JP3363574B2 - Heat pump device capacity control method and device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump device (hereinafter referred to as DDHP: Direct Drive He) using a Vilmier cycle suitable for an air conditioner and a hot water supply device.
Called at Pump. ), And more particularly, to a method and apparatus for controlling DDHP capacity.

[0002]

2. Description of the Related Art The DDHP is a device that directly causes cooling / heating and hot water supply by causing a pressure change only by a temperature distribution change of He (helium) gas as a sealed medium (working gas). Known examples of the heat pump device include, for example, JP-A-4-113170.

FIG. 2 shows a conceptual diagram of the operation principle of a general DDHP. In FIG. 2, He gas is provided in the external combustion engine 1 formed of a closed container by two regenerators (a high temperature regenerator 8 and a low temperature regenerator 9) and three thermal spaces (a high temperature space 2, a medium temperature space 3 and a low temperature space). It is enclosed in a space (4) (however, there is one pressure space). When the He gas passes through the high temperature regenerator 8 and the low temperature regenerator 9 by the movements of the high temperature side displacer 5 and the low temperature side displacer 6, the He gas is heated by the combustor 18 in the heater 7,
When cooled in the low temperature heat exchanger 11, the whole He gas is pressurized or depressurized. When the pressure is raised, the temperature of the refrigerant rises and is radiated to the intermediate temperature heat exchanger 10, and when the pressure is reduced, the temperature of the refrigerant falls and the heat is absorbed from the heater 7 and the cooler 14. As described above, the DDHP can perform hot water supply by utilizing heat radiation to the intermediate temperature heat exchanger 10 and can perform cooling by utilizing heat absorption from the cooler 14.

When such a DDHP is applied to an air conditioner, it is necessary to make the capacity variable in accordance with changes in load, and various capacity control methods for that purpose have been developed.

In the conventional DDHP capacity control,
By controlling the amount of combustion in the combustor 18 in accordance with the load, cold / hot water control for maintaining the cold / hot water of the intermediate temperature heat exchanger 10 and the low temperature heat exchanger 11 at a preset set temperature is adopted.

[0006]

However, in the variable capacity control of the DDHP, the combustion amount in the combustor 18 increases as the load increases. However, the temperature of the He gas, the heater 7 (heater tube) There is a possibility that the temperature of) exceeds the limit temperature that is allowable in terms of material.

However, it is important for the DDHP to operate in a state where the capacity is as close to the maximum capacity as possible in terms of operating efficiency, and the conventional cold / hot water control alone does not necessarily satisfy both the thermal limit of the device and the maximum performance. I can't expect that.

Therefore, it is an object of the present invention to provide a heat pump device capacity control method and device capable of exhibiting the maximum capacity within the thermal limit of DDHP.

[0009]

In order to solve the above-mentioned problems, the invention of a capacity control method for a heat pump device according to claim 1 is directed to combustion of a working gas sealed in an external combustion engine of the heat pump device for heating. In the capacity control method of the heat pump device for controlling the capacity of the heat pump by controlling the combustion amount in the reactor, a reference temperature lower than the limit temperature allowed for the heating part of the working gas in the external combustion engine is set. When the heating part temperature is a value less than the reference temperature, the combustion amount control is performed with reference to the cold / hot water temperature set value of the heat pump device, and when the heating part temperature is a value exceeding the reference temperature, It is configured to perform the combustion amount control with reference to the set reference temperature.

According to a second aspect of the present invention, there is provided an ability control method for a heat pump device, wherein the ability of the heat pump device is controlled by controlling a combustion amount of a working gas enclosed in an external combustion engine of the heat pump device. In the capacity control method of the heat pump device for controlling, set a reference temperature below the limit temperature allowed in the heating portion of the working gas in the external combustion engine, the temperature of the working gas is a value less than the reference temperature. In some cases, the combustion amount control is performed based on the cold / hot water temperature of the heat pump device,
When the temperature of the working gas exceeds the reference temperature, the combustion amount control is performed with the set reference temperature as a reference.

