CN103267362B - Constant temperature flow control method for heat pump water heater and double-system unit using same - Google Patents
Constant temperature flow control method for heat pump water heater and double-system unit using same Download PDFInfo
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- CN103267362B CN103267362B CN201310239541.5A CN201310239541A CN103267362B CN 103267362 B CN103267362 B CN 103267362B CN 201310239541 A CN201310239541 A CN 201310239541A CN 103267362 B CN103267362 B CN 103267362B
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Abstract
The invention discloses a constant temperature flow control method for a heat pump water heater and a double-system unit using the same, relates to a fluid heater utilizing a heat pump and a control method thereof, and particularly relates to a constant temperature flow control method for the heat pump water heater and a double-system primary heating type heat pump water heater unit using the method. The double-system primary heating type hot pump water heater unit comprises a heat pump system A, a heat pump system B, a water supply heating system C and a constant temperature flow control device, wherein PID regulation on water flow is performed according to outlet water temperature; an outlet water temperature set value is set as a target value, and the opening of a constant temperature flow valve is controlled according to a checking value of the outlet water temperature so as to adjust the water flow; when the temperature of a water box is low, a constant temperature water pump and a compressor are started, and the unit operates at constant temperature; when inlet water temperature is too high, a bypass-valve is opened; and one system in a double-system generates a fault and stops operation, the outlet water set temperature is down-adjusted, the water flow of a heat pump unit is guaranteed, and the condensation effect and heating capacity and energy efficiency of the unit are improved, so that the other system without the fault is safely and stably operated in an efficient manner.
Description
Technical field
The present invention relates to a kind of fluid heater and the control method thereof that utilize heat pump, particularly relate to dual system heating type heat pump hot water group of a kind of constant temperature flow control methods for heat pump water-heating machine and use the method.
Background technology
The high speed of the non-renewable and global reserves of current coal, oil, natural gas etc. " the fossil class energy " reduces; bring global energy shortage; add going from bad to worse of ball ecological environment; make to preserve the ecological environment, accelerate development and utilize regenerative resource, become the urgent and difficult task of the mankind.Air-source heat pump hot water as energy-conserving and environment-protective have also been obtained extensive accreditation, the fine market prospects of energy-conserving product, also creates revolutionary alternative trend to traditional water heating equipment.Air source heat pump hot water product mainly contains heated type, circulating heating type, a static heated type, heating type heat pump hot water because install simple, the little engineering cost of engineering water pipeline caliber is low, cold water does not enter heat storage water tank and hot water is stable etc., and plurality of advantages is able to large-scale popularization.Chinese invention patent " a kind of plural serial stage waterway single heating type heat pump water heating machine " (Chinese invention patent ZL 200710143443.6, Authorization Notice No. CN 100501267C) disclose a kind of plural serial stage waterway single heating type heat pump water heating machine, be made up of at least two relatively independent heat pumps and plural serial stage water system, in whole level (namely highest) heat pump, add condensed liquid refrigerant heat regenerator; Wherein: the water inlet of Hot water units is connected to the water inlet of this cold-producing medium heat regenerator, the delivery port of this cold-producing medium heat regenerator is connected to the condenser water inlet of first order heat pump, the leaving condenser water mouth of first order heat pump is connected to the condenser water inlet of second level heat pump, by that analogy, until the leaving condenser water mouth of whole level heat pump; The fluorine side-entrance of this cold-producing medium heat regenerator accesses the liquid refrigerant of the condenser discharge of whole level heat pump, and the fluorine side outlet of this cold-producing medium heat regenerator is connected to the throttling arrangement import of whole level heat pump.Chinese invention patent " a kind of proportional regulation type heating type heat pump hot water " (Chinese invention patent ZL201110096160.7, publication number CN102162681A) disclose a kind of proportional regulation type heating type heat pump hot water, heat storage water tank is connected with Double-system condenser by pipeline, Double-system condenser is provided with two cover heatings, be respectively heating one and heating two, the upper outlet of heating one is connected by two-way electromagnetic valve with the lower part outlet of heating two, the lower part outlet of heating one is connected with the upper outlet of heating two, the upper outlet of heating two forms a loop by the lower part outlet of three-way magnetic valve and heating two, heat storage water tank is provided with a water intaking valve, and water intaking valve is connected with heat storage water tank by threeway Ratio Temp control valve, between threeway Ratio Temp control valve and three-way magnetic valve, be provided with water pump.This invention is by environment-identification temperature, and water system water route is connect and changes serial connection form into, and the discharge of two heatings doubles, and increases condensation effect, improve heating capacity and the efficiency of source pump, simultaneously unit can stablize again, the operation of safety.
But refrigeration system is damaged or under numerous influence factor such as one of them leaving water temperature damage in start, defrost, low ambient temperature, dual system, there is the problem being difficult to realize long-term safety, stable, Effec-tive Function in the control logic of existing system.
Summary of the invention
The object of the invention is to provide a kind of constant temperature flow control methods for a dual system heating type heat pump hot water group, solve the technical problem using computer program to realize the constant temperature Flow-rate adjustment of a dual system heating type heat pump hot water group.
