KR20100077278A - A control method of compressor for hot water circulation system associated with heat pump - Google Patents

Abstract

PURPOSE: A compressor control method of a heat pump interlocked heated water circulating system is provided to maximize a heating efficiency by maintaining the frequency lowering speed of a compressor. CONSTITUTION: A compressor control method of a heat pump interlocked heated water circulating system comprises: a step of confirming an operation mode of a heat pump coupling circulating heated water system(S100); a step of operating the compressor and the heater assembly when the heat pump coupling circulating heated water system is in a heating mode(S200); and a step of equivalently transforming the frequency of the compressor in operation of the heater module to the time variation(S300).

Description

A control method of compressor for hot water circulation system associated with heat pump

According to the present invention, when the heater is operated during heating operation, even if the temperature of the water flowing into the water refrigerant heat exchanger rises, the compressor frequency of the compressor changes by the same, so that the heating efficiency is maximized. It relates to a control method.

The hot water supply and heating device interlocked with the heat pump is a device in which a heat pump cycle and a hot water circulation cycle are combined. It is a device to make.

Therefore, heat for hot water supply and floor heating is supplied through heat of the refrigerant discharged from the compressor or a heater provided separately.

However, in the conventional heat pump interlocked hot water circulation system, regardless of whether the heater is operated at the time of heating operation, it is controlled to reach the heating target temperature by changing the frequency of the compressor according to the change in the water temperature, so that the use time of the heater is increased and the energy is increased. There is a problem that the efficiency is lowered.

In addition, the time to reach the heating target temperature is delayed, there is a problem that the heating efficiency is lowered.

Therefore, the ease of use is reduced, causing the user to be dissatisfied with emotion, and there is a problem in that product satisfaction is reduced.

The present invention has been proposed to improve the above problems, and when the heater is operated during the heating operation, even if the temperature of the water flowing into the water refrigerant heat exchanger rises, the frequency lowering speed of the compressor is kept constant over time. It is an object of the present invention to provide a compressor control method of a heat pump interlocking hot water circulation system to maximize heating efficiency.

The present invention provides a heat pump circulating system including a heat pump refrigerant cycle including a compressor, a water heat exchange cycle including a water refrigerant heat exchanger and a heater assembly, a hot water supply unit for supplying hot water, and a heating unit for indoor heating. In the compressor control method, the operation mode check step of confirming the operation mode of the heat pump interlocking hot water circulation system, and the heater operation step of operating the compressor and the heater assembly when the heat pump interlocking hot water circulation system is the heating mode; A heating capacity compensating step of changing the frequency of the compressor with respect to a time change during the operation of the heater assembly, and the compressor maintains operation when the heating measurement temperature is higher than the heating preset temperature, and the operation of the heater assembly is stopped. It is characterized by consisting of a heating operation maintenance step.

In the heating capacity compensation step. The compressor is characterized in that the frequency is gradually lowered.

In the heating capacity compensation step, the compressor frequency is characterized in that it exceeds the minimum set frequency.

In the heater operation step, the heater assembly is characterized in that it has a maximum amount of heat.

In the present invention, when the heater is operated during the heating operation, even if the temperature of the water flowing into the water refrigerant heat exchanger rises, the frequency of the compressor is configured to change.

Therefore, the user's emotional discomfort is eliminated by reducing the time for reaching the heating preset temperature.

In addition, there is an advantage that the heating performance and energy efficiency is maximized.

Hereinafter, with reference to the drawings will be described an embodiment in which the spirit of the present invention is implemented.

1 is a view showing a heat pump interlocking hot water circulation system employing an embodiment of the present invention, Figure 2 is a perspective view showing the configuration of an indoor unit constituting a heat pump interlocking hot water circulation system employing an embodiment of the present invention.

1 and 2, the heat pump interlocked hot water circulation system 1 according to an embodiment of the present invention includes an outdoor unit 2 including a heat pump refrigerant cycle and a phase change along the heat pump refrigerant cycle. An indoor unit 3 including a water heat exchange cycle for exchanging heat with a refrigerant to heat water, and a hot water supply part 4 connected to the heat exchanger in any part of the indoor unit 3 to supply hot water. And a heating part 5 composed of a water pipe extending from the indoor unit 3.

