Korea Institute of Energy Research

Ho Sang Ra

Gil Bong Lee

Young Jin Baik

Jun Hyun Cho

Young Soo Lee

Hyung Ki Shin

Beom Joon Lee

Min Soo Kim

Ki Chang Chang

Seong Ryong Park

Jong Jae Cho

Chul Woo Roh

Chui Woo Roh

Wook Hyun Lee

Bong Su Choi

Ki Chang Jang

Huyng Kee Yoon

Jong Ryul Kim

Yong Jin Baik

Eun Seok Wang

Jun Tack Park

In the present invention, a recuperator is used in a refrigerant cycle to make a heat exchange between a refrigerant generated in a condenser and a refrigerant before flowing into a compressor, thereby supercooling the refrigerant to minimize the quality of the refrigerant introduced into an evaporator, elevating temperatures at an inlet and an outlet of the compressor, and increasing condensed heat of the condenser. In the present invention, a recuperator is used to increase condensed heat of the condenser, leading to increasing the heat which circulation water circulating in a steam producing cycle receives from the condenser, whereby steam production efficiency can be improved.

Heat pump system for producing steam by using recuperator

The present invention provides a partial admission operation turbine apparatus comprising: a rotor portion rotatably coupled to a rotary shaft of a turbine and including a plurality of rotor blades; a nozzle portion fixedly coupled to the rotary shaft in front of the rotor portion and guiding and supplying a working fluid to the rotor blades through a plurality of nozzle blades; and an inlet disk coupled to the rotary shaft in front of the nozzle portion in a plate shape and having a plurality of admission holes formed therein so as to supply the working fluid to the nozzle portion to partially admit the working fluid into the nozzle portion, wherein each of the admission holes is formed to have a different passage cross-sectional areas, so that the opening and closing of the admission holes are controlled according to operating flow rate conditions to control a partial admission ratio of the working fluid supplied to the nozzle portion. Due to the aforementioned feature, since continuous partial admission can be operated for a supercritical power generation system, it is possible to resolve the difficulties in designing and manufacturing turbines. Also, since the partial admission ratio can be adjusted according to operating conditions, it is possible to improve the performance of a turbine that is operated by continuous partial admission. Furthermore, even if the operating flow rate conditions change in the same cycle, it is possible to operate the same turbine with high efficiency.

Partial admission operation turbine apparatus for improving efficiency of continuous partial admission operation and method for operating turbine apparatus using same

According to the present invention, part of carbon dioxide heated by a heater is supplied to a dry gas seal portion of a compressor so that a device for pressurizing and heating a seal gas is not additionally required, configuration can be simplified and cost can be reduced. In addition, a seal gas flow path includes a low-temperature seal gas flow path and a high-temperature seal gas flow path so that, in an initial driving mode, carbon dioxide heated by a high-temperature portion of the heater is used as a seal gas and in a turbine-driving mode, carbon dioxide heated by a low-temperature portion of the heater is used as a seal gas and thus a more efficient operation can be performed.

Supercritical carbon dioxide power generation system including dry gas seal and method of operating the same

A single-stage compressor including one compressing unit, includes: a housing having a compressing chamber formed therein and including a suction port, which is located in one side of the compressing chamber and into which a working fluid enters, and an injection port, which is located on the compressing chamber to be spaced apart from the suction port by a predetermined distance and into which an intermediate-pressure working fluid is injected; and an intermediate-pressure valve installed on an intermediate-pressure fluid flow path on which the intermediate-pressure working fluid moves and configured to control supply of the intermediate-pressure working fluid so that the intermediate-pressure working fluid is supplied to the injection port in response to an intermediate pressure of the compressing chamber. In the injection-type compressor having a single chamber, a working fluid is injected at an intermediate pressure (not in the proximity of a suction pressure) so that efficiency and capability of the injection-type compressor having a single chamber can be improved. The injection-type compressor having a single chamber has a simple structure and is easily manufactured so that a pressure of an injection port and a corresponding intermediate pressure can be selectively set in various ways.

Single-stage compressor and energy system using the same

In a steam turbine power generation system according to the present invention, a regenerator and an ejector are selectively operated according to outdoor air temperature so that the effects of the outdoor air temperature can be minimized and thus an increase in back pressure of a turbine is prevented and thus the operating efficiency of the steam turbine power generation system can be guaranteed. In addition, when the outdoor air temperature is lower than a set temperature, only a steam condenser and an air cooling condenser are used, and when the outdoor air temperature is equal to or higher than the set temperature, the regenerator and the ejector are operated so that the condensation efficiency of the air cooling condenser is improved and thus the cooling efficiency of the steam turbine power generation system can be maximized.