The present invention solves the problems of the technologies described above adopted technical scheme:
A kind of heat pump water-heating machine constant temperature flow control methods, for monolithic processor controlled dual system heating type heat pump hot water group, is characterized in that comprising the following steps:
S100) coolant-temperature gage setting value Tws and water temperature return difference setting value Twd is read out;
S160) temperature of each temperature-sensing element is detected in real time by temperature signal collection processing module; The on off state of each switching signal is detected in real time by switching signal acquisition processing module;
S180) prescribe a time limit under heat storage water tank water level is lower than water level, according to the startup timing requirements of source pump, open entering water electromagnetic valve, make constant temperature flow valve be opened to initial opening, unit starting once heats operational mode;
S200) prescribe a time limit under water level is lower than water level, open entering water electromagnetic valve, start compressor, unit enters and once heats operational mode S300;
S300) once operational mode is heated: call constant temperature flow valve pid algorithm, with water outlet temperature setting value Tws for desired value, control constant temperature flow valve aperture according to leaving water temperature detected value Tw, regulating water flow, makes leaving water temperature Tw and water outlet temperature setting value Tws be consistent;
S380) when the water level of storage tank reaches designated water level, unit is out of service;
When S400) reducing because of heat radiation as water tank temperature Ts, open constant temperature water pump, compressor, unit enters temperature-constant operation Mode S 420;
S420) temperature-constant operation pattern: when water tank temperature Ts is lower than water outlet temperature setting value Tw-water temperature return difference setting value Twd, open constant temperature water pump, compressor, unit carries out temperature-constant operation, and after water tank temperature Ts reaches water outlet temperature setting value Tws, unit exits temperature-constant operation pattern;
S500) when inflow temperature is too high, when leaving water temperature Tw exceeds the adjustable range of constant temperature flow valve, by-passing valve is opened; After in the adjustable range that leaving water temperature is reduced to constant temperature flow valve, close by-passing valve.
The one preferably technical scheme of heat pump water-heating machine constant temperature flow control methods of the present invention, is characterized in that the constant temperature flow valve pid algorithm described in step S300 comprises the following steps:
S320) according to leaving water temperature Tw and delivery temperature Tp, according to following condition determination delivery temperature correction value Δ Tp:
If Tp > is Tw+50, Δ Tp=5;
If Tw+20≤Tp≤Tw+50, Δ Tp=0;
If Tp < is Tw+20, Δ Tp=-3;
S340) according to formula
△T＝(Tw-Tws)+ΔTp；
Ks＝S*△T；
Determine constant temperature flow valve aperture Ks; Wherein, Tw is leaving water temperature detected value, and Tws is water outlet temperature setting value, and Tp is delivery temperature, and Δ Tp is delivery temperature correction value, and Ks is constant temperature flow valve aperture, and S is governing speed coefficient, S=10 ~ 20.
The better technical scheme of one of heat pump water-heating machine constant temperature flow control methods of the present invention, it is characterized in that step S340 is according to the difference between leaving water temperature Tw and water outlet temperature setting value Tws, change the governing speed of constant temperature flow valve, wherein, governing speed coefficient S is determined according to following condition:
As 5 < △ T, S=20;
When-5≤△ T≤5, S=10;
When △ T <-5, S=20.
The preferred technical scheme of one of heat pump water-heating machine constant temperature flow control methods of the present invention, characterized by further comprising constant temperature mode of priority and once heats running priority mode selecting step:
S200) if select temperature-constant operation mode of priority, then regardless of the water level of water tank, as long as water tank temperature Ts is lower than water outlet temperature setting value Tws-water temperature return difference Twd, unit proceeds to temperature-constant operation pattern immediately;
S220) once heat running priority pattern if select, no matter then water tank temperature Ts is how many, as long as water level is lower than water level lower limit, unit proceeds to immediately and once heats operational mode.
The technical scheme of a kind of improvement of heat pump water-heating machine constant temperature flow control methods of the present invention, characterized by further comprising the thermostatically controlled step of low ambient temperature:
S120) when environment temperature Th is lower than-5 DEG C, water outlet temperature setting value Tws is adjusted to 40 DEG C; Select temperature-constant operation mode of priority, ensure that water tank temperature Ts reaches design temperature.
The technical scheme of the another kind improvement of heat pump water-heating machine constant temperature flow control methods of the present invention, characterized by further comprising dual system resultant fault state rate-determining steps:
S140) judging the running status of heat pump A and heat pump B, when there is the fault that compressor can not open when there being a system in dual system, water outlet temperature setting value Tws being adjusted to 40 DEG C.
The technical scheme of a kind of further improvement of heat pump water-heating machine constant temperature flow control methods of the present invention, characterized by further comprising the process that defrost running status controls, described defrost running status control procedure comprises the following steps:
S600) arrange two fin temperature sensors respectively in each system of a dual system heating type heat pump hot water group, the detected temperatures mean value of foundation two fin temperature sensors, as fin temperature Tc, determines that defrost starts and exits temperature; When open circuit or short trouble appear in fin temperature sensor, use temperature that another fin temperature sensor detects as fin temperature Tc, determine defrost startup and exit temperature;
S620) defrost entry condition:
As environment temperature Th > 15 DEG C, unit does not enter defrost;
When 7 DEG C of < environment temperature Th≤15 DEG C,
During water tank temperature Ts > 45 DEG C, unit does not enter defrost;
During water tank temperature Ts≤45 DEG C, run after 90 minutes, if fin temperature Tc continues to reach 5 minutes lower than 0 DEG C, then unit enters defrost;
When-2 DEG C of < environment temperature Th≤7 DEG C, run after 40 minutes, if fin temperature Tc continues to reach 5 minutes lower than-4 DEG C, then unit enters defrost;
When environment temperature Th≤-2 DEG C, run after 30 minutes, if fin temperature Tc continues to reach 5 minutes lower than Th-3 DEG C, then unit enters defrost;
If environment temperature Th <-2 DEG C and continue 120 minutes, unit does not also reach except defrost entry condition, then unit force enter defrost;
S640) defrost exit criteria:
Time within 3 minutes defrost time, if fin temperature Tc reaches 6 DEG C, then exit defrost;
When the defrost time is after 3 minutes, if fin temperature Tc reaches 12 DEG C, then exit defrost;
10 minutes are reached, then compulsory withdrawal defrost when the defrost time.
