CN108006919B - Evaporative cooling type water chilling unit, and control method and control system thereof - Google Patents

Evaporative cooling type water chilling unit, and control method and control system thereof Download PDF

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Publication number
CN108006919B
CN108006919B CN201711129492.4A CN201711129492A CN108006919B CN 108006919 B CN108006919 B CN 108006919B CN 201711129492 A CN201711129492 A CN 201711129492A CN 108006919 B CN108006919 B CN 108006919B
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frequency
variable
exhaust pressure
equal
less
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CN108006919A (en
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覃业星
陈培生
刘洋
程琦
黄凯亮
钟海玲
刘思源
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/0035Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using evaporation
    • 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
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses an evaporative cooling type water chilling unit, a control method and a control system thereof. The control method comprises the following steps: and detecting the wet bulb temperature of the air inlet and outlet of the condenser and the exhaust pressure of the compressor, and controlling the frequency of the variable frequency fan and the variable frequency water pump according to the range of the exhaust pressure and the wet bulb temperature difference of the air inlet and outlet of the condenser. The invention can ensure that the energy efficiency of the compressor of the unit is optimal when the compressor operates in a normal operation range, reduce the waste of water resources, reduce the phenomenon of dry spots on the surface of the heat exchanger by controlling the water quantity and the air quantity supply, reduce the unstable operation state generated by high-voltage protection and improve the reliability of the unit after operation.

Description

Evaporative cooling type water chilling unit, and control method and control system thereof
Technical Field
The invention relates to the field of air conditioning equipment, in particular to an evaporative cooling type water chilling unit, and a control method and a control system thereof.
Background
In recent years, rail transit is greatly developed in China, ventilation air-conditioning equipment of a subway station gradually attracts people's attention, and due to the problems that the cooling tower is difficult to select a site, the energy consumption of the subway station is high and the like, the subway air-conditioning needs high reliability, low failure rate and energy-saving products, and an evaporative condensing unit can just solve the problems.
However, the existing evaporative condensing unit does not effectively control the water quantity and the air quantity, so that excessive waste of water resources is caused, huge noise is generated by large water supply quantity and air quantity, and the energy consumption of the unit is influenced by too large or too small water-air ratio, which hinders the popularization and application of the evaporative cooling technology and the unit.
Therefore, a brand new fan and water pump control scheme is proposed, which is a technical problem to be solved urgently in the industry.
Disclosure of Invention
The present invention aims to provide an evaporative cooling type water chiller, a control method and a control system thereof, which are directed to the defects of the prior art.
The invention adopts the technical scheme that a control method of an evaporative cooling type water chilling unit is provided, and the control method comprises the following steps: and detecting the wet bulb temperature of the air inlet and outlet of the condenser and the exhaust pressure of the compressor, and controlling the frequency of the variable frequency fan and the variable frequency water pump according to the range of the exhaust pressure and the wet bulb temperature difference of the air inlet and outlet of the condenser.
