WO2015058421A1

WO2015058421A1 - Condenser heat dissipation enhancing device for compression refrigerating machine and control method thereof

Info

Publication number: WO2015058421A1
Application number: PCT/CN2013/086401
Authority: WO
Inventors: 谭拥政
Original assignee: 珠海风合节能科技开发有限公司
Priority date: 2013-10-23
Filing date: 2013-11-01
Publication date: 2015-04-30
Also published as: CN103557643A

Abstract

A condenser heat dissipation enhancing device for a compression refrigerating machine. The condenser heat dissipation enhancing device mounted on a condenser coil comprises a flow-guiding cover (1), an electric ventilator (3), an air flow-guiding plate (2), a water pump (8), a sensor group (10, 11, 12), an MCU control module (9), a water-mist spraying pipe group, a nozzle group and water pipes (7). The periphery of a condenser coil (4) is wrapped by the flow-guiding cover (1). The electric ventilator (3) is arranged at one end of the flow-guiding cover (1), and the air flow-guiding plate (2) is arranged at the other end of the flow-guiding cover (1). The MCU control module (9) is electrically connected with the electric ventilator (3), the water pump (8), and the sensor group (10, 11, 12). The MCU control module (9) controls the operating conditions of the electric ventilator (3) and the water pump (8) by receiving and analyzing the temperature signals and the pressure signals from sensors. A control method of the condenser heat dissipation enhancing device for a compression refrigerating machine. The condenser heat dissipation enhancing device comprises the sensor group (10, 11, 12) and the MCU control module (9). The MCU control module (9) controls the operating conditions of the electric ventilator (3) and the water pump (8) by receiving and analyzing the temperature signals and the pressure signals from sensors. The condenser heat dissipation enhancing device can replace a heat dissipation water tower and a circulation pipeline system of a water-cooling refrigerating group and improve the running efficiency of the refrigerating group in extreme environments when mounted on an air-cooling refrigerating machine.

Description

Condenser heat dissipation enhancement device of compression refrigerator and control method thereof

Technical field

The invention relates to the technical field of a condenser heat sink, and in particular to a condenser heat sink enhancement device for a compression refrigerator and a control method thereof.

Background technique

Analysis of the structure, advantages and disadvantages of common radiators:

Structure of water-cooled condenser

The water-cooled condenser requires a system to support its operation. The system includes a cooling water tank that encloses the condenser cooling coil, a cooling water circulation line connecting the cooling water tank and the cooling tower, a main water pump, a backup water pump, a control valve, and a bypass line. Etc., and the structure of the cooling tower is mostly made up of the tower body, which is filled with corrugated packing. There is a cooling water spray pipe above the packing. The motor fan blades are used at the top of the tower to suck the outside air from the lower part of the cooling tower. The heat exchange is effected by the hotter cooling water on the surface of the corrugated packing, the cooling water is cooled, and the heated air is discharged into the atmosphere from the top of the cooling tower. The cooled cooling water is pumped to the cooling water tank for the next cycle.

Advantages of water-cooled condensers

The advantage of water cooling is that the cooling effect is better.

The disadvantages of water-cooled condensers are:

1. The system has a large area, complicated structure, high cost, long pipeline, and high power of the drive motor of the pump and the fan. This power consumption does not participate in refrigeration, which is useless work. Take the XX water cooling unit as an example. The cooling capacity is 100KW. If the power of the scroll compressor is 25KW, the cooling tower is on the roof of the eighth floor, the cooling pump head is 30 meters, the pump power is 11KW, and the installed cooling tower fan is equipped with an electromechanical power of 2.5KW. It is 38.5KW, and the power of the water pump and water tower fan motor which is useless is 13.5KW, which accounts for 35% of the total installed electric power.

2, the cooling tower fan will also blow the water to the surrounding, called "flying water", this "flying water" pollution in some countries or regions of the law is subject to fines. At the same time, the low frequency vibration and noise of the cooling tower often cause complaints.

3. The heat dissipation efficiency is good when the machine is installed, but because the heat sink is open, the dust, microorganisms and algae in the air are absorbed in a large amount during the heat exchange with the cooling water, and the cooling water enters the circulation. The water pipeline is deposited and mass-produced, and adheres to the heat exchange surface of the refrigerant pipeline, which reduces the efficiency of heat exchange, and the heat exchange efficiency accelerates and decreases with time. Due to the varying degrees of length and curvature of the circulating water line, various attempts to perform pipe cleaning are not effective. In areas with large dust and dust, the cooling towers and pipelines may even be fouled, causing the refrigeration unit to shut down.

