CN111721034A - Variable-frequency efficient water source heat pump system and implementation method thereof - Google Patents
Variable-frequency efficient water source heat pump system and implementation method thereof Download PDFInfo
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- CN111721034A CN111721034A CN202010558527.1A CN202010558527A CN111721034A CN 111721034 A CN111721034 A CN 111721034A CN 202010558527 A CN202010558527 A CN 202010558527A CN 111721034 A CN111721034 A CN 111721034A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1931—Discharge pressures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1933—Suction pressures
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention relates to a frequency conversion high-efficiency water source heat pump system and an implementation method thereof, and the frequency conversion high-efficiency water source heat pump system comprises a heat pump unit, a wire controller, an external water pump and a water tank, wherein the heat pump unit comprises a compressor, an oil separator, a condenser, an evaporator, a gas-liquid separator and an oil return capillary tube, the frequency conversion high-efficiency water source heat pump system comprises a frequency conversion system and a fixed frequency system, the compressor is a frequency conversion compressor or a fixed frequency compressor, and the frequency conversion high-efficiency water source heat pump system is. The invention combines a variable frequency system and a fixed frequency system, detects the water temperature in real time through the temperature sensor, determines the initial target frequency according to the requirement, and effectively reduces the energy consumption of equipment; in the process of refrigeration or heating, the defects of high-speed operation or multiple starting and stopping of the water source heat pump at any time are overcome by loading or unloading the variable frequency compressor, so that the water temperature is ensured, the energy consumption is reduced, and the effects of high efficiency and energy saving are realized.
Description
Technical Field
The invention relates to the field of energy-saving equipment, in particular to a variable-frequency high-efficiency water source heat pump system and an implementation method thereof.
Background
The working principle of the water source heat pump unit is that heat is transferred to a water source under the condition of high environmental temperature; when the environment temperature is lower, energy is extracted from a relatively constant water source, the temperature is raised by utilizing the heat pump principle and taking air or water as secondary refrigerant, the water source heat pump has high operation efficiency, energy conservation, stable and reliable operation, and the difficult problems of defrosting of an air pump in winter and the like do not exist.
However, the existing water source heat pump constantly runs at a high speed or is frequently started and stopped for multiple times to meet the requirement of water temperature control, so that the existing water source heat pump is low in efficiency, large in power consumption and general in energy-saving effect; in addition, the service life of the equipment is also shortened by starting and stopping the equipment for many times.
The above problems are worth solving.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a variable-frequency high-efficiency water source heat pump system and an implementation method thereof.
The technical scheme of the invention is as follows:
on one hand, the frequency conversion high-efficiency water source heat pump system comprises a heat pump unit, a line controller, an external water pump and a water tank, wherein the heat pump unit comprises a compressor, an oil separator, a condenser, an evaporator, a gas-liquid separator and an oil return capillary tube, and is characterized in that the frequency conversion high-efficiency water source heat pump system comprises a frequency conversion system and a fixed frequency system, the compressor is a frequency conversion compressor or a fixed frequency compressor, the frequency conversion system comprises the heat pump unit, the frequency conversion compressor, a frequency conversion main circuit electronic expansion valve, a frequency conversion auxiliary circuit electronic expansion valve and a refrigerant cooling fin, the fixed frequency system comprises the heat pump unit, the fixed frequency compressor and a fixed frequency main circuit electronic expansion valve,
high-efficient water source heat pump system of frequency conversion is equipped with a plurality of temperature sensor, temperature sensor is including being located the compressor return air temperature sensor of compressor air inlet, being located the compressor exhaust temperature sensor of compressor gas outlet, being located the condensation of condenser water inlet temperature sensor, being located the condensation of condenser delivery port goes out water temperature sensor, is located the evaporimeter temperature sensor of evaporimeter air inlet and being located the water tank temperature sensor of water tank.
The invention according to the above technical scheme is characterized in that in the inverter system, an air outlet of the inverter compressor is connected with the condenser through the oil separator, the oil separator is connected with an air inlet of the inverter compressor through the oil return capillary tube, the air inlet of the inverter compressor is also connected with the evaporator through the gas-liquid separator, the inverter main circuit electronic expansion valve and the refrigerant cooling fin are arranged between the condenser and the evaporator, and the inverter auxiliary circuit electronic expansion valve is arranged between the inverter compressor and the condenser.
