JP2007218507A - Heat pump device and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump device excellent in reliability capable of generating high purity steam which can be directly supplied to a heat using facility while suppressing the erosion of a compressor vane caused by the inclusion of a lubricating medium of a bearing into the vapor of a working fluid, and a control method thereof. <P>SOLUTION: The heat pump device comprises turbo compressors for compressing steam as the working fluid (first-stage compressor 33 and a second-stage compressor 32), and a vaporizer 42 recovering heat from a heat source and vaporizing liquid water to generate steam. As the bearings of rotating shafts of the compressors, magnetic bearings (first magnetic bearing 1 and second magnetic bearing 2) are used. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat pump apparatus and a control method thereof.

A heat pump system using a turbo compressor using water as a working medium has already been put into practical use as a low-temperature heat source and is used in an air conditioning system or the like. For example, Japanese Patent Application Laid-Open No. 2001-165514 discloses a technique of integrally packaging an evaporator, a condenser, a compressor, and a drive motor in a single sealed container. Japanese Patent Laid-Open No. 63-231150 discloses a technique for supplying hot water of 100 ° C. or higher in a heat pump using water as a working medium.

JP 2001-165514 A JP 63-231150 A

  However, in any of the known examples, the countermeasure against leakage of the lubricating medium (oil or liquid) is not sufficient, and there is a high possibility that a large amount of lubricating medium is consumed. In addition, there is a possibility that the droplets of the lubricating medium are accompanied by the mainstream steam and collide with the blades of the compressor to generate erosion. In addition, when oil is used as the lubricating medium, the oil will be mixed into the mainstream steam, and heat pumps are used for heat utilization equipment such as drying and boiling of foods that require high-purity steam. It was necessary to supply the generated heat indirectly to the heat utilization facility by a heat exchanger. This leads to an increase in manufacturing cost and equipment due to the additional installation of the heat exchanger. In other words, high-purity water vapor that suppresses the occurrence of erosion due to the droplets of the lubricating medium being entrained by the mainstream vapor and colliding with the compressor blades, and the water vapor discharged from the heat pump can be directly supplied to the heat utilization equipment. It is desirable to generate.

  The object of the present invention is to reduce the occurrence of erosion of the compressor blades caused by mixing of the bearing's lubricating medium with the steam of the working fluid, and to produce high-purity steam that can be directly supplied to the heat utilization equipment, thereby improving reliability. It is in providing the heat pump apparatus excellent in the, and its control method.

  A turbo-type compressor that uses water vapor as a working fluid and compresses the water vapor; and an evaporator that recovers heat from a heat source to evaporate liquid water to generate water vapor, and the rotary shaft bearing of the compressor is a magnetic bearing. To do.

  According to the present invention, it is possible to suppress the occurrence of erosion of the compressor blade caused by mixing of the lubricating medium of the bearing with the steam of the working fluid, and to generate high-purity steam that can be directly supplied to the heat utilization equipment, thereby improving reliability. An excellent heat pump apparatus and its control method can be provided.

  INDUSTRIAL APPLICABILITY The present invention is applicable to business and industrial uses for supplying heat with steam in a heat pump that supplies heat. In particular, the present invention can be applied to a case where water (steam) is used as a working medium of a heat pump and a turbo type is used as a compressor.

Example 1
An embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 is a system configuration diagram of a heat pump apparatus according to an embodiment of the present invention. The heat pump apparatus of the present embodiment mainly includes an evaporator 42 that recovers heat from a heat source to evaporate liquid water to generate water vapor, a first-stage compressor 33 and a two-stage compressor 32 as a compression means, and a compressor. A drive source 17 that rotates and a piping system are provided. Furthermore, the heat pump system includes a heat utilization facility 20 that consumes heat, a supply system that can supply a medium to the heat utilization facility, and an external heat source (not shown) that heats water passing through the hot water system 40. Yes.

  The valve 39 of the water supply system 31 is opened to supply the liquid water 35 to the evaporator 42. In the evaporator 42, the liquid water 35 is heated by the hot water system 40 which is a heating means, and the vapor | steam 36 is produced | generated. The generated steam 36 is supplied to the first stage compressor 33. In this embodiment, as the compression means, a two-stage compressor including a first-stage compressor 33 and a two-stage compressor 32 is used. However, a compressor other than the two-stage compressor, such as a one-stage compressor or a three-stage compressor, is used. The above compressor may be used.

