary condenser receives the second airflow and outputs a third airflow to the primary condenser. The primary condenser receives the third airflow and outputs a fourth airflow. The compressor receives a flow of refrigerant from the primary evaporator and provides the flow of refrigerant to the primary condenser.

A dehumidification system includes a compressor, a primary evaporator, a primary condenser, a secondary evaporator, a secondary condenser, a plurality of posts, and a drain pan. The secondary evaporator receives an inlet airflow and outputs a first airflow to the primary evaporator. The primary evaporator receives the first airflow and outputs a second airflow to the secondary condenser. The drain pan captures water removed from the first airflow by the primary evaporator. The secondary condenser receives the second airflow and outputs a third airflow to the primary condenser. The primary condenser receives the third airflow and outputs a fourth airflow. The compressor receives a flow of refrigerant from the primary evaporator and provides the flow of refrigerant to the primary condenser.

A dehumidifier appliance may include a cabinet, a refrigeration assembly, an air handler, and a condensate collection tray. A controller is configured to initiate a dehumidification cycle, determine that the dehumidification cycle has failed, prompt a user to confirm that all external sources of humidity are blocked, receive user confirmation that all external sources of humidity are blocked, determine that the dehumidification cycle is still failing after receiving the user confirmation, and identify a fault with the dehumidifier appliance.

A dehumidifier appliance may include a cabinet, a refrigeration assembly, an air handler, and a condensate collection tray. A controller is configured to initiate a dehumidification cycle, determine that the dehumidification cycle has failed, prompt a user to confirm that all external sources of humidity are blocked, receive user confirmation that all external sources of humidity are blocked, determine that the dehumidification cycle is still failing after receiving the user confirmation, and identify a fault with the dehumidifier appliance.

A dehumidification system includes a compressor, a primary evaporator, a primary condenser, a secondary evaporator, a secondary condenser, a modulating valve, and a liquid-cooled alternate condenser. The secondary evaporator receives an inlet airflow and outputs a first airflow to the primary evaporator. The primary evaporator receives the first airflow and outputs a second airflow to the secondary condenser. The secondary condenser receives the second airflow and outputs a third airflow to the primary condenser. The primary condenser receives the third airflow and outputs a dehumidified airflow. The compressor receives a flow of refrigerant from the primary evaporator and provides the flow of refrigerant to the modulating valve. The modulating valve directs the flow of refrigerant to the primary condenser and to the alternate condenser. The alternate condenser receives a portion of the flow of refrigerant and transfers heat from the refrigerant to a flow of fluid.