In detail, the heat pump refrigerant cycle includes a compressor 21 for compressing the refrigerant at a high temperature and a high pressure, a four-way valve 22 for adjusting a flow direction of the refrigerant discharged from the compressor 21, A water-refrigerant heat exchanger 31 for exchanging high-temperature and high-pressure refrigerant passing through the four-way valve 22 with water flowing along the water pipe of the indoor unit 3, and the water-cooled heat exchanger An expansion part 24 for allowing the refrigerant passing through the 31 to expand at low temperature and low pressure and an outdoor heat exchanger 23 for allowing the refrigerant passing through the expansion part 24 to heat exchange with the outdoor air.

The parts are connected by the refrigerant pipe 25 to form a closed circuit. The outdoor unit 2 includes the compressor 21, a four-way valve 22, an expansion unit 24, and an outdoor heat exchanger 23. When the outdoor unit 2 is operated in the cooling mode, the outdoor heat exchanger 23 performs the function of the evaporator, and when the outdoor unit 2 is operated in the heating mode, the outdoor unit 2 performs the function of the condenser.

The compressor 21 is a main component of the present invention, and an inverter compressor having a variable refrigerant compression capacity is applied.

The control method in the heating mode operation with respect to the compressor 21 will be described in detail below.

The outdoor unit 2 is provided with a plurality of sensors for detecting the operating state of the internal components. That is, at the refrigerant outlet side of the outdoor unit 2, a compressor discharge pressure sensor 212 for measuring the refrigerant pressure discharged from the compressor 21, and a compressor discharge temperature sensor for measuring the refrigerant pressure discharged from the compressor 21 ( 214 is provided.

In addition, one side of the outdoor heat exchanger 23 is provided with a heat exchanger temperature sensor 232 for measuring the temperature of the refrigerant heat-exchanged with air.

In addition, the indoor unit 3 is equipped with a first refrigerant temperature sensor (TH1), the second refrigerant temperature sensor (TH2) for measuring the temperature of the inlet refrigerant pipe and the outlet refrigerant pipe of the water refrigerant heat exchanger (31). The water extraction temperature sensor TH3 and the inlet temperature sensor TH4 for measuring the temperature of the inlet water pipe and the outlet water pipe of the water refrigerant heat exchanger 31 may be provided.

In addition to the above sensors, a plurality of sensors are further provided, but will be described in detail when describing the detailed configuration of the indoor unit.

Hereinafter, except for the defrosting operation, the description will be limited to the operation in the heating mode.

On the other hand, in the indoor unit 3, a flow switch mounted on the water refrigerant heat exchanger 31 and a water pipe extending on the outlet side of the water refrigerant heat exchanger 31, and detecting a flow of water. (32), an expansion tank (33) branched at a point spaced apart from the flow switch (32) in the direction of water flow, and water extending from the outlet side of the water refrigerant heat exchanger (31). A heater assembly 34 into which an end of the pipe is inserted, and an auxiliary heater 344 is provided therein, and a water pump 36 provided at a point of an outlet pipe of the heater assembly 34. Included.

In detail, the water refrigerant heat exchanger 31 is a portion in which the refrigerant flowing along the heat pump refrigerant cycle and the water flowing along the water pipe heat exchange, and a plate heat exchanger is applicable. In the water refrigerant heat exchanger (31), heat (QH) is transmitted from the high temperature and high pressure gas refrigerant passing through the compressor (21) to the water flowing along the water pipe. Water introduced into the water refrigerant heat exchanger 31 is lukewarm through a hot water supply process or a heating process. In addition, the inlet and outlet pipes of the water refrigerant heat exchanger 31 are equipped with an outlet temperature sensor TH3 and an inlet temperature sensor TH4, respectively.

In addition, the expansion tank 33, while passing through the water refrigerant heat exchanger 31 performs a buffer function that absorbs when the volume of the heated water is expanded to an appropriate level or more. The expansion tank 33 contains a diaphragm to move in response to a volume change of water in the water pipe. The expansion tank 33 is filled with nitrogen gas.

In addition, the heater assembly 34 is configured to allow the water passing through the water refrigerant heat exchanger 31 to be heated by the auxiliary heater 344, and the heater reservoir 347 and the heater reservoir 347 to form an appearance. It is configured to include an auxiliary heater 344 is a part built-in to generate heat.

When the heater assembly 34 does not reach the required heat amount during the defrosting operation process or the water refrigerant heat exchanger 31, the auxiliary heater 344 is selectively operated, and the heat pump interlocked hot water circulation system is When operating in heating mode, it operates to maintain the maximum calorific value for faster heating.