4. Because of the aging speed of the cooling tower packing under the action of sunlight, air, hot water and microorganisms, it must be stopped and replaced regularly, and the cost is high. For some users who require continuous operation of the refrigeration system (such as cold storage, etc.), forced shutdown due to the above reasons is unacceptable.

Air-cooled condenser structure

During operation of the air-cooled chiller, the refrigerant enters the coil on the condenser from the outlet end of the compressor at a higher temperature and pressure. The motor on one side of the coil drives the fan blades, and the two in the condenser coil Side manufacturing pressure difference, to achieve forced ventilation, the heat of the refrigerant is conducted to the air flowing through the condenser coil, the temperature and pressure of the refrigerant are reduced to a certain extent, and then the liquid is introduced into the evaporator through the throttle valve to evaporate and cool, and then the refrigerant is in a gaseous state. Go back to the compressor inlet and go to the next cycle.

Advantages of air-cooled condensers

The utility model has the advantages of small volume, small occupied area, simple system, relatively low manufacturing, installation and operation cost, small maintenance workload, and good reliability in the case of moderate ambient temperature.

The disadvantages of air-cooled condensers are:

1. The cooling medium of the air-cooled condenser is air, which is radiated by the air and the condenser coil for heat conduction, and the heat capacity of the air is only 1.0*103J/(kg.°C), and the heat dissipation effect depends on the ambient temperature is lower than The difference between the temperature of the condenser coil. When the difference is insufficient, the air flowing through the condenser coil cannot take enough heat to make the temperature and pressure of the refrigerant at the outlet end of the condenser higher than the ideal working temperature and pressure. The load is aggravated, causing a sharp increase in power consumption and a corresponding increase in cooling capacity. Under extreme conditions where the ambient temperature approaches the condenser coil temperature, the compressor may even be shut down due to excessive load.

2. Due to the defects of the traditional condenser layout and the structure of the fan, the air flow field on the surface of the condenser heat-dissipating coil is unreasonable, and there is more or less “dry point”, that is, the local air flow on the surface of the condenser is not smooth. The local temperature of the heat sink is high, which drags down the overall heat dissipation efficiency of the condenser.

3. When the ambient temperature is too high, some air-cooled condensers use direct water spray on the condenser (including condensed water and external water source collected by the evaporator) to reduce the temperature and consume a large amount of water. In the water area, if the spray water is recycled, the water will be contaminated by dust and microbes. The increase in maintenance will eventually lead to a significant decrease in heat dissipation efficiency. On the other hand, when the ambient temperature and humidity are high, The evaporation rate of the spray water decreases, and the cooling efficiency decreases. This method does not solve the problem of cooling efficiency in extreme working environments.

The significance of improving condenser efficiency

Whether it is a water-cooled condenser or a conventional air-cooled condenser, when the heat dissipation efficiency is lowered, the refrigerant pressure and temperature are higher than the ideal working temperature and pressure, the cooling efficiency is lowered, and the power consumption is increased. According to statistics, in a certain interval, the compressor power consumption is reduced by 5% for every 1 degree Celsius of refrigerant temperature at the inlet of the evaporator. Therefore, controlling the temperature of the refrigerant within the ideal operating temperature range has enormous potential for energy saving.

Ways to improve the heat dissipation efficiency of the condenser

According to thermal principles, the way heat is emitted includes evaporation, convection, conduction and radiation.

When the condenser uses a water-cooled heat sink to dissipate heat, the heat dissipation effect is good because the specific heat capacity of the water is large and the above four heat dissipation modes are all functioning when the system is in operation. When the circulating cooling water is contaminated by dust and microorganisms, the scale formed on the surface of the condenser coil prevents the refrigerant from transferring heat to the cooling water, so that the heat dissipation efficiency is lowered. If the water has a large heat capacity and does not rely on the heat sink, it can also use the evaporation, convection, conduction and radiation to dissipate heat at the same time, which can greatly improve the heat dissipation efficiency of the condenser.

technical problem

The object of the present invention is to provide a condenser heat dissipation enhancement device for a compression type refrigerator and a control method thereof, which have the above problems The utility model has the advantages of simple structure, high reliability and low operating cost, and can be used to replace the cooling water tower and the circulating pipeline system of the water-cooled refrigeration unit, and can be greatly improved in the extreme environment when installed in an air-cooled refrigerator. effectiveness.