In one embodiment, the control method comprises the following steps:
step 1, detecting the exhaust pressure P of a compressor and judging whether the exhaust pressure is in a normal operation range;
step 2, when the exhaust pressure is less than or equal to the critical value of the lowest high pressure (P is less than or equal to A), judging whether the temperature difference value of the inlet and outlet air wet balls is less than the critical value of the highest temperature difference value of the inlet and outlet air inlet (delta t is less than D), if so, turning to the step 3, otherwise, turning to the step 4;
step 3, reducing the frequency of the variable frequency fan, reducing the air quantity, and then continuously detecting the exhaust pressure of the compressor;
step 4, reducing the frequency of the variable frequency water pump, reducing the water quantity, and then continuously detecting the exhaust pressure of the compressor;
step 5, when the exhaust pressure is between the critical value of the lowest high pressure and the critical value of the highest high pressure (A is more than P and less than B), judging whether the temperature difference value of the wet balls of the air inlet and the air outlet is less than or equal to the critical value of the temperature difference value of the wet balls of the air inlet and the air outlet (delta t is less than or equal to C), if so, turning to step 6, otherwise, turning to step 7;
step 6, increasing the frequency of the variable frequency water pump, increasing the water quantity, and then continuously detecting the exhaust pressure of the compressor;
step 7, judging whether the temperature difference value of the wet balls of the air inlet and the air outlet is smaller than the critical value (delta t is smaller than D) of the temperature difference of the wet balls of the highest air inlet and the air outlet, if so, turning to the step 8, and if not, turning to the step 4;
step 8, the frequency of the variable frequency fan and the variable frequency water pump is unchanged, the variable frequency fan and the variable frequency water pump stably operate, and the exhaust pressure of the compressor is continuously detected;
9, when the exhaust pressure is greater than or equal to the critical value of the highest high pressure (P is greater than or equal to B), judging whether the temperature difference value of the wet balls of the air inlet and the air outlet is less than or equal to the critical value of the temperature difference of the wet balls of the air inlet and the air outlet (delta t is less than or equal to C), if so, turning to the step 6, and if not, turning to the step 10;
step 10, judging whether the temperature difference value of the wet bulb of the air inlet and the air outlet is smaller than the critical value (delta t is smaller than D) of the temperature difference of the wet bulb of the highest air inlet and the air outlet, if so, turning to the step 11, and if not, turning to the step 12;
step 11, increasing the frequency of the variable frequency fan and the variable frequency water pump at the same time, and then continuously detecting the exhaust pressure of the compressor;
and 12, increasing the frequency of the variable frequency fan, and then continuously detecting the exhaust pressure of the compressor.
The invention also provides a control system of the evaporative cooling type water chilling unit, which comprises the following components:
the humidity acquisition module is used for acquiring the wet bulb temperature of the inlet air and the outlet air of the condenser;
the pressure acquisition module is used for acquiring the exhaust pressure of the compressor;
the first comparison module is used for judging whether the exhaust pressure is in a set operation range;
the second comparison module is used for judging whether the temperature difference of the wet balls of the air inlet and the air outlet of the condenser is within a set operation range or not;
and the execution module is used for controlling the frequency of the variable-frequency fan and the variable-frequency water pump according to the judgment results of the first module and the second module.
The execution module works according to the following steps:
when P is less than or equal to A and delta t is less than D, reducing the frequency of the variable frequency fan and reducing the air volume; when P is less than or equal to A and delta t is greater than or equal to D, reducing the frequency of the variable-frequency water pump;
when A is more than P and less than B and delta t is less than or equal to C, increasing the frequency of the variable frequency water pump and increasing the water quantity; when A is more than P and less than B and delta t is more than C, judging that delta t is more than D, if so, keeping the frequency of the variable-frequency water pump and the variable-frequency fan unchanged, stably operating, and if not, reducing the frequency of the variable-frequency water pump;
when P is larger than or equal to B and delta t is smaller than or equal to C, increasing the frequency of the variable-frequency water pump; if P is larger than or equal to B and delta t is larger than C, judging that delta t is smaller than D, and if so, increasing the frequency of the variable frequency fan and the variable frequency water pump; and if not, increasing the frequency of the variable frequency fan.
The invention also provides an evaporative cooling type water chilling unit which comprises a compressor, a condenser and a control system, wherein the condenser adopts a tower type water cooling system and comprises a variable frequency fan and a variable frequency water pump, a wet bulb temperature sensor is arranged at an air inlet and an air outlet of the condenser, a pressure sensor is arranged at an exhaust pipe of the compressor, and the control system controls the frequency of the variable frequency fan and the variable frequency water pump according to the range of the exhaust pressure of the compressor and the wet bulb temperature difference value of the air inlet and the air outlet of the condenser.
Compared with the prior art, the invention supplies proper air quantity and water quantity to the condenser by utilizing the variable frequency fan and the variable frequency water pump, thereby achieving the best water-air ratio and the best energy efficiency; in addition, the invention also solves the problem of poor regional universality, can meet the normal operation of the unit under high load heat exchange quantity, avoids long-time high load operation of a fan and a water pump, prolongs the service life of devices, and promotes the application of the evaporative condensing unit.
