A multi-split air-conditioning system, and a method for calculating a heat exchange capacity thereof. The method includes: acquiring a total heat exchange capacity of a multi-split air-conditioning system; acquiring a pressure difference between two pressure measurement points on each air pipe; acquiring the distance between the two pressure measurement points on each air pipe; acquiring the pipe diameter of each air pipe; acquiring the friction factor of each air pipe; acquiring the density of a heat exchange medium in each air pipe; and according to the total heat exchange capacity of the multi-split air-conditioning system, the pressure difference and distance between the two pressure measurement points on each air pipe, the pipe diameter and friction factor of each air pipe, and the density of the heat exchange medium in each air pipe, calculating a heat exchange capacity of each indoor unit.

A heating, ventilation, and air conditioning (HVAC) system including a refrigerant line configured to carry refrigerant. A sound wave generator is in cooperation with the refrigerant line to introduce sound waves into the refrigerant line. The sound waves are configured to break up bubbles in the refrigerant within the refrigerant line to suppress noise resulting from the bubbles flowing through the HVAC system

A refrigeration cycle apparatus capable of performing pump down operation while suppressing degradation in performance is provided. The refrigeration cycle apparatus includes an outdoor heat exchanger, a compressor including an inlet side and an outlet side, at least one indoor heat exchanger, a four-way valve, a check valve including an inlet side and an outlet side, a pipe serving as a first flow path connecting the outlet side of the check valve to the inlet side of the compressor, a first on-off valve, and a refrigerant leak detection device. The refrigeration cycle apparatus is configured such that, when a refrigerant leak is detected by the refrigerant leak detection device, pump down operation is performed as refrigerant transfer operation of transferring the refrigerant from the indoor heat exchanger to the outdoor heat exchanger.

A recycle information management system includes a communication device and a management device. The communication device transmits recycle information acquired from a recycle system via a network. The recycle system includes at least a recycling device that removes at least oil from the collected refrigerant to recycle the refrigerant. The management device includes a storage unit that stores the recycle information in association with a recycle system ID usable to identify the recycle system.

Systems and methods for providing an improved strategy for controlling a variable speed water pump in a vehicle. In some embodiments, more than one water pump speed function is calculated based on values obtained from vehicle sensors, and a controller chooses among the water pump speed function results to set a water pump speed. In some embodiments, the water pump speed is increased when driveline torque is greater than a threshold amount for an amount of time that varies based on the driveline torque. In some embodiments, ambient temperature is considered while determining whether the water pump should provide full coolant flow to an auxiliary coolant loop of a trailer.

Device for determining the mixing ratio of a mixture of at least two different fluids, the device comprising: a pipe section with a measuring region; wherein the mixture flows through the measuring region; a radar sensor system with a radar sensor chip arranged on an outer wall of the pipe section. The radar sensor system is configured to: irradiate frequency-modulated millimeter-radar waves (f.sub.S) in a specified frequency range (f) into the measuring region; receive millimeter-radar waves (f.sub.R) backscattered by the mixture; determine a frequency-dependent reflection coefficient (.sub.f) for the specified frequency range (f) using the backscattered millimeter-radar waves (f.sub.R); and calculate or allocate the mixing ratio from the determined frequency-dependent reflection coefficient (.sub.f).

A heating, ventilation, and/or air conditioning (HVAC) unit includes a first sensor disposed adjacent to an inlet of an evaporator configured to receive an airflow. The HVAC unit includes a second sensor disposed adjacent to an outlet of a reheat coil positioned downstream of the evaporator and configured to expel the airflow. The HVAC unit also includes a controller configured to regulate operation of a modulating reheat valve to adjust flow of a working fluid in thermal communication with the airflow to control a difference between a measurement of the first sensor and a measurement of the second sensor.

The present invention relates to a fluid line system (10) for guiding fluid, in particular for a motor vehicle. The fluid line system (10) comprises a sensor device (20) for capturing sensor parameters and a housing (30), which has two or more housing parts (40, 60). Each housing part (40, 60) has a mounting surface area (50, 70) for arranging a further housing part (40, 60). The housing (30) further has a groove arrangement (80), which comprises at least one groove recess (90), which is arranged on a mounting surface area (50, 70), wherein a groove recess (90) has a groove opening (95), which opens out to the respective mounting surface area (50, 70). In any case, the groove opening (95) is closed by in a fluid-tight manner means of the mounting surface area (50, 70) of at least one further housing part (40, 60). It is attained thereby that a fluid duct (99), through which fluid can flow and through which fluid can be applied to the sensor device (20), is limited between the respective groove recess (90) and the respective mounting surface area (50, 70).

A refrigeration cycle apparatus includes a main refrigerant circuit, a changer, and a controller. The main refrigerant circuit uses a non-azeotropic refrigerant mixture containing a first refrigerant and a second refrigerant. The changer changes a composition ratio between the first refrigerant and the second refrigerant in a refrigerant flowing through the main refrigerant circuit. The controller controls an operation of the changer. The controller executes a first mode and a second mode. The first mode is a mode in which the operation of the changing unit is controlled to cause substantially the second refrigerant alone to flow through the main refrigerant circuit. The second mode is a mode in which the operation of the changing unit is controlled to cause a refrigerant mixture of the first refrigerant and the second refrigerant to flow through the main refrigerant circuit.

A refrigeration apparatus includes a container such as an evaporator for holding refrigerant, and a compressor for compressing refrigerant vapor. The compressed vapor is returned to the container, and stored as liquid. The liquid refrigerant is withdrawn from the container and then returned to the container via a first path through a heat exchanger for cooling a space, or a second path that does not pass through the heat exchanger. Upon returning to the container, the liquid refrigerant is at least partly evaporated due to the reduced pressure in the container caused by the operation of the compressor, and the container is cooled by the latent heat of evaporation. Thus, the container can act as a cold storage unit. The cold storage effect is increased when the refrigerant is returned to the container via the second path.