The invention according to the above scheme is characterized in that in the fixed frequency system, an air outlet of the fixed frequency compressor is connected with the condenser through the oil separator, the oil separator is connected with an air inlet of the variable frequency compressor through the oil return capillary tube, the air inlet of the variable frequency compressor is also connected with the evaporator through the gas-liquid separator, and the fixed frequency main circuit electronic expansion valve is arranged between the condenser and the evaporator.
The invention according to the above scheme is characterized in that the variable-frequency high-efficiency water source heat pump system is further provided with a plurality of pressure sensors, each pressure sensor comprises a high-pressure sensor and a low-pressure sensor, the high-pressure sensor is located at an air outlet of the compressor, and the low-pressure sensor is located at an air inlet of the compressor.
The invention according to the scheme is characterized in that the variable-frequency high-efficiency water source heat pump system further comprises a water flow switch and a control screen.
On the other hand, the implementation method of the frequency conversion high-efficiency water source heat pump system is characterized by comprising the following steps of:
1) host computer startup
The wire controller operates a host of the heat pump unit to start, the host selects an initial target frequency, and the compressor runs if necessary; the compressor is not operated in standby mode when no energy is needed;
2) host energy demand regulation judgment
After the variable frequency compressor operates to the initial target frequency for 3min, the host machine compares the water tank temperature TR interval with the set water outlet temperature Tset to obtain an energy-required adjustment judgment area and judge the energy requirement;
3) inverter compressor execution action
According to the adjustment judgment result, the inverter compressor performs loading or unloading, specifically,
301) when the machine is detected to be in the E area, zero clearing can be required immediately;
302) when the machine is detected to be in the D area, load reduction is performed every 40s, 4Hz reduction is performed every time, and the minimum is 36 Hz;
303) when the machine is detected to be in the C area, keeping the current energy output;
304) when the machine is detected to be in the B area, loading is executed every 40s, and 6Hz is added every time;
305) when the machine is detected to be in the area A, the maximum energy requirement is increased to 110 Hz;
4) detecting water temperature in real time, and performing variable frequency adjustment on a compressor;
5) shutdown of host
The wire controller operates the host of the heat pump unit to shut down.
The present invention according to the above aspect is characterized in that the initial target frequency in step 1) is determined by a difference Δ T between the actual tank temperature TR and the set leaving water temperature Tset, i.e., Δ T = TR-Tset,
when the delta T is higher than 4 ℃, the initial energy needs to be 40% of frequency conversion upper limit and fixed frequency;
when delta T is more than 3 and less than or equal to 4 ℃, the initial energy needs to be 40 percent of frequency conversion upper limit and fixed frequency;
when delta T is more than 2 and less than or equal to 3 ℃, the initial energy needs to be 40 percent of frequency conversion upper limit and fixed frequency;
when the delta T is more than 1.3 and less than or equal to 2 ℃, the initial energy needs to be 60 percent of variable frequency upper limit;
when delta T is more than 0.7 and less than or equal to 1.3 ℃, the initial energy needs to be 50 percent of the frequency conversion upper limit;
when the delta T is less than or equal to 0.7 ℃, the initial energy needs to be 0.
The invention according to the above aspect is characterized in that the comparison section in step 2) includes a compressor loading process and a compressor unloading process, and during the compressor loading process,
the A area is: the temperature TR of the water tank ranges from 0 to (Tset-0.6) DEG C;
the B area is: the temperature TR of the water tank ranges from (Tset-0.6) to (Tset-0.2) DEG C;
the C area is: the temperature TR of the water tank ranges from (Tset-0.2) to (Tset + 0.6) DEG C;
the D area is: the temperature TR of the water tank ranges from (Tset + 0.6) to (Tset + 1.0) DEG C;
the E area is: the range of the temperature TR of the water tank is more than (Tset + 1.0) DEG C;
during the unloading process of the compressor, the compressor is in a load-shedding state,
the E area is: the range of the temperature TR of the water tank is more than (Tset + 1.0) DEG C;
the D area is: the temperature TR of the water tank ranges from (Tset + 1.0) to (Tset + 0.3) DEG C;
the C area is: the temperature TR of the water tank ranges from (Tset + 0.3) to (Tset-0.5) DEG C;
the B area is: the temperature TR of the water tank ranges from (Tset-0.5) to (Tset-0.9) DEG C;
the A area is: the range of the water tank temperature TR is (Tset-0.9) DEG C-0.
