Abstract:
A heat pump hot-water supply system includes a heat pump hot-water supply device, an electricity storage device, and a control device. The control device determines an operating time zone of the heat pump hot-water supply device based on power conversion efficiency of the electricity storage device, coefficients of performance of the heat pump hot-water supply device of a current day and a next day, and an electricity rate structure of a commercial power system.
Abstract:
A refrigerating machine includes a compressor for compressing a refrigerant, a radiator for radiating heat from the refrigerant discharged from the compressor, an expander for expanding the refrigerant discharged from the radiator, and an evaporator for evaporating the refrigerant discharged from the expander, all connected in series. The refrigerating machine also includes a refrigerant flow regulator for regulating the amount of refrigerant flowing into the expander and a controller for controlling the compressor and the refrigerant flow regulator. When the compressor is stopped, the controller controls the refrigerant flow regulator to reduce the amount of refrigerant flowing into the expander.
Abstract:
A refrigeration cycle apparatus (100) includes: a first compressor (101); a second compressor (102) connected in parallel with the first compressor (101) in a refrigerant circuit (200); a radiator (103) for cooling a refrigerant compressed by the first and second compressors; an expander (104) coupled to a rotation shaft of the first compressor (101); an evaporator (105) for evaporating the refrigerant expanded by the expander (104); and a controller (115). The controller (115) includes an efficiency enhancing means for performing a first process including a step of changing a rotation speed of the first compressor (101), as a process for increasing a coefficient of performance (COP) of the refrigeration cycle apparatus (100), when a temperature of a heat carrier flowing into the radiator (103) is in a predetermined temperature range, and for performing a second process including a step of changing a rotation speed of the second compressor (102), as a process for increasing the coefficient of performance, when the temperature of the heat carrier flowing into the radiator (103) is not in the predetermined temperature range.
Abstract:
The present invention provides a heat pump including: a compressor; a radiator; a first throttling device having a variable opening; an expander; a second throttling device having a variable opening; an evaporator; piping that connects the compressor, the radiator, the first throttling device, the expander, the second throttling device, and the evaporator so that refrigerant circulates thorough the elements in that order; and a control device for controlling the opening of the first throttling device and the opening of the second throttling device. This heat pump is capable of independently controlling the pressure of the refrigerant flowing into the expander (intermediate pressure) and pressure in a high-pressure side of a refrigeration cycle, and also is capable of size reduction, or in some cases elimination, of a receiver for the refrigerant.
Abstract:
An information terminal device includes an acquisition unit acquiring language identification information concerning a language used on a display screen, a storage unit storing address information of a server, a language identification information synthesizer synthesizing the language identification information into the address information, and a transmitter transmitting the address information to the server.
Abstract:
It has been difficult to operate a drying apparatus in a stable and high-efficiency state where a superheat value is changed in a drying process. A drying apparatus includes: a first temperature sensor 38 which detects the temperature of a refrigerant between the outlet of an evaporator 34 and the inlet of a compressor 31; and control means 14 for controlling a superheat value by changing flow resistance of an expansion valve 33 based on a detected value of the first temperature sensor 38. The control means 14 controls the superheat value in the drying process to become a target value.
Abstract:
The present invention provides a heat pump including: a compressor; a radiator; a first throttling device having a variable opening; an expander; a second throttling device having a variable opening; an evaporator; piping that connects the compressor, the radiator, the first throttling device, the expander, the second throttling device, and the evaporator so that refrigerant circulates thorough the elements in that order; and a control device for controlling the opening of the first throttling device and the opening of the second throttling device. This heat pump is capable of independently controlling the pressure of the refrigerant flowing into the expander (intermediate pressure) and pressure in a high-pressure side of a refrigeration cycle, and also is capable of size reduction, or in some cases elimination, of a receiver for the refrigerant.
Abstract:
A refrigeration cycle apparatus 100 includes a first compressor 101, a second compressor 102 provided in parallel with the first compressor 101, a radiator 103 for cooling a refrigerant compressed by the compressors 101 and 102, an expander 104 for recovering power while expanding the refrigerant cooled by the radiator 103, an evaporator 105 for evaporating the refrigerant expanded by the expander 104, a rotation shaft 123 connecting the first compressor 101 to the expander 104 so that the first compressor 101 uses the power recovered by the expander 104, a controller 112 for executing a control including a step of increasing a flow rate of the refrigerant gradually during a defrosting operation in which frost formed on the evaporator 105 is melted by allowing the refrigerant having a high temperature to flow through the evaporator 105.
Abstract:
A grid-connected power supply system includes a power generation apparatus configured to generate power by using natural energy and connected in parallel to a commercial power grid; a electricity storage device; and a control device configured. The control device predicts an amount of power to be generated on a subsequent day by the power generation apparatus and a power demand of the loads and charges the electricity storage device with power in a time zone in which an electricity rate of the commercial power grid is relatively low if a predicted value of the amount of power to be generated is lower than a predicted value of the power demand, or does not charge the electricity storage device with power during the time zone if the predicted value of the amount of power to be generated is not lower than the predicted value of the power demand.
Abstract:
An information terminal device and method for upgrading a program simply and flexibly and an upgraded program is described. In many cases, a program running on a computer has additional functions prepared separately so that they can be added to that program as necessary. To use the additional functions, a user may purchase a new version of that program and install it on their computer by selecting icons which link to the new version of the program.