CN113324333A - Heat pump water heater start-stop control method based on water tank heat energy consumption - Google Patents

Heat pump water heater start-stop control method based on water tank heat energy consumption Download PDF

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CN113324333A
CN113324333A CN202110576780.4A CN202110576780A CN113324333A CN 113324333 A CN113324333 A CN 113324333A CN 202110576780 A CN202110576780 A CN 202110576780A CN 113324333 A CN113324333 A CN 113324333A
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water tank
water
heat energy
heat
temperature
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CN113324333B (en
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毛萌节
梁晓恩
莫顺权
陈少欢
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Guangdong Fenni Electrical Technology Co ltd
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Guangdong Fenni Electrical Technology Co ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00Fluid heaters characterised by the use of heat pumps
    • F24H4/02Water heaters
    • F24H4/04Storage heaters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00Details
    • F24H9/20Arrangement or mounting of control or safety devices
    • F24H9/2007Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
    • F24H9/2021Storage heaters
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention relates to a heat pump water heater start-stop control method based on water tank heat energy consumption, which comprises the following steps: step S1, recording a group of input parameters at preset time intervals; step S2, calculating rated heat energy W of water tankRated value(ii) a Step S3, calculating the actual heat energy W of the water tankPractice of(ii) a Step S4, calculating the heat energy W consumed by the user after the constant temperature shutdownn,m(ii) a Step S5, according to the heat energy W consumed by the user after the constant temperature shutdownn,mAnd the heat leakage quantity Q of the water tank when the unit is in standbyLeakage netOr according to the actual heat energy W of the water tankPractice ofAnd rated heat energy W of water tankRated valueJudging whether the water tank is started for heating or not; step S6, according to the heat energy W provided by the heat pumpHeat pumpHeat energy W provided by electric heatingElectric heatingAnd the heat leakage quantity Q' of the water tank during the operation of the unitLeakage netAnd judging whether to stop heating the water tank. The invention solves the problems of overhigh actual outlet water temperature and insufficient hot water, and providesThe life experience of the user is improved.

Description

Heat pump water heater start-stop control method based on water tank heat energy consumption
Technical Field
The invention relates to the technical field of water heater control, in particular to a heat pump water heater start-stop control method based on water tank heat energy consumption.
Background
At present, water in a water heater is heated through a heat pump system and an electric heating pipe, the start and stop of the heat pump system and the electric heating are controlled by judging the difference value of water temperature and target water temperature through a thermistor arranged on a water tank in a traditional mode, most of the heat pump water heater is controlled by a single temperature sensing head or a double temperature sensing head, and the least of the heat pump water heater is controlled by a three temperature sensing head. The number of the temperature sensing heads determines the accuracy of water temperature value, thereby leading to the rationality of hot water heating start-stop control.
The outward-wound coil pipe used by the heat pump water heater surrounds the outer wall of the water tank from top to bottom, and when the heat pump is started for heating, a high-temperature refrigerant firstly passes through the upper part of the water tank and finally comes out from the lower part of the water tank. Therefore, the heat pump system is easy to cause the water tank temperature to form uneven water temperature stratification in the heating process. In addition, when a user uses water, cold water enters from the lower part of the water tank, and hot water comes out from the upper part of the water tank, so that the temperature difference of water temperature stratification is aggravated.
In the start-stop control of the hot water heating system, because water is repeatedly recycled and heated, the water tank is easy to form water temperature stratification with uneven upper and lower water temperatures. In order to completely detect the actual state of the layered water tank, a plurality of temperature sensing heads are needed to obtain the actual temperature, but due to the limitations of cost and structure, the heat pump water heater product generally cannot use more than three temperature sensing heads.
Because the use quantity of temperature-sensing head is limited, the heating scheme of temperature-sensing head control often leads to two problems easily, one is that upper portion hot water temperature is too high, and the hot water temperature that the user used in fact exceeds the hot water problem of settlement greatly, and the second is for controlling the too high temperature of upper portion, has delayed opening of hot water heating system, makes the water tank lower part remain too much cold water, and when the user next time used water, hot water was not enough.