The invention according to the above scheme is characterized in that, in the loading or unloading process of the variable frequency compressor in the step 3), the variable frequency compressor is influenced by the start-stop state of the fixed frequency compressor, and specifically: when the fixed frequency compressor is switched on from off, the frequency conversion compressor can be reduced to 48Hz, and the interval can be converted into the interval B, and the calculation is carried out again; when the fixed frequency compressor is turned on or off, the frequency conversion compressor can be required to be 80Hz at minimum, and the interval can be converted into the interval C, and the calculation is carried out again.
The invention according to the above scheme is characterized in that in the heating mode in the step 4), the operation frequency of the variable frequency compressor is limited by the evaporator temperature, the compressor discharge temperature and the input voltage.
The invention according to the scheme has the advantages that:
the invention combines a variable frequency system and a fixed frequency system, detects the water temperature in real time through the temperature sensor, determines the initial target frequency according to the requirement, and effectively reduces the energy consumption of equipment; in the process of refrigeration or heating, the variable frequency compressor is loaded or unloaded and is adjusted to a proper running frequency, so that the defect that the water source heat pump runs at a high speed constantly or is started and stopped for multiple times in the prior art is overcome, the water temperature is ensured, the energy consumption is reduced, and the effects of high efficiency and energy saving are realized.
Drawings
Fig. 1 is a system schematic diagram of a frequency conversion system according to the present invention.
Fig. 2 is a system schematic diagram of the fixed frequency system of the present invention.
FIG. 3 illustrates the adjustment required for the decision region in the present invention.
FIG. 4 is a graph of compressor operating frequency versus evaporator temperature.
FIG. 5 is a graph of compressor operating frequency versus compressor discharge temperature.
Fig. 6 is a graph of compressor operating frequency versus input voltage.
In the figure, 11, an inverter compressor; 12. a fixed-frequency compressor; 21. a frequency conversion main circuit electronic expansion valve; 22. a constant frequency main circuit electronic expansion valve; 3. a variable frequency auxiliary electronic expansion valve; 4. a cooling medium heat sink; 5. an oil separator; 6. a condenser; 7. an evaporator; 8. a gas-liquid separator; 9. and (4) an oil return capillary tube.
Detailed Description
For better understanding of the objects, technical solutions and effects of the present invention, the present invention will be further explained with reference to the accompanying drawings and examples. Meanwhile, the following described examples are only for explaining the present invention, and are not intended to limit the present invention.
As shown in fig. 1 and 2, the variable-frequency high-efficiency water source heat pump system comprises a heat pump unit, a line controller, an external water pump and a water tank, wherein the heat pump unit comprises a compressor, an oil separator, a condenser, an evaporator, a gas-liquid separator and an oil return capillary tube, the variable-frequency high-efficiency water source heat pump system comprises a variable-frequency system and a fixed-frequency system, and the compressor is a variable-frequency compressor or a fixed-frequency compressor. The frequency conversion high-efficiency water source heat pump system is provided with a plurality of temperature sensors, wherein the temperature sensors comprise a compressor return air temperature sensor positioned at an air inlet of a compressor, a compressor exhaust air temperature sensor positioned at an air outlet of the compressor, a condensation water inlet temperature sensor positioned at a water inlet of a condenser, a condensation water outlet temperature sensor positioned at a water outlet of the condenser, an evaporator temperature sensor positioned at an air inlet of an evaporator and a water tank temperature sensor positioned at a water tank.
The frequency conversion system further comprises a heat pump unit, a frequency conversion compressor, a frequency conversion main circuit electronic expansion valve, a frequency conversion auxiliary circuit electronic expansion valve and a refrigerant cooling fin, wherein in the frequency conversion system, an air outlet of the frequency conversion compressor is connected with the condenser through an oil separator, the oil separator is connected with an air inlet of the frequency conversion compressor through an oil return capillary tube, the air inlet of the frequency conversion compressor is also connected with the evaporator through an air-liquid separator, the frequency conversion main circuit electronic expansion valve and the refrigerant cooling fin are arranged between the condenser and the evaporator, and the frequency conversion auxiliary circuit electronic expansion valve is arranged between the frequency.
The fixed-frequency system comprises a heat pump unit, a fixed-frequency compressor and a fixed-frequency main circuit electronic expansion valve, wherein in the fixed-frequency system, an air outlet of the fixed-frequency compressor is connected with a condenser through an oil separator, the oil separator is connected with an air inlet of the variable-frequency compressor through an oil return capillary tube, the air inlet of the variable-frequency compressor is also connected with an evaporator through an air-liquid separator, and the fixed-frequency main circuit electronic expansion valve is arranged between the condenser and the evaporator.