The heater reservoir 347 is configured to reheat the auxiliary heater 344 by passing water discharged from the water refrigerant heat exchanger 31 to the inside, and the inside of the heater reservoir 347 is shielded from the outside. It becomes a state.

The inside of the heater reservoir 347 is configured to communicate with the three-way valve 71 and the water refrigerant heat exchanger 31.

Accordingly, the water discharged from the water refrigerant heat exchanger 31 may flow into the three-way valve 71 after being introduced into the heater reservoir 347.

An air vent 343 is formed at an upper side of the heater assembly 34 to discharge the superheated air present in the heater assembly 34. In addition, a pressure gauge 341 and a relief valve 342 may be provided at one side of the heater assembly 34 so that the pressure in the heater assembly 34 may be appropriately adjusted.

For example, when the water pressure inside the heater reservoir 347 displayed through the pressure gauge 341 is excessively high, the relief valve 342 is opened so that the pressure in the heater reservoir 347 is properly adjusted. can do. In addition, the heater outlet temperature sensor (reference numeral TH5 of FIG. 1) for measuring the temperature of the water may be mounted on one side of the heater reservoir 347.

On the upper surface of the heater reservoir 347 is provided with overheat prevention means 348 for selectively blocking the power supplied to the auxiliary heater 344 as shown in FIG.

That is, the overheat preventing means 348 is configured to block the power supply when the auxiliary heater 344 is overheated to prevent damage of the auxiliary heater 344 in advance. To this end, the overheat prevention means 348 is configured to block the power supply when the current value of the auxiliary heater 344 is more than the set current value.

In addition, the overheat preventing means 348 may be configured to cut off the power supplied to the auxiliary heater 344 when the temperature of the auxiliary heater 344 is greater than or equal to a safe temperature, the operation of the auxiliary heater 344 is a heater output It may be interlocked with the temperature measured by the temperature sensor (TH5), it may be configured to control the operation of the auxiliary heater 344 by having a separate temperature sensor inside the heater reservoir 347.

In addition, the overheat prevention means 348 may be applied to a bimetal whose degree of bending varies with temperature change.

In other words, bimetal is a rod-shaped part made by superimposing two kinds of thin metal plates having different thermal expansion coefficients, and when the heat is applied, the bimetal is used to bend toward a metal plate having a relatively small coefficient of thermal expansion. OFF is possible.

Of course, when the bimetal is cooled below a predetermined temperature, the bimetal may be returned in the opposite direction to be bent to induce power supply to the auxiliary heater 344 by turning on the switch contact.

The heater assembly 34 is coupled so that the auxiliary heater 344 and the heater reservoir 347 can be separated from each other. That is, since the auxiliary heater 344 is a consumable part, it needs to be replaced when the heat generation performance is lowered or the end of life is used for a long time.

Thus, the auxiliary heater 344 is configured to be selectively removable from the heater reservoir 347.

To this end, the auxiliary heater 344 and the heater reservoir 347 may be configured to be screwed together.

On the other hand, the auxiliary heater 344 is configured to vary the amount of heat generated according to the amount of water and the water temperature introduced into the heater reservoir 347.

That is, the auxiliary heater 344 is composed of a plurality of heating elements (not shown), the plurality of heating elements are each configured to selectively generate heat and have the same amount of heat.

Therefore, when the amount of water introduced into the heater reservoir 347 is small, power is applied to only one of the heating elements to generate heat, and if the amount of water gradually increases or the water temperature decreases, the number of operating elements of the heating element is increased. It is configured to be.

The water pump 36 pumps the water discharged through the water pipe extending from the outlet side of the heater reservoir 347 to be supplied to the hot water supply unit 4 and the heating unit 5.

On the discharge side of the water pump 36, a pump discharge pressure sensor 362 is provided as shown in FIG. The pump discharge pressure sensor 362 is configured to sense the pressure of the water discharged by the pump pump (36).

In addition, a control box 38 for storing various electrical components is mounted on one side of the indoor unit 3, and a control panel 37 is provided on the front of the indoor unit 3. In detail, the control panel 37 may be provided with a display unit 370 such as an LCD panel and various input buttons.

In addition, the control box 38 serves to control the operation of the indoor unit 3 and the outdoor unit 2 during the operation of the heat pump linked hot water circulation system.

On the other hand, the hot water supply unit 4 is a portion that the user warms and supplies the water required for work such as washing or washing dishes.

That is, at a point spaced apart from the water pump 36 in the direction of water flow, a three-way valve 71 for controlling the flow of water is provided. The three-way valve 71 is a directional valve for allowing the water pumped by the water pump 36 to flow into the hot water supply section 4 or the heating section 5.