Technical solution

In order to achieve the above object, the present invention adopts the following technical solutions:

The condenser heat dissipation enhancement device of the compression refrigerator is installed at a condenser coil, and the condenser coil is divided into an inlet end and an outlet end, and the method includes:

The deflector is sleeved on the periphery of the condenser, and has a flow passage extending from one end to the other end;

An electric ventilator fixed at one end of the flow passage;

An air deflector fixed at the other end of the flow channel and provided with a plurality of openings and baffles for cooperating with the air flow;

a water mist device comprising a water pump, a nozzle group, a water mist jet tube group and a water pipe; the water pump having a water inlet and a water outlet; and a water mist jet tube group fixed to the air channel of the flow channel The inside of the flow plate end is composed of a plurality of parallel water mist jet tubes; the nozzle group is fixed inside the air deflector end of the flow channel, and is composed of a plurality of nozzles, and each nozzle is correspondingly mounted on the water mist jet tube; a water pipe, one end of which is connected to the water outlet provided by the water pump, and the other end is connected to the water mist jet pipe;

a sensor group consisting of a first temperature sensor mounted at the inlet end, a second temperature sensor mounted at the outlet end, and a pressure sensor mounted at the outlet;

The MCU control module is electrically connected to the electric fan, the water pump, the power module, the input module, the first temperature sensor, the second temperature sensor, and the pressure sensor.

MCU (Micro Control Unit) The Chinese name is a micro control unit, also known as a single chip microcomputer (Single Chip Microcomputer) or a single chip microcomputer.

The flow channel is divided into a first region for installing the electric fan, a second region for installing the condenser, and a water mist jet pipe and a nozzle group, which are sequentially arranged from the electric fan end to the air deflector end. The third area. The distribution of the three regions of the flow channel determines the direction of the cooling airflow and improves the cooling effect.

The flow channel gradually shrinks from the second region to the electric fan end into a circular ring channel, which is beneficial to improve the cooling effect.

The air deflector is connected to the shroud by a snap structure or by bolts.

The angle between the nozzle jet direction and the end face of the condenser coil is between 0° and 180°, which is beneficial to improve the cooling effect.

A condenser heat dissipation enhancement device control method for a compression refrigerator is characterized in that:

A1, the MCU control module determines whether the compression chiller is turned on, if it is transferred to step A2;

A2, the first temperature sensor and the second temperature sensor respectively detect the temperature of the refrigerant at the inlet and outlet of the condenser, and proceeds to step A3;

A3. The MCU control module receives temperature signals of the first temperature sensor and the second temperature sensor, and the built-in processor of the MCU control module analyzes and determines the temperature signal, and if the temperature is lower than the preset low temperature line, then transfers to the A4. If the temperature is higher than the low temperature line and lower than the highest preset temperature line, then transfer to A5, if the temperature is higher than the highest preset temperature line, then transfer to A6;

A4. The MCU control module sends an air cooling signal to the electric fan, and the electric fan starts to run;

A5. The MCU control module sends a water cooling signal to the water pump, the water pump operates normally, and the MCU control module sends an air cooling signal to the electric ventilator, and the electric ventilator operates normally;

A6. The MCU control module sends an enhanced water cooling signal to the water pump, and the water pump accelerates the operation to increase the water pressure. The MCU control module sends an enhanced air cooling signal to the electric fan, and the electric fan accelerates the operation to increase the flow rate.

Beneficial effect

The control method of the condenser heat dissipation enhancement device of the compression type refrigerator of the invention adjusts the operation state of the water pump and the electric fan according to the actual temperature condition, so as to achieve an energy-saving and high-efficiency heat dissipation effect.

The present invention adopts the above structure Simple structure, low cost, high reliability, and low operating cost; used to transform water-cooled refrigeration units, instead of cooling towers and water circulation systems, can greatly improve the efficiency of such refrigeration systems, installed in air-cooled In the case of a chiller, the operating efficiency and reliability in extreme environments can be greatly improved.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other similar drawings may be derived from those skilled in the art without any inventive labor.