Steam turbine power generation system

The present invention drives an ejector refrigeration unit using waste heat, such as a combustion gas generated from the outside, etc., and cools a working fluid sucked into a compressor in a power generator using the working fluid that circulates in the ejector refrigeration unit, thereby reducing a compression work of the compressor so that efficiency of a system can be improved.

Power generation system using ejector refrigeration cycle

A supercritical carbon dioxide power generation system is provided. The supercritical carbon dioxide power generation system may include a regenerator, a turbine, a heat recoverer, a condenser, a compressor an expansion valve, a flash tank, a heat exchanger, and an ejector, and may utilize waste heat of the supercritical carbon dioxide power generation system.

Supercritical carbon dioxide power generation system

A heating medium supplied to an evaporator is used to heat lubricant oil in a screw compressor before the screw compressor starts up, and no additional heater for heating the lubricant oil in the screw compressor is required. When the screw compressor operates, the heating medium discharged from the evaporator after the evaporator is heated by the heating medium, is used to cool the lubricant oil. The lubricant oil heated by a lubricant oil heat exchanger is directly injected into a motor and a screw rotor so that introduction of a liquid refrigerant into a compressive chamber is reduced when the screw compressor starts up later. The lubricant oil introduced into the motor is discharged toward a lubricant oil storage portion before the screw compressor starts up so that the liquid refrigerant is prevented in advance from being introduced into the screw rotor when the screw compressor starts up.

Energy system

A dehumidification system including: an exhaust path for exhausting indoor air to the outdoor space; an inlet path for entering outdoor air to the indoor space from the outdoor space; an indoor air bypass path bypassing a part of indoor air to be exhausted to the exhaust path to the inlet path by connecting the exhaust path and the inlet path; an outdoor air bypass path bypassing a part of outdoor air to be flowed to the inlet path to the exhaust path by connecting the inlet path and the exhaust path; and a porous separation membrane filter installed between the indoor air bypass path and the outdoor air bypass path and passing water molecules included in indoor air passing through the indoor air bypass path through the outdoor air bypass path.

Dehumidification system

In a heat pump system according to the present invention, at least part of a plurality of outdoor heat-exchanging flow paths that pass through an outdoor heat exchanger is alternately selected as a flow path for defrosting and is used, and the other flow path is used as a flow path for evaporation so that defrosting and a heating operation can be simultaneously performed. In addition, the refrigerant in which a defrosting action is performed, while passing through the outdoor heat exchanger, is throttled and then is used for an evaporation action so that the structure of the heat pump system is simple and both heating and defrosting can be performed.

Heat pump system

A heat pump system includes a liquid receiver valve that adjusts the amount of a refrigerant stored in a liquid receiver so that a circulation amount of the refrigerant that circulates the heat pump system can be adjusted according to a driving speed of a compressor and performance of the compressor and the heat pump system can be further improved. Also, since a plurality of liquid receiver refrigerant outlets can be selectively opened using a pressure difference between an inlet and an outlet of the compressor, active control can be performed.

Heat pump system capable of adjusting amount of refrigerant stored in liquid receiver

There is provided a Rankine cycle system which generates electricity by using heat as an energy source, in which a conventional pump for carrying a working fluid is not used, thereby reducing the cost of manufacturing the Rankine cycle system, saving the electric power consumed to operate the pump and therefore obtaining a greater output of power, and in which a control system is used to automatically operate the Rankine cycle system, thereby enabling to stably operate the Rankine cycle system even though a heat source is intermittently supplied.

Rankine cycle system and method of controlling the same

Disclosed herein is a flash tank of a two-stage compression heat pump system that can perform cooling and heating with a separate type intercooler and a high-stage compressor protecting device. The system comprises a fluid-level detecting sensor for detecting the fluid-level of the refrigerant, an alarm sensor for notifying the saturated state of the refrigerant filled in the flash tank, an evaporator pressure sensor for measuring and notifying the pressure of the refrigerant flowing into the evaporator, a condenser pressure sensor for measuring and notifying the pressure of the refrigerant flowing out of the condenser, a flash tank fluid-level controller for receiving signals from the above sensors and controlling intermediate pressure and the fluid-level of the flash tank, and a bypass valve controller for controlling a bypass valve that receives signals from the alarm sensor and allowing a refrigerant to directly flow from the low-stage compressor to the high-stage compressor.

Growing community of inventors

Daejeon, South Korea

Ho Sang Ra