Disclosure of Invention
The invention aims to at least solve the technical problems of overhigh actual outlet water temperature and insufficient hot water in the prior art. Therefore, the invention provides a control method capable of reasonably controlling the starting and the stopping of the heating system of the heat pump water heater based on the heat energy consumption of the water tank.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the heat pump water heater starting and stopping control method based on the water tank heat energy consumption comprises the following steps:
step S1, recording a group of water tank inlet flow L01, ambient temperature T01, water tank lower temperature T02, water tank upper temperature T03, water tank inlet temperature T04 and hot water set temperature R01 data as input parameters at intervals of preset time according to a water inlet flow meter, an ambient temperature sensing head, a water tank lower temperature sensing head, a water tank upper temperature sensing head and a hot water set temperature set by a user; wherein, the rated inlet water temperature T05 of the water tank is converted according to the environmental temperature T01;
step S2, calculating the rated heat energy W of the water outlet tank according to the set hot water temperature R01 and the rated inlet water temperature T05 set by the userRated value
Step S3, calculating the actual heat energy W of the water tank according to the actual integrated water temperature AVE (T) of the water tank and the rated inlet water temperature T05 of the water tankPractice of
Step S4, according to the average inlet water temperature
Figure BDA0003084687870000021
Average water tank inlet volume
Figure BDA0003084687870000022
Calculating average user consumed thermal energy
Figure BDA0003084687870000023
Based on average user consumed heat energy
Figure BDA0003084687870000024
Calculating the heat energy W consumed by the user after the constant temperature shutdownn,m
Step S5, according to the heat energy W consumed by the user after the constant temperature shutdownn,mAnd the heat leakage quantity Q of the water tank when the unit is in standbyLeakage netOr according to the actual heat energy W of the water tankPractice ofAnd rated heat energy W of water tankRated valueAnd judging whether to start the water tank for heating, wherein the specific judgment is as follows:
when the heat energy lost by the water tank after the constant temperature shutdown is more than or equal to the rated heat energy of the water tank multiplied by the heat energy sensitivity Q0And when 3, namely: wn,m+QLeakage net≥Q03×WRated valueStarting the water tank for heating;
when the actual heat energy W of the water tankPractice of≤(1-Q03-0.1)×WRated valueWhen the water tank is started to heat;
step S6, according to the heat energy W provided by the heat pumpHeat pumpHeat energy W provided by electric heatingElectric heatingAnd the heat leakage quantity Q' of the water tank during the operation of the unitLeakage netJudging whether to stop heating the water tank, and concretely judging as follows:
when the heat energy provided by the heat pump and the heat energy provided by the electric heating-the heat energy leaked by the water tank during the operation of the unit is larger than or equal to the heat energy consumed by a user after the constant-temperature shutdown, the method comprises the following steps: wHeat pump+WElectric heating-QˊLeakage net≥Wn,mAnd closing the water tank for heating.
In a preferred embodiment of the method for controlling start and stop of the heat pump water heater based on the heat energy consumption of the water tank provided by the present invention, in the step S2, the rated heat energy W of the water tank isRated value=CWater (W)×VWater tankX (R01-T05). times.1000, Unit: j;
wherein, CWater (W)The mass constant pressure heat capacity [ kJ/(kg. times. degree. C.) of water]A value of 4.187; vWater tankIs the rated volume of the water tank.
In a preferred embodiment of the method for controlling start and stop of the heat pump water heater based on the heat energy consumption of the water tank provided by the present invention, in the step S3, the actual heat energy W of the water tank isPractice of=CWater (W)×VWater tank×[AVE(T)-T05]X 1000, unit: j;
integrated water temperature ave (T) ═ 0.4 × T03+0.6 × T02, unit: DEG C.
In a preferred embodiment of the method for controlling starting and stopping of the heat pump water heater based on the heat energy consumption of the water tank, in the step S4, the average heat energy consumed by the user
Figure BDA0003084687870000034
The calculation method of (c) is as follows:
Figure BDA0003084687870000031
the unit is: j. the design is a square
Average inlet water temperature
Figure BDA0003084687870000032
After the water inlet flowmeter is started, taking an average value every 5s by a water inlet temperature sensing head of the water tank;
average water tank inlet volume
Figure BDA0003084687870000033
After the water inlet flow meter is started, taking an average number every 5s by the water inlet flow meter;
recording the number of times every 5s after the water inlet flowmeter is started, resetting after each constant-temperature shutdown, resetting again until the next constant-temperature shutdown, and setting the average counting number of times of the water inlet flowmeter after the constant-temperature shutdown as m;
and recording the number of times every 5s after the water inlet flow meter is started, never resetting, and setting the average counting number of the water inlet flow meter as n.
