A system including a setpoint module, a summer, a control module, and an expansion valve module. The setpoint module is configured to indirectly control sub-cooling of a condenser by adjusting a superheat setpoint based on (i) a return air temperature setpoint or a supply air temperature setpoint, and (ii) an outdoor ambient temperature. The summer is configured to determine an error between the superheat setpoint and a superheat level of a compressor. The control module is configured to generate a control signal based on the error. The expansion valve module is configured to electronically control a state of an expansion valve based on the control signal.

Apparatus and method for subcooling control based on superheat setpoint control

A fault detection and diagnostics (FDD) system is provided for a refrigeration circuit having an evaporator and a compressor configured to circulate a refrigerant through the evaporator. The FDD system includes a communications interface configured to receive a measurement of a thermodynamic property affected by the refrigeration circuit and a processing circuit having a processor and memory. The processing circuit is configured to use the measured thermodynamic property to determine an expected suction entropy of the refrigerant at a suction of the compressor, use the expected suction entropy to determine an expected thermodynamic discharge property of the refrigerant at a discharge of the compressor, determine an actual thermodynamic discharge property of the refrigerant at the discharge of the compressor, and detect a fault in the refrigeration circuit by comparing the expected thermodynamic discharge property with the actual thermodynamic discharge property.

Fault detection and diagnostic system for a refrigeration circuit

A system for monitoring operational conditions of one or more HVAC units, or other machines, with a plurality of sensors for collecting operational information data and transmitting data to a storage device and a processor for analyzing and trending the data and comparing it to a list of pre-determined set points to determine variances from the data set points and identification of one or more pre-determined events and a set of preventive maintenance alerts and/or troubleshooting instructions pertaining to the events and matching of the preventive maintenance alert and/or troubleshooting instructions to at least one of the events for display of the instructions to a user for resolving the event. The system may utilize a programmable logic array with a portable sensing unit, be capable of monitoring multiple parameters, including temperature, pressure, air flow, voltage, current, and humidity and interconnect to remote stations and SCADA systems.

Method and Apparatus For Monitoring and Troubleshooting Of HVAC Equipment

A method including: determining whether a cooling system is operating in a cooling mode, such that the cooling system is not operating in a reheat mode, a humidification mode or a dehumidification mode; determining whether the cooling system is operating in a compressor mode, such that the cooling system is not operating in a pump refrigerant economization mode; determining whether the cooling system is at steady-state; and if the cooling system is operating in the cooling mode and the compressor mode and is at steady-state, evaluating one or more rules to determine if a degradation symptom exists for the cooling system. The method further includes: subsequent to the evaluation, generating a degradation evaluation value to indicate whether the one or more rules are satisfied; and based on the degradation evaluation value, generating an alarm signal or performing a countermeasure.

Systems and methods for detecting degradation of a component in an air conditioning system

Provided is a monitoring device 109 for an air conditioner that air conditions a target space and constitutes a refrigerant circuit that circulates a refrigerant and has at least a compressor 1, a heat source-side heat exchanger 3, a diaphragm device, and a use-side heat exchanger. The monitoring device 109 is provided with: a recording device 105 that records, for a plurality of air conditioners 101, operation data indicating the operation states of the air conditioners 101; and a monitoring processing device 104 that, with the specifications of the refrigerants and the apparatuses comprising the air conditioners 101 as conditions, extracts, from the recording device 105, operation data having the same range of conditions as a first air conditioner 101a, which is a target of monitoring, and detects abnormalities by comparing the extracted operation data with the operation data of the first air conditioner 101a.

Monitoring device and method for air conditioner

In a cooling system having a plurality of identical cooling circuits, fault detection is determined by a controller if monitored operating parameters of the cooling circuits differ from each other by an appreciable amount. In an aspect, the controller uses a comparison of the operating parameters of a cooling circuit to a snapshot of the operating parameters of that cooling circuit taken after the cooling circuit is determined to be operating properly after start-up. In an aspect, the controller uses known operating parameters of a cooling circuit and a system model of the cooling circuit to calculate remaining operating parameters of the cooling circuit (system model operating parameters) and uses a comparison of the system model operating parameters to the monitored operating parameters.

Fault detection in a cooling system with a plurality of identical cooling circuits

In an aspect, a cooling system has a cooling circuit that includes an evaporator, a condenser, a compressor, a sub-cooler and an expansion device configured in a direct expansion cooling circuit with the sub-cooler coupled in series between an outlet of the condenser and an inlet of the expansion device. The condenser has a micro-channel cooling coil and the sub-cooler has a fin-and-tube cooling coil. In an aspect, the fin-and-tube cooling coil of the sub-cooler has a total hydraulic volume equivalent to the total hydraulic volume of the micro-channel cooling coil of the condenser but the fin-and-tube cooling coil of the sub-cooler has a face area more than two times smaller than a face area of the micro-channel cooling coil of the condenser.

Cooling system having a condenser with a micro-channel cooling coil and sub-cooler having a fin-and-tube heat cooling coil

The present invention provides a system and method of controlling a level of superheat during a pump mode of operation of a refrigeration system, wherein the refrigeration system can operate in eitherthe pump mode or a compressor mode, and has an electronically controlled expansion valve (EEV). A controller obtains a stored, predetermined pump differential pressure range able to be produced by apump of the system. The controller also obtains a stored, predetermined superheat range, and detects a superheat level. When the detected superheat level is outside of the superheat temperature range,the controller commands adjusting at least one of the EEV and a speed of the pump based on whether the detected superheat level is above or below the superheat range, and whether a current pump differential pressure is above or below the predetermined pump differential pressure range.

Method of controlling level of superheat during pump mode of operation, and refrigeration system

The present disclosure relates to a method for controlling a level of superheat during a pump mode of operation of a refrigeration system, wherein the refrigeration system can operate in either the pump mode or a compressor mode, and has an electronically controlled expansion valve (EEV). A controller obtains a stored, predetermined pump differential pressure range able to be produced by a pump of the system. The controller also obtains a stored, predetermined superheat range, and detects a superheat level. When the detected superheat level is outside of the superheat temperature range, the controller commands adjusting at least one of the EEV and a speed of the pump based on whether the detected superheat level is above or below the superheat range, and whether a current pump differential pressure is above or below the predetermined pump differential pressure range.

System and method to maintain evaporator superheat during pumped refrigerant economizer operation

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Papers

Fault detection in a cooling system with a plurality of identical cooling circuits

Cooling system having a condenser with a micro-channel cooling coil and sub-cooler having a fin-and-tube heat cooling coil

Method of controlling level of superheat during pump mode of operation, and refrigeration system

System and method to maintain evaporator superheat during pumped refrigerant economizer operation