496 results about "Intermediate heat exchanger" patented technology

An air-conditioning apparatus capable of achieving enhancement of the system COP while suppressing product cost. The air-conditioning apparatus controls the difference between the temperatures of brine at a position before and at a position after an indoor heat exchanger or at a position before and at a position after an intermediate heat exchanger to be a preset target value and to be larger at the time of a heating operation than at the time of a cooling operation.

An automobile air-conditioning system comprises a compressor, a vapor liquid separator, a first heat exchanger, a second heat exchanger, a third heat exchanger and an intermediate heat exchanger. The third heat exchanger selectively exchanges heat with an external environment, the intermediate heat exchanger is provided with a first portion and a second portion which can exchange heat, and a throttling element is arranged in a pipeline passing through the second portion of the intermediate heat exchanger. When the automobile air-conditioning system is in at least one of a refrigerating mode and a heating mode, low-temperature and low-pressure refrigerants before returning to the compressor pass through the first portion of the intermediate heat exchanger, refrigerants before throttling pass through the second portion of the intermediate heat exchanger, the low-temperature and low-pressure refrigerants before returning to the compressor exchange heat with the refrigerants before throttling in the intermediate heat exchanger, the temperature of the refrigerants before throttling is further reduced, and the temperature of the low-temperature and low-pressure refrigerants before returning to the compressor is increased, so that the operating efficiency of a heat pump system is improved.

The invention discloses an air conditioning system of an automobile. The air conditioning system comprises a refrigerant circulating system and a coolant circulating system. The refrigerant circulating system can provide a cold source for the coolant circulating system and comprises a compressor, a vapor-liquid separator, an interior condenser, an exterior heat exchanger and an interior evaporator, the vapor-liquid separator is arranged in front of an air inlet of the compressor, and the interior condenser is connected with an outlet of the compressor; a second throttling element, a bypass flow path and an intermediate heat exchanger are arranged between the interior condenser and the exterior heat exchanger, and at least two throttling elements are respectively arranged in pipelines which run from the exterior heat exchanger to the interior evaporator and the intermediate heat exchanger respectively, so that refrigerants which are condensed by the exterior heat exchanger can be throttled by the throttling elements and then can flow to the interior evaporator and the intermediate heat exchanger when the refrigerant circulating system is in a refrigerating mode. The air conditioning system has the advantages that batteries can be cooled, heat can be absorbed from low-temperature heat sources in a heat pump manner and is used for heating, accordingly, the efficiency is improved, and power consumption is reduced.

A second-refrigerant pump driving type air conditioner, including an indoor unit having an indoor heat exchanger that circulates a refrigerant containing no oil, a first circulator including a compressor that compresses and discharges a refrigerant containing oil, a first outdoor heat exchanger, a second outdoor heat exchanger, and an outdoor expander, and a second circulator including an intermediate heat exchanger connected to the indoor heat exchanger that circulates the refrigerant containing no oil and heat-exchanges the refrigerant of the first outdoor heat exchanger, a receiver, and a pump. A restriction of a length and a diameter of a connection pipe for connecting an outdoor unit and the indoor unit is decreased, and an oil shortage of the compressor is prevented.

The invention relates to a self-regulating steady-state low-temperature heat-pump water heater comprising an evaporator, a condenser, a compressor, a control device, a four-way reversion valve, a medium-pressure receiver and an intermediate heat exchanger which can form a closed main loop, wherein the four-way reversion valve is positioned on a connection access arranged between the evaporator and the condenser, the medium-pressure receiver and the intermediate heat exchanger are arranged on the other connection access arranged between the evaporator and the condenser, and a temperature sensor, an electronic expansion valve and a pressure sensor are positioned on the closed main loop. The self-regulating steady-state low-temperature heat-pump water heater is characterized in that an air-supply loop is arranged between the compressor and the intermediate heat exchanger. The self-regulating steady-state low-temperature heat-pump water heater has a main purpose of preventing hot-water preparation capacity reduction at low environmental temperature and a secondary purpose of ensuring the stable state of a refrigerant when heat load changes in the condenser and realizing higher heat-exchange performance in the condenser.

Disclosed herein is a fully passive decay heat removal system utilizing a partially immersed heat exchanger, the system comprising: a hot pool; an intermediate heat exchanger which heat-exchanges with the sodium of the hot pool; a cold pool; a support barrel extending vertically through the boundary between the hot pool and the cold pool; a sodium-sodium decay heat exchanger received in the support barrel; a sodium-air heat exchanger provided at a position higher than the sodium-sodium decay heat exchanger; an intermediate sodium loop connecting the sodium-sodium decay heat exchanger with the sodium-air heat exchanger; and a primary pump, wherein a portion of the effective heat transfer tube of the sodium-sodium decay heat exchanger is immersed in the cold pool, particularly in a normal operating state, and the surface of the lower end of a shroud for the sodium-sodium decay heat exchanger, the lower end being immersed in the sodium of the cold pool, has perforated holes.

