A system or method can be used to monitor operations of a heat exchanger, such as a condenser of an air conditioning system, that includes a header plate. A temperature sensor can be secured to the header plate to measure a temperature of the header plate as a proxy for a temperature or a pressure of a working fluid of the heat exchanger.

A refrigeration plant with a cooling circuit, comprising at least one peripheral unit having a refrigeration machine for refrigerating a storage compartment; the refrigeration machine having a heat exchanger connected to the cooling circuit for dissipating heat to a secondary fluid flowing therein; a cooling apparatus connected to the cooling circuit for cooling the secondary fluid; a control device connected to the cooling apparatus and configured to operate the cooling apparatus so as to maintain at least an operating temperature of the secondary fluid within at least a corresponding reference range or to equalize it to at least a corresponding target value.

The invention relates to a refrigeration system comprising at least one display cabinet equipped with a refrigeration apparatus defining at least one refrigeration circuit and comprising: at least one compressor, a condenser, an expansion valve, an evaporator, a refrigerant circulating therethrough, a plurality of sensors measuring pressure and temperature of the refrigerant at various positions in the refrigeration circuit, and a control module configured to control operation at least of the compressor based on output from at least one of the sensors, wherein the control module is further configured to detect any faulty or non-optimal functioning of at least one of the compressor, the expansion valve and a sensor based on output from at least one of the sensors.

The present disclosure relates to a multi-circuit heating, ventilation, and air conditioning (“HVAC”) system for use with a first refrigerant in a first refrigerant circuit and a second refrigerant in a second refrigerant circuit. The second refrigerant circuit is fluidically isolated from the first refrigerant circuit. Additionally, a first sensor is operable to detect a leak of at least one of the first and second refrigerants or is operable to measure temperature or pressure from the first refrigerant circuit or the second refrigerant. The multi-circuit HVAC system further including a controller programmed to receive the measurement from the sensor to identify the circuit or circuits that are leaking, to turn off operation of the leaking circuit or circuits, and if only one circuit is leaking, operate only the other of the circuits.

A heat pump apparatus includes: a refrigerant circuit which circulates refrigerant; a heat medium circuit which makes a heat medium flow; a heat exchanger which cause heat exchange to be performed between the refrigerant and the heat medium; and an indoor unit which houses at least the heat exchanger. The heat exchanger has a double-wall structure. The indoor unit includes a container which houses the heat exchanger. In the container, a first opening port is formed to communicate with an outdoor space without communicating with an indoor space.

A heating mode control method of an air conditioner, comprises: obtaining an indoor temperature and calculating the difference between the indoor temperature and an indoor target temperature to obtain an indoor temperature difference as air conditioner running at heating mode; performing a coil temperature control process as the indoor temperature difference in a set indoor temperature difference range, wherein the coil temperature control process including: obtaining an indoor coil temperature and controlling the frequency of the compressor according to the indoor coil temperature and a coil target temperature. The application of the method can achieve the purpose of improving the heating effect by increasing the outlet air temperature, thus improving the heating performance of an air-conditioner.

A diaphragm pressure regulator includes: a body defining a process surface and including: an exhaust port having a discharge opening, and at least one vent void interconnecting the process surface and the exhaust port; and an inlet port, and at least one process void communicating with the process surface and the inlet port; a reference housing including a cavity defining a reference surface and a reference port in fluid communication with the cavity; and a diaphragm disposed between the body and the reference housing, the diaphragm movable between a first position engaged with the vent voids, and a second position wherein the membrane is not engaged with at least one of the vent voids, wherein a dome is defined between the cavity and the reference side of the diaphragm; and wherein the reference housing includes a sump configured to segregate liquid from the reference side of the diaphragm.

The technique in PTL 1 is incapable of grasping a decrease in the amount of a refrigerant from an initial amount of the refrigerant, and the determination of the amount of the refrigerant is insufficient for the purpose other than protection of a compressor. A refrigeration cycle apparatus includes an air temperature sensor, and a condensation temperature sensor. The air temperature sensor detects an air temperature, which is a temperature of air that flows into a condenser. The condensation temperature sensor detects a condensation temperature of the refrigerant that flows through the condenser. The apparatus is configured to acquire a temperature difference between the air temperature and the condensation temperature. The apparatus is further configured to determine an amount of the refrigerant included in the refrigerant circuit by comparing a first temperature difference and a second temperature difference with each other. The first temperature difference is a temperature difference at a first timing. The second temperature difference is a temperature difference at a second timing.

A monitoring method of a cooling system and a monitoring device thereof are provided. The monitoring method includes the steps: establishing an abnormality determination model according to predetermined abnormal data and predetermined abnormal types using deep learning by a monitoring module; generating groups of temperature data respectively by a plurality of temperature sensors; and determining one or more abnormal types and an abnormal prediction of the cooling system according to the groups of temperature data and the plurality of temperature sensors using the abnormality determination model by the monitoring module.

An HVAC system includes a compressor, condenser, and evaporator. A sensor measures a value associated with the refrigerant in the condenser or the evaporator, and a controller is communicatively coupled to the compressor and the sensor. The controller determines, based on an operational history the compressor, that pre-requisite criteria are satisfied for entering a sensor validation mode. After determining the pre-requisite criteria are satisfied, an initial sensor measurement value is determined. Following determining the initial sensor measurement value, the compressor is operated according to a sensor-validation mode. Following operating the compressor according to the sensor-validation mode for at least a minimum time, a current sensor measurement value is determined. The controller determines whether validation criteria are satisfied for the current sensor value. In response to determining that the validation criteria are satisfied, the controller determines that the sensor is validated.