Accordingly, the hot water supply pipe 48 extending to the hot water supply unit 4 and the heating pipe 53 extending to the heating unit 5 are connected to the outlet side of the three-way valve 71. The water pumped by the water pump 36 is selectively flowed to either the hot water supply pipe 48 or the heating pipe 53 under the control of the three-way valve 71.

The hot water supply unit 4 includes a hot water tank 41 for storing water supplied from the outside and allowing the stored water to be heated, and a hot water heater 42 provided inside the hot water tank 41. In addition, an auxiliary heat source for supplying heat to the hot water tank 41 may be further added according to the installation form.

As the auxiliary heat source that can be presented, a heat storage tank 43 using solar heat is possible. In addition, one side of the hot water supply unit 4 is provided with an inlet 411 for the introduction of cold water, and a water outlet 412 for discharging the heated water.

In detail, a part of the hot water supply pipe extending from the three-way valve 71 is introduced into the hot water tank 41 to heat the water stored in the hot water tank 41. That is, heat is transferred from the hot water flowing along the inside of the hot water supply pipe 48 to the water stored in the hot water tank 41.

In certain cases, the hot water heater 42 and the auxiliary heat source may operate to supply additional heat. For example, it may operate when the water needs to be heated in a short time, such as when the user needs a lot of hot water to take a bath.

According to an embodiment, the water outlet 412 may be connected to a hot water discharge device such as a shower 45 or a home appliance such as a humidifier 46. When the heat storage tank 43 using solar heat is used as the auxiliary heat source, the heat storage pipe 47 extending from the heat storage tank 43 may be inserted into the hot water tank 41.

In addition, an auxiliary pump 44 for controlling the flow rate inside the heat storage pipe closed circuit is mounted on the heat storage pipe 47, and a direction switching valve VA for controlling the flow direction of water in the heat storage pipe 47 is mounted. Can be. And, any one side of the heat storage pipe 47 may be equipped with a heat storage tank temperature sensor (TH7) for measuring the temperature of the water.

The auxiliary heat source structure, such as the heat storage tank 43 using the above-described solar heat is not limited to the embodiments shown, it will be found that it can be mounted in different positions in various forms.

On the other hand, in the heating part 5, a part of the heating pipe 53 is formed by embedding a floor heating part 51 embedded in an indoor floor, and branched from any point of the heating pipe 53 and the floor heating part. An air heating unit 52 connected in parallel with the 51 is included.

In detail, the floor heating unit 51 may be buried in the form of a meander line (meander line) on the indoor floor as shown. In addition, the air heating unit 52 may be a fan coil unit or a radiator.

In addition, a part of the air heating pipe 54 branched from the heating pipe 53 is provided to the air heating part 52 as a heat exchange means. At the point where the air heating pipe 54 is branched, flow path switching valves 55 and 56 such as three-way valves are installed, and the refrigerant flowing along the heating pipe 53 passes through the floor heating part 51 and the air. It may be divided into the heating unit 52 or flow to only one side.

In addition, an end portion of the hot water supply pipe 48 extending from the three-way valve 71 is laminated at a point spaced apart from the outlet end of the air heating pipe 54 in the direction of water flow. Therefore, in the hot water supply mode, the refrigerant flowing along the hot water supply pipe 48 is introduced into the water refrigerant heat exchanger 31 after being recombined with the heating pipe 53.

Here, the check valve (V) is installed at the point requiring the back flow block, such as the point where the hot water supply pipe 48 is joined with the heating pipe 53, it is possible to prevent the back flow of water. In the same context, in addition to the method of installing the flow path switching valve 56, a check valve may be installed at the outlet end of the air heating pipe 54 and the outlet end of the floor heating part 51, respectively.

Hereinafter, a method of controlling a compressor for maximizing heating efficiency when the heat pump interlocked hot water circulation system configured as described above is operated in a heating mode will be described with reference to FIGS. 3 and 4.

3 is a flowchart illustrating a compressor control method of the heat pump interlocked hot water circulation system according to the present invention, and FIG. 4 is a time lapse during the heating capacity compensation step, which is one step in the compressor control method of the heat pump interlocked hot water circulation system according to the present invention. Is a graph showing the frequency change state of the compressor.