A decay heat removal system for a liquid metal reactor, in which a decay heat exchanger (DHX) is installed concentrically with an intermediate heat-exchanger (IHX) in the same cylinder which separates the DHX and IHX from the reactor pool fluid, and serves to remove the reactor core decay heat. The cylinder surrounds the IHX and the DHX, and has an opened top portion protruded out of the level of the fluid in a hot pool, a bottom portion connected to a cold pool and a guide pipe for allowing the passage of the fluid from the hot pool into the IHX. The decay heat removal system can remove decay heat immediately after occurrence of an accident, thereby improves the safety of a nuclear plant.

A freezer-refrigerator comprising: a refrigeration compartment (2) for refrigerating and storing an object to be stored; a freezing compartment (4) for freezing and storing an object to be stored; a first compressor (11) for operating a first refrigeration cycle (10) in which a first refrigerant flows; a first heat dissipater (12) provided to a high-temperature section of the first refrigeration cycle (10); a first evaporator (14) provided to a low-temperature section of the first refrigeration cycle (10); a second compressor (21) for operating a second refrigeration cycle (20) in which a second refrigerant flows; a second evaporator (24) provided to a low-temperature section of the second refrigeration cycle (20); and an intermediate heat exchanger (31) for performing heat exchange between the low-temperature section of the first refrigeration cycle (10) and a high-temperature section of the second refrigeration cycle (20). The first evaporator (14) cools the refrigeration compartment (2), and the second evaporator (24) cools the freezing compartment (4).

In a heat pump apparatus of an indirect type including a primary circuit on a heat source side and a secondary circuit on a load side, a refrigerant in the primary circuit is prevented from leaking through the secondary circuit.

An air-conditioning apparatus includes a leakage detecting device that detects leakage of the refrigerant circulated through a refrigerant circuit, serving as the primary circuit, from an intermediate heat exchanger into a water circuit, serving as the secondary circuit, and a controller that closes valves arranged on both sides of the intermediate heat exchanger in the water circuit to prevent water containing the refrigerant from flowing beyond the valves when the leakage detecting device detects the leakage.

The refrigerating device of the invention is used to improve the refrigerating capacity of the evaporator in the refrigerating device and improve the performance. The refrigerant flowing out of the heat radiator (105) is divided into two streams, and the first refrigerant stream flows into the first flow path of the intermediate heat exchanger (107) through the auxiliary expansion valve (109), and the second refrigerant stream After flowing through the second flow path of the intermediate heat exchanger, it flows into the evaporator (108) through the main expansion valve (106) as the main throttling device, and in the intermediate heat exchanger, the first refrigerant flow and the second refrigerant flow The refrigerant flow performs heat exchange, the refrigerant flowing out of the evaporator is sucked into the compression element on the low stage side (low pressure part of the compression device), and the above-mentioned first refrigerant flow flowing out from the intermediate heat exchanger is sucked into the compression element on the high stage side ( the middle pressure part of the compression device). The pressure of the intermediate pressure portion of the compression device is determined by controlling the auxiliary expansion valve as the auxiliary throttling device based on the suction pressure and discharge pressure of the compression device.

A refrigeration apparatus includes a multi-stage compression mechanism, heat source-side and usage side heat exchangers each operable as a radiator/evaporator, a switching mechanism switchable between cooling and heating operation states, a second-stage injection tube, an intermediate heat exchanger and an intermediate heat exchanger bypass tube. The intermediate heat exchanger bypass tube ensures that refrigerant discharged from the first-stage compression element and drawn into the second-stage compression element is not cooled by the intermediate heat exchanger during a heating operation. Injection rate optimization controls a flow rate of refrigerant returned to the second-stage compression element through the second-stage injection tube so that an injection ratio is greater during the heating operation than during a cooling operation. The injection ratio is a ratio of flow rate of the refrigerant returned to the second-stage compression element through the second-stage injection tube relative to flow rate of the refrigerant discharged from the compression mechanism.

A power generating apparatus of renewable energy type includes a tower, a nacelle which is supported rotatably by a tip portion of the tower; a main shaft rotatable with a blade; a hydraulic pump which is housed in the nacelle and is driven by rotation of the main shaft; a hydraulic motor which is driven by operating oil supplied from the hydraulic pump; a generator which is coupled to the hydraulic motor; an operating-oil line which is provided between the hydraulic pump and the hydraulic motor and through which the operating oil circulates; a cooling-medium line through which cooling medium for cooling the operating oil circulates via an intermediate heat exchanger; and a main heat exchanger which cools the cooling medium by heat exchange with cool water source around a base portion of the tower, and one of the operating-oil line.