  The first-stage compressor 33 and the second-stage compressor 32 as compression means are rotated at high speed by the drive source 17 with the rotation center shaft 3 as a rotation axis. The rotation center shaft 3 is supported by the first magnetic bearing 1 and the second magnetic bearing 2. That is, in this embodiment, the bearing that rotatably supports the rotation shaft of the compression means of the heat pump device is a magnetic bearing.

  Here, the magnetic bearing is a bearing that supports the rotor by levitation by electromagnetic attractive force or repulsive force, does not require lubricating oil, and appropriately controls the electromagnetic attractive force or repulsive force. This is a bearing capable of suppressing the occurrence of excessive shaft vibration.

FIG. 2 shows an example of a magnetic bearing control circuit for suppressing shaft vibration. As shown in FIG. 2, the rotor 63 of the compressor is supported by a magnetic bearing. The magnetic bearing includes an electromagnet 61 for generating an electromagnetic attractive force or repulsive force for floating the rotor 63, a displacement sensor 62a and a displacement sensor 62b for measuring the rotor position, and a control device for controlling the rotor support. 64, a circuit 65 for transmitting the necessary electromagnetic force to the electromagnet 61 is provided. The rotor 63 rotates at a high speed in the rotation direction 66 in a state of being levitated by the electromagnetic force of the electromagnet 61 and is supported by a bearing. Mainly, in the control of the heat pump device, the electromagnetic force of the magnetic bearing is controlled based on the measured values of the displacement sensor 62a and the displacement sensor 62b of the rotor 63, which is the rotating shaft, and is supported rotatably. This control makes it possible to apply a magnetic bearing to the heat pump device and to suppress shaft vibration and the like.

  In the magnetic bearing control procedure, the position of the rotor is measured by the displacement sensor 62a and the displacement sensor 62b, and the rotor position information as the measurement result is transmitted to the control device 64. The rotor specification and the control device 64 calculate the electromagnetic force necessary for the electromagnet 61 based on the transmitted rotor position information, and transmit the necessary electromagnetic force to the electromagnet 61 through the circuit 65. The rotor is levitated by the electromagnetic force. Here, the magnetic bearing generates heat from the inside of the bearing due to its electromagnetic action. Therefore, it is desirable to cool the magnetic bearing so that the inside of the bearing is about 150 ° C. or less.

  In this embodiment, a cooling means for the magnetic bearing is provided. A separate cooling medium supply facility 11 is provided to cool the magnetic bearing to 150 ° C. or lower. A cooling medium is supplied from the cooling medium supply facility 11 to the first magnetic bearing 1 and the second magnetic bearing 2. As the cooling medium, air or other medium such as steam may be used.

  Next, the flow of fluid in the heat pump device will be described. Water that is a medium passing through the water supply system 31 is supplied to the evaporator 42 by opening / closing control of the valve 39. In the evaporator 42, heat is supplied from an external heat source (for example, about 80 ° C.) that is the hot water system 40, and the liquid water 35 is evaporated to generate water vapor. The steam is boosted and heated by the first-stage compressor 33 and the second-stage compressor 32 and supplied to the heat utilization facility 20. As an example of pressure and temperature conditions, the inlet of the first stage compressor 33 is about 0.2 at 60 ° C., the outlet of the first stage compressor 33 is about 1.0 at 100 ° C., and the outlet of the second stage compressor 32 is 4 ata. The water vapor is about 140 ° C.

  A drive source 17 is connected to the shaft ends of the rotary shafts of the first-stage compressor 33 and the second-stage compressor 32 as a drive machine to supply compression power necessary for compressing water vapor. However, the electrical system supplied to the drive source 17 is not shown.

  The evaporator 42 of the heat pump apparatus of the present embodiment has a hot water system 40 through which hot water warmed by an external heat source passes. The hot water supplied to the hot water system 40 is desirably generated using unused heat sources such as exhaust heat from factories and waste incineration plants, rivers, sewage, and air.

  In the embodiment of FIG. 1, the water in the hot water system 40 and the water in the evaporator 42 are indirect heat exchangers that do not come into direct contact, but the hot water in the hot water system 40 and the liquid water in the evaporator 42 are used. It may be a direct contact type heat exchanger in which is mixed. Moreover, as a heat transfer surface, either a heat exchanger in which tube-type piping is arranged in the liquid water accumulated in the evaporator, or a two-phase flow type plate heat exchanger, good.

