(57) Abstract:The heat pump contains a refrigerant circuit including the compressor, oil separator, condenser, subcooler, a throttling organ, the evaporator and the line of oil circulation, including oil, additional oil cooler, oil pump and oil cooler connected to the compressor. To increase the heat output of the heat pump and ensure reliability in the refrigerant circuit of the heat pump installed in a throttling organ and consistently placed behind the subcooler heat exchanger-evaporator, annulus which is connected by piping with the annular space of the cooler, which, in turn, is connected to the compressor. 1 Il. The invention relates to refrigeration, particularly for units with screw compressors, and relates to heat pumps using oil flooded screw compressors.When calculating theoretical cycles and schematic diagrams vapor compression refrigerating machines it is known that increasing the condensing temperature of the working substance increases the degree of increase of the pressure and the evaporator, respectively), that leads to deterioration of volumetric and energy ratios of the compressors, which, in turn, increases the capital and operating costs of getting cold. In addition, with the growth of the Pto/P0increase loss by throttling and losses associated with the exhaust heat of superheat of the working substance. Formed by throttling the steam, entering first into the evaporator, and then into the compressor, requires for its advanced compression spent. In addition, the larger the temperature difference (Tto-T0), the more vapor is formed by throttling, and thus, a growing proportion of the work required for compression of steam. Therefore, the throttling can be appropriately dividing the pressure drop from the condenser Ptoto the evaporator P0into several parts, and after each step of throttling required steam extraction and its compression in the compressor. Studied that the work required to compress vapor from multiple throttling when his step-by-step removal and compression, less work required to compress a pair formed by a single throttle.Known heat pump that contains the compressor, condenser, subcooler, throttle is to-T0). However, the application of the regenerative heat exchanger increases the work of compression in the compressor. Apply also a multi-stage and cascaded heat pumps, in which the vaporous working medium is compressed sequentially, at least two compressors with low values of Pto/P0and then cooled in the condenser is divided into two sections. Thus throttling the working fluid in both stages is accompanied by lower total losses (E. I. Yantovsky, Y. C. Pustovalov /vapor compression heat pump installation. The publishing house "Energoizdat", M, 1982, S. 7-27).Known cooling system with oil flooded screw compressor, in which the loss reduction is achieved through a two-stage throttling the exhaust steam at intermediate pressure. The design is characterized by the presence of the heat exchanger and the two throttle valves instead of one. Formed as a result of the first throttling the steam passes from the heat exchanger to the compressor. Liquid supercooled refrigerant (main thread) after the heat exchanger is choked and enters the evaporator, where after evaporation is sucked by the compressor. Mandatory condition javlja large heat transfer coefficients of wet steam in the suction pipe and the suction path of the compressor, which moves the wet steam, there is an intensive heat exchange with the environment, leading to a deterioration of the energy characteristics of the compressor (Ed. by I. A. Sakuna /Refrigeration machines. Publishing house "engineering", 1985, S. 52-82).The disadvantage of these units is large, the intensity and large heat losses in all elements of the heat pump.Known heat pump containing a circulating refrigerant circuit, which established the oil flooded screw compressor, condenser, throttling the body and the evaporator. Circuit oil contains two parallel highways, one of which, in particular oil supply to the compressor into the cavity of the compression on the discharge side, includes oil separator, oil pump, oil cooler connected to the compressor and the cooler water is connected to the low-grade heat source (AV.St. SU 1783260, CL F 25 B 43/02, 1992). In high temperature heat pumps, when the condensation temperature exceeds 80oC, there are large pressure differences Pto/P0that leads, as already indicated, to a large thermal losses and unstable operation of the heat pump due to overheating of steam.The basis of the invention the goal is to create high-performance systems for the circulation of refrigerant and oil, providing operational reliability and efficiency of the heat pump.This task is solved in that in a heat pump that contains connected in series by refrigerant oil flooded screw compressor, oil separator, condenser, subcooler, a throttling organ, the evaporator and the