The invention provides a heat pump air conditioning system and a control method thereof and an automobile. The heat pump air conditioning system comprises a compressor, an automobile exterior heat exchanger, a first automobile interior heat exchanger and a second automobile interior heat exchanger; the first automobile interior heat exchanger can absorb heat and refrigerate the interior of the automobile; the second automobile interior heat exchanger can release heat from the interior of the automobile and can heat the interior of the automobile; the heat pump air conditioning system further comprises a cooling loop; a battery pack and intermediate heat exchanger are arranged on the cooling loop; the intermediate heat exchanger can be arranged at the two ends of the first automobile interior heat exchanger in parallel; and the intermediate heat exchanger can also be arranged on a pipeline of the second automobile interior heat exchanger in series. Compared with a mode of using PTC electric heating to heat the battery pack, the heat pump air conditioning system has the advantages that the integrated energy efficiency ratio is higher; the heat pump air conditioning system and a cooling liquid circulation system in a heat management system can realize a function of cooling the battery pack while heating a passenger compartment by controlling a solenoid valve; and the heat pump airconditioning system in the heat management system can realize a passenger compartment multi-temperature zone independent temperature control function by controlling the solenoid valve.

The invention discloses a solar and industrial waste heat cogeneration system, in particular to a Rankine cycle system for assisting industrial exhaust heat generation by utilizing a solar thermal collector. In the solar and industrial waste heat cogeneration system, a solar thermal collector, an intermediate heat exchanger and a work medium pump are sequentially connected in series to form a cycle; and the intermediate heat exchanger, an exhaust heat boiler, a steam drum of the exhaust heat boiler, a steam turbine, a power generator, a condenser, a deaerator, a water feeding pump and other equipment form the Rankine cycle generation system. A single pressure system or dual-pressure system can be adopted according to different parameters and different forms of the steam turbines, wherein in the single pressure system, the intermediate heat exchanger is used as the evaporator of the exhaust heat boiler and integrated with the exhaust heat boiler system for jointly producing superheated steam working medium; and in the dual-pressure system, the intermediate heat exchanger and a flash evaporator are used as independent equipment to be integrated with the exhaust heat boiler system. The system provided by the invention is beneficial to increasing the generated energy of generator sets for industrial exhaust heat generation, reducing the influence of the fluctuation of industrial exhaust heat to the generated energy, and simultaneously reducing the investment to simple solar thermal generation.

A refrigeration apparatus uses supercritical range refrigerant, and includes a multi-stage compression mechanism, a heat source-side heat exchanger, a usage-side heat exchanger, a switching mechanism switchable between cooling and heating operation states, an intermediate heat exchanger integrated with the heat source-side heat exchanger, and an intermediate heat exchanger bypass tube connected to the intermediate refrigerant tube so as to bypass the intermediate heat exchanger. The intermediate heat exchanger is connected to an intermediate refrigerant tube to draw refrigerant discharged from the first-stage compression element into the second-stage compression element, and functions as a cooler of the refrigerant discharged from the first-stage compression element and drawn into the second-stage compression element. The intermediate heat exchanger bypass tube ensures that refrigerant does not flow to the intermediate heat exchanger when a reverse cycle defrosting operation is performed.

The invention provides a composite secondly absorption type heat pump, belongs to the waste heat utilization heat pump technology. To keep the wide range and high-performance index of the second absorption heat pump at the same time, mostly takes the generator, condenser, pump and cold solution pump as the shared parts, adds a group of evaporator, absorber and accessories to compose the stair second category heat pump structure, the shared parts and the other components of the absorber, evaporator, absorb-evaporator or to increase generator, intermediate heat exchanger and accessories form the second category or multilevel heat pump structure, compose the whole composite unit to realize two or multi-heat pump flow at the same time; the solution pump respectively or in turn provide the concentrated solutions to each absorber, the cold-cold-fluid pump respectively provide the solution to the evaporator, absorb-evaporator, the waste heat medium flows the heat out through the evaporator, the heat medium get the different grade heat; the unit has simple structure, width heating interval, high utilization of waste heat.

The invention discloses a hybrid electric vehicle fuel cell thermal management system. The system is characterized in that the system comprises a fuel cell water loop, a PTC heating water loop, an airconditioning refrigeration system and a passenger compartment air inlet channel; and the fuel cell water loop and the PTC heating water loop exchange heat through an intermediate heat exchanger, andthe passenger compartment air inlet channel exchanges heat with the PTC heating water loop and the air conditioning refrigeration system. The invention further provides a control method of the hybridelectric vehicle fuel cell thermal management system. The control method comprises a fuel cell cold start mode and a fuel cell waste heat recovery mode. When a fuel cell is subjected to cold start andan environment temperature is relatively low, the PTC heating water loop can heat the fuel cell and a passenger compartment at the same time; and when the temperature of the fuel cell is too high, waste heat recovery is performed through the PTC heating water loop, the PTC heating water loop and the PTC heater heat the passenger compartment together, an energy utilization rate of the fuel cell isincreased, and the passenger compartment can be heated while cold start of the fuel cell is guaranteed.