Abstract:
Methods and systems for controlling the collection and storage of data are described. In general, the system includes a human-machine interface (HMI), and the HMI includes an interface that is configured to receive and connect with an external device. Generally, the methods and systems involve the use of an external storage device that can store, for example, collected data and/or analyzed data.
Abstract:
Operation of a transcritical refrigerant vapor compression system for supplying temperature conditioned air to a temperature controlled space is controlled when staging up or staging down to avoid undesirable overshoot and undershoot of the narrow temperature band bounding the control temperature set point for the temperature within the temperature controlled space.
Abstract:
The invention is directed to a configuration for compressing a gas comprising (i) a reciprocating compressor (8), wherein the compressor comprises a mechanical drive to transfer energy from a variable rotational power source (1) to the compressor and a control valve (34, 35) and an adjustable swash plate (30), wherein adjusting the control valve results in adjusting the swash plate; (ii) a speed sensor (7) to measure the rotational speed of the power source; (iii) a first control means which control means is capable of adjusting the control valve as a function of the rotational speed measured by the speed sensor.
Abstract:
An electric motor configured to drive an air moving device included within a heating, ventilation, and air conditioning (HVAC) system is described. The air moving device is configured to draw air through a condensing coil of the HVAC system from a first side of the condensing coil to a second side of the condensing coil. The motor includes a temperature sensor configured to measure an exhaust air temperature at the second side of the condensing coil and to generate a temperature signal that includes measured temperature information. The motor also includes a controller communicatively coupled to the temperature sensor and configured to receive the temperature signal and to control operation of the motor based at least partially on the temperature signal.
Abstract:
Embodiments of apparatus, transport refrigeration units, and methods for operating the same can control cooling capacity for a refrigerant vapor compression system. Embodiments can provide use discharge pressure control for modulating cooling capacity for a refrigerant vapor compression system. In one embodiment, discharge pressure control can reduce the cooling capacity without increasing the compressor pressure ratio or discharge temperature. In one embodiment, discharge pressure control can reduce the cooling capacity independently of system superheat. In one embodiment, discharge pressure control can control a compressor discharge temperature; for example, to remain below a threshold temperature.
Abstract:
In a refrigeration system having a compressor, a heat rejection heat exchanger, a heat absorption heat exchanger, and a controller for controlling the same, embodiments of a system, apparatus and methods for the same can control at least one refrigeration system component such as an expansion valve responsive to dynamic system conditions.