circuit of the oil containing the two highways, one of which, in particular, connected with the feed line from the oil in the cavity of the compression ratio of the compressor at the discharge side, includes an oil separator, an additional oil cooler, oil pump, oil cooler connected to the compressor, as well as inlet and outlet of the coolant in the condenser, additional oil cooler connected to the heating water circuit, and the subcooler evaporator, connected to the low-grade heat source, according to the invention in a pump installed in a throttling organ and consistently placed behind the subcooler heat exchanger-evaporator, annulus which is connected by piping with the annular space of masloohladitelyah diagram of a heat pump supplementary heat exchanger-evaporator reduces the temperature of the liquid refrigerant, coming to the main evaporator of the heat pump, as well as to reduce the temperature of the oil supplied to the compressor due to the fumes coming from the annulus of the heat exchanger-evaporator into the compressor, and at the same time to drain the steam, which, ultimately, will allow to create conditions for heat pump operation in the optimal mode by improving the modes of operation of the compressor, and thus to improve the reliability of operation of the heat pump and heat output.The invention is further illustrated by the drawing, which shows a diagram of the proposed heat pump.The heat pump contains connected in series in the refrigerant evaporator 1, a compressor 2, a separator 3, a condenser 4, a subcooler 5, the first throttling body 6, the heat exchanger-evaporator 7, the second throttling body 8 and the circuit of the oil in the form of two highways, one of which, in particular, is connected to feed line oil into the cavity of the compression ratio of the compressor 2 at the discharge side to lubricate the bearings, contains the oil separator 3, an additional oil cooler 9, the oil pump 10, the oil cooler 11 made in the form of shell and tube heat exchanger pipes which is arielm 7 and the compressor 2. The coolant condenser 4 is connected to the circulation loop heating water 12, and additional oil cooler 9 connected in parallel and disposed of the heat generated from this node. On line water circulation in the supplementary oil cooler 9 is installed regulatory body 13 that is associated with a temperature sensor 14. The evaporator and subcooler water associated with low-grade heat sources,
The heat pump operates as follows. A pair of refrigerant from the evaporator 1 with injected into the compressor 2 oil and oil coming from the bearing chambers of the compressor 2, is compressed therein and then fed to the separator 3, where the separation of the condensed oil from the refrigerant vapor, which then enter the condenser 4. In the condenser 4, the refrigerant is condensed, and then the liquid refrigerant enters the subcooler 5. After the subcooler 5, the liquid refrigerant is divided into two streams: the lower part is choked in additional throttling body 6 and enters the annulus of the heat exchanger-evaporator 7, and most of it goes through the pipes of the heat exchanger-evaporator 7 and is cooled in teplosberezheniya body 8 and enters the evaporator 1. Hot oil, leaving the oil separator 3, enters the additional oil cooler 9 and the pump 10 is supplied to the oil cooler 11 and then into the compressor 2. Annulus of the oil cooler 11 is connected with the annular space of the heat exchanger-evaporator 7 in which the steam from the boiling of refrigerant in it after throttling it in additional throttling body 6. Pairs when passing through the annulus of the oil cooler 11 cool in the heat passing through the pipes oil, simultaneously dried and becomes superheated, and then enters the compressor 2. This eliminates the need for installing a heat exchanger for dehumidification of the refrigerant vapor.This invention allows the use of oil flooded screw compressors in high temperature heat pumps used in heating systems and hot water, with high thermal performance and reliability. Heat pump containing a refrigerant circuit including oil flooded screw compressor, oil separator, condenser, throttling body, an evaporator, an additional reactor and the separator, and the circuit of maslia, the oil separator and oil cooler connected to the compressor, characterized in that the circuit of the oil supplied to the second parallel line, oil pump and an additional oil cooler, the heat pump is equipped with a line inlet and outlet of the coolant in the condenser and additional oil cooler connected to the heating water circuit, and sequentially placed the subcooler and the heat exchanger-evaporator, annulus which is connected by piping with the annular space of the cooler, which, in turn, are connected via an additional pipe to the compressor, and the subcooler and an evaporator connected with a source of low-grade heat.
