33results about "Compression machines with non-reversible cycle" patented technology

The present invention relates to a refrigeration or air-conditioning apparatus which utilizes a vapor compression refrigeration system having a refrigerant circulating therethrough that comprises a compressor powered by an engine exhaust gas driven turbine. A mini centrifugal compressor may advantageously be used with such an apparatus, thus allowing the use of low GWP refrigerants. The present invention further relates to methods for powering a compressor, such as a mini-centrifugal compressor, in a refrigeration or air-conditioning apparatus, and methods for controlling compressor surge, impeller speed and cooling capacity.

A capacity control algorithm for a multiple compressor liquid chiller system is provided wherein the speed and number of compressors in operation are controlled in order to obtain a leaving liquid temperature setpoint. In response to an increase in the load in the chiller system, the algorithm determines if a compressor should be started and adjusts the operating speed of all operating compressors when an additional compressor is started. In response to a decrease in the load in the chiller system with multiple compressors operating, the algorithm determines if a compressor should be de-energized and adjusts the operating speed of all remaining operating compressors when a compressor is de-energized.

A temperature regulation system has a polished surface sufficiently smooth so as to reduce the emissivity of the surface. A conduit is in thermal proximity to the polished surface and is in communication with a source of coolant. The coolant is circulated through the conduit so as to transfer heat from the surface to the coolant. System may include a sprayed-on resistive heater. An a temperature controlled vessel has a heat transfer wall that is of an electrically conductive material that is coated with a durable thermally conductive and electrically nonconductive coating. The coating may be a sprayed on coating and the vessel may hold a buffer for performing electrophoresis.

A control system controls adaptively an operation of a vapor compression system. The control system includes a memory for storing a mapping relationship between control inputs of the vapor compression system, and a processor for executing a supervisory controller and an optimization controller. The supervisory controller controls the operation of the vapor compression system using a set of control inputs selected according to the mapping relationship. The optimization controller modifies the mapping relationship in response to the operation of the vapor compression system.

A device for cooling a heat source of a motor vehicle is provided that includes a cooling body which has a plurality of feed flow channels and a plurality of return flow channels. At least a multiplicity of the feed flow channels and return flow channels are arranged adjacent to one another in an alternating fashion in the cooling body.

The invention discloses a freezing device. When the opening of the electronic expansion valve (14) is less than the specified opening, or the superheat of the evaporator (15) is greater than the specified superheat, it is judged that the refrigerant circulation is insufficient, and the evaporator fan ( 22) The air volume is reduced.

The embodiments described herein include a control system and method for a compressor that is operable with a climate system. The control system enables optimal climate system operation by efficiently controlling the operating speed of the compressor.

A subcooling heat exchanger and subcooling expansion valve in a refrigeration system provide subcooling of a pre-subcooled portion, for refrigerating a thermal load, of condensed refrigerant liquid by a pre-subcooling portion of the condensed refrigerant liquid. The amount of subcooling of the pre-subcooled portion is determined by measuring, with a pressure sensor, refrigerating suction pressure exerted by refrigerating compressors of the system. A controller then controls, based on the refrigerating suction pressure, modulation of mass of pre-subcooling portion, relative pre-subcooled portion, and expansion thereof in the subcooling expansion valve, which controls the amount of refrigerant heat exchanged, and therefore subcooling of pre-subcooled portion, between the pre-subcooling portion and the pre-subcooled portion in the subcooling heat exchanger. The pre-subcooling portion is then subsequently compressed by a subcooling compressor.

Disclosed are an air conditioning system and a method for controlling an operation thereof, whereby a charging device for charging power to be supplied into the indoor unit is employed, a chargeable control unit is separately employed, or a separate control unit connectable between the indoor unit and an electronic expansion valve is employed, thereby closing the electronic expansion valve even if power supplied into the indoor unit is blocked while controlling opening and closing of the electronic expansion valve, and additionally preventing the electronic expansion valve from being left open, resulting in prevention of an overload of a compressor within an indoor unit.