Drawings
FIG. 1 is a schematic diagram of an evaporative cooling chiller;
FIG. 2 is a schematic diagram of the control system of the present invention;
FIG. 3 is a flow chart of the method of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in fig. 1, the evaporative cooling type water chiller includes a compressor 1, a condenser 2, a throttle valve 3, and a shell-and-tube evaporator 4. The condenser adopts a tower type water cooling system and comprises a variable frequency fan 5, a variable frequency water pump 6 and a water tank 10. The air inlet of the condenser is provided with a wet bulb temperature sensor 7, the air outlet is provided with a wet bulb temperature sensor 8, and the exhaust pipe of the compressor is provided with a pressure sensor 9.
As shown in fig. 2, the control system of the evaporative cooling type water chilling unit according to the present invention includes:
the humidity acquisition module is used for acquiring the wet bulb temperature of the inlet air and the outlet air of the condenser;
the pressure acquisition module is used for acquiring the exhaust pressure of the compressor;
the first comparison module is used for judging whether the exhaust pressure is in a set operation range;
the second comparison module is used for judging whether the temperature difference of the wet balls of the air inlet and the air outlet of the condenser is within a set operation range or not;
and the execution module is used for controlling the output of the variable-frequency fan and the variable-frequency water pump according to the judgment results of the first module and the second module.
According to the invention, the temperature and humidity sensors are respectively arranged at the air inlet and the air outlet of the evaporative condenser and are used for detecting the temperature t1 of an inlet air wet bulb and the temperature t2 of an outlet air wet bulb, the pressure sensor is used for detecting the pressure P of the high-pressure side of the compressor, and the variable frequency fan and the variable frequency water pump provide the proper air volume and water volume of the condenser under the condition of ensuring that the high-pressure is in a normal operation range.
The control method provided by the invention is characterized in that after the unit is started to be Ts, the pressure P of the exhaust pipe of the compressor and the temperature difference delta t (delta t = t 2-t 1) of the air inlet and outlet wet bulb of the condenser are detected, the operating frequency of the variable frequency fan and the variable frequency water pump is adjusted by judging the range of the pressure and the temperature difference, and the water-air ratio in the condenser is changed, so that the high-pressure is influenced, and the unit can stably operate.
When the compressor of the evaporative cooling unit operates, high pressure needs to operate in a proper range, the air inlet wet bulb temperature t1 is the environment wet bulb temperature, when the condenser water-gas ratio is low, the air outlet relative humidity is also correspondingly low, at the moment, the air outlet wet bulb temperature t2 is also low, namely, delta t is small.
Under certain environmental conditions, t1 is constant, and as Δ t increases, the amount of water evaporated increases, the condensation temperature correspondingly decreases, and the high pressure also decreases. The unit operation high pressure and the inlet and outlet air port wet bulb temperature have the most suitable range under different environments: a < P < B; c < Δ t < D.
Wherein: a-minimum high pressure threshold;
b-highest high pressure critical value;
c, a critical value of the temperature difference of the wet bulb of the lowest air inlet and outlet;
d, a critical value of the temperature difference of the wet bulb at the highest air inlet and outlet.
According to the judgment logic, the air quantity and the water quantity are adjusted to enable the unit to normally operate.