According to a third aspect of the invention of a heat pump device capacity control device, the heat pump capacity is controlled by controlling the combustion amount of a combustor that heats the working gas sealed in the external combustion engine of the heat pump device. In the capacity control device of the heat pump device that is configured to control the heating part temperature detecting means for detecting the temperature of the working gas heating part, a cold / hot water temperature detecting device for detecting cold / hot water temperature in the heat pump device, and When the heating portion temperature detection value is a value less than the reference temperature preset below the limit temperature allowed for the gas medium heating portion, the combustion amount of the combustor with reference to the preset cold / hot water temperature set value Control
And a control unit that controls the combustion amount of the combustor with the reference temperature as a reference when the heating temperature detection value exceeds the reference temperature.

The invention of a capacity control device for a heat pump device according to a fourth aspect is such that the capacity of the heat pump device is controlled by controlling the combustion amount of a combustor that heats a gas medium enclosed in an external combustion engine of the heat pump device. In the capacity control device of the heat pump device configured to control, the heating unit temperature detecting means for detecting the temperature of the working gas, the cold / hot water temperature detecting means for detecting the cold / hot water temperature in the heat pump device, and the working gas When the detected temperature value is less than the reference temperature preset below the limit temperature allowed for the gas medium heating unit, the combustion amount control of the combustor with reference to the preset cold / hot water temperature set value And a control means for controlling the combustion amount of the combustor with the reference temperature as a reference when the temperature detection value of the working gas exceeds the reference temperature. Configured to include a.

[0013]

According to the invention as set forth in claim 1, when the temperature of the heating portion of the external combustion engine is lower than the reference temperature, the combustion amount depends on the temperature difference between the cold / hot water temperature set value and the set value. Control (cooled / hot water temperature control) is performed, and when the heating portion temperature exceeds a reference value, combustion amount control (heating temperature control) is performed based on the reference temperature as a reference and the temperature deviation between the heating portion temperature and the reference temperature. .

Therefore, since the reference temperature is lower than the limit temperature allowed for the heating section, safety is ensured, and the heating temperature control is performed with reference to the reference temperature, so that the maximum capacity can be exhibited.

According to the second aspect of the present invention, when the working gas temperature of the external combustion engine is lower than the reference temperature, the combustion amount depends on the temperature difference between the cold / hot water temperature set value and the set value. When the control (cooled / hot water temperature control) is performed and the working gas temperature exceeds the reference value, the combustion amount control (working gas temperature control) is performed by the temperature deviation between the working gas temperature and the reference temperature with reference to the reference temperature. Be seen.

Therefore, since the reference temperature is lower than the limit temperature allowed in the heating section, safety is ensured, and the working gas temperature control is performed with reference to the reference temperature, so that the maximum capacity can be exhibited. . That is, the capacity of the heat pump device is mainly determined by the temperature of the working gas.

According to the third aspect of the present invention, the heating temperature detecting means detects the temperature of the heating portion, and the cold / hot water temperature detecting means detects the cold / hot water temperature. The control means executes the combustion amount control by comparing the cold / hot water temperature detected when the detected temperature of the heating unit is lower than the reference value with a preset value, and the temperature of the heating unit is set to the reference value. If it exceeds, the combustion amount control is executed by comparing the detected heating part temperature with the reference value.

According to the fourth aspect of the invention, the temperature of the working gas is detected by the working gas temperature detecting means, and the cold / hot water temperature is detected by the cold / hot water temperature detecting means. The control means executes the combustion amount control by comparing the cold / hot water temperature detected when the detected working gas temperature is lower than the reference value with a predetermined set value, and when the working gas temperature exceeds the reference value. In this case, the combustion amount control is executed by comparing the detected working gas temperature with the reference value.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of this embodiment will be described below with reference to the drawings.

FIG. 3 shows the configuration of the capacity control device of the heat pump device according to the present invention. Note that, in FIG. 3, the combustor 18, the combustion gas 19, and the DDHP 20 are the same as those shown in FIG. 2, and a description thereof will be omitted here.

As shown in FIG. 3, the DDHP 20 is provided with a gas temperature detector 21. Specifically, for example, referring to FIG. 2, the gas temperature detector 21 is provided by inserting a thin tube from the outside so that the detector is arranged in the high temperature space 2 of the external combustion engine 1. As the gas temperature detector 21, for example, a thermocouple is used. Gas temperature detector 2
The detection signal of 1 (THE) is sent to the controller 23.

A cold / hot water temperature detector 22 is provided at the cold / hot water outlet of the DDHP 20. The cold / hot water temperature detector 22 is specifically, for example, the intermediate temperature heat exchanger 10 and / or
Alternatively, a thermistor, for example, is used as the sensor, which is provided in the outlet pipe of the low temperature heat exchanger 11 toward the indoor unit 12. The detection signal (TW) of the controller 23 is sent to the controller 23.

The controller 23 is constructed by using a microprocessor and may be installed exclusively for the control of the present invention, but normally a controller for integrally controlling the entire DDHP 20 is used. The controller 23 executes the capacity control method of the heat pump device according to the present invention by the CPU while exchanging data with the built-in memory (RAM) not shown according to the control program stored in the built-in memory (ROM) not shown. To do. The calculation result of the CPU is the fuel control valve 26 as a combustion control signal (QG).
Given to. The fuel control valve 26 controls the opening of the fuel flow rate of the fuel pipe 27 according to the given combustion control amount QG.

As described above, the gas temperature detector 21, the cold / hot water temperature detector 22, the controller 23, the fuel control valve 26,
A feedback control loop is formed by the loop of the DDHP 20.

FIG. 4 shows an example of a control block by the controller 23. As shown in FIG. 4, the cold / hot water preset temperature TSET is set in advance for cold / hot water, and
The He gas set temperature TREF is set in advance for the gas. The He gas set temperature TREF is set to a value lower than the allowable limit temperature TLMT (TLMT> TREF) in consideration of the thermal limit temperature of the heater 7 of the external combustion engine 1 and its neighboring members and the thermal limit temperature of the He gas itself. To be done. Controller 2
Reference numeral 3 monitors or monitors whether or not the He gas detection temperature THE from the gas temperature detector 21 exceeds the He gas set temperature TREF by the He gas temperature deviation ΔTH which is a comparison calculation result in the comparator 25.

Next, the capacity control method of the heat pump device according to the present invention will be described with reference to FIG. 1 together with the operation of FIG.

Now, when the He gas detection temperature THE is less than the He gas set temperature TREF (step 102, N
O), cold / hot water detection temperature TW from cold / hot water temperature detection amount 22
Is compared with the He gas set temperature TREF in the comparator 24, and the cold / hot water temperature deviation ΔTW is input to the controller 23. The controller 23 calculates and controls the combustion control amount QG according to the cold / hot water temperature deviation ΔTW based on the inputted cold / hot water temperature deviation ΔTW (step 10).
0). For the control of the controller 23, PID control (proportional, integral, differential) is generally used in consideration of high speed.

On the other hand, when the He gas detection temperature THEE is detected (step 101) and the He gas detection temperature THEE exceeds the He gas set temperature TREF (step 102, YE).
S), the controller 23 switches the control from the cold / hot water control until then (step 100) to the He gas temperature control (step 103). Then, based on the He gas detection temperature THEE from the gas temperature detector 21 and the He gas set temperature TREF, and the He gas temperature deviation ΔTH which is the comparison result in the comparator 25, the combustion control amount QG is controlled to be the optimum value. To do.
The control in this case is also PID control.

The fuel control valve 26 is controlled by the combustion control amount QG thus obtained, and the enclosed H of the DDHP 20 is controlled.
Since the temperature of the e-gas is feedback-controlled, the maximum capacity of the heater 7 and the He gas within the allowable limit can be obtained.

It is needless to say that the present invention is not limited to the above embodiments and the following modes can be applied, and all of them belong to the scope of the present invention.

(1) Although the gas temperature detector 21 detects the temperature of the enclosed He gas in the high temperature space 2, the temperature of the tube wall of the heater 7 may be directly detected.

(2) Although the He gas has been described as an example of the working gas, it is also possible to use another inert gas that can be used for the DDHP 20.

(3) Although PID control is adopted as the control method of the controller 23, at least PI control may be used.

[0034]

As described above, according to the present invention, based on a highly safe temperature lower than the allowable limit temperature of the heating section and the working gas, and based on the temperature at which the DDHP can exhibit its maximum capacity. Since the combustion control is performed by switching between the cold / hot water control and the heating part temperature control, it is possible to control the capacity of the heat pump device with higher efficiency and safety than the conventional one.

[Brief description of drawings]

FIG. 1 is a block diagram showing a capacity control method of a heat pump device according to the present invention.

FIG. 2 is a diagram showing a working principle of a general DDHP.

FIG. 3 is a diagram showing a configuration of a capacity control device according to the present invention.

FIG. 4 is a control block diagram of a controller.

[Explanation of symbols]

1 External combustion engine 5 High temperature side displacer 6 Low temperature side displacer 7 heater 8 high temperature regenerator 9 Low temperature regenerator 10 Medium temperature heat exchanger 11 Low temperature heat exchanger 12 indoor units 13 radiator 14 Cooler 18 Combustor 19 Combustion gas 20 DDHP 21 Gas temperature detector 22 Cold / hot water temperature detector 23 Controller 24 comparator 25 comparator

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Claims (4)

(57) [Claims] 1. A heat pump device capacity control method for controlling the capacity of a heat pump device by controlling a combustion amount of a working gas sealed in an external combustion engine of the heat pump device, the method comprising: Set a reference temperature below the limit temperature allowed for the heating part of the working gas in a combustion engine, and if the heating part temperature is a value less than the reference temperature, the cold / hot water temperature set value of the heat pump device is used as a reference. Performing the combustion amount control as, when the heating part temperature is a value exceeding the reference temperature,
A capacity control method for a heat pump device, wherein the combustion amount control is performed on the basis of the set reference temperature. 2. A heat pump device capacity control method for controlling the capacity of a heat pump device by controlling the amount of combustion of a working gas sealed in an external combustion engine of the heat pump device, the method comprising: Setting a reference temperature lower than the limit temperature allowed for the heating portion of the working gas in a combustion engine, when the temperature of the working gas is a value less than the reference temperature, with reference to the cold water temperature of the heat pump device A capacity control method for a heat pump device, wherein the combustion amount control is performed, and when the temperature of the working gas is a value exceeding the reference temperature, the combustion amount control is performed with the set reference temperature as a reference. 3. A capacity control device for a heat pump device, wherein the capacity of the heat pump device is controlled by controlling the amount of combustion of a combustor that heats the working gas sealed in the external combustion engine of the heat pump device. A heating portion temperature detecting means for detecting the temperature of the working gas heating portion, a cold / hot water temperature detecting means for detecting the cold / hot water temperature in the heat pump device, and the heating portion temperature detection value is allowed in the gas medium heating portion. When the value is less than the reference temperature preset below the limit temperature to be performed, the combustion amount control of the combustor is performed with the preset cold / hot water temperature set value as a reference, and the heating temperature detection value is the reference temperature. And a control means for controlling the combustion amount of the combustor with the reference temperature as a reference. Apparatus. 4. A capacity control device of a heat pump device, wherein the capacity of the heat pump device is controlled by controlling the combustion amount of a combustor that heats a gas medium enclosed in an external combustion engine of the heat pump device. A heating portion temperature detecting means for detecting the temperature of the working gas; a cold / hot water temperature detecting means for detecting the cold / hot water temperature in the heat pump device; and a detected temperature value of the working gas allowed in the gas medium heating portion. When the temperature is less than the reference temperature preset below the limit temperature, the combustion amount control of the combustor is performed on the basis of the preset cold / hot water temperature set value, and the temperature detection value of the working gas is the reference. When the value exceeds the temperature, the control means for controlling the combustion amount of the combustor with the reference temperature as a reference, and the capability of the heat pump device. Control device.