The invention discloses an auto-cascade heat pump with a middle throttling element and an adjusting method thereof. The heat pump comprises a single compressor, a condenser, an air-liquid separator, a condensing evaporator, an evaporator and a throttling valve, wherein non-azeotropic refrigerants containing two or more components are adopted as refrigerants. On the circulation basis of an original auto-cascade heat pump, the middle throttling element is added, the refrigerants at a condenser outlet, which are in a less dryness and undercooling state, can be used for eliminating the negative influence of condenser outlet state change caused by working condition changes on the system performance and taking the effect of obviously optimizing the performance by adjusting the mass flow ratio of the high-boiling point refrigerant and the low-boiling point refrigerant enriched in a middle throttling degree reasonable distribution system. The invention has the advantages of good suitability, simple structure, energy-saving operation and great working temperature difference.

A vapor compression cooling system includes a centrifugal compressor(s) for compressing a primary fluid in a cycle including at least two compressions, and a control module for controlling the centrifugal compressor dependent upon at least a condition of a secondary fluid. The module controls a power of the centrifugal compressor by adjusting a speed of the motor driving the compressor and/or an opening of guide vanes associated with at least one impeller. The module may also control a pressure drop of a primary fluid moving through at least one expansion device. The at least two compressions may be made in parallel or in series. A related method includes compressing a primary fluid in a first and a second compression cycle and adjusting a parameter of the compressor dependent upon a calculated desired power of the compressor.

The invention discloses an ultra-low ambient temperature air source heat pump unit using the daily range of the outdoor temperature of a heat storage balance chamber. The heat pump unit comprises a quasi-secondary (two-stage) compressor, an indoor heat exchanger, an economist, a main electronic expansion valve, an outdoor heat exchanger, a first auxiliary electronic expansion valve, a second auxiliary electronic expansion valve, an energy storage water tank, a first solenoid valve, a second solenoid valve, a circulating water pump, a four-way reversing valve, and a gas liquid separator. Duringthe day, at the noon with the not very low outdoor temperature, the unit has excess heat stored in the energy storage water tank, when the outdoor temperature is very low at night, the unit uses thestorage heat to heat and gasify the compressor for gas supplement, the heat absorbed from the outside absorption of the unit is equivalent to the sum of the heat absorbed from the environment of the outdoor heat exchanger and the heat absorbed from the heat storage water of the gas supplement, when the operating state of the compressor is unchanged, the unit heat can be increased by 32% or higher,and the heat requirements in the ultra-low temperature environment of the unit are met, so that the daily range of the outdoor temperature is balanced.

The present invention relates to an air conditioner. The air conditioner according to the present embodiment has a refrigeration capacity of 11 kW to 16 kW, inclusive, and uses R134a as a refrigerant circulating therein, and since a refrigerant pipe therein is made of a ductile stainless steel material having 1% or less of a delta-ferrite matrix structure with respect to the grain size area thereof, the refrigerant pipe can maintain strength and hardness as good as or better than those of a copper pipe, while also maintaining good processability.

The invention relates to a refrigerating-type first-aid backpack heat-preservation system and a working method thereof. The refrigerating-type first-aid backpack heat-preservation system comprises a heat-preservation structure and a backpack, inserting strips are arranged at the end, close to the backpack, of the heat-preservation structure, inserting grooves are formed in the backpack, a cavity is formed in the backpack, the inserting grooves communicate with the cavity, the heat-preservation structure is internally provided with a heat-preservation cavity, through grooves are formed in the inserting strips and communicate with the heat-preservation cavity, when the backpack and the heat-preservation structure are not separated, the inserting strips are inserted into the inserting grooves, and the through grooves communicate with the cavity. By arranging the structure that the backpack and the heat-preservation structure can be separated, when objects in the backpack need to be used,the inserting grooves of the backpack only need to be separated from the inserting strips of the heat-preservation structure, sealing strips on the backpack are inserted into the inserting grooves, and thus the backpack can be taken away separately; and when the objects in the backpack need to be subjected to heat preservation, the backpack can be refrigerated through a refrigerating structure only by inserting the inserting strips into the inserting grooves, when the emergency situation occurs, refrigerated objects can be taken away at any time and can be subjected to heat preservation at anytime, and the refrigerating-type first-aid backpack heat-preservation system is suitable for the outdoor space and the indoor space.

Provided is an indoor unit (1) of an air conditioning system. The indoor unit (1), by means of an indoor fan (6), blows out from an exhaust port (5) conditioned air obtained by heat-exchange from a heat exchanger (3) that uses a slightly combustible refrigerant or a combustible refrigerant having a specific gravity higher than that of air. The indoor unit (1) is provided with: a refrigerant sensor (8) that detects a leaking refrigerant; and an exhaust port opening/closing mechanism capable of closing a part of the exhaust port (5). When the refrigerant sensor (8) detects leakage of the refrigerant, the indoor fan (6) is driven in the state where the part of the exhaust port (5) is closed by the exhaust port opening/closing mechanism.

This invention provides an optical device capable of efficiently cooling an optical modulator and preventing deterioration of an optical image formed by the optical modulator. In the optical device equipped with an optical modulation device having the optical modulator which modulates light fluxes emitted from a light source according to image information and forms the optical image, openings according to an image formation area of the optical modulator and a holding frame which holds the optical modulator, the openings according to the image formation area of the optical modulation device are formed, a container-like cooling medium encapsulation part in which a cooling medium which cools the optical modulator is encapsulated is provided on the light flux incident side and/or the light flux emitting side of the optical modulation device, the cooling medium encapsulation part is provided with a first cooling chamber which performs sealing encapsulation of the cooling medium in a space including the openings and a second cooling chamber which is formed by being demarcated from the first cooling chamber, guides and circulates other cooling medium from the outside of the cooling medium encapsulation part at a position avoiding the openings.

The invention discloses a heat pump system and relates to the technical field of air conditioning equipment. The heat pump system comprises a compressor, a four-way reversing valve, an economizer, a first heat exchanger, a third heat exchanger, a first one-way valve, a third one-way valve, a second one-way valve and a fourth one-way valve, wherein the first one-way valve and the third one-way valve are connected in series and conducting directions of the first one-way valve and the third one-way valve are set in a back-to-back manner; and the second one-way valve and the fourth one-way valve are connected in series and conducting directions of the second one-way valve and the fourth one-way valve are set in a face-to-face manner; a public communication point A is arranged on a pipeline between the first one-way valve and the third one-way valve, and a public communication point B is arranged on a pipeline between the second one-way valve and the fourth one-way valve; the other end of the first one-way valve is conned with the second one-way valve, and a public communication point C is arranged on a pipeline between the first one-way valve and the second one-way valve; and the other end of the third one-way valve is connected with the fourth one-way valve, and a public communication point D is arranged on a pipeline between the third one-way valve and the fourth one-way valve. The heat-pump system has the beneficial effects that a plurality of one-way valves are adopted to form a valve group, so that installing structure is simple, and the workload of workers in the installing process is reduced.

The invention discloses a two-stage compression refrigeration system, a refrigeration control method and refrigeration equipment. The two-stage compression refrigeration system comprises a first-stagecompression unit, a second-stage compression unit, a condenser, a first-stage throttling element, a first evaporator and a second evaporator which are connected in sequence. An exhaust port of the first-stage compression unit is connected with an air suction port of the second-stage compression unit through an intermediate cooling pipeline, an outlet of the first evaporator is connected with theintermediate cooling pipeline, an outlet of the second evaporator is connected with the air suction port of the first-stage compression unit, the first evaporator is connected with a switching module,refrigerants sequentially flow through the condenser, the throttling element and the switching module, and the switching module can be switched to feed the liquid refrigerant or the gaseous refrigerant into the first evaporator. Switching can be carried out when different refrigeration requirements are met, and the energy consumption of the system is effectively reduced.