  As described above, in this embodiment, a magnetic bearing is used to support the rotating shaft. For this reason, the lubrication medium supply equipment required for the oil lubricated bearing and the water lubricated bearing is not necessary.

  In addition, since no lubricating medium such as oil or liquid water is used, droplets inside the bearing chamber flow into the working steam, collide with the mainstream steam and collide with the compressor blades, causing erosion. Can be suppressed.

  Further, in a heat pump using an oil lubricated bearing, there is a possibility that the lubricating oil inside the bearing chamber flows out into the steam that is the working medium, and the lubricating oil is mixed into the steam. The heat generated by heat pumps is indirectly used by heat exchangers for heat-use equipment such as drying and boiling of foods that require high-purity water vapor by mixing lubricating oil with mainstream steam. It is necessary to supply the equipment. This leads to an increase in manufacturing costs and an increase in equipment size due to the additional installation of the heat exchanger.

  In the present invention, since a magnetic bearing is used for the bearing portion, no lubricating oil is used. For this reason, lubricating oil is not mixed into the steam that is the mainstream medium, and high-temperature steam generated by a heat pump is directly supplied and used even in heat utilization equipment facilities that require high-purity steam. It is possible to suppress an increase in manufacturing cost and an increase in equipment size due to the additional installation of the heat exchanger.

  Therefore, it is possible to suppress the occurrence of erosion of the compressor blades caused by mixing the bearing lubrication medium with the working fluid steam, and to produce high-purity steam that can be directly supplied to the heat utilization equipment, thus providing a highly reliable heat pump. An apparatus and a control method thereof can be provided.

(Example 2)
Another embodiment of the present invention will be described with reference to FIG. In the present embodiment, the flow path 6 is provided so that the first magnetic bearing 1 and the evaporator 42 communicate with each other, and the steam 36 taken out from the evaporator 42 is circulated inside the flow path 6 and led to the first magnetic bearing 1. Yes. Similarly, the flow path 7 is provided so that the second magnetic bearing 2 and the evaporator 42 communicate with each other, and the vapor 36 taken out from the evaporator 42 is circulated inside the flow path 7 and led to the second magnetic bearing 2. .

  The steam 36 introduced into the first magnetic bearing 1 and the second magnetic bearing 2 is used for cooling the magnetic bearing. A flow path 8 is provided so that the first magnetic bearing 1 and the inlet of the first stage compressor 33 communicate with each other. Similarly, the second magnetic bearing 2 and the inlet of the first stage compressor 33 communicate with each other. A flow path 9 is provided as described above.

  The steam 36 that has cooled the first magnetic bearing 1 and the second magnetic bearing 2 is introduced into the inlet of the first stage compressor 33 through the flow paths 8 and 9.

  The magnetic bearing generates heat from the inside of the bearing due to its electromagnetic action. Usually, the magnetic bearing must be cooled so that the inside of the bearing is about 150 ° C. or less. For example, in an example of the heat pump in the present embodiment, the steam 36 in the evaporator 42 has a pressure of about 0.2 ata and a temperature of about 60 ° C., and the temperature is sufficiently low, which is suitable for cooling a magnetic bearing.

  Further, the cooled steam is introduced into the inlet of the first stage compressor 33, but the inlet pressure of the first stage compressor 33 is slightly lower than the pressure inside the evaporator 42. For this reason, the steam after cooling the magnetic bearing naturally flows into the inlet of the first stage compressor 33 without providing a booster pump or the like.

  For this reason, it is possible to suppress an increase in equipment cost and an equipment area due to installation of a separate cooling medium supply equipment.

  Furthermore, since the amount of heat transferred to the cooling medium by the magnetic bearing cooling is recovered at the inlet of the first stage compressor 33, the system efficiency is also improved.

(Example 3)
Another embodiment of the present invention will be described with reference to FIG. In this embodiment, a branch point 12 is provided in the outlet flow path of the first stage compressor 33, a flow path 13 is provided so that the branch point 12 and the first magnetic bearing 1 communicate with each other, and the first stage compression is performed inside the flow path 13. The steam taken out from the machine 33 is circulated and led to the first magnetic bearing 1. Similarly, a flow path 14 is provided so that the second magnetic bearing 2 and the branch point 12 communicate with each other, and the steam taken out from the first-stage compressor 33 is circulated inside the flow path 14 and led to the second magnetic bearing 2. Yes.

