Abstract:
Present invention is to provide a heat pump type airconditioner wherein during warming, a refrigerant is successively circulated through a compressor--an indoor heat exchanger--an outdoor heater equipped with a refrigerant heating mechanism--the compressor and wherein a bypass circuit it disposed which includes a solenoid valve for the communication between the delivery side and suction side of the compressor; characterized in that a refrigerant temperature at an outlet of the refrigerant heating mechanism is sensed, that the solenoid valve is opened to bypass the refrigerant at the starting of the operation, that is, at the starting of the compressor, while the solenoid valve is closed when the refrigerant temperature has reached a predetermined temperature owing to heating and that the refrigerant heating mechanism is turned OFF after the refrigerant temperature has risen up to a predetermined temperature.
Abstract:
A heat pump system includes a refrigerant circuit that has a compressor, a first heat exchanger, a second heat exchanger, a reheat heat exchanger, a modulating valve, and a reversing valve. The reversing valve is configured to transition between a first configuration to direct refrigerant from the compressor toward the modulating valve and a second configuration to direct the refrigerant from the compressor toward the first heat exchanger. The heat pump system also includes control circuitry configured to concurrently maintain the reversing valve in the first configuration and adjust a position of the modulating valve to direct a first portion of the refrigerant from the modulating valve to the second heat exchanger and a second portion of the refrigerant from the modulating valve to the reheat heat exchanger based on an operating mode of the heat pump system.
Abstract:
A multi-type air conditioner includes an outdoor unit, one or more indoor units communicating with the outdoor unit, and a liquid-stay preventing device heating and evaporating a liquefied refrigerant so as to prevent the liquefied refrigerant circulating between the indoor unit and the outdoor unit from being accumulated at a low pressure side including the indoor unit. Accordingly, a liquefied refrigerant is not accumulated in an indoor unit and a connection pipe, which are a low pressure side where the pressure is relatively low, but smoothly passes therethrough regardless of a height difference between the indoor unit and the outdoor unit. Therefore, the efficiency of the multi-type air conditioner is improved. Also, because the refrigerant deficiency is prevented from occurring at a high pressure side, the reliability of the cooling operation is improved, and the liquefied refrigerant accumulated at the low pressure side is introduced into a compressor of the outdoor unit, thereby preventing damage to the compressor.
Abstract:
A heat pump may include a compressor configured to compress a refrigerant, a first temperature sensor configured to detect an outdoor temperature, a second temperature sensor provided in heating pipes connected to a heating device, and a controller. Based on a first sensing value of the first temperature sensor, the controller may be configured to control a compressor, control power to a boiler, and/or calculate an expected efficiency of the heat pump. Based on the expected efficiency and/or a second sensing value of a second temperature sensor, the controller may be configured to control power to the boiler.
Abstract:
An air-conditioning apparatus forms a refrigerating cycle with a refrigerant heater and a compressor having two cylinders. The apparatus simultaneously carries out a refrigerant heating operation and a heat pump operation when a required heating capacity is high, and when the required heating capacity is low, only the heat pump operation. This operation technique helps reduce the size of the apparatus and expand a variable width of heating capacity. The apparatus also has a defrosting unit for defrosting an outdoor heat exchanger during the heat pump operation.
Abstract:
An airconditioner wherein cooling is performed by forming a refrigerant circulation passage which condenses a refrigerant delivered from a compressor by means of an outdoor heat exchanger and which evaporates it by means of an indoor heat exchanger, while warming is performed while condensing the refrigerant by means of the indoor heat exchanger by furnishing the refrigerant circulation passage with a heating heat exchanger which heats the refrigerant through a heat medium higher in temperature than the open air and which is located in parallel with the outdoor heat exchanger and between the indoor heat exchanger and the suction side of the compressor; characterized by comprising a circuit which bypasses the higher pressure side and lower pressure side of the compressor through a solenoid valve, and a controller which normally closes the bypass circuit during the cooling and normally opens the bypass circuit during the warming and which opens the bypass circuit for a predetermined period of time at the starting of the cooling.
Abstract:
A heat pump type airconditioner wherein a heat exchanger serving as a vaporizer during a warming operation mode is heated by a heating means such as combustion gas from a burner, so as to heat the refrigerant before flowing through the heat exchanger before it is compressed, in which a bypass bypasses part of the refrigerant delivered from the compressor back to the suction side of the compressor during the refrigerant heating operation, and a temperature sensor is disposed in the refrigerant outlet pipe line from the heat exchanger serving as the vaporizer in the refrigerant heating operation and controlling the turning "on" and "off" of the combustion in order to keep the degree of superheat of the refrigerant lower than the deterioration temperature of the refrigerant as well as the refrigerating machine oil and a temperature controller adjacent the indoor heat exchanger and which controls the air flow rate over the indoor heat exchanger in dependence on the temperature of the air stream.
Abstract:
A heat pump cycle includes a first usage side heat exchanger that heats a target fluid via heat exchange with refrigerant discharged from a compressor. The refrigerant flowing out of the first usage side heat exchanger is reduced in pressure by a first pressure reducing unit, and then separated into gas and liquid by a gas-liquid separation unit. The separated gas-phase refrigerant flows toward an intermediate-pressure port of the compressor. The separated liquid-phase refrigerant is reduced in pressure by a second pressure reducing unit. An additional heat exchanger performs heat exchange between the refrigerant flowing from the second pressure reducing unit and a heat medium, and allows the refrigerant to flow toward an intake port of the compressor. A second usage side heat exchanger performs heat exchange between the separated liquid-phase refrigerant and a counterpart fluid, and allows the refrigerant to flow toward the second pressure reducing unit.
Abstract:
A refrigeration apparatus includes a compressor, a heat source-side heat exchanger, a receiver, a utilization-side heat exchange, a receiver degassing pipe interconnecting an upper portion of the receiver and a suction side of the compressor, and a receiver liquid level detection pipe connected to the receiver. The receiver liquid level detection pipe detects whether or not liquid level in the receiver has reached a predetermined position on a lower side of a position where the receiver degassing pipe is connected. The receiver liquid level detection pipe merges with the receiver degassing pipe via a capillary tube. The receiver degassing pipe has a refrigerant heater to heat refrigerant flowing through the receiver degassing pipe. Whether or not the liquid level in the receiver has reached the predetermined position is detected using a temperature of refrigerant flowing though the receiver degassing pipe.
Abstract:
A refrigeration apparatus includes a compressor, a heat source-side heat exchanger, a receiver, a utilization-side heat exchange, a receiver degassing pipe interconnecting an upper portion of the receiver and a suction side of the compressor, and a receiver liquid level detection pipe connected to the receiver. The receiver liquid level detection pipe detects whether or not liquid level in the receiver has reached a predetermined position on a lower side of a position where the receiver degassing pipe is connected. The receiver liquid level detection pipe merges with the receiver degassing pipe via a capillary tube. The receiver degassing pipe has a refrigerant heater to heat refrigerant flowing through the receiver degassing pipe. Whether or not the liquid level in the receiver has reached the predetermined position is detected using a temperature of refrigerant flowing though the receiver degassing pipe.