The frequency conversion high-efficiency water source heat pump system is also provided with a plurality of pressure sensors, each pressure sensor comprises a high-pressure sensor and a low-pressure sensor, the high-pressure sensor is positioned at the gas outlet of the compressor, the low-pressure sensor is positioned at the gas inlet of the compressor, the high-pressure sensor detects the gas pressure at the gas outlet of the compressor and displays the gas pressure on the pressure gauge, and the low-pressure sensor detects the gas pressure at the gas inlet of the compressor and displays. The frequency conversion high-efficiency water source heat pump system is also provided with a water flow switch and a control screen.
The invention provides a method for realizing a frequency conversion high-efficiency water source heat pump system, which comprises the following steps:
1) host computer startup
The wire controller operates a host of the heat pump unit to start, the host selects an initial target frequency, and the compressor runs if necessary; the compressor is not operated in standby mode.
In the step 1), when the host determines that the energy is needed, before the compressor operates, the compressor needs to be started according to a limited starting platform rule, and then the target frequency is operated, specifically as follows:
a. if the target frequency is higher than 40Hz, the step-by-step loading is needed during the operation to the target frequency, and after the frequency corresponding to each step is reached, the frequency can not be continuously increased after the stable operation is carried out for 60s until the target frequency is reached;
b. if the target frequency is lower than 40Hz, directly downshifting to the target frequency;
c. under special requirements, such as frequency reduction or frequency limitation requirements, the compressor operates according to the current operating frequency, and if the current operating frequency is smaller than the minimum frequency of the current range, the compressor operates according to the minimum frequency.
The initial target frequency in the step 1) is determined by a difference Δ T between the actual tank temperature TR and the set leaving water temperature Tset, that is, Δ T = TR-Tset, specifically:
a. when the delta T is higher than 4 ℃, the initial energy needs to be 40% of frequency conversion upper limit and fixed frequency;
b. when delta T is more than 3 and less than or equal to 4 ℃, the initial energy needs to be 40 percent of frequency conversion upper limit and fixed frequency;
c. when delta T is more than 2 and less than or equal to 3 ℃, the initial energy needs to be 40 percent of frequency conversion upper limit and fixed frequency;
d. when the delta T is more than 1.3 and less than or equal to 2 ℃, the initial energy needs to be 60 percent of variable frequency upper limit;
e. when delta T is more than 0.7 and less than or equal to 1.3 ℃, the initial energy needs to be 50 percent of the frequency conversion upper limit;
f. when the delta T is less than or equal to 0.7 ℃, the initial energy needs to be 0.
2) Host energy demand regulation judgment
After the variable frequency compressor operates to the initial target frequency for 3min, the host machine compares the water tank temperature TR interval with the set water outlet temperature Tset to obtain an energy-required adjustment judgment area and judge the energy requirement;
the comparison area in the step 2) comprises a compressor loading process and a compressor unloading process,
during the loading of the compressor, it is,
the A area is: the temperature TR of the water tank ranges from 0 to (Tset-0.6) DEG C;
the B area is: the temperature TR of the water tank ranges from (Tset-0.6) to (Tset-0.2) DEG C;
the C area is: the temperature TR of the water tank ranges from (Tset-0.2) to (Tset + 0.6) DEG C;
the D area is: the temperature TR of the water tank ranges from (Tset + 0.6) to (Tset + 1.0) DEG C;
the E area is: the range of the temperature TR of the water tank is more than (Tset + 1.0) DEG C;
during the unloading process of the compressor, the compressor is in a load-shedding state,
the E area is: the range of the temperature TR of the water tank is more than (Tset + 1.0) DEG C;
the D area is: the temperature TR of the water tank ranges from (Tset + 1.0) to (Tset + 0.3) DEG C;
the C area is: the temperature TR of the water tank ranges from (Tset + 0.3) to (Tset-0.5) DEG C;
the B area is: the temperature TR of the water tank ranges from (Tset-0.5) to (Tset-0.9) DEG C;
the A area is: the range of the water tank temperature TR is (Tset-0.9) DEG C-0.