  The steam introduced into the first magnetic bearing 1 and the second magnetic bearing 2 through the flow paths 13 and 14 is used for cooling the magnetic bearing. A flow path 8 is provided so that the first magnetic bearing 1 and the inlet of the first stage compressor 33 communicate with each other. Similarly, the second magnetic bearing 2 and the inlet of the first stage compressor 33 communicate with each other. A flow path 9 is provided as described above.

  The steam that has cooled the first magnetic bearing 1 and the second magnetic bearing 2 is introduced into the inlet portion of the first stage compressor 33 through the flow paths 8 and 9.

  According to an example of the heat pump according to the present invention, the steam at the outlet of the first stage compressor 33 has a pressure of about 1.0 ata and a temperature of about 100 ° C. and can be used for cooling the magnetic bearing.

  Further, the cooled steam is introduced into the inlet portion of the first stage compressor 33. The inlet portion pressure of the first stage compressor 33 is slightly lower than the pressure inside the evaporator 42, and is an example of the heat pump according to this embodiment. According to, it is below 0.2ata.

  The pressure on the steam inlet side of the magnetic bearing is equivalent to the pressure at the outlet portion of the first stage compressor 33, and the pressure on the steam outlet side of the magnetic bearing is equivalent to the inlet portion of the first stage compressor 33. For this reason, since the difference in the steam pressure between the steam inlet and the steam outlet of the magnetic bearing is larger than that in the second embodiment, the cooling steam having a larger flow rate than that in the second embodiment does not have a booster pump. It passes through the bearing 1 and the second magnetic bearing 2 and flows into the inlet of the first stage compressor 33.

  For this reason, it is possible to reduce the installation cost and installation area of a separate cooling medium supply facility. Furthermore, since the amount of heat transferred to the cooling medium by cooling the magnetic bearing portion is recovered to the inlet portion of the first stage compressor 33, the system efficiency is also improved.

  In addition, although the temperature of the cooling steam is higher than that of Example 2, since the flow rate of the cooling steam can be increased, the cooling capacity of the magnetic bearing portion is higher than that of Example 2 if appropriately designed. The reliability of the magnetic bearing can be increased.

Example 4
Another embodiment of the present invention will be described with reference to FIG. In the heat pump device according to the fourth embodiment, a valve 21 is provided in the flow path 6 through which steam is circulated, and a valve 22 is provided in the flow path 7, and whether or not steam is circulated to the magnetic bearing by opening and closing the valves 21 and 22. Can be controlled.

  The steam changes to a liquid when the temperature is lower than the saturated steam temperature, and moisture is generated. For this reason, when steam is circulated when the bearing atmosphere temperature of the first magnetic bearing 1 and the second magnetic bearing 2 is equal to or lower than the saturated steam temperature, moisture is generated and droplets (drains) can accumulate in the magnetic bearing. There is sex.

  When droplets are generated, they enter the rotor and become unbalanced, inducing excessive shaft vibrations, or the droplets flow into the mainstream steam and are entrained in the steam, causing the compressor blades to flow. May cause erosion.

  In the present embodiment, the ambient temperature inside the first magnetic bearing 1 and the second magnetic bearing 2 is monitored, and when the internal temperature rises to a temperature at which no droplets are generated by the steam, the valves 21 and 22 are opened to supply the cooling steam. Circulate in the magnetic bearing.

  The above-described control procedure around the first-stage compressor 33, the second-stage compressor 32, the valve 21, the valve 22, the first magnetic bearing 1, the second magnetic bearing 2, and the evaporator 42 will be described below in time series. .

  First, before starting the first-stage compressor 33 and the second-stage compressor 32, the valves 21 and 22 are closed. Next, the first stage compressor 33 and the second stage compressor 32 are started. The temperature of the first magnetic bearing 1 and the second magnetic bearing 2 is low immediately after startup, and is equal to the ambient temperature of the installation location of the equipment.