Another object of the present invention to provide a kind of dual system heating type heat pump hot water group using above-mentioned heat pump water-heating machine constant temperature flow control methods, solve that unit is efficient under various operating mode, safety, stable operation problem.
The present invention solves the problems of the technologies described above adopted technical scheme:
Use dual system heating type heat pump hot water group of above-mentioned heat pump water-heating machine constant temperature flow control methods, comprise heat pump A, heat pump B, for water heating system C and constant temperature volume control device; Heat pump A and heat pump B comprises one group of compressor respectively, cross valve, expansion valve, and the air source heat pump that finned heat exchanger and gas-liquid separator connect to form is characterized in that:
Described comprises double-tube heat exchanger, entering water electromagnetic valve, constant temperature flow valve and constant temperature water pump for water heating system C; Tap water inlets is connected to the cold water inlet of described double-tube heat exchanger successively by described entering water electromagnetic valve and constant temperature flow valve; Heat storage water tank is connected to the thermostatted water entrance of described double-tube heat exchanger by constant temperature water inlet, and the thermostatted water outlet of described double-tube heat exchanger is connected to described heat storage water tank by constant-temperature effluent mouth again, forms thermostatted water closed circuit; By-passing valve is connected in parallel at the two ends of described constant temperature flow valve;
Described constant temperature volume control device comprises single chip control unit, one group of temperature-sensing element, and one group of switching signal element and control signal export driver element;
Described temperature-sensing element comprises the exhaust gas temperature sensor of the delivery temperature Tp for obtaining compressor, for obtaining the water tank temperature sensor of water tank temperature Ts, for obtaining the leaving water temperature sensors of the leaving water temperature Tw of double-tube heat exchanger, for obtaining the fin temperature sensor of the fin temperature Tc of finned heat exchanger, and for obtaining the environment temperature sensor of environment temperature Th;
Described switching signal element comprises the cistern water level switch for detecting heat storage water tank water level upper and lower bound;
Described single chip control unit gathers source pump and ambient temperature signal by described temperature-sensing element, is gathered the on-off state signal of described source pump by described switching signal element; Produce the control signal of entering water electromagnetic valve and compressor, according to delivery temperature Tp, leaving water temperature Tw and water outlet temperature setting value Tws, calculate constant temperature flow valve aperture setting value, and produce constant temperature flow valve opening control signal, according to water tank temperature Ts and water outlet temperature setting value Tws, produce the control signal of constant temperature water pump, produce the control signal of by-passing valve according to leaving water temperature Tw;
Described single chip control unit exports driver element by described control signal, is connected to the compressor of a dual system heating type heat pump hot water group, entering water electromagnetic valve, constant temperature flow valve, by-passing valve and constant temperature water pump.
The one preferably technical scheme of a dual system of the present invention heating type heat pump hot water group, it is characterized in that described switching signal element also comprises low tension switch, high-voltage switch gear, hydraulic pressure switch, pressure differential detection valve, and heat pump A fault-signal and heat pump B fault-signal; Described single chip control unit gathers each on-off state signal of described switching signal element, judge the running status of heat pump A and heat pump B, produce dual system resultant fault signal, for adjusting the initial opening setting value of described constant temperature flow valve.
The better technical scheme of one of a dual system of the present invention heating type heat pump hot water group, is characterized in that, on the finned heat exchanger of described heat pump A and heat pump B, arranges two fin temperature sensors respectively; Described single chip control unit obtains the detected temperatures of two fin temperature sensors, using its mean value as fin temperature Tc; If when open circuit or short trouble appear in fin temperature sensor, then use temperature that another fin temperature sensor detects as fin temperature Tc; And environmentally temperature Th, water tank temperature Ts and fin temperature Tc, timing requirements according to defrost produces defrost control signal, export driver element via described control signal, be connected to the cross valve of heat-pump hot-water unit, control source pump and start or exit defrost running status.
The invention has the beneficial effects as follows:
1, the dual system unit of heat pump water-heating machine constant temperature flow control methods of the present invention and use the method, by arranging monolithic processor controlled constant temperature flow valve, discharge PID adjustment is carried out according to leaving water temperature, adjustable range is wide, control accurate, less scaling and blocking, by obfuscation identification, intelligentized control method, ensure under different operating mode, source pump can cause the demand rapidly the hot water of temperature, while security of system is stable, there is higher efficiency and heating capacity.
2, dual system of the present invention heating type heat pump hot water group adopts the method for computer program control, its constant temperature flow valve pid algorithm can according to the difference between leaving water temperature and design temperature, change the governing speed of constant temperature flow valve, reach and reach water outlet design temperature fast, system and stable in outlet water temperature can be ensured again; Its defrosting control method, can ensure that source pump can reasonably enter and exit defrost, and defrost thoroughly, efficiently.
3, heat pump water-heating machine constant temperature flow control methods of the present invention and use the dual system unit of the method, when can realize changing environment temperature, different initial opening controls, and when ensureing unit start, initial opening is close to the aperture of actual demand; Easily occur when solving low ambient temperature that condensation effect is bad, heating capacity is low, the problem of energy heterodyne, the easy superpressure ratio of compressor, at present water design temperature is recalled by low ambient temperature, improve the condensation effect of source pump, improve heating capacity and the efficiency of source pump, compressor not superpressure ratio operation can be ensured again.Meanwhile, by temperature-constant operation, ensure that water tank temperature reaches design temperature.