3) The frequency conversion compressor executes loading or unloading according to the judgment result, and specifically comprises the following steps:
a. when the machine is detected to be in the D area, load reduction is performed every 40s, 4Hz reduction is performed every time, and the minimum is 36 Hz;
b. when the machine is detected to be in the C area, keeping the current energy output;
c. when the machine is detected to be in the B area, loading is executed every 40s, and 6Hz is added every time;
d. when the machine is detected to be in the A area, the maximum energy requirement is increased to 110 Hz.
When the compressor is still required to be unloaded after the unloading is carried out to the lowest operation frequency, the compressor is closed, and the state of temperature-reaching shutdown is entered; the compressor needs to be started after the shutdown is finished at the temperature, and the compressor needs to be stopped for 3 min; and the frequency range of the frequency conversion compressor in the automatic adjusting mode is 36-110Hz, and the maximum frequency of the frequency conversion compressor in the manual adjusting mode is 120 Hz.
In the step 3), the variable frequency compressor is influenced by the start/stop state of the fixed frequency compressor in the loading or unloading process of the variable frequency compressor, and the method specifically comprises the following steps: when the fixed frequency compressor is switched on from off, the frequency conversion compressor can be reduced to 48Hz, and the interval can be converted into the interval B, and the calculation is carried out again; when the fixed frequency compressor is turned on or off, the frequency conversion compressor can be required to be 80Hz at minimum, and the interval can be converted into the interval C, and the calculation is carried out again. Influence rule of start-stop state of the fixed-frequency compressor:
a. when the fixed frequency compressor is switched on from off, the frequency conversion compressor can be reduced to 48Hz, and the interval can be converted into the interval B, and the calculation is carried out again;
b. when the fixed frequency compressor is turned on or off, the frequency conversion compressor can be required to be 80Hz at minimum, and the interval can be converted into the interval C, and the calculation is carried out again.
4) Detecting water temperature in real time, and performing variable frequency adjustment on a compressor;
as shown in fig. 4 to 6, in the step 4), the operation frequency is further limited by the evaporator temperature, the compressor discharge temperature and the input voltage in the inverter compressor heating mode, which is specifically described as follows:
a. limited by the evaporator temperature T3, as shown in figure 4,
during the loading of the compressor, it is,
when the evaporator temperature T3 ranges: 0-25 ℃, and the operating frequency of the compressor is as follows: 36-90 Hz;
when the evaporator temperature T3 ranges: 25-65 ℃, and the running frequency of the compressor is as follows: 36-110 Hz;
when the evaporator temperature T3 ranges: above 65 ℃, the compressor operating frequency is: 36-110 Hz.
During the unloading process of the compressor, the compressor is in a load-shedding state,
when the evaporator temperature T3 ranges: above 63 ℃, the compressor operating frequency is: 36-110 Hz;
when the evaporator temperature T3 ranges: 23-63 ℃, and the running frequency of the compressor is as follows: 36-110 Hz;
when the evaporator temperature T3 ranges: 0-25 ℃, and the operating frequency of the compressor is as follows: 36-90 Hz.
b. Limited by the compressor discharge temperature T5, as shown in figure 5,
during the loading of the compressor, it is,
when the compressor discharge temperature T5 ranges: the running frequency of the compressor is normally adjusted at the temperature of between 0 and 109 ℃;
when the compressor discharge temperature T5 ranges: 109-;
when the compressor discharge temperature T5 ranges: 111-113 ℃, and the maximum value of the running frequency of the compressor is 88 Hz;
when the compressor discharge temperature T5 ranges: 113 ℃ and 115 ℃, wherein the maximum value of the running frequency of the compressor is 72 Hz;
when the compressor discharge temperature T5 ranges: above 115 ℃ and the maximum value of the compressor operating frequency is 60 Hz.
During the unloading process of the compressor, the compressor is in a load-shedding state,
when the compressor discharge temperature T5 ranges: the maximum value of the running frequency of the compressor is 60Hz at the temperature of more than 113 ℃;
when the compressor discharge temperature T5 ranges: 113 ℃ and 111 ℃, and the maximum value of the running frequency of the compressor is 72 Hz;
when the compressor discharge temperature T5 ranges: 111-109 ℃, and the maximum value of the running frequency of the compressor is 88 Hz;
when the compressor discharge temperature T5 ranges: 109-;
when the compressor discharge temperature T5 ranges: and (4) at 107-0 ℃, and normally adjusting the running frequency of the compressor.