FIELD: power engineering, in particular, technology for transformation of heat by means of heat pumps, used in heating, conditioning and water supplying systems.
SUBSTANCE: device has circulation contour of working body, which includes serially connected compressor, capacitor, regenerative heat exchanger and first evaporator, and also line of second consumer, output of capacitor via heated substance is connected to line of first consumer. Input of ejector via active substance is connected to output of regenerative heat exchanger. Output of ejector is connected to input of first evaporator and through throttling valve is connected to input of second evaporator. Input of ejector via passive electronic substance is connected to line of second consumer. Output of second evaporator via separator is connected to line of third consumer.
EFFECT: extended functional capabilities of heat supplying systems and water supplying systems, namely, to receive in one apparatus both heat for heat supply system and cold at average temperature level for conditioning system and at low temperature level for cooling systems.
FIELD: heat engineering.
SUBSTANCE: heat pump comprises compressor, condenser, expander, evaporator, and heat exchanger. The inlet of the first space of the heat exchanger is connected with the outlet of the evaporator, and the outlet of the heat exchanger space is connected with the compressor. The inlet of the second space of heat exchanger is connected with the circuit between the condenser and expander through the control valve, and the outlet of the second space is connected with the circuit between the three-position control valve and expander. The expander is made of a throttle. The heat pump is provided with the temperature gauge mounted between the compressor and first space of the heat exchanger and is connected with the three-position control valve through controller.
EFFECT: enhanced reliability and stability of operation.
FIELD: heat power engineering.
SUBSTANCE: heat pump comprises compression cylinders, cylinder for adjacent tank with separating piston provided with individual heat exchangers, valving members, and high-pressure hydraulic pump connected in the closed circuit. Two additional cylinders interconnected through the valving members are connected in parallel between the inlets of the vertically oriented compression cylinders. The first additional cylinder is provided with a baffle. The pistons are interconnected with the rod passing through the opening made in the baffle. Two spaces formed by the walls of the baffle, pistons, and wall of the cylinder are provided with openings connected with the outlets of the three-way hydraulic switch whose inlets are connected with the inlet and outlet of the high-pressure hydraulic pump. The piston of the second additional cylinder is connected with the separating piston of the cylinder of the adjacent tank through the rod, rocking lever provided with hydraulic drive, and second heat insulated rod. The pistons of the compression cylinders are provided with displacers. The surfaces of displacers and inner surface of the compression cylinders adjacent to the air outlet of the cylinders are heat-insulated by means of solid heat insulator.
EFFECT: enhanced efficiency.
1 cl, 3 dwg
SUBSTANCE: invention relates to equipment for residential and industrial room heating. Compression heat pump consists of an evaporator, compressor, condenser, restrictor and liquid separator. The evaporator and condenser are represented with the enclosing vortex heat exchangers containing working agent supply and discharge nozzle and, respectively, low potential and high potential coolant supply and discharge nozzles, helical manifold with guiding unit and end walls. Micro channels are made on the internal and external surface of end walls. The enclosure is installed from the external surface side.
EFFECT: small-sized and high-capacity heat pump.
FIELD: heating systems.
SUBSTANCE: invention refers to heat engineering, and namely to heat pump devices. Heat pump includes evaporator, capacitor, throttle shutoff and control valves and vacuum pump, which are in-series included in closed circulation circuit of cooling agent. Vacuum pump is made with possibility of pumping cooling agent vapours with speed of 350 l/s within pressure range of 133 to 0.53·105 Pa. Invention provides the possibility of using a wide range of high-boiling matters as heat carriers with Tboiling >273°K at atmospheric pressure of matters. The most preferable is ethanol and its water solutions.
EFFECT: developing compact heating systems which do not require fuel margins and special communications, advantageous as to power and economy, and environmentally safe.
2 cl, 1 dwg
SUBSTANCE: present invention relates to compositions of a cooling agent or liquid heat carrier, which contain: approximately 1-99 wt % HFC-1234yf, approximately 99-1 wt % ammonia. The invention also relates to methods of producing heat, coldness, replacing cooling agent with large value of GWP using said composition, as well as a method of using said composition as a liquid heat carrier.