4, the dual system unit of heat pump water-heating machine constant temperature flow control methods of the present invention and use the method, by carrying out synthesization analyzing and processing to the fault occurred, when a system malfunctions in dual system is out of service, by lowering water outlet design temperature, ensure the discharge of source pump, improve heating capacity and the efficiency of condensation effect and unit, thus ensure that another does not have out of order system energy safety, stable, Effec-tive Function.
Accompanying drawing explanation
Fig. 1 is the structural representation using a dual system of the present invention heating type heat pump hot water group;
Fig. 2 is the theory diagram of the single chip control unit of the constant temperature flow regulator of constant temperature flow valve;
Fig. 3 is the external interface circuit figure that single chip control unit and control signal export driver element;
Fig. 4 is the constant temperature flow control methods flow chart of a dual system heating type heat pump hot water group;
Fig. 5 is the defrosting control flow chart of the constant temperature flow control methods of a dual system heating type heat pump hot water group.
The label of each parts in above figure: 1-compressor, 2-cross valve, 3-expansion valve, 4-finned heat exchanger, 5-gas-liquid separator, 6-low tension switch, 7-high-voltage switch gear, 8-hydraulic pressure switch, 9-pressure differential detection valve, 10-double-tube heat exchanger, 11-entering water electromagnetic valve, 12-constant temperature flow valve, 13-by-passing valve, 14-constant temperature water pump, 15-tap water inlets, 16-constant temperature water inlet, 17-constant-temperature effluent mouth, 20-single chip control unit, 21-temperature signal collection processing module, 22-switching signal acquisition processing module, 23-entering water electromagnetic valve control module, 24-source pump control module, 25-constant temperature flow valve aperture setting module, 26-constant temperature flow valve pid stream amount adjustment module, 27-thermostatic pump control module, 28-bypass valve control module, 29-defrost mode control module, 30-control signal exports driver element, A-heat pump A, B-heat pump B, C-is for water heating system.
Detailed description of the invention
In order to technique scheme of the present invention can be understood better, describe in detail further below in conjunction with drawings and Examples.
Fig. 1 is an embodiment of the dual system heating type heat pump hot water group using constant temperature flow regulator of the present invention, and described dual system heating type heat pump hot water group comprises heat pump A, heat pump B and confession water heating system C; Heat pump A and heat pump B comprises one group of compressor 1 respectively, cross valve 2, expansion valve 3, the air source heat pump that finned heat exchanger 4 and gas-liquid separator 5 connect to form; Double-tube heat exchanger 10 is comprised, entering water electromagnetic valve 11, constant temperature flow valve 12 and constant temperature water pump 14 for water heating system C; Tap water inlets 15 is connected to the cold water inlet of double-tube heat exchanger 10 successively by entering water electromagnetic valve 11 and constant temperature flow valve 12; Heat storage water tank (not shown), by constant temperature water inlet 16, is connected to the thermostatted water entrance of double-tube heat exchanger 10, and the thermostatted water outlet of double-tube heat exchanger 10 is connected to heat storage water tank by constant-temperature effluent mouth 17 again, forms thermostatted water closed circuit; By-passing valve 13 is connected in parallel at the two ends of constant temperature flow valve 12.
Fig. 2 and Fig. 3 illustrates an embodiment of the constant temperature flow regulator of a dual system of the present invention heating type heat pump hot water group, comprises single chip control unit 20, one group of temperature-sensing element, and one group of switching signal element and control signal export driver element 30;
Described temperature-sensing element comprises exhaust gas temperature sensor, for obtaining the delivery temperature Tp of compressor 1; Water tank temperature sensor, for obtaining water tank temperature Ts; Leaving water temperature sensors, for obtaining the leaving water temperature Tw of double-tube heat exchanger 10; Fin temperature sensor, for obtaining the fin temperature Tc of finned heat exchanger 4, and environment temperature sensor, for obtaining environment temperature Th;
Described switching signal element comprises the cistern water level switch for detecting heat storage water tank water level upper and lower bound, for the pressure switch signal of source pump overvoltage or under-voltage protection, and for controlling the control panel switch of unit operation; Fig. 1 and Fig. 2 eliminate temperature-sensing element and partial switch signal element and and control unit between line;
Single chip control unit 20 exports driver element 30 by control signal, is connected to the compressor 1 of a dual system heating type heat pump hot water group, entering water electromagnetic valve 11, constant temperature flow valve 12, by-passing valve 13 and constant temperature water pump 14;
An embodiment of single chip control unit 20 as shown in Figure 2, comprising:
Temperature signal collection processing module 21, for gathering source pump and environment temperature by described temperature-sensing element;
Switching signal acquisition processing module 22, for gathering the on-off state signal of source pump by described switching signal element;
Entering water electromagnetic valve control module 23 and source pump control module 24, be connected to the output of switching signal acquisition processing module 22, according to heat storage water tank water level upper and lower bound signal, according to the startup timing requirements of source pump, produce the control signal of entering water electromagnetic valve 11 and compressor 1;
Constant temperature flow valve aperture setting module 25 and constant temperature flow valve pid stream amount adjustment module 26, be connected to the output of temperature signal collection processing module 21, according to delivery temperature Tp, leaving water temperature Tw and water outlet temperature setting value Tws, calculate constant temperature flow valve aperture setting value, and produce constant temperature flow valve opening control signal;
Thermostatic pump control module 27, is connected to the output of temperature signal collection processing module 21, according to water tank temperature Ts and water outlet temperature setting value Tws, produces the control signal of constant temperature water pump 14;
Bypass valve control module 28, is connected to the output of temperature signal collection processing module 21, produces the control signal of by-passing valve 13 according to leaving water temperature Tw.
According to the embodiment of the dual system of the present invention heating type heat pump hot water group shown in Fig. 1 to Fig. 3, described switching signal element also comprises low tension switch 6, high-voltage switch gear 7, hydraulic pressure switch 8, pressure differential detection valve 9, and heat pump A fault-signal and heat pump B fault-signal; Single chip control unit 20 is by switching signal acquisition processing module 22, gather each on-off state signal of described switching signal element, judge the running status of heat pump A and heat pump B, produce dual system resultant fault signal, send constant temperature flow valve aperture setting module 25 to.
According to another embodiment of a dual system of the present invention heating type heat pump hot water group, on the heat pump A of a dual system heating type heat pump hot water group and the finned heat exchanger 4 of heat pump B, two fin temperature sensors are set respectively; Single chip control unit 20 also comprises defrosting control module 29; Temperature signal collection processing module 21 obtains the detected temperatures of two fin temperature sensors, using its mean value as fin temperature Tc; If when open circuit or short trouble appear in fin temperature sensor, then use temperature that another fin temperature sensor detects as fin temperature Tc; Defrosting control module 29 is connected to the output of temperature signal collection processing module 21, environmentally temperature Th, water tank temperature Ts and fin temperature Tc, timing requirements according to defrost produces defrost control signal, driver element 30 is exported via control signal, be connected to the cross valve 2 of heat-pump hot-water unit, control source pump and start or exit defrost running status.
According to an embodiment of a dual system of the present invention heating type heat pump hot water group, single chip control unit 20 and control signal export driver element 30 and are assembled in the housing of control device, form independently dual system heating type heat pump hot water group constant temperature flow regulator, described housing configures the Man Machine Interface 40 with keyboard & display panel, single chip control unit 20 performs setting and the monitoring of heat-pump hot-water unit by Man Machine Interface 40, such as, by input through keyboard water outlet temperature setting value Tws, by display floater display water temperature and operating states of the units.
According to another embodiment of a dual system of the present invention heating type heat pump hot water group, described single chip control unit 20 also comprises control bus interface module, such as, Modbus protocol bus interface module, constant temperature flow regulator is by control bus interface module, be connected to the master control system of a dual system heating type heat pump hot water group, realize centralized Control and remote monitoring function, such as, coolant-temperature gage setting value Tws is set out, display water temperature and operating states of the units by remote monitoring terminal.
Fig. 4 is the flow chart of heat pump water-heating machine constant temperature flow control methods of the present invention, the flow chart of the present embodiment only contains the basic step realizing constant temperature flow rate adjusting method, eliminate those skilled in the art the well-known routines step needed for process such as the microsystem computer software and hardware power-up initializing be familiar with.
The embodiment that use Single-chip Controlling of the present invention shown in Fig. 4 realizes the method for constant temperature Flow-rate adjustment comprises the following steps:
S100) coolant-temperature gage setting value Tws and water temperature return difference setting value Twd is read out;
S120) when environment temperature Th is lower than-5 DEG C, water outlet temperature setting value Tws is adjusted to 40 DEG C; Select temperature-constant operation mode of priority, ensure that water tank temperature Ts reaches design temperature; The present invention is by when low ambient temperature, lower water outlet temperature setting value Tws, improve the condensation effect of source pump, improve heating capacity and the efficiency of source pump, when solving low ambient temperature, easily occur that condensation effect is bad, heating capacity is low, the problem of energy heterodyne, the easy superpressure ratio of compressor.Meanwhile, by temperature-constant operation pattern, ensure that water tank temperature reaches water outlet temperature setting value.Thus the heating effect of the system of guarantee.
S140) judging the running status of heat pump A and heat pump B, when there is the fault that compressor can not open when there being a system in dual system, water outlet temperature setting value Tws being adjusted to 40 DEG C; The present invention gathers each on-off state signal of dual system source pump by switching signal acquisition processing module, judge the running status of heat pump A and heat pump B, produce dual system resultant fault signal, then comprehensive analysis processing result is carried out according to the fault occurred, at present coolant-temperature gage setting value Tws is recalled by breaking down at triangular web, ensure the discharge of source pump, improve heating capacity and the efficiency of condensation effect and unit, thus ensure that another does not have out of order system energy safety, stable, Effec-tive Function.
S160) temperature of each temperature-sensing element is detected in real time by temperature signal collection processing module; The on off state of each switching signal is detected in real time by switching signal acquisition processing module;
S180) prescribe a time limit under heat storage water tank water level is lower than water level, according to the startup timing requirements of source pump, open entering water electromagnetic valve, make constant temperature flow valve be opened to initial opening, unit starting once heats operational mode.Source pump starts the embodiment once heating the Control timing sequence of operational mode: entering water electromagnetic valve is opened, time delay 3 seconds, and constant temperature flow valve is opened to initial opening, and within 10 seconds, rear fan, compressor are opened, and in 60 seconds, constant temperature flow valve initial opening remains unchanged.
S200) prescribe a time limit under water level is lower than water level, open entering water electromagnetic valve, start compressor, unit enters and once heats operational mode S300;
S300) once operational mode is heated: call constant temperature flow valve pid algorithm, with water outlet temperature setting value Tws for desired value, control constant temperature flow valve aperture according to leaving water temperature detected value Tw, regulating water flow, makes leaving water temperature Tw and water outlet temperature setting value Tws be consistent;
S380) when the water level of storage tank reaches designated water level, unit is out of service;
When S400) reducing because of heat radiation as water tank temperature Ts, open constant temperature water pump, compressor, unit enters temperature-constant operation Mode S 420;
S420) temperature-constant operation pattern: when water tank temperature Ts is lower than water outlet temperature setting value Tw-water temperature return difference setting value Twd, open constant temperature water pump, compressor, unit carries out temperature-constant operation, after water tank temperature Ts reaches water outlet temperature setting value Tws, unit exits temperature-constant operation pattern, turns to step S380;
S500) when inflow temperature is too high, when leaving water temperature Tw exceeds the adjustable range of constant temperature flow valve, by-passing valve is opened; After in the adjustable range that leaving water temperature is reduced to constant temperature flow valve, close by-passing valve.Embodiments of the invention according to Fig. 4, the preferred adjustable range of constant temperature flow valve is 65 DEG C≤Tw≤55 DEG C, that is, when leaving water temperature Tw is more than 65 DEG C, open by-passing valve, increase unit flow of inlet water, thus reduce leaving water temperature Tw, improve the efficiency of source pump, when leaving water temperature Tw is reduced to 55 DEG C, close by-passing valve.
The embodiment of the heat pump water-heating machine constant temperature flow control methods according to Fig. 4, the constant temperature flow valve pid algorithm described in step S300 comprises the following steps:
S320) according to leaving water temperature Tw and delivery temperature Tp, according to following condition determination delivery temperature correction value Δ Tp:
If Tp > is Tw+50, Δ Tp=5;
If Tw+20≤Tp≤Tw+50, Δ Tp=0;
If Tp < is Tw+20, Δ Tp=-3;
S340) according to formula
△T＝(Tw-Tws)+ΔTp；
Ks＝S*△T；
Determine constant temperature flow valve aperture Ks; Wherein, Tw is leaving water temperature detected value, and Tws is water outlet temperature setting value, and Tp is delivery temperature, and Δ Tp is delivery temperature correction value, and Ks is constant temperature flow valve aperture, and S is governing speed coefficient, S=10 ~ 20.
Step S340 is according to the difference between leaving water temperature Tw and water outlet temperature setting value Tws, and change the governing speed of constant temperature flow valve, wherein, governing speed coefficient S is determined according to following condition:
As 5 < △ T, S=20;
When-5≤△ T≤5, S=10;
When △ T <-5, S=20.
In the heat pump water-heating machine constant temperature flow control methods provided by the invention shown in Fig. 4, also comprise constant temperature mode of priority and once heat running priority mode selecting step:
S200) if select temperature-constant operation mode of priority, then regardless of the water level of water tank, as long as water tank temperature Ts is lower than water outlet temperature setting value Tws-water temperature return difference Twd, unit proceeds to temperature-constant operation pattern immediately;
S220) once heat running priority pattern if select, no matter then water tank temperature Ts is how many, as long as water level is lower than water level lower limit, unit proceeds to immediately and once heats operational mode.
According to another embodiment of heat pump water-heating machine constant temperature flow control methods of the present invention, also comprise the process of the defrost running status control producing defrost clock signal, to ensure that dual system heat-pump hot-water unit reasonably can start and exit defrost running status, and defrost thoroughly, efficiently.Defrost running status control procedure as shown in Figure 5, comprises the following steps:
S600) arrange two fin temperature sensors respectively in each system of a dual system heating type heat pump hot water group, the detected temperatures mean value of foundation two fin temperature sensors, as fin temperature Tc, determines that defrost starts and exits temperature; When open circuit or short trouble appear in fin temperature sensor, use temperature that another fin temperature sensor detects as fin temperature Tc, determine defrost startup and exit temperature;
S620) defrost entry condition:
As environment temperature Th > 15 DEG C, unit does not enter defrost;
When 7 DEG C of < environment temperature Th≤15 DEG C,
During water tank temperature Ts > 45 DEG C, unit does not enter defrost;
During water tank temperature Ts≤45 DEG C, run after 90 minutes, if fin temperature Tc continues to reach 5 minutes lower than 0 DEG C, then unit enters defrost;
When-2 DEG C of < environment temperature Th≤7 DEG C, run after 40 minutes, if fin temperature Tc continues to reach 5 minutes lower than-4 DEG C, then unit enters defrost;
When environment temperature Th≤-2 DEG C, run after 30 minutes, if fin temperature Tc continues to reach 5 minutes lower than Th-3 DEG C, then unit enters defrost;
If environment temperature Th <-2 DEG C and continue 120 minutes, unit does not also reach except defrost entry condition, then unit force enter defrost.
S640) defrost exit criteria:
Time within 3 minutes defrost time, if fin temperature Tc reaches 6 DEG C, then exit defrost;
When the defrost time is after 3 minutes, if fin temperature Tc reaches 12 DEG C, then exit defrost;
10 minutes are reached, then compulsory withdrawal defrost when the defrost time.
Those of ordinary skill in the art will be appreciated that; above embodiment is only used to technical scheme of the present invention is described; and be not used as limitation of the invention; any the above embodiment is done based on connotation of the present invention change, modification, all will drop in the protection domain of claim of the present invention.
Claims (10)
1. a heat pump water-heating machine constant temperature flow control methods, for monolithic processor controlled dual system heating type heat pump hot water group, is characterized in that comprising the following steps:
S100) coolant-temperature gage setting value and water temperature return difference setting value is read out;
S160) temperature of each temperature-sensing element is detected in real time by temperature signal collection processing module; The on off state of each switching signal is detected in real time by switching signal acquisition processing module;
S180) prescribe a time limit under heat storage water tank water level is lower than water level, according to the startup timing requirements of source pump, open entering water electromagnetic valve, make constant temperature flow valve be opened to initial opening, unit starting once heats operational mode;
S200) prescribe a time limit under water level is lower than water level, open entering water electromagnetic valve, start compressor, unit enters and once heats operational mode S300;
S300) once heat operational mode: call constant temperature flow valve pid algorithm, with water outlet temperature setting value for desired value, control constant temperature flow valve aperture according to leaving water temperature detected value, regulating water flow, makes leaving water temperature and water outlet temperature setting value be consistent;
S380) when the water level of storage tank reaches designated water level, unit is out of service;
When S400) reducing because of heat radiation when water tank temperature, open constant temperature water pump, compressor, unit enters temperature-constant operation Mode S 420;
S420) temperature-constant operation pattern: when water tank temperature is lower than water outlet temperature setting value-water temperature return difference setting value, open constant temperature water pump, compressor, unit carries out temperature-constant operation, and after water tank temperature reaches water outlet temperature setting value, unit exits temperature-constant operation pattern;
S500) when inflow temperature is too high, when leaving water temperature exceeds the adjustable range of constant temperature flow valve, by-passing valve is opened; After in the adjustable range that leaving water temperature is reduced to constant temperature flow valve, close by-passing valve.
2. heat pump water-heating machine constant temperature flow control methods according to claim 1, is characterized in that the constant temperature flow valve pid algorithm described in step S300 comprises the following steps:
S320) according to leaving water temperature and delivery temperature, according to following condition determination delivery temperature correction value:
If Tp > is Tw+50, Δ Tp=5;
If Tw+20≤Tp≤Tw+50, Δ Tp=0;
If Tp < is Tw+20, Δ Tp=-3;
S340) according to formula
△T＝(Tw-Tws)+ΔTp；
Ks＝S×△T；
Determine constant temperature flow valve aperture Ks; Wherein, Tw is leaving water temperature detected value, and Tws is water outlet temperature setting value, and Tp is delivery temperature, and Δ Tp is delivery temperature correction value, and Ks is constant temperature flow valve aperture, and S is governing speed coefficient, S=10 ~ 20.
3. heat pump water-heating machine constant temperature flow control methods according to claim 2, it is characterized in that step S340 is according to the difference between leaving water temperature and water outlet temperature setting value, change the governing speed of constant temperature flow valve, wherein, governing speed coefficient S is determined according to following condition:
As 5 < △ T, S=20;
When-5≤△ T≤5, S=10;
When △ T <-5, S=20.
4. the heat pump water-heating machine constant temperature flow control methods according to claim 1,2 or 3, characterized by further comprising constant temperature mode of priority and once heats running priority mode selecting step:
S200) if select temperature-constant operation mode of priority, then regardless of the water level of water tank, as long as water tank temperature is lower than water outlet temperature setting value-water temperature return difference, unit proceeds to temperature-constant operation pattern immediately;
S220) once heat running priority pattern if select, no matter then water tank temperature is how many, as long as water level is lower than water level lower limit, unit proceeds to immediately and once heats operational mode.
5. the heat pump water-heating machine constant temperature flow control methods according to claim 1,2 or 3, characterized by further comprising the thermostatically controlled step of low ambient temperature:
S120) when environment temperature is lower than-5 DEG C, water outlet temperature setting value is adjusted to 40 DEG C; Select temperature-constant operation mode of priority, ensure that water tank temperature reaches design temperature.
6. the heat pump water-heating machine constant temperature flow control methods according to claim 1,2 or 3, characterized by further comprising dual system resultant fault state rate-determining steps:
S140) judging the running status of heat pump A and heat pump B, when there is the fault that compressor can not open when there being a system in dual system, water outlet temperature setting value being adjusted to 40 DEG C.
7. the heat pump water-heating machine constant temperature flow control methods according to claim 1,2 or 3, characterized by further comprising the process that defrost running status controls, described defrost running status control procedure comprises the following steps:
S600) arrange two fin temperature sensors respectively in each system of a dual system heating type heat pump hot water group, the detected temperatures mean value of foundation two fin temperature sensors, as fin temperature, determines that defrost starts and exits temperature; When open circuit or short trouble appear in fin temperature sensor, use temperature that another fin temperature sensor detects as fin temperature, determine defrost startup and exit temperature;
S620) defrost entry condition:
As environment temperature > 15 DEG C, unit does not enter defrost;
When 7 DEG C of < environment temperature≤15 DEG C,
During water tank temperature > 45 DEG C, unit does not enter defrost;
During water tank temperature≤45 DEG C, run after 90 minutes, if fin constant temperature reaches 5 minutes lower than 0 DEG C, then unit enters defrost;
When-2 DEG C of < environment temperature≤7 DEG C, run after 40 minutes, if fin constant temperature reaches 5 minutes lower than-4 DEG C, then unit enters defrost;
When environment temperature≤-2 DEG C, run after 30 minutes, if fin temperature Tc continues to reach 5 minutes lower than environment temperature-3 DEG C, then unit enters defrost;
If environment temperature <-2 DEG C and continue 120 minutes, unit does not also reach except defrost entry condition, then unit force enter defrost;
S640) defrost exit criteria:
Time within 3 minutes defrost time, if fin temperature reaches 6 DEG C, then exit defrost;
When the defrost time is after 3 minutes, if fin temperature reaches 12 DEG C, then exit defrost;
10 minutes are reached, then compulsory withdrawal defrost when the defrost time.
8. use dual system heating type heat pump hot water group of the heat pump water-heating machine constant temperature flow control methods of arbitrary claim of claim 1 to 7, comprise heat pump A, heat pump B, for water heating system C and constant temperature volume control device; Heat pump A and heat pump B comprises one group of compressor respectively, cross valve, expansion valve, and the air source heat pump that finned heat exchanger and gas-liquid separator connect to form is characterized in that:
Described comprises double-tube heat exchanger, entering water electromagnetic valve, constant temperature flow valve and constant temperature water pump for water heating system C; Tap water inlets is connected to the cold water inlet of described double-tube heat exchanger successively by described entering water electromagnetic valve and constant temperature flow valve; Heat storage water tank is connected to the thermostatted water entrance of described double-tube heat exchanger by constant temperature water inlet, and the thermostatted water outlet of described double-tube heat exchanger is connected to described heat storage water tank by constant-temperature effluent mouth again, forms thermostatted water closed circuit; By-passing valve is connected in parallel at the two ends of described constant temperature flow valve;
Described constant temperature volume control device comprises single chip control unit, one group of temperature-sensing element, and one group of switching signal element and control signal export driver element;
Described temperature-sensing element comprises the exhaust gas temperature sensor of the delivery temperature for obtaining compressor, for obtaining the water tank temperature sensor of water tank temperature, for obtaining the leaving water temperature sensors of the leaving water temperature of double-tube heat exchanger, for obtaining the fin temperature sensor of the fin temperature of finned heat exchanger, and for obtaining the environment temperature sensor of environment temperature;
Described switching signal element comprises the cistern water level switch for detecting heat storage water tank water level upper and lower bound;
Described single chip control unit gathers source pump and ambient temperature signal by described temperature-sensing element, is gathered the on-off state signal of described source pump by described switching signal element; Produce the control signal of entering water electromagnetic valve and compressor, according to delivery temperature, leaving water temperature and water outlet temperature setting value, calculate constant temperature flow valve aperture setting value, and produce constant temperature flow valve opening control signal, according to water tank temperature and water outlet temperature setting value, produce the control signal of constant temperature water pump, produce the control signal of by-passing valve according to leaving water temperature;
Described single chip control unit exports driver element by described control signal, is connected to the compressor of a dual system heating type heat pump hot water group, entering water electromagnetic valve, constant temperature flow valve, by-passing valve and constant temperature water pump.
9. dual system according to claim 8 heating type heat pump hot water group, it is characterized in that described switching signal element also comprises low tension switch, high-voltage switch gear, hydraulic pressure switch, pressure differential detection valve, and heat pump A fault-signal and heat pump B fault-signal; Described single chip control unit gathers each on-off state signal of described switching signal element, judge the running status of heat pump A and heat pump B, produce dual system resultant fault signal, for adjusting the initial opening setting value of described constant temperature flow valve.
10. dual system according to claim 8 heating type heat pump hot water group, is characterized in that, on the finned heat exchanger of described heat pump A and heat pump B, arranges two fin temperature sensors respectively; Described single chip control unit obtains the detected temperatures of two fin temperature sensors, using its mean value as fin temperature; If when open circuit or short trouble appear in fin temperature sensor, then use temperature that another fin temperature sensor detects as fin temperature; And environmentally temperature, water tank temperature and fin temperature, timing requirements according to defrost produces defrost control signal, export driver element via described control signal, be connected to the cross valve of heat-pump hot-water unit, control source pump and start or exit defrost running status.
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| CN104748391B (en) * | 2013-12-26 | 2017-08-04 | 珠海格力电器股份有限公司 | The control circuit and control system of a kind of heat pump water-heating machine |
| CN104534679B (en) * | 2014-12-09 | 2017-06-06 | 合肥美的暖通设备有限公司 | Heat pump water-heating machine and the temperature control method of water and device for heat pump water-heating machine |
| CN106322768B (en) * | 2015-06-25 | 2020-04-28 | 青岛海尔智能技术研发有限公司 | Water heater and control method thereof |
| CN106369834A (en) * | 2016-09-02 | 2017-02-01 | 南通大学 | Directly-heated type heat pump system constant-temperature flow control method based on neural network |
| CN108266898B (en) * | 2016-12-30 | 2020-12-22 | 青岛海尔新能源电器有限公司 | Defrosting control method and system for air energy water heater |
| CN108895662B (en) * | 2018-06-12 | 2021-02-09 | 合肥美的暖通设备有限公司 | Water heater, control method and device thereof and readable storage medium |
| CN109405347B (en) * | 2018-12-05 | 2021-08-06 | 江苏天舒电器有限公司 | Control method of multi-stage heat utilization heat pump control system for bathroom |
| CN109764406A (en) * | 2019-01-17 | 2019-05-17 | 南京索热电子科技有限公司 | A kind of heat-exchange system and its implementation with PID constant temperature algorithm |
| CN110056938A (en) * | 2019-04-15 | 2019-07-26 | 江苏迈能高科技有限公司 | A kind of integrated return water heat-exchanging water tank and its control method |
| CN112443934B (en) * | 2019-09-05 | 2021-11-02 | 青岛海尔空调电子有限公司 | Total heat recovery defrosting control method, control system and air conditioning device |
| CN113669968A (en) * | 2021-08-13 | 2021-11-19 | 广东纽恩泰新能源科技发展有限公司 | Energy regulation control method for variable-frequency compressor of air-source heat pump |
| CN113899073A (en) * | 2021-10-29 | 2022-01-07 | 四川虹美智能科技有限公司 | Control system and method for circulating water pump of hot water unit |
| CN114165828A (en) * | 2021-12-01 | 2022-03-11 | 青岛海信日立空调系统有限公司 | Air conditioning system |
| CN115143646B (en) * | 2022-06-16 | 2023-06-27 | 浙江科技学院 | Intelligent hot water control device and control method |
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| US6445880B1 (en) * | 2001-06-01 | 2002-09-03 | Aerco International, Inc. | Water heating system with automatic temperature control |
| CN200965352Y (en) * | 2006-08-03 | 2007-10-24 | 上海交通大学 | Auxiliary electric heater for heat pump hot water system |
| CN101514844A (en) * | 2008-12-09 | 2009-08-26 | 苏州市南极风能源设备有限公司 | Air energy medium-high temperature heat pump water heater |
| CN201497185U (en) * | 2009-09-15 | 2010-06-02 | 高秀明 | Commercial waste heat recovering heat pump water heater |
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