And when the frequency is limited, the frequency limitation condition is met, the adjustment is immediately carried out once, and the subsequent adjustment is carried out according to the frequency limitation interval time, so that the frequency reduction can only reach the minimum frequency allowed by the current range.
c. The input voltage vtimit, as shown in figure 6,
during the loading of the compressor, it is,
when the input voltage V ranges: 0-108V, the compressor is in a protection state;
when the input voltage V ranges: 180-190V, and the highest running frequency of the compressor is 70 Hz;
when the input voltage V ranges: 190 and 200V, the highest running frequency of the compressor is 90 Hz;
when the input voltage V ranges: above 200V, the compressor can be freely controlled.
During the unloading process of the compressor, the compressor is in a load-shedding state,
when the input voltage V ranges: over 195V, the compressor can be freely controlled;
when the input voltage V ranges: 195-185V, the maximum running frequency of the compressor is 90 Hz;
when the input voltage V ranges: 185-170V, the maximum running frequency of the compressor is 70 Hz;
when the input voltage V ranges: 0-170V, the compressor is in a protection state.
5) Shutdown of host
The wire controller operates the host of the heat pump unit to shut down.
The water pump is started all the time after the line controller is started, and is not closed when the compressor is unloaded when the temperature set value is reached, and the water pump is closed 120S after the compressor is closed after the line controller is shut down. Detecting a flow switch, namely detecting whether the flow switch has a fault or not, specifically, judging a closing state if the flow switch is closed within continuous 5s within 30s, and entering the next action; if no consecutive 5s detected a closure, then a flow switch failure is determined.
The wire controller in the invention has the following functions: the running mode and running state of the unit are displayed, the line controller can also display faults of each module or inquiry history faults, the line controller sets running parameters, the line controller is used for timing switching, the line controller sets the water outlet temperature Tset, the timing on-off function and the power failure memory function are realized.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A frequency conversion high-efficiency water source heat pump system comprises a heat pump unit, a line controller, an external water pump and a water tank, wherein the heat pump unit comprises a compressor, an oil separator, a condenser, an evaporator, a gas-liquid separator and an oil return capillary tube, and is characterized in that the frequency conversion high-efficiency water source heat pump system comprises a frequency conversion system and a fixed frequency system, the compressor is a frequency conversion compressor or a fixed frequency compressor, the frequency conversion system comprises the heat pump unit, the frequency conversion compressor, a frequency conversion main circuit electronic expansion valve, a frequency conversion auxiliary circuit electronic expansion valve and a refrigerant cooling fin, the fixed frequency system comprises the heat pump unit, the fixed frequency compressor and a fixed frequency main circuit electronic expansion valve,
high-efficient water source heat pump system of frequency conversion is equipped with a plurality of temperature sensor, temperature sensor is including being located the compressor return air temperature sensor of compressor air inlet, being located the compressor exhaust temperature sensor of compressor gas outlet, being located the condensation of condenser water inlet temperature sensor, being located the condensation of condenser delivery port goes out water temperature sensor, is located the evaporimeter temperature sensor of evaporimeter air inlet and being located the water tank temperature sensor of water tank.
2. The frequency conversion high-efficiency water source heat pump system according to claim 1, wherein in the frequency conversion system, an air outlet of the frequency conversion compressor is connected with the condenser through the oil separator, the oil separator is connected with an air inlet of the frequency conversion compressor through the oil return capillary tube, the air inlet of the frequency conversion compressor is also connected with the evaporator through the gas-liquid separator, the frequency conversion main circuit electronic expansion valve and the refrigerant cooling fin are arranged between the condenser and the evaporator, and the frequency conversion auxiliary circuit electronic expansion valve is arranged between the frequency conversion compressor and the condenser.
3. The frequency conversion high efficiency water source heat pump system according to claim 1, wherein in the constant frequency system, the air outlet of the constant frequency compressor is connected with the condenser through the oil separator, the oil separator is connected with the air inlet of the variable frequency compressor through the oil return capillary tube, the air inlet of the variable frequency compressor is further connected with the evaporator through the gas-liquid separator, and the constant frequency main circuit electronic expansion valve is arranged between the condenser and the evaporator.
4. The variable frequency high efficiency water source heat pump system of claim 1 further comprising a plurality of pressure sensors, wherein the pressure sensors comprise a high pressure sensor and a low pressure sensor, the high pressure sensor is located at the outlet of the compressor, and the low pressure sensor is located at the inlet of the compressor.