EFFECT: disclosed composition can be used as heat carrier.
7 cl, 6 ex, 14 tbl
SUBSTANCE: present invention relates to a composition of refrigerant agent or heat-transfer liquid, containing at least one compound selected from a group consisting of fluoroolefins of formula E- or Z-R1 CH=CHR2 , in which R1 and R2 independently denote a C1-C6 perfluoroalkyl groups, and where the said compound has at least 5 carbon atoms.
EFFECT: disclosed fluoroolefin compositions can be used to replace existing compositions of refrigerant agents or heat-transfer liquids, which have higher global warming potential; furthermore, compounds used in the composition are non-flammable.
34 cl, 11 ex, 17 tbl
FIELD: power industry.
SUBSTANCE: air conditioning system has four-way valve, heat exchanger and control, which are located indoors, control and heat exchanger, which are located outdoors, and which are connected in series to each other so that circuit is formed. Compressor steam-jet system includes compressor which has the first gas inlet hole, the second gas inlet hole and gas outlet hole. The first gas inlet hole is connected to four-way valve by means of gas-water separator. The second gas inlet hole is connected by means of bypass tube on which electrical expansion valve is located to indoor located control and outdoor located control. Gas outlet hole is connected to four-way valve. Indoor control is in-series connected by means of fluid tank to outdoor control. Bypass tube is located between indoor control and fluid tank and has the coil located inside fluid tank. Gas condition sensors are located at the first gas inlet hole, the second gas inlet hole and gas outlet hole. Depending on sensor readings the pressure of the second gas inlet hole of compressor is regulated so that volume of cooling agent jet can be maintained at optimum level.
EFFECT: higher heating capacity and efficiency of used energy at low ambient air.
8 cl, 3 dwg
FIELD: power engineering.
SUBSTANCE: heat exchange system comprises two heat pumps, every of which comprises a working cylinder, a piston separating the cylinder cavity into a working cavity filled with a working substance and a hydraulic drive cavity filled with a working liquid, and a heat exchanger installed in the working cavity. Both heat pumps have identical working cylinders, filled with identical quantity of the working substance, working cylinders are installed in the module in parallel to each other, and their pistons are equipped with stems, ends of which are kinematically connected to each other by means of a double-arm rocker.
EFFECT: using the invention will make it possible to increase a thermal coefficient due to reduction of power inputs, to provide for compact installation of thermal pumps.
6 cl, 2 dwg
FIELD: engines and pumps.
SUBSTANCE: energy-saving two-stage heat pump includes two units connected to each other and separated on the inside with a horizontal partition wall into isolated paths of plenum air and exhaust air. Air purifying filters, primary heat exchangers connected to each other by means of pipeline with a plate-type heat exchanger, a pump and solenoid-type valves, which are arranged on it, are installed in the first unit in the air flow direction in both paths. An additional heat exchanger and an adiabatic humidification plant are installed in the exhaust air path before the primary heat exchanger. A heat exchanger, an adiabatic humidification plant, a heater and a suction fan are installed in series in the air flow direction in the second unit in the plenum air path, and a compressor, a four-way valve, a heat exchanger and a fan are installed in series in the exhaust air path in the air flow direction. Heat exchangers in the second unit are interconnected in the paths.
EFFECT: increasing thermotechnical efficiency of the first utilisation stage at heating of plenum ambient air; eliminating the possible formation of ice on heat exchanger surfaces in exhaust flow; possible use of the first stage during the warm season of the year for cooling of plenum ambient air.
2 cl, 1 dwg
SUBSTANCE: receiver of refrigerating plant comprises cylindrical housing, vertical cylindrical stand pipe provided with a coil and mounted coaxially under the housing, and branch pipes for supplying and discharging coolant and discharging oil. The oil is additionally heated by means of a flat flexible heating member made of nonmetallic resistive materials. The heating member is secured to the outer surface of the bottom section of the stand pipe and is energized from 200-V AC power source.
EFFECT: enhanced efficiency.