  When the first-stage compressor 33 and the second-stage compressor 32 are started, the temperature inside the first magnetic bearing 1 and the second magnetic bearing 2 gradually increases due to the rotation of the rotor. Here, when the temperature inside the first magnetic bearing 1 and the second magnetic bearing 2 becomes equal to or higher than the saturated steam temperature of the supplied steam, the valves 21 and 22 are opened. The steam supplied to the magnetic bearing in the fourth embodiment is the steam 36 inside the evaporator 42. According to an example of the heat pump, the saturated steam temperature of the steam 36 is about 60 ° C.

  In the above control, before reaching the saturated steam temperature (60 ° C.), the valves 21 and 22 are closed so that the cooling steam does not flow through the magnetic bearings 1 and 2, but the magnetic bearing is generally about 150 ° C. No problem because of the heat resistant temperature.

When the temperature inside the magnetic bearing becomes equal to or higher than the saturated steam temperature to be supplied, the valve 21,
Since the cooling steam is circulated through the first magnetic bearing 1 and the second magnetic bearing 2 by opening 22, it is possible to suppress the generation of droplets due to the condensation of the steam inside the bearing.

  Next, a control procedure for stopping the compressor will be described in time series.

  First, the rotation of the compressor is stopped. At this time, as the rotation stops, the temperature of the magnetic bearing gradually decreases.

  The temperature inside the magnetic bearing is monitored, and the valves 21 and 22 are closed when the temperature falls below the heat resistant temperature of the magnetic bearing. Since the heat-resistant temperature of the bearing is generally about 150 ° C., the ambient temperature immediately before closing the valve is equal to or higher than the saturated steam temperature. For this reason, generation | occurrence | production of the droplet by the condensation of the vapor | steam inside a magnetic bearing can be suppressed.

  According to said control, generation | occurrence | production of the droplet within a magnetic bearing can be suppressed, generation | occurrence | production of an excessive shaft vibration and generation | occurrence | production of the erosion of a compressor blade can be suppressed.

  In addition, although the valve 21 and the valve 22 in the present embodiment have been described as an example with respect to the second embodiment, the same effect can be obtained by providing the heat pump of the third embodiment with a valve in the steam flow path 13 and the flow path 14. Can be obtained.

  At this time, since the cooling steam supplied to the magnetic bearing is the steam at the outlet of the first stage compressor, the saturated steam temperature of the cooling steam is different from that of the second embodiment. For this reason, the valves provided in the steam flow paths 13 and 14 are opened when the temperature becomes equal to or higher than the saturated steam temperature at the outlet of the first stage compressor. According to an example of the heat pump, the saturated steam temperature at the outlet of the first stage compressor is 100 ° C.

(Example 5)
Another embodiment of the present invention will be described with reference to FIG. The heat pump device according to the fifth embodiment has a drain pipe 23 for taking out moisture inside the first magnetic bearing 1 to the outside, and a drain pipe 24 for taking out moisture inside the second magnetic bearing 2 to the outside.

  In the heat pump device of the present embodiment, the first magnetic bearing 1 and the second magnetic bearing 2 are cooled by steam, so that when the temperature inside the magnetic bearing decreases during operation stop, the steam inside the magnetic bearing condenses and liquids. Drops can occur.

  If droplets are generated, the problem is that rust is generated inside the magnetic bearing, and if the droplets are left running, the droplets enter the rotor and become unbalanced, causing excessive shaft vibration. In addition, there is a possibility that the droplets flow out into the mainstream steam and are accompanied by the steam and collide with the blades of the compressor to generate erosion.

  In the present embodiment, since the drain pipes 23 and 24 for taking out moisture inside the magnetic bearing to the outside are provided, even if droplets are generated, they can be removed to the outside.

  For this reason, generation | occurrence | production of the excessive shaft vibration and the erosion of a compressor blade | wing by the droplet inside a magnetic bearing can be suppressed.

  In addition, although drain piping 23 and 24 in a present Example was demonstrated as an example with respect to Example 2, by providing a drain piping in the 1st magnetic bearing 1 and the 2nd magnetic bearing 2 also in the heat pump of Example 3, Similar effects can be obtained.

The system block diagram of the heat pump apparatus which is Example 1 of this invention is shown. The block diagram of the magnetic bearing of the heat pump apparatus which is Example 1 of this invention is shown. The system block diagram of the heat pump apparatus which is Example 1 of this invention is shown. The system block diagram of the heat pump apparatus which is Example 1 of this invention is shown. The system block diagram of the heat pump apparatus which is Example 1 of this invention is shown. The system block diagram of the heat pump apparatus which is Example 1 of this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 1st magnetic bearing, 2 ... 2nd magnetic bearing, 3 ... Center axis of rotation, 6, 7, 8, 9, 13, 14 ... Flow path, 11 ... Cooling medium supply equipment, 12 ... Branch point, 17 ... Drive Source, 20 ... heat utilization equipment,
21, 22, 39 ... valve, 23, 24 ... drain piping, 31 ... water supply system, 32 ... two-stage compressor, 33 ... one-stage compressor, 35 ... liquid water, 36 ... steam, 40 ... hot water system, 42 ... Evaporator, 61 ... electromagnet, 62a, 62b ... displacement sensor, 63 ... rotor, 64 ... control device, 65 ... circuit, 66 ... rotational direction.

Claims (11)

A heat pump device comprising a turbo-type compressor that uses water vapor as a working fluid and compresses the water vapor, an evaporator that recovers heat from a heat source and evaporates liquid water to generate water vapor,
A heat pump apparatus characterized in that a bearing of a rotary shaft of the compressor is a magnetic bearing. A heat pump device comprising a turbo-type compressor that uses water vapor as a working fluid and compresses the water vapor, an evaporator that recovers heat from a heat source and evaporates liquid water to generate water vapor,
The rotary shaft bearing of the compressor is a magnetic bearing,
A heat pump device comprising a cooling medium supply device for supplying a cooling medium for cooling the magnetic bearing to the magnetic bearing. In a heat pump device equipped with a turbo-type compressor using steam as a working fluid, a drive for driving the compressor, and an evaporator for recovering heat from a heat source and evaporating liquid water,
The bearing of the compressor is a magnetic bearing,
A heat pump device comprising: a flow path through which steam passes in the magnetic bearing; and a structure for flowing the steam into the magnetic bearing through the flow path. In a heat pump device comprising a turbo compressor using water vapor as a working fluid, a drive for driving the compressor, an evaporator for recovering heat from a heat source and evaporating liquid water,
The bearing of the compressor is a magnetic bearing,
A heat pump apparatus comprising: a flow path communicating with the magnetic bearing and the evaporator; and supplying the vapor in the evaporator through the flow path into the magnetic bearing. The heat pump device according to claim 4,
A heat pump device comprising a flow path that communicates between the magnetic bearing and an inlet portion of the compressor, and configured to supply steam in the magnetic bearing to the inlet portion of the compressor through the flow path. In a heat pump device comprising a turbo compressor using water vapor as a working fluid, a drive for driving the compressor, an evaporator for recovering heat from a heat source and evaporating liquid water,
The compressor bearing is a magnetic bearing,
A heat pump device comprising a flow path for communicating the magnetic bearing and a compressor outlet, and supplying steam from the outlet of the compressor to the magnetic bearing through the flow path. In the heat pump device according to claim 6,
A heat pump device comprising a flow path for communicating the magnetic bearing and an inlet portion of the compressor, and supplying the vapor in the magnetic bearing to the inlet portion of the compressor through the flow path. In the heat pump device according to any one of claims 3 to 7,
A valve is provided in a path for circulating steam to the magnetic bearing,
A heat pump device that controls the flow of steam to the magnetic bearing by controlling the valve. In the heat pump device according to any one of claims 1 to 8,
A heat pump device comprising a drain for taking out moisture in the magnetic bearing to the outside.   An evaporator for generating water vapor, a compressor for compressing the water vapor using the generated water vapor as a working fluid, and a supply system capable of supplying the water vapor compressed by the compressor to a heat utilization facility. A heat pump apparatus characterized in that the bearing of the rotating shaft is a magnetic bearing. A heat pump apparatus comprising: an evaporator that generates water vapor; a compressor that compresses the water vapor using the generated water vapor as a working fluid; and a supply system that can supply the water vapor compressed by the compressor to heat utilization equipment A control method for a heat pump apparatus, wherein the bearing of the rotary shaft of the compressor is a magnetic bearing, and the electromagnetic force of the magnetic bearing is controlled based on a measured value of a displacement sensor of the rotary shaft.

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