The control method provided by the invention specifically comprises the following steps:
step 1, detecting the exhaust pressure P of a compressor after a unit is started Ts and judging the range of the exhaust pressure;
step 2, when the exhaust pressure is less than or equal to the critical value of the lowest high pressure (P is less than or equal to A), judging whether the temperature difference value of the wet balls of the air inlet and the air outlet is less than the critical value of the temperature difference of the wet balls of the highest air inlet and the air outlet (delta t is less than D), if so, turning to the step 3, otherwise, turning to the step 4;
step 3, reducing the frequency of the variable frequency fan, reducing the air volume, ensuring the normal operation of the unit, saving the energy consumption of the fan, reducing the noise of the fan, and then continuously detecting the exhaust pressure of the compressor;
step 4, reducing the frequency of the variable frequency water pump, reducing the water quantity, ensuring the normal operation of the unit, simultaneously reducing the power consumption of the water pump, reducing the waste of water resources, then continuously detecting the exhaust pressure of the compressor,
step 5, when the exhaust pressure is between the critical value of the lowest high pressure and the critical value of the highest high pressure (A is more than P and less than B), judging whether the temperature difference value of the wet balls of the air inlet and the air outlet is less than or equal to the critical value of the temperature difference value of the wet balls of the air inlet and the air outlet (delta t is less than or equal to C), if so, turning to step 6, otherwise, turning to step 7;
step 6, increasing the frequency of the variable frequency water pump, increasing the water quantity, ensuring the normal water quantity required by the unit, increasing the heat exchange quantity of the condenser, improving the performance of the whole machine, and then continuously detecting the exhaust pressure of the compressor;
step 7, judging whether the temperature difference value of the wet balls of the air inlet and the air outlet is smaller than the critical value (delta t is smaller than D) of the temperature difference of the wet balls of the air inlet and the air outlet, if so, turning to the step 8, otherwise, turning to the step 4, reducing the frequency of the variable frequency water pump, reducing the water supply, ensuring the normal operation of the unit and reducing the power consumption of the water pump;
step 8, stably operating, wherein the water quantity and the air quantity of the condenser are in appropriate states, and then continuously detecting the exhaust pressure of the compressor;
9, when the exhaust pressure is greater than or equal to the critical value of the highest high pressure (P is greater than or equal to B), judging whether the temperature difference value of the wet balls of the air inlet and the air outlet is less than or equal to the critical value of the temperature difference of the wet balls of the air inlet and the air outlet (delta t is less than or equal to C), if so, turning to the step 6, and if not, turning to the step 10;
step 10, judging whether the temperature difference value of the wet bulb of the air inlet and the air outlet is smaller than the critical value (delta t is smaller than D) of the temperature difference of the wet bulb of the highest air inlet and the air outlet, if so, turning to the step 11, and if not, turning to the step 12;
step 11, increasing the frequency of the variable frequency fan and the variable frequency water pump at the same time, and then continuously detecting the exhaust pressure of the compressor;
and 12, increasing the frequency of the variable frequency fan, and then continuously detecting the exhaust pressure of the compressor.
Through the control process, the optimal energy efficiency of the unit compressor can be guaranteed when the unit compressor operates within a normal operation range, waste of water resources is reduced, dry spots on the surface of the heat exchanger are reduced by controlling water quantity and air quantity supply, unstable operation state caused by high-voltage protection is reduced, reliability of the unit after operation is improved, and user experience is improved.
The above examples are intended only to illustrate specific embodiments of the present invention. It should be noted that, for a person skilled in the art, several modifications and variations can be made without departing from the inventive concept, and these modifications and variations shall fall within the protective scope of the present invention.

Claims (4)

1. A control method for an evaporative cooling type water chilling unit is characterized by comprising the following steps: the method comprises the following steps of detecting the wet bulb temperature of air inlet and outlet of a condenser and the exhaust pressure of a compressor, and controlling the frequency of a variable frequency fan and a variable frequency water pump according to the range of the exhaust pressure and the range of the wet bulb temperature difference value of the air inlet and outlet of the condenser, wherein the method specifically comprises the following steps:
step 1, detecting the exhaust pressure P of a compressor and judging whether the exhaust pressure is in a normal operation range;
step 2, when the exhaust pressure is less than or equal to the critical value of the lowest high pressure, namely P is less than or equal to A, judging whether the temperature difference value of the wet balls of the air inlet and the air outlet is less than the critical value of the temperature difference of the highest wet balls of the air inlet and the air outlet, namely judging that delta t is less than D, if so, turning to the step 3, and if not, turning to the step 4;