In a preferred embodiment of the method for controlling start and stop of the heat pump water heater based on the heat energy consumption of the water tank, in step S4, the heat energy W consumed by the user after the constant temperature shutdown is performedn,mThe calculation method of (c) is as follows:
Figure BDA0003084687870000041
unit: J.
in a preferred embodiment of the method for controlling start and stop of the heat pump water heater based on the heat energy consumption of the water tank provided by the present invention, in the step S5, the heat leakage Q of the water tank is generated when the unit is in standby stateLeakage net=PHeat leakage×hStandbyThe unit: KW/h; pHeat leakage=CWater (W)×VWater tank×THeat leakage3600 ÷ 24, unit: KW;
Theat leakageCompensating for temperature for heat leakage; h isStandbyResetting the machine set before the machine set is stopped every time for the standby time after the machine set is stopped, and stopping counting after the machine set is started;
q03 is the heat energy sensitivity, and the rated value range is 0.3-0.5.
In a preferred embodiment of the start-stop control method for the heat pump water heater based on the water tank heat energy consumption provided by the present invention, in the step S6, the heat leakage Q' of the water tank is generated when the unit is runningLeakage net=PHeat leakage×hOperation ofThe unit: KW/h;
hoperation ofIs hHeat pump/hElectric heatingTaking a larger value, resetting the running time of the unit after the unit is started, and stopping counting after the unit is stopped;
heat energy W provided by the heat pumpHeat pump=Q01×(hHeat pump-hDefrosting);
Q01 is the heating capacity of the heat pump, Q01 is K multiplied by Q, K is the attenuation coefficient of the performance of the heat pump, and Q is the heating capacity of the heat pump under all working conditions;
hheat pumpAccumulating time for single operation of the compressor, resetting the compressor before starting each time, and stopping counting after the compressor is closed;
hdefrostingAnd resetting before defrosting is started each time for the running time of the compressor after defrosting is started, and stopping counting after defrosting is closed.
Heat energy W provided by the electric heatingElectric heating=Pd×hElectric heating
PdHeating quantity for electric heating;
helectric heatingAccumulating time for single operation of electric heating, resetting before the electric heating is started every time, and stopping counting after the electric heating is closed.
Compared with the prior art, the heat pump water heater start-stop control method based on the water tank heat energy consumption has the beneficial effects that: the control method of the invention is adopted to control the start and stop of the heat pump water heater, solves the problems of overhigh actual outlet water temperature and insufficient hot water, and improves the life experience of users.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The invention provides a heat pump water heater start-stop control method based on water tank heat energy consumption, which comprises the following steps of:
step S1, recording a group of water tank inlet flow L01, ambient temperature T01, water tank lower temperature T02, water tank upper temperature T03, water tank inlet temperature T04 and hot water set temperature R01 data as input parameters at intervals of preset time according to a water inlet flow meter, an ambient temperature sensing head, a water tank lower temperature sensing head, a water tank upper temperature sensing head and a hot water set temperature set by a user; wherein, the rated inlet water temperature T05 of the water tank is converted according to the environmental temperature T01;
because the temperature of the water inlet temperature sensing head of the water tank can be changed in the heating process of the water tank, the deviation is caused in the calculation of the heat energy of the water tank, the rated inlet water temperature T05 of the water tank is used for calculating the heat energy of the water tank, and the relation between T05 and the ambient temperature T01 is as follows:
Figure BDA0003084687870000061
from the above table, it can be seen that: the rated water inlet temperature T05 of the water tank can be correspondingly obtained according to different ambient temperatures T01.
Step S2, calculating the rated heat energy W of the water outlet tank according to the set hot water temperature R01 and the rated inlet water temperature T05 set by the userRated value(ii) a Specifically, the rated heat energy W of the water tank of the embodimentRated value=CWater (W)×VWater tankX (R01-T05). times.1000, Unit: j; wherein, CWater (W)The mass constant pressure heat capacity [ kJ/(kg. times. degree. C.) of water]4.187, which is a constant value; vWater tankThe rated volume of the water tank is determined according to the design parameters of the water tank.
Step S3, calculating the actual heat energy W of the water tank according to the actual integrated water temperature AVE (T) of the water tank and the rated inlet water temperature T05 of the water tankPractice of(ii) a In particularThe actual heat energy W of the water tank of this embodimentPractice of=CWater (W)×VWater tank×[AVE(T)-T05]X 1000, unit: j; wherein, the integrated water temperature ave (T) ═ 0.4 × T03+0.6 × T02, unit: DEG C.