5. The variable frequency high efficiency water source heat pump system of claim 1 further comprising a flow switch and control panel.
6. A method for realizing a frequency conversion high-efficiency water source heat pump system is characterized by comprising the following steps:
1) host computer startup
The wire controller operates a host of the heat pump unit to start, the host selects an initial target frequency, and the compressor runs if necessary; the compressor is not operated in standby mode when no energy is needed;
2) host energy demand regulation judgment
After the variable frequency compressor operates to the initial target frequency for 3min, the host machine compares the water tank temperature TR interval with the set water outlet temperature Tset to obtain an energy-required adjustment judgment area and judge the energy requirement;
3) inverter compressor execution action
According to the judgment result, the inverter compressor performs loading or unloading, specifically,
301) when the machine is detected to be in the E area, zero clearing can be required immediately;
302) when the machine is detected to be in the D area, load reduction is performed every 40s, 4Hz reduction is performed every time, and the minimum is 36 Hz;
303) when the machine is detected to be in the C area, keeping the current energy output;
304) when the machine is detected to be in the B area, loading is executed every 40s, and 6Hz is added every time;
305) when the machine is detected to be in the area A, the maximum energy requirement is increased to 110 Hz;
4) detecting water temperature in real time, and performing variable frequency adjustment on a compressor;
5) shutdown of host
The wire controller operates the host of the heat pump unit to shut down.
7. The variable frequency high efficiency waterhead heat pump system according to claim 6, wherein the initial target frequency in step 1) is determined by the difference Δ T between the actual tank temperature TR and the set leaving water temperature Tset, i.e. Δ T = TR-Tset,
when the delta T is higher than 4 ℃, the initial energy needs to be 40% of frequency conversion upper limit and fixed frequency;
when delta T is more than 3 and less than or equal to 4 ℃, the initial energy needs to be 40 percent of frequency conversion upper limit and fixed frequency;
when delta T is more than 2 and less than or equal to 3 ℃, the initial energy needs to be 40 percent of frequency conversion upper limit and fixed frequency;
when the delta T is more than 1.3 and less than or equal to 2 ℃, the initial energy needs to be 60 percent of variable frequency upper limit;
when delta T is more than 0.7 and less than or equal to 1.3 ℃, the initial energy needs to be 50 percent of the frequency conversion upper limit;
when the delta T is less than or equal to 0.7 ℃, the initial energy needs to be 0.
8. The variable frequency high efficiency water source heat pump system of claim 6 wherein the comparison section of step 2) comprises a compressor loading process and a compressor unloading process,
during the loading of the compressor, it is,
the A area is: the temperature TR of the water tank ranges from 0 to (Tset-0.6) DEG C;
the B area is: the temperature TR of the water tank ranges from (Tset-0.6) to (Tset-0.2) DEG C;
the C area is: the temperature TR of the water tank ranges from (Tset-0.2) to (Tset + 0.6) DEG C;
the D area is: the temperature TR of the water tank ranges from (Tset + 0.6) to (Tset + 1.0) DEG C;
the E area is: the range of the temperature TR of the water tank is more than (Tset + 1.0) DEG C;
during the unloading process of the compressor, the compressor is in a load-shedding state,
the E area is: the range of the temperature TR of the water tank is more than (Tset + 1.0) DEG C;
the D area is: the temperature TR of the water tank ranges from (Tset + 1.0) to (Tset + 0.3) DEG C;
the C area is: the temperature TR of the water tank ranges from (Tset + 0.3) to (Tset-0.5) DEG C;
the B area is: the temperature TR of the water tank ranges from (Tset-0.5) to (Tset-0.9) DEG C;
the A area is: the range of the water tank temperature TR is (Tset-0.9) DEG C-0.
9. The frequency conversion high-efficiency water source heat pump system according to claim 6, wherein in the loading or unloading process of the frequency conversion compressor in the step 3), the influence of the start-stop state of the fixed-frequency compressor is specifically as follows: when the fixed frequency compressor is switched on from off, the frequency conversion compressor can be reduced to 48Hz, and the interval can be converted into the interval B; when the fixed frequency compressor is switched on and off, the frequency conversion compressor can need to be 80Hz at minimum, and can need to be switched into a C interval.
10. The variable frequency high efficiency water source heat pump system of claim 6 wherein in the heating mode of step 4), the variable frequency compressor operating frequency is limited by evaporator temperature, compressor discharge temperature and input voltage.
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