step 3, reducing the frequency of the variable frequency fan, reducing the air quantity, and then continuously detecting the exhaust pressure of the compressor;
step 4, reducing the frequency of the variable frequency water pump, reducing the water quantity, and then continuously detecting the exhaust pressure of the compressor;
step 5, when the exhaust pressure is between the critical value of the lowest high pressure and the critical value of the highest high pressure, namely A is more than P and less than B, judging whether the temperature difference value of the wet balls of the air inlet and the air outlet is less than or equal to the critical value of the temperature difference of the wet balls of the air inlet and the air outlet, namely judging that delta t is less than or equal to C, if so, turning to step 6, otherwise, turning to step 7;
step 6, increasing the frequency of the variable frequency water pump, increasing the water quantity, and then continuously detecting the exhaust pressure of the compressor;
step 7, judging whether the temperature difference value of the wet balls of the air inlet and the air outlet is smaller than the critical value of the temperature difference of the wet balls of the highest air inlet and the highest air outlet, namely judging that delta t is smaller than D, if so, turning to the step 8, and if not, turning to the step 4;
step 8, the frequency of the variable frequency fan and the variable frequency water pump is unchanged, the variable frequency fan and the variable frequency water pump stably operate, and the exhaust pressure of the compressor is continuously detected;
9, when the exhaust pressure is greater than or equal to the critical value of the highest high pressure, namely P is greater than or equal to B, judging whether the temperature difference value of the wet balls of the air inlet and the air outlet is less than or equal to the critical value of the temperature difference of the wet balls of the air inlet and the air outlet, namely judging that delta t is less than or equal to C, if so, turning to the step 6, and if not, turning to the step 10;
step 10, judging whether the temperature difference value of the wet balls of the air inlet and the air outlet is smaller than the critical value of the temperature difference of the wet balls of the highest air inlet and the air outlet, namely judging that delta t is smaller than D, if so, turning to step 11, and if not, turning to step 12;
step 11, increasing the frequency of the variable frequency fan and the variable frequency water pump at the same time, and then continuously detecting the exhaust pressure of the compressor;
and 12, increasing the frequency of the variable frequency fan, and then continuously detecting the exhaust pressure of the compressor.
2. A control system for an evaporative cooling chiller, the control system using the control method of claim 1 and comprising:
the humidity acquisition module is used for acquiring the wet bulb temperature of the inlet air and the outlet air of the condenser;
the pressure acquisition module is used for acquiring the exhaust pressure of the compressor;
the first comparison module is used for judging whether the exhaust pressure is in a set operation range;
the second comparison module is used for judging whether the temperature difference of the wet balls of the air inlet and the air outlet of the condenser is within a set operation range or not;
and the execution module is used for controlling the frequency of the variable-frequency fan and the variable-frequency water pump according to the judgment results of the first comparison module and the second comparison module.
3. The control system of claim 2,
when P is less than or equal to A and delta t is less than D, reducing the frequency of the variable frequency fan and reducing the air volume; when P is less than or equal to A and delta t is greater than or equal to D, reducing the frequency of the variable-frequency water pump;
when A is more than P and less than B and delta t is less than or equal to C, increasing the frequency of the variable frequency water pump and increasing the water quantity; when A is more than P and less than B and delta t is more than C, judging that delta t is more than D, if so, keeping the frequency of the variable-frequency water pump and the variable-frequency fan unchanged, stably operating, and if not, reducing the frequency of the variable-frequency water pump;
when P is larger than or equal to B and delta t is smaller than or equal to C, increasing the frequency of the variable-frequency water pump; if P is larger than or equal to B and delta t is larger than C, judging that delta t is smaller than D, and if so, increasing the frequency of the variable frequency fan and the variable frequency water pump; and if not, increasing the frequency of the variable frequency fan.
4. An evaporative cooling chiller using the control method of claim 1.
CN201711129492.4A 2017-11-15 2017-11-15 Evaporative cooling type water chilling unit, and control method and control system thereof Active CN108006919B (en)

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CN112393345B (en) * 2020-11-30 2022-04-22 珠海格力电器股份有限公司 Water pump frequency control method and device, evaporative cooler and air conditioning system
CN114279049A (en) * 2021-12-22 2022-04-05 珠海格力电器股份有限公司 Refrigerating unit and control method for automatically optimizing frequency of variable frequency fan of refrigerating unit

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