Step S4, according to the average inlet water temperature
Figure BDA0003084687870000071
Average water tank inlet volume
Figure BDA0003084687870000072
Calculating average user consumed thermal energy
Figure BDA0003084687870000073
Based on average user consumed heat energy
Figure BDA0003084687870000074
Calculating the heat energy W consumed by the user after the constant temperature shutdownn,m
Specifically, the average user consumption heat energy of the embodiment
Figure BDA0003084687870000075
The calculation method of (c) is as follows:
Figure BDA0003084687870000076
the unit is: j. the design is a square
Average inlet water temperature
Figure BDA0003084687870000077
After the water inlet flowmeter is started, taking an average value every 5s by a water inlet temperature sensing head of the water tank;
average water tank inlet volume
Figure BDA0003084687870000078
After the water inlet flow meter is started, taking an average number every 5s by the water inlet flow meter;
recording the number of times every 5s after the water inlet flowmeter is started, resetting after each constant-temperature shutdown, resetting again until the next constant-temperature shutdown, and setting the average counting number of times of the water inlet flowmeter after the constant-temperature shutdown as m;
and recording the number of times every 5s after the water inlet flow meter is started, never resetting, and setting the average counting number of the water inlet flow meter as n. Specifically, the heat energy W consumed by the user after the constant temperature shutdown is performed in the embodimentn,mThe calculation method of (c) is as follows:
Figure BDA0003084687870000079
unit: J.
step S5, according to the heat energy W consumed by the user after the constant temperature shutdownn,mAnd the heat leakage quantity Q of the water tank when the unit is in standbyLeakage netOr according to the actual heat energy W of the water tankPractice ofAnd rated heat energy W of water tankRated valueAnd judging whether to start the water tank for heating, wherein the specific judgment is as follows:
when the heat energy lost by the water tank after the constant-temperature shutdown is more than or equal to the rated heat energy of the water tank multiplied by the heat energy sensitivity Q03, namely: wn,m+QLeakage net≥Q03×WRated valueStarting the water tank for heating;
when the unit is in standby state, the heat leakage quantity Q of the water tankLeakage net=PHeat leakage×hStandbyThe unit: KW/h; pHeat leakage=CWater (W)×VWater tank×THeat leakage3600 ÷ 24, unit: KW;
Theat leakageCompensating for temperature for heat leakage; h isStandbyResetting the machine set before the machine set is stopped every time for the standby time after the machine set is stopped, and stopping counting after the machine set is started;
specifically, the heat leakage compensation temperature T of the present embodimentHeat leakage(the water tank has a heat leakage phenomenon in itself for calculating the heat energy loss) as follows:
volume interval V of water tankWater tank(L) The water temperature drop value T is 24 hours laterHeat leakage(℃)
[25,50] 12.5
(50,75] 10.8
(75,100] 9.5
(100,150] 8.5
(150,200] 7.5
(200,250] 7
(250,300] 6.5
(300,400] 5.5
>400 5
When the actual heat energy W of the water tankPractice of≤(1-Q03-0.1)×WRated valueWhen the water tank is started to heat, the situation is generally caused by that a user changes the set temperature R01 of hot water, or the error is accumulated for a long time;
q03 is heat energy sensitivity, and the rated value range is 0.3 ~ 0.5, and this embodiment can take 0.3, specifically adjusts according to user's use habit.
Step S6, according to the heat energy W provided by the heat pumpHeat pumpHeat energy W provided by electric heatingElectric heatingAnd the heat leakage quantity Q' of the water tank during the operation of the unitLeakage netJudging whether to stop heating the water tank, and concretely judging as follows:
when the heat energy provided by the heat pump and the heat energy provided by the electric heating-the heat energy leaked by the water tank during the operation of the unit is larger than or equal to the heat energy consumed by a user after the constant-temperature shutdown, the method comprises the following steps: wHeat pump+WElectric heating-QˊLeakage net≥Wn,mAnd closing the water tank for heating.
Heat leakage quantity Q' of water tank during operation of unitLeakage net=PHeat leakage×hOperation ofThe unit: KW/h;
hoperation ofIs hHeat pump/hElectric heatingTaking a larger value, resetting the running time of the unit after the unit is started, and stopping counting after the unit is stopped;
heat energy W provided by the heat pumpHeat pump=Q01×(hHeat pump-hDefrosting);
Q01 is the heating capacity of the heat pump, Q01 is K multiplied by Q, K is the attenuation coefficient of the performance of the heat pump, and Q is the heating capacity of the heat pump under all working conditions;
wherein, the heat pump performance attenuation coefficient is calculated as the following table (considering the energy efficiency attenuation of the heat pump system under long-term operation):
determination conditions Value of K
When O08 ÷ (8X 365X 5) < 1 K=1-0.3×O08÷(8×365×5)
When O08/2 (8X 365X 5) ≧ 1 K=0.7
When the system leaks fluorine K=0.3
When the heat pump system fails to start K=0
The heating capacity Q of the heat pump under all operating conditions is calculated as follows:
Figure BDA0003084687870000091
in the above table: q7The minimum operating mode heating capacity (7/6) in kW, measured by a laboratory;
Q-7the heating capacity is (-7/-8) under the low-temperature operation condition, unit kW is measured by a laboratory;
Q2heating capacity (2/1) in kW for automatic defrosting conditions, measured by a laboratory;
q20 is nominal operating mode heating capacity (20/15) in kW, measured by a laboratory;
q27 is the heating capacity under high temperature (27/19) in kW, measured by laboratory;
hheat pumpAccumulating time for single operation of the compressor, resetting the compressor before starting each time, and stopping counting after the compressor is closed;
hdefrostingAnd resetting before defrosting is started each time for the running time of the compressor after defrosting is started, and stopping counting after defrosting is closed.
Heat energy W provided by the electric heatingElectric heating=Pd×hElectric heating
PdThe unit kW is the electric heating quantity and is measured by a laboratory;
helectric heatingAccumulating time for single operation of electric heating, resetting before the electric heating is started every time, and stopping counting after the electric heating is closed.
It is worth mentioning that: the invention does not limit the heating of the water tank by opening the water tank or the heating of the water tank by opening the heat pump or the electric heating or the heating of the heat pump and the electricity at the same time, the specific opening and closing sequence of the heat pump and the electric heating is automatically judged by a program according to the control logic of the system, and the invention does not disclose the specific control scheme of the heat pump and the electric heating.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (7)

1. A heat pump water heater start-stop control method based on water tank heat energy consumption is characterized in that: the method comprises the following steps:
step S1, recording a group of water tank inlet flow L01, ambient temperature T01, water tank lower temperature T02, water tank upper temperature T03, water tank inlet temperature T04 and hot water set temperature R01 data as input parameters at intervals of preset time according to a water inlet flow meter, an ambient temperature sensing head, a water tank lower temperature sensing head, a water tank upper temperature sensing head and a hot water set temperature set by a user; wherein, the rated inlet water temperature T05 of the water tank is converted according to the environmental temperature T01;
step S2, calculating the rated heat energy W of the water outlet tank according to the set hot water temperature R01 and the rated inlet water temperature T05 set by the userRated value
Step S3, calculating the actual heat energy W of the water tank according to the actual integrated water temperature AVE (T) of the water tank and the rated inlet water temperature T05 of the water tankPractice of
Step S4, according to the average inlet water temperature
Figure FDA0003084687860000011
Average water tank inlet volume
Figure FDA0003084687860000012
Calculating average user consumed thermal energy
Figure FDA0003084687860000014
Based on average user consumed heat energy
Figure FDA0003084687860000013
Calculating the heat energy W consumed by the user after the constant temperature shutdownn,m
Step S5, according to the heat energy W consumed by the user after the constant temperature shutdownn,mAnd the heat leakage quantity Q of the water tank when the unit is in standbyLeakage netOr according to the actual heat energy W of the water tankPractice ofAnd rated heat energy W of water tankRated valueAnd judging whether to start the water tank for heating, wherein the specific judgment is as follows:
when the heat energy lost by the water tank after the constant-temperature shutdown is more than or equal to the rated heat energy of the water tank multiplied by the heat energy sensitivity Q03, namely: wn,m+QLeakage net≥Q03×WRated valueStarting the water tank for heating;
when the actual heat energy W of the water tankPractice of≤(1-Q03-0.1)×WRated valueWhen the water tank is started to heat;
step S6, according to the heat energy W provided by the heat pumpHeat pumpHeat energy W provided by electric heatingElectric heatingAnd the heat leakage quantity Q' of the water tank during the operation of the unitLeakage netJudging whether to stop heating the water tank, and concretely judging as follows:
when the heat energy provided by the heat pump and the heat energy provided by the electric heating-the heat energy leaked by the water tank during the operation of the unit is larger than or equal to the heat energy consumed by a user after the constant-temperature shutdown, the method comprises the following steps: wHeat pump+WElectric heating-QˊLeakage net≥Wn,mAnd closing the water tank for heating.
2. The heat pump water heater start-stop control method based on water tank heat energy consumption according to claim 1, characterized in that: in the step S2, the rated heat energy W of the water tankRated value=CWater (W)×VWater tankX (R01-T05). times.1000, Unit: j;
wherein, CWater (W)The mass constant pressure heat capacity [ kJ/(kg. times. degree. C.) of water]A value of 4.187; vWater tankIs the rated volume of the water tank.
3. The heat pump water heater start-stop control method based on water tank heat energy consumption according to claim 1, characterized in that: in the step S3, the actual heat energy W of the water tankPractice of=CWater (W)×VWater tank×[AVE(T)-T05]X 1000, unit: j;
integrated water temperature ave (T) ═ 0.4 × T03+0.6 × T02, unit: DEG C.
4. The heat pump water heater start-stop control method based on water tank heat energy consumption according to claim 1, characterized in that: in the step S4, the average user consumption heat energy
Figure FDA0003084687860000024
Figure FDA0003084687860000025
The calculation method of (c) is as follows:
Figure FDA0003084687860000021
the unit is: j. the design is a square
Average inlet water temperature
Figure FDA0003084687860000022
After the water inlet flowmeter is started, taking an average value every 5s by a water inlet temperature sensing head of the water tank;
average water tank inlet volume
Figure FDA0003084687860000023
After the water inlet flow meter is started, taking an average number every 5s by the water inlet flow meter;
recording the number of times every 5s after the water inlet flowmeter is started, resetting after each constant-temperature shutdown, resetting again until the next constant-temperature shutdown, and setting the average counting number of times of the water inlet flowmeter after the constant-temperature shutdown as m;
and recording the number of times every 5s after the water inlet flow meter is started, never resetting, and setting the average counting number of the water inlet flow meter as n.
5. The heat pump water heater start-stop control method based on water tank heat energy consumption is characterized in that: in the step S4, the heat energy W consumed by the user after the constant temperature shutdownn,mThe calculation method of (c) is as follows:
Figure FDA0003084687860000031
unit: J.
6. the heat pump water heater start-stop control method based on water tank heat energy consumption according to claim 1, characterized in that: in step S5, the water tank leaks heat Q when the unit is in standbyLeakage net=PHeat leakage×hStandbyThe unit: KW/h; pHeat leakage=CWater (W)×VWater tank×THeat leakage3600 ÷ 24, unit: KW;
Theat leakageCompensating for temperature for heat leakage; h isStandbyResetting the machine set before the machine set is stopped every time for the standby time after the machine set is stopped, and stopping counting after the machine set is started;
q03 is the heat energy sensitivity, and the rated value range is 0.3-0.5.
7. The heat pump water heater start-stop control method based on water tank heat energy consumption according to claim 6, characterized in that: in step S6, the heat leakage Q' of the water tank during operation of the unitLeakage net=PHeat leakage×hOperation ofThe unit: KW/h;
hoperation ofIs hHeat pump/hElectric heatingTaking a larger value, resetting the running time of the unit after the unit is started, and stopping counting after the unit is stopped;
heat energy W provided by the heat pumpHeat pump=Q01×(hHeat pump-hDefrosting);
Q01 is the heating capacity of the heat pump, Q01 is K multiplied by Q, K is the attenuation coefficient of the performance of the heat pump, and Q is the heating capacity of the heat pump under all working conditions;
hheat pumpAccumulating time for single operation of the compressor, resetting the compressor before starting each time, and stopping counting after the compressor is closed;
hdefrostingAnd resetting before defrosting is started each time for the running time of the compressor after defrosting is started, and stopping counting after defrosting is closed.
Heat energy W provided by the electric heatingElectric heating=Pd×hElectric heating
PdHeating quantity for electric heating;
helectric heatingAccumulating time for single operation of electric heating, resetting before the electric heating is started every time, and stopping counting after the electric heating is closed.
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