Figure 1 is a schematic structural view of the present invention;

2 is a schematic diagram of a circuit module of the present invention;

Figure 3 is a schematic view of the steps of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the invention

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

As shown in FIG. 1 to FIG. 3, the condenser heat dissipation enhancement device of the compression type refrigerator of the present invention is installed at the condenser coil 4, and the condenser coil 4 is divided into an inlet end and an outlet end, and includes:

The shroud 1 is sleeved on the periphery of the condenser, and has a flow passage extending from one end to the other end;

Electric ventilator 3, which is fixed at one end of the flow channel;

An air baffle 2 fixed at the other end of the flow channel and provided with a plurality of openings and baffles for cooperating with the air flow;

a water pump 8, which is provided with a water inlet and a water outlet;

Power module

Input module

The MCU control module is electrically connected to the electric fan, the water pump, the power module, the input module, the first temperature sensor 10, the second temperature sensor 11, and the pressure sensor 12;

a water mist jet tube set, which is fixed inside the air deflector end of the flow channel, is composed of a plurality of nozzles 5, each nozzle 5 is correspondingly mounted on the water mist jet tube 6;

a water pipe 7 having one end connected to the water outlet provided by the water pump and the other end connected to the water mist jet pipe 6;

A nozzle group, which is fixed inside the air deflector end of the flow passage, is composed of a plurality of nozzles 5, each of which is correspondingly mounted on the water mist jet tube.

In order to eliminate the "dry point" on the recirculation zone of the cooling gas stream and the condenser, the cooling effect is further reduced from the second region where the condenser is installed to the electric fan end into a circular duct.

In order to facilitate the disassembly and assembly, the air deflector 2 is connected to the shroud 1 by a snap structure or by bolts.

The flow channel is divided into a first region for installing the electric fan 3, a second region for mounting the condenser 4, and a third region for mounting the nozzle group from the electric fan end to the air deflector end. .

The jet 5 is jetted at an appropriate angle to the condenser coil.

In order to be able to control the water pressure more accurately, the pressure sensor is installed at a water outlet provided by the water pump 8, and the pressure sensor is electrically connected to the MCU control module 9. The pressure sensor is used to detect the water pressure value after the water pump 8 is pressurized, which is beneficial to the condenser 4 to perform cooling work in a more energy-saving manner.

As shown in FIG. 3, the condenser heat dissipation enhancement device control method of the compression refrigerator has the following steps:

A1, the MCU control module 9 determines whether the compression chiller is turned on, if it is transferred to step A2;

A2, the first temperature sensor 10 and the second temperature sensor 11 respectively detect the temperature of the refrigerant at the inlet and outlet of the condenser 4, and proceeds to step A3;

A3, the MCU control module 9 receives the temperature signals of the first temperature sensor 10 and the second temperature sensor 11, and the processor built in the MCU control module 9 analyzes and determines the temperature signal, if the temperature is lower than the preset low temperature line, Then transfer to A4, if the temperature is higher than the low temperature line, and lower than the highest preset temperature line, then transfer to A5, if the temperature is higher than the highest preset temperature line, then transfer to A6;

A4, the MCU control module 9 sends an air cooling signal to the electric fan 3, and the electric fan 3 starts to run;

A5, the MCU control module 9 sends a water-cooling signal to the water pump 8, the water pump 8 is normally operated, and the MCU control module 9 sends an air-cooling signal to the electric ventilator 3, and the electric ventilator 3 operates normally;

A6, the MCU control module 9 sends an enhanced water cooling signal to the water pump 8, the water pump 8 accelerates the operation to enhance the water pressure, and the MCU control module 9 sends an enhanced air cooling signal to the electric fan 3, and the electric fan 3 accelerates. The operation increases the flow rate.

After the air conditioning system is turned on, the electronic control system starts the compressor, the refrigerant enters the condenser 4 in a high temperature and high pressure state, and the electric ventilator 3 installed in the flow channel starts to draw air, and the water pump 8 delivers the water through the water pipe 7 to the water mist at an appropriate pressure. The jet tube 6 is ejected from the nozzle 5 to form a water mist jet. Since the condenser 4 is wrapped by the air hood 1 and the air deflector 2, a low pressure region smaller than the ambient air pressure is formed in the air hood 1, and the outer portion is formed. The air is forced to be accelerated by the air baffle 2 under the pressure difference and mixed with the water mist jet, and uniformly guided to the entire condenser 4, the water mist forms a very thin water film in the condenser 4, the condenser 4 The heat of the refrigerant is absorbed by the air and water mist jets blown by the combined effects of conduction, evaporation, radiation and convection and discharged into the atmosphere by the electric fan 3, and the temperature and pressure of the refrigerant are lowered to an appropriate level, after the pipeline and The throttle valve enters the evaporator and exchanges heat with the medium that needs to be cooled, and then flows into the inlet end of the compressor in a gaseous state to enter the next cycle.