Compressor control method of the heat pump interlocking hot water circulation system according to the present invention, the operation mode check step (S100) for confirming the operation mode of the heat pump interlocking hot water circulation system (1) and the heat pump interlocking hot water circulation Heater operation step (S200) for operating the compressor and the heater assembly when the system 1 is in heating mode, and the frequency of the compressor 21 is changed such that the frequency of the compressor 21 changes with respect to the time change during the operation of the heater assembly 34. The heating capacity compensating step (S300) and, when the heating measurement temperature is equal to or higher than the heating set temperature, the compressor 21 maintains the operation, the operation of the heater assembly is composed of the heating operation maintenance step (S400) to stop.

That is, in the compressor control method as described above, when the heater assembly 34 is operated in the heating operation mode so that the water temperature flowing into the water refrigerant heat exchanger 31 rapidly increases, the operation frequency of the compressor 21 is equivalently changed. This is to control the rapid heating by using the maximum heat generation amount of the heater assembly 34 and the heat of the compressor 21 by controlling.

Therefore, when the heating operation mode is selected in the operation mode check step (S100), the control box 38 operates the compressor 21 and then supplies power to the heater assembly 34, and the heater assembly ( 34) operates at the maximum calorific value.

At this time, the control box 38 is controlled so that the operating frequency of the compressor 21 is equivalently changed as time passes from the heater operation time point (A in FIG. 4).

More specifically, the control box 38 is controlled to gradually lower the frequency of the compressor 21 in the heating capacity compensation step (S300).

Therefore, the temperature of the water flowing along the heating pipe 53 is rapidly increased to increase the heating efficiency.

When the heating preset temperature set by the user becomes less than the heating measurement temperature during the heating capacity compensating step (S300), the heater assembly 34 stops the operation, and the frequency of the compressor 21 is the lowest. The heating operation maintenance step S400 is performed by compressing the refrigerant above the set frequency (reference numeral B of FIG. 4).

In this case, the heating measurement temperature is preferably the temperature of the water measured by the heater discharge temperature sensor (TH5) is applied, the minimum set frequency means the minimum frequency that the compressor 21 of the inverter type can operate.

On the other hand, when the heating preset temperature exceeds the heating measurement temperature, the heater assembly 34 is operated to have a maximum amount of heat to be able to continuously heat the water flowing in the heating pipe 53.

The scope of the present invention is not limited to the above-described embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the scope of the present invention.

1 is a view showing a heat pump interlocking hot water circulation system employing an embodiment of the present invention.

Figure 2 is a perspective view showing the configuration of the indoor unit constituting the heat pump interlocking hot water circulation system employing an embodiment of the present invention.

Figure 3 is a flow chart showing a compressor control method of the heat pump interlocking hot water circulation system according to the present invention.

Figure 4 is a graph showing the frequency change state of the compressor over time during the heating capacity compensation step, which is a step in the compressor control method of the heat pump linked hot water circulation system according to the present invention.

* Description of the symbols for the main parts of the drawings *

1. Heat pump linked hot water circulation system 2. Outdoor unit

3. Indoor unit 4. Hot water supply unit

5. Heating 212. Compressor discharge pressure sensor

214. Compressor discharge temperature sensor 362. Pump discharge pressure sensor

S100. Operation mode check step S200. Heater operation step

S300. Heating capacity compensation step S400. Heating operation maintenance step

Claims (4)

Compressor control of a heat pump interlocking hot water circulation system including a heat pump refrigerant cycle equipped with a compressor, a water heat exchange cycle equipped with a water refrigerant heat exchanger and a heater assembly, a hot water supply unit for a hot water supply, and a heating unit for indoor heating In the method, An operation mode checking step of checking an operation mode of the heat pump linked hot water circulation system; A heater operation step of operating a compressor and a heater assembly when the heat pump linked hot water circulation system is in a heating mode; A heating capacity compensation step of varying the frequency of the compressor with respect to the time change during the operation of the heater assembly; The compressor control method of the heat pump linked hot water circulation system, characterized in that the compressor maintains the operation when the heating measurement temperature is above the heating set temperature, the operation of the heater assembly is stopped in the heating operation maintenance step. The method of claim 1, wherein in the heating capacity compensation step. Compressor control method of the heat pump linked hot water circulation system, characterized in that the frequency of the compressor is gradually lowered. According to claim 2, In the heating capacity compensation step, The compressor frequency is a compressor control method of the heat pump linked hot water circulation system, characterized in that exceeding the lowest set frequency. According to claim 2, In the heater operation step, The heater assembly is a compressor control method of a heat pump linked hot water circulation system, characterized in that it has a maximum amount of heat.

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