The electronic control system compares the refrigerant temperature signal detected by the first temperature sensor 10 at the inlet end of the condenser and the second thermal sensor 11 at the outlet end received by the MCU control module 9 with the program setting value in the MCU control module 9, and issues The control signal increases or decreases the rotational speed of the electric ventilator 3, and controls the flow rate of the water pump 8 in the same manner to achieve the purpose of ensuring that the refrigerant temperature is within the ideal operating temperature range and maximizing water saving and power saving.

When the ambient temperature is low, the temperature of the refrigerant detected by the first temperature sensor 10 and the second temperature sensor 11 received by the MCU control module 9 of the electronic control system is lower than the ideal operating temperature range when compared with the programmed value, the MCU The control module 9 controls the water pump 8 to reduce the rotational speed and reduce the output flow of the water pump 8 to reduce water consumption and power consumption. When the temperature of the refrigerant detected under this condition is still lower than the ideal operating temperature range compared with the programmed value, the MCU control module 9 will stop the operation of the water pump 8, and only rely on the electric fan 3 to dissipate heat.

When the ambient temperature is high, the temperature of the refrigerant detected by the first temperature sensor 10 and the second temperature sensor 11 received by the MCU control module 9 of the electronic control system is higher than the ideal operating temperature range when compared with the programmed value, the MCU The control module 9 controls the water pump 8 to accelerate, which will increase the output flow of the water pump 8, or simultaneously increase the rotational speed of the electric ventilator 3 to improve the heat dissipation performance.

The electronic control system is characterized in that the electronic control system performs the refrigerant temperature signal detected by the first temperature sensor 10 at the inlet end of the condenser 4 and the second temperature sensor 11 at the outlet end received by the MCU control module 9 with the program setting value. In contrast, a control signal is issued to increase or decrease the rotational speed of the electric ventilator 3, and the flow rate of the water pump 8 is controlled by the MCU control module 9 to achieve the purpose of ensuring that the refrigerant temperature is within an ideal operating temperature range and maximizing water saving and power saving. .

There are two options for the installation position of the electric ventilator, and the first position is selected such that the first area component where the electric ventilator is located is installed in the Air deflector end of the shroud At this time, the electric ventilator functions as a blower, and the second position is selected as follows: the electric ventilator is installed at the other end of the air deflector of the shroud, and at this time, the electric ventilator acts as a wind pumping device. That is, the first area component in which the electric ventilator is located may be installed at one end of the flow channel or at the other end of the flow channel.

The present invention adopts the above structure The utility model has the advantages of simple structure, low cost, high reliability and low operating cost, and is used for reforming the water-cooled refrigeration unit, and replacing the heat dissipation tower and the water circulation system, the efficiency of the refrigeration system can be greatly improved, and the air cooling type is installed. In the case of a chiller, the operating efficiency and reliability in extreme environments can be greatly improved.

The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. The present invention is equally applicable to other corresponding heat sinks, and any modifications and equivalents made within the spirit and principles of the present invention. And improvements, etc., are all included in the scope of protection of the present invention.

Industrial applicability

Sequence table free content

Claims

1. The condenser heat dissipation enhancement device of the compression refrigerator is installed at a condenser coil, and the condenser coil is divided into an inlet end and an outlet end, and is characterized in that:

An electric ventilator fixed at one end of the flow passage;

2 . The condenser heat dissipation enhancement device of a compression type refrigerator according to claim 1 , wherein the flow channel is divided into a first part for installing an electric fan from the end of the electric fan to the end of the air deflector. A zone, a second zone for installing the condenser, a third zone for installing the water mist jet tube and the nozzle group.

3. The condenser heat dissipation enhancement device of a compression type refrigerator according to claim 2, wherein the flow passage is gradually contracted from the second region to the electric fan end into a circular ring.

4. The condenser heat dissipation enhancement device of a compression type refrigerator according to claim 1, wherein the air deflector is connected to the shroud by a snap structure or by bolts.

A condenser heat dissipation enhancement device for a compression type refrigerator according to claim 1, wherein an angle between said nozzle jet direction and said condenser coil end face is between 0 ° and 180 °.

6. A method for controlling a condenser heat dissipation enhancement device of a compression type refrigerator, characterized in that the steps are: