EP3112779A1 - Verfahren zur leistungsverbesserung eines kondensators eines kühlaggregats, und vorrichtung zur leistungsverbesserung eines kondensators eines kühlaggregats - Google Patents

Verfahren zur leistungsverbesserung eines kondensators eines kühlaggregats, und vorrichtung zur leistungsverbesserung eines kondensators eines kühlaggregats Download PDF

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Publication number
EP3112779A1
EP3112779A1 EP16177485.6A EP16177485A EP3112779A1 EP 3112779 A1 EP3112779 A1 EP 3112779A1 EP 16177485 A EP16177485 A EP 16177485A EP 3112779 A1 EP3112779 A1 EP 3112779A1
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EP
European Patent Office
Prior art keywords
condenser
control means
pump
refrigerant
difference
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP16177485.6A
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English (en)
French (fr)
Inventor
Franck Pasquet
Daniel Pasquet
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B2 & Co
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B2 & Co
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Publication date
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Publication of EP3112779A1 publication Critical patent/EP3112779A1/de
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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
    • F25B39/00—Evaporators; Condensers
    • F25B39/04—Condensers
    • 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
    • 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
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/041—Details of condensers of evaporative condensers
    • 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
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21162—Temperatures of a condenser of the refrigerant at the inlet of the condenser
    • 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
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21163—Temperatures of a condenser of the refrigerant at the outlet of the condenser

Definitions

  • the present invention relates to the field of cooling units or otherwise called cooling group and more particularly to the improvement of the performance of heat exchange sitting in the air condenser that composes it.
  • a refrigeration unit comprises the following organs: an evaporator, a compressor, a condenser, an expander, a circulation system, a thermodynamic fluid or refrigerant.
  • the operating principle of the refrigeration unit is as follows.
  • the refrigerant circulating inside the cold group will be the seat of phenomena modifying its state. It will undergo condensation and vaporization cycles depending on the zone of the circuit in which it circulates, this phenomenon of change of state or phase resulting in a return of heat during its condensation and a heat absorption during its vaporization.
  • the fluid vaporizes. For this, it recovers calories, for example during the cooling of merchandise or ambient air, the latent heat of vaporization being provided by the cooling medium which cools.
  • the fluid is generally constituted by a mixture composed mainly of liquid and a minor amount of vapor in proportions of, for example, 80% of liquid and 20% of vapor.
  • the fluid is generally superheated low pressure steam. It is said that he is on a dry diet.
  • an evaporator may comprise an aluminum plate stamped as a plate heat exchanger, coils with or without fins to improve the surface of the heat exchanges.
  • the compressor As for the compressor, it absorbs the vapors from the evaporator, compresses them and forces them towards the condenser, influencing also by this means, a driving force ensuring the movement of the fluid.
  • the fluid At the inlet of the compressor, the fluid is in superheated low pressure steam
  • the fluid At the outlet of the compressor, the fluid is in high pressure steam.
  • the regulator allows to lower the pressure of the refrigerant from the high pressure refrigerant leaving the condenser.
  • the fluid is under high pressure undercooled.
  • the fluid is a liquid-vapor mixture, mainly composed of liquid and a minor amount of vapor in proportions of, for example, 80% liquid and 20% vapor.
  • the circulation system it is a tubing circuit for example and not limited to copper, or stainless steel, for transferring the fluid from one organ to another circuit.
  • the refrigerant is a fluid that occurs throughout the refrigerating cycle in its liquid form, vapor, or in the form of a liquid-vapor mixture.
  • the condenser allows heat exchange between the fluid leaving the compressor, and the "cooling medium".
  • This medium can be air, water, a mixture of glycol water.
  • the medium will most often be outside air. While circulating in the condenser, the fluid will cool and gradually come to the liquid state.
  • the fluid is superheated high pressure steam.
  • the fluid At the outlet of the condenser, the fluid is in high pressure liquid under cooled.
  • Air condensers are the most frequently encountered for low and medium capacity cooling installations.
  • the cooling medium is the air available in the immediate environment of the condenser. The energy performance of the whole will therefore depend on the amount of calories exchanged from the condenser to the ambient air. It is therefore immediately understood that the higher the ambient air temperature, the worse will be the heat exchange, which lowers the overall efficiency of the installation.
  • a fogger comprises at least the following organs: a water supply, a pump motor unit, a misting ramp comprising at least one nozzle, tubings connecting the various members to each other.
  • misting device such as a water softener, a particulate filter, a bacteria destroyer, a regulator, a reflux circuit, a pressure gauge, a control device and / or servo, a ramp solenoid valve.
  • the operating principle of the fogger is as follows.
  • the water to be emitted by the fogger is supplied to a pump driven by a motor, the assembly of which is called the pump motor unit.
  • Water is put under pressure by the pump, whose flow rate is regulated by the speed of rotation of the engine.
  • the pressurized water is injected into a tubing system connecting the pump to a misting ramp.
  • the misting ramp comprises one or more nozzles of diameter at the water outlet, for example and in a nonlimiting manner, from a few microns to some 1/10 of a millimeter.
  • the water supply connects the entire misting device to a source of water that may be mains water or reclaimed water.
  • the pump motor unit allows the distribution of water to the misting system (s). It regulates the desired water flow in the misting network and allows the pressurization of water. It comprises at least one motor and one pump, the motor driving the axis of the pump. The motor can be controlled and controlled by a control member to vary the pressure and the desired flow rate at the pump outlet
  • the misting ramp allows the implantation of the nozzles in number and according to a spacing calculated according to the desired flow rate. It comprises at least one nozzle. It may be metal, for example and without limitation, stainless steel or nylon.
  • the nozzles are components pierced on each side. They are attached in a sealed manner to the misting ramp.
  • the orifice of the nozzle in contact with the misting ramp has a bore allowing the entry of water flowing in the ramp.
  • a spray orifice of a few microns to a few tenths of a millimeter allows the water to exit in the form of droplets of water mist.
  • the tubings allow the transfer of water from one organ to another of the device.
  • the pipes may be non-limiting metal such as for example stainless steel, or synthetic material such as for example a reinforced nylon.
  • the water softener makes it possible to reduce the limescale content of the water which could eventually clog the spray orifice of the nozzles.
  • the particulate filter removes solid particles in the water which could clog the spray nozzle ports.
  • the particulate filter is dimensioned according to the orifice of the nozzles, it may for example and without limitation being composed of a sand filter, a membrane filter, pleated filter devices or heat-welded filters. polypropylene.
  • the anti organic filter is designed to destroy living organisms that may be contained in water such as algae or bacteria.
  • the anti-organic filter may be composed, for example and without limitation, by a UV lamp device.
  • the regulator is used to regulate the flow and pressure of the water at the outlet of the pump. It can be mechanical, or motorized. In the latter case, it can be controlled by a steering unit.
  • the reflux circuit provided with an anti-return valve makes it possible to reinject a quantity of water at the pump outlet towards the upstream of the pump, when the flow rate at the pump outlet is greater than the desired flow rate at the outlet of the pump. the entire nozzle arrangement.
  • the manometer is used to check the water pressure parameters at the pump outlet.
  • This body can be connected to a control device so that the latter can have knowledge of this information.
  • the control member comprises a control member receiving logs via a programming. It can also include a didactic screen giving information or to navigate the program.
  • the ramp solenoid valve makes it possible to open or not the water supply of a ramp according to the instructions given by the control member.
  • the performance of a refrigeration unit using an air condenser depends on the performance of the condenser to cool the refrigerant. For example, by summer temperature, the need for cold production will generally be greater, while the outside air will itself be warmed by the season.
  • the document CN103557643 teaches a device and a method for improving the performance of a compression chiller condenser, the device comprising at least one fan, a fogger comprising a ramp, nozzles, a motorized water pump and equipped with a pressure switch to control the flow of water in the ramp, temperature sensors attached to the inlet and the outlet of the condenser, the fan, the water pump, the pressure switch and the temperature sensors being controlled by a microcontroller implementing an algorithm using the signals provided by the temperature sensors and the pressure switch to improve the performance of the condenser.
  • the temperature control algorithm is unreliable and can lead to situations of blockage or malfunction of the performance enhancement device thus causing a decrease in the performance of the condenser or refrigerator including the condenser.
  • the present invention proposes to overcome one or more disadvantages of the prior art and in particular to provide a control method for improving the heat exchange in a cold group condenser, by regulating and controlling a misting system. disposed opposite the condenser.
  • the standby step on the operation of the fan comprises a step of monitoring by the control means of the operating state of at least one fan during a monitoring mode of the control means.
  • the monitoring step is implemented by a binary operation detection device arranged at the power supply of the fan, the detection device sending to the control means a signal representative of the requested state or not the fan.
  • the monitoring step is carried out by sending to the control means by the cold group a signal representative of the requested state or not of the fan.
  • the cooling unit comprises at least two condensers connected in series and at least two misting ramps, each disposed with respect to each condenser, each of condensers having at their ends sensors, temperature or measurement of a parameter relating to the thermal exchanges of the fluid, measuring the input and output monitoring parameters of the refrigerant included in each of the condensers, at least two fans, at the minus two solenoid valves, each dedicated to a ramp, at least one pump comprising a pressure switch seeking to ensure the maintenance of a constant pressure in the nebulization ramps, the operation of said ramps being controlled independently by the control means implementing for each condenser, the method for improving the performance of a condenser.
  • the device can operate according to the method of improving the performance of a condenser, said method using as temperature-dependent monitoring parameter the temperature of the refrigerant circulating in the condenser or any other monitoring parameter said fluid accounting for heat exchange phenomena sitting in the condenser.
  • the device comprises a communication device for updating the instructions and / or the data contained in the memory of the control means and / or recovering the data from said control means for analyzing the operation of the device for improving the performance of the condenser, the communication and data exchanges taking place via General Packet Radio Service (GPRS) and / or Ethernet and / or Wifi.
  • GPRS General Packet Radio Service
  • the invention relates to a method for improving the performance of a condenser of a refrigeration unit in which a refrigerant circulates.
  • a cold group represented on the figure 1 , generally comprises an evaporator (A), a compressor (B), a condenser (C), an expander (D), a circulation system (E), a thermodynamic fluid or refrigerant (F) circulating in the system ( E) circulation.
  • the cold group of the invention comprises at least one condenser (C), at least one fan (V) capable of promoting heat exchange between the ambient air and the condenser (C).
  • the refrigeration unit of the invention further comprises a water mist.
  • the fogger comprises at least one ramp (1) having ejection nozzles (6) arranged along the ramp or ramps.
  • the water misting device further comprises at least one pump motor unit (2) adapted to regulate the flow of water supplied to the nozzles (6).
  • fogger may comprise a solenoid valve (3) able to close or open the water supply of the nozzles of the fogger (1).
  • the fogger may comprise a solenoid valve per ramp.
  • the pump (2) and the possible solenoid valve (3) are controlled by means (5) control or otherwise called control means and / or control.
  • the fogger may comprise one or more pumps controlled by the control means (5).
  • the fogger may comprise one or more solenoid valves controlled by the control means.
  • the cooling unit with air condenser (C) is intended, for example, to cool a building and / or facilities requiring the production of cold such as a refrigeration unit to produce a positive or negative cold.
  • the refrigeration unit comprises at least two temperature sensors (4a, 4b) or, in general, for measuring a parameter P of the refrigerant (F), which accounts for the heat exchanges located in the condenser, installed at the input and output of the condenser (C).
  • the parameter for monitoring the operation of the device is then either the temperature of the refrigerant (F) or, in a general manner, a parameter P of said fluid (F) accounting for the heat exchanges in the condenser.
  • the parameter P may be the mass heat transfer coefficient of the fluid or in particular its temperature. It should be noted, moreover, that the two parameters (T and P) are correlated.
  • the first sensor (4a) located at the inlet of the condenser (C) makes it possible to measure either a temperature Te generated by the temperature of the refrigerant which is at high superheated pressure or a parameter Pe relating to the heat exchange of said refrigerant.
  • the measured temperature Te may be the same temperature of the refrigerant in the case of an in situ probe or the measured parameter Pe may be that same of said refrigerant.
  • the temperature Te measured is the temperature measured on the surface of the pipe (E) conveying the refrigerant or the parameter Pe measured is that raised on the surface of the pipe carrying said refrigerant.
  • the second sensor (4b) located at the outlet of the condenser (C) makes it possible to measure either a temperature Ts of the refrigerant which is under sub-cooled high pressure or a parameter Ps relative to the heat exchange of said refrigerant.
  • the temperature Ts may be the same temperature of the refrigerant in the case of an in situ probe or the measured parameter Ps may be the same as said refrigerant.
  • the measured temperature Ts is the temperature measured at the surface of the pipe (E) conveying the refrigerant or the measured PE is that raised on the surface of the pipe carrying said refrigerant.
  • the control means (5) monitors the operation of the fan (s) (V). This monitoring may be performed in a non-limiting manner by one or more binary operation detection devices (not shown) which detect the power supply or the non-power supply of the fan or fans (V).
  • the at least one binary operation detection device is arranged at the power supply of each fan (V) of the condenser (C). This detector makes it possible to know if the fan (V) is in stop or in running. This detector can be a dry contact.
  • These detectors are capable of storing and / or sending to the control means (5) a signal representative of the state of the solenoid or fans (V) or not.
  • a fan (V) is biased when it is electrically powered to turn the blades of the fan (V).
  • one or more operation detection devices are disposed at the compressor (B) power supply. This detector makes it possible to know if the compressor (B) is working and by therefore, it transfers refrigerant from the overheating zone to the desuperheating zone.
  • this monitoring is carried out by sending to the means of control by the cold group of a signal representative of the requested state or not of the fan.
  • the pump (2) is equipped with an inverter which controls the rotational speed of the motor and thus the flow rate of the pump.
  • the control means (5) thus controls the pump controller (2) and optionally the opening and / or closure of the solenoid valve (s) (3) as a function of information from the condenser (C), the first and second sensors (4a, 4b) and operating detectors of the fan or fans.
  • the control means (5) may comprise a thermometer which indicates to the control means the temperature of the ambient air.
  • the sensor (4a) of temperature or measurement in general, a parameter P of the refrigerant (F) accounting for heat exchange sitting in the condenser, at the inlet of the condenser (C), the temperature sensor (4b) or parameter P relative to the heat exchange of the fluid at the outlet of the condenser (C), the device for detecting the binary operation of the fan (V), the motor controller of the pump, any solenoid valves (3) ) and the thermometer are connected to the control means (5).
  • the connection of these various organs to the control means (5) can be wired. It can also be wireless with, for example, a system of transmitters and receivers for conveying the information sought to the means (5) of control via wave frequency.
  • the water misting device comprises at least one misting ramp (1) comprising at least one nozzle (6) capable of generating a mist (7) of water.
  • the fogger is disposed in a region outside the condenser (C). Its arrangement is performed in such a way that the fan (V) does not produce a draft preventing the penetration of the mist (7) of water produced by the nozzle (s) (6) of the fogger.
  • the fogger is connected to the pump (2) via tubings (8).
  • the nozzles (6) of the fogger eject a mist (7) of water in a mixing zone (Z) opposite the direction of the condenser (C).
  • this zone (Z) of mixing the fog (7) of water and ambient air mix.
  • the mixture created in the zone (Z) of mixture is sucked by the fan or fans (V) arranged on the other side of the condenser (C) relative to the nozzles (6) so that the mixture passes through the condenser (C).
  • the fan or fans accelerate and promote the passage of the mixture through the condenser (C).
  • the mist can generally be included in the mist such as a softener (200) of water, a filter ( 201), a destructor (202) of bacteria, a regulator (203), a pressure gauge (204).
  • the pump (2) may comprise a reflux circuit (205).
  • the nozzles (6) can be oriented over the entire periphery of the spray bar (1), allowing the diffusion of a water mist in any desired direction.
  • the pump (2) and the possible solenoid valve (3) are controlled by the control means (5).
  • the control means (5) makes it possible to decide whether a pump should be started according to the operating conditions of the condenser (C). It also makes it possible to decide the water flow at the pump outlet (2) according to the operating conditions of the condenser (C). It also makes it possible to decide on the opening or closing of one or more solenoid valves (3) located upstream of the misting ramps if the misting device comprises one or more solenoid valves.
  • the control means (5) comprises at least one memory and a processor.
  • the processor is able to implement an algorithm stored in the memory of the control means.
  • the algorithm implementing the following steps of the procedure:
  • the process represented on Figures 3A (3B) to 5A (5B), comprises a step (10) of standby on the operation of the fan.
  • the step (10) of standby on the operation of the fan comprises a step (11) of monitoring by the control means of the operating state of at least one fan during a monitoring mode of the means of control.
  • monitoring is performed by a binary operation detection device disposed at the power supply of the fan.
  • the device sends the control means a signal representative of the requested state or not the fan or fans.
  • the fan may stop working or be solicited at a time tf. tf represents the moment when a fan stops being solicited.
  • the monitoring is carried out by sending to the control means by the cold group of a signal representative of the requested state or not of the fan.
  • the method comprises a step of calculation by the processor of a first difference (Te-Ts) between, on the one hand, a temperature Te at the moment to the refrigerant at the inlet of the condenser measured by a first temperature sensor and on the other hand, a temperature Ts at the moment to refrigerant at the outlet of the condenser measured by a second temperature sensor.
  • a first difference Te-Ts
  • the algorithm implements a step of the fogging timer.
  • the algorithm returns to the standby step (10), otherwise the method includes a step of modulating the water flow rate provided by the pump (2) to the fogger (1) to a step (16) for stopping the fogger (1).
  • the process comprises a step of calculation by the processor of a first difference (Pe-Ps) between, on the one hand, a parameter Pe relating to the heat exchange, at the instant to, of the refrigerant at the inlet of the condenser measured by a first sensor and, secondly, a parameter Ps relating to the heat exchange, at time to, of the refrigerant at the outlet of the condenser measured by a second sensor.
  • Pe-Ps a first difference between, on the one hand, a parameter Pe relating to the heat exchange, at the instant to, of the refrigerant at the inlet of the condenser measured by a first sensor and, secondly, a parameter Ps relating to the heat exchange, at time to, of the refrigerant at the outlet of the condenser measured by a second sensor.
  • the algorithm implements a step of the fogging timer.
  • the algorithm returns to the standby step (10), otherwise the method includes a step of modulating the water flow rate provided by the pump (2) to the fogger (1) to a step (16) for stopping the fogger (1).
  • the fogging timer step comprises the following steps.
  • the control means starts a time delay ixtemp, in which i is a natural integer between zero and infinity and temp a time interval.
  • FIGS. 6A , 7A and 8A represent the process flow diagram with i equal to zero.
  • the means (5) of control sends (14) to the pump (2) a signal for supplying water to the fogger (1) at a maximum setpoint flow rate DO and, if the fogger comprises one or more solenoid valves, at least one solenoid valve a signal d opening of the solenoid valve, otherwise the control means returns to the step (10) monitoring.
  • the fan (V) is always loaded at the moment to + ixtemp, if the instant tf is not less than to + ixtemp.
  • the processor calculates (17.0) a second difference (Tsi-Ts (i + 1)) between, d firstly, the temperature Tsi of the refrigerant at the outlet of the condenser (C) at the moment to + ixtemp measured by the second temperature sensor (4b) and secondly the temperature Ts (i + 1) of the refrigerant in condenser outlet (C) at time to + (i + 1) ⁇ temp measured by the second temperature sensor (4b), otherwise the algorithm implements the step (16) for stopping the mist.
  • the fan (V) is always biased at time to + (i + 1) ⁇ temp, if the instant tf is not between the instant to + ixtemp and the moment to + (i + 1) ⁇ temp.
  • the control means sends (19.1) to the pump (2) a signal allowing the fogger water supply ( 1) according to a maximum setpoint flow rate OD, otherwise the control means sends (18.1) to the pump (2) a signal allowing the water supply of the misting device (1) at a flow rate D1 of a setpoint lower than the value OD of maximum setpoint.
  • the fogging timer step comprises the following steps.
  • the control means starts a time delay ixtemp, in which i is a natural integer between zero and infinity and temp a time interval.
  • the means (5) of control sends (14) to the pump (2) a signal for supplying water to the fogger (1) at a maximum setpoint flow rate DO and, if the fogger comprises one or more solenoid valves, at least one solenoid valve a signal d opening of the solenoid valve, otherwise the control means returns to the step (10) monitoring.
  • the fan (V) is always loaded at the moment to + ixtemp, if the instant tf is not less than to + ixtemp.
  • the processor calculates (17.0) a second difference (Psi-Ps (i + 1)) between, d firstly, the parameter Psi relating to the heat exchange of the refrigerant at the outlet of the condenser (C) at the moment to + ixtemp measured by the second sensor (4b) and, secondly, the parameter Ps (i + 1) relating to the heat exchange of the refrigerant at the outlet of the condenser (C) at time to + (i + 1) ⁇ temp measured by the second sensor (4b), otherwise the algorithm implements step (16) of Stopping the fogger.
  • the fan (V) is always biased at time to + (i + 1) ⁇ temp, if the instant tf is not between the instant to + ixtemp and the moment to + (i + 1) ⁇ temp.
  • the control means sends (19.1) to the pump (2) a signal allowing the water supply of the mist ( 1) according to a maximum setpoint rate OD, otherwise the control means sends (18.1) to the pump (2) a signal enabling the fogger (1) to be supplied with water at a flow rate D1 that is lower than the maximum setpoint value OD.
  • the fogging timer step comprises the following steps.
  • the control means starts a timer ixtemp, in which i is a natural integer between zero and infinity and temp a time interval.
  • i is a natural integer between zero and infinity and temp a time interval.
  • the Figures 9A and 10A represent the flow chart of the method according to the second embodiment with i equal to zero.
  • the means (5) control sends (14 ') to the pump (2) a signal allowing the water supply of the fogger (1) at a minimum flow Dn and, if the fogger comprises one or more solenoid valves, the solenoid valve a signal opening of the solenoid valve, otherwise the control means returns to the step (10) monitoring.
  • the fan (V) is always loaded at the moment to + ixtemp, if the instant tf is not less than to + ixtemp.
  • the processor calculates (17.0') a second difference (Tsi-Ts (i + 1)) between, on the one hand, the temperature Tsi of the refrigerant at the outlet of the condenser (C) at the moment to + ixtemp measured by the second temperature sensor (4b) and, secondly, the temperature Ts (i + 1) of the fluid refrigerant at the outlet of the condenser (C) at time to + (i + 1) ⁇ temp measured by the second temperature sensor (4b), otherwise the algorithm implements the step (16 ') of stopping the fogger.
  • the fan (V) is always biased at time to + (i + 1) ⁇ temp, if the instant tf is not between the instant to + ixtemp and the moment to + (i + 1) ⁇ temp.
  • the control means sends (19.1 ') to the pump (2) a signal allowing the fogger water supply. (1) according to a setpoint flow rate D (n-1) greater than the minimum setpoint value Dn, otherwise the control means sends (18.1 ') to the pump (2) a signal allowing the water supply of the fogger according to a flow Dn.
  • the fogging timer step comprises the following steps.
  • the control means starts a timer ixtemp, in which i is a natural integer between zero and infinity and temp a time interval.
  • i is a natural integer between zero and infinity and temp a time interval.
  • the Figures 9B and 10B represent the flow diagram of the method according to the other second embodiment with i equal to zero.
  • the means (5) control sends (14 ') to the pump (2) a signal allowing the water supply of the fogger at a flow Dn of minimum setpoint and, if the fogger comprises one or more solenoid valves, the solenoid valve an opening signal of the solenoid valve, otherwise the control means returns to the monitoring step (10).
  • the fan (V) is always loaded at the moment to + ixtemp, if the instant tf is not less than to + ixtemp.
  • the processor calculates (17.0') a second difference (Psi-Ps (i + 1)) between, on the one hand, the parameter Psi relating to the heat exchange of the refrigerant at the outlet of the condenser (C) at the moment to + ixtemp measured by the second sensor (4b) and, on the other hand, the parameter Ps (i + 1) relating to the heat exchange of the refrigerant at the outlet of the condenser (C) at time to + (i + 1) ⁇ temp. measured by the second sensor (4b), otherwise the algorithm implements the step (16 ') of stopping the fogger.
  • the fan (V) is always biased at time to + (i + 1) ⁇ temp, if the instant tf is not between the instant to + ixtemp and the moment to + (i + 1) ⁇ temp.
  • the control means sends (19.1 ') to the pump (2) a signal allowing the fogger water supply (1) according to a setpoint flow rate D (n-1) greater than the minimum setpoint value Dn, otherwise the control means sends (18.1 ') to the pump (2) a signal allowing the water supply of the fogger according to a flow Dn.
  • the step of modulating the flow of water supplied by the pump to the misting machine comprises the following steps by incrementing the natural number i until the step of stopping the mist.
  • the Figures 6A to 8A represent the method according to the first embodiment with i equal to zero.
  • the fan (V) is still solicited or if a recalculation of the first difference (Te (i + 1) -Ts (i + 1)) is less at the first reference value Vc, then the processor recalculates (17.1) the second difference (Ts (i + 1) -Ts (i + 2)), otherwise the algorithm implements the step (16) of stopping fogger.
  • the fan (V) is always biased at time to + (i + 2) xtemp, if the instant tf is not between the instant to + (i + 1) ⁇ temp and the moment to + (i + 1) i + 2) xtemp.
  • the recalculation of the first difference (Te (i + 1) -Ts (i + 1)) is the difference between, on the one hand, the temperature of the refrigerant at the inlet of the condenser at time to + (i + 1) ) ⁇ temp measured by the first temperature sensor (4a) and secondly the refrigerant temperature at the outlet of the condenser at time to + (i + 1) ⁇ temp measured by the second temperature sensor (4b) ,
  • the recalculation of the second difference is the difference between, on the one hand, the temperature of the refrigerant at the outlet of the condenser at time to + (i + 1) ) ⁇ temp measured by the second temperature sensor (4b) and secondly the temperature of the refrigerant at the outlet of the condenser at the instant to + (i + 2) xtemp measured by the second temperature sensor (4b),
  • the control means sends (19.2) to the pump (2) a signal allowing the water supply of the fogger (1) at a flow rate equal to the previous setpoint flow, otherwise the control means sends (18.2) to the pump a signal allowing the fogger water supply at a setpoint flow rate lower than the previous setpoint flow.
  • the fan (V) is still solicited or if a recalculation of the first difference (Te (i + 2) -Ts (i + 2)) is less at the first reference value Vc, then the processor recalculates (17.2) the second difference (Ts (i + 2) -Ts (i + 3)), otherwise the algorithm implements the step (16) of stopping fogger.
  • the fan (V) is always biased at time to + (i + 3) xtemp, if the instant tf is not between the instant to + (i + 2) xtemp and the instant to + (i 3) xtemp.
  • the recalculation of the first difference is the difference between, on the one hand, the temperature of the refrigerant at the inlet of the condenser at time to + (i + 2) ) xtemp measured by the first sensor (4a) temperature and secondly the temperature of the refrigerant at the outlet of the condenser at time to + (i + 2) xtemp measured by the second temperature sensor (4b),
  • the recalculation of the second difference is the difference between, on the one hand, the temperature of the refrigerant at the outlet of the condenser at time to + (i + 2) ) xtemp measured by the second temperature sensor (4b) and secondly the temperature of the refrigerant at the outlet of the condenser at time to + (i + 3) xtemp measured by the second temperature sensor (4b),
  • the control means sends the pump (2) a signal enabling the fogger to be supplied with water at a flow rate equal to the previous setpoint flow, otherwise the means control sends a signal to the pump allowing the water supply of the fogger at a setpoint flow rate lower than the previous setpoint flow.
  • the step of modulating the flow of water supplied by the pump to the misting machine comprises the following steps by incrementing the natural number i until the step of stopping the mist.
  • the Figures 6B to 8B represent the method according to the other first embodiment with i equal to zero.
  • the fan (V) is still solicited or if a recalculation of the first difference (Pe (i + 1) -Ps (i + 1)) is less at the first reference value Vc, then the processor recalculates (17.1) the second difference (Ps (i + 1) -Ps (i + 2)), otherwise the algorithm implements the step (16) of stopping fogger.
  • the fan (V) is always biased at time to + (i + 2) xtemp, if the instant tf is not between the instant to + (i + 1) ⁇ temp and the moment to + (i + 1) i + 2) xtemp.
  • the recalculation of the first difference (Pe (i + 1) -Ps (i + 1)) is the difference between, on the one hand, the parameter Pe relating to the heat exchange of the refrigerant at the inlet of the condenser at the instant to + (i + 1) ⁇ temp measured by the first measurement sensor (4a) and, on the other hand, the parameter Ps relating to the heat exchange of the refrigerant at the outlet of the condenser at time to + (i + 1) ⁇ temp measured by the second measurement sensor (4b),
  • the recalculation of the second difference is the difference between, on the one hand, the parameter relative to the heat exchange of the refrigerant at the outlet of the condenser at the instant to + (i + 1) ⁇ temp measured by the second measurement sensor (4b) and, on the other hand, the parameter relating to the heat exchange of the refrigerant at the outlet of the condenser at the instant to + (i + 2) xtemp measured by the second measurement sensor (4b).
  • the control means sends (19.2) to the pump (2) a signal allowing the water supply of the fogger (1) at a flow rate equal to the previous setpoint flow, otherwise the control means sends (18.2) to the pump a signal allowing the fogger water supply at a setpoint flow rate lower than the previous setpoint flow.
  • the fan (V) is still solicited or if a recalculation of the first difference (Pe (i + 2) -Ps (i + 2)) is less at the first reference value Vc, then the processor recalculates (17.2) the second difference (Ps (i + 2) -Ps (i + 3)), otherwise the algorithm implements the step (16) of stopping fogger.
  • the fan (V) is always biased at time to + (i + 3) xtemp, if the instant tf is not between the instant to + (i + 2) xtemp and the instant to + (i 3) xtemp.
  • the recalculation of the first difference is the difference between, on the one hand, the parameter relating to the heat exchange of the refrigerant at the inlet of the condenser at time to + (i + 2) xtemp measured by the first measurement sensor (4a) and, on the other hand, the parameter relating to the heat exchange of the refrigerant at the outlet of the condenser at the moment to + (i + 2) xtemp measured by the second sensor (4b) of measurement .
  • the recalculation of the second difference is the difference between, on the one hand, the parameter relating to the heat exchange of the refrigerant at the outlet of the condenser at the moment to + (i + 2) xtemp measured by the second measurement sensor (4b) and, on the other hand, the parameter relating to the heat exchange of the refrigerant at the outlet of the condenser at time to + (i + 3) xtemp measured by the second measurement sensor (4b).
  • the control means sends the pump (2) a signal enabling the fogger (1) to be supplied with water at a flow rate equal to the previous setpoint flow, otherwise the control means sends to the pump a signal for supplying the mist water supply at a setpoint flow rate lower than the previous setpoint flow.
  • the step of modulating the water flow rate supplied by the pump to the misting device comprises the following steps by incrementing the natural number i until the step of stopping the misting device.
  • the fan (V) is still solicited or if a recalculation of the first difference (Te (i + 1) -Ts (i + 1)) is less than the first value Vc of setpoint, then the processor recalculates (17.1) the second difference (Ts (i + 1) -Ts (i + 2)), otherwise the algorithm implements step (16 ') d Stopping the fogger.
  • the fan (V) is always biased at time to + (i + 2) xtemp, if the instant tf is not between the instant to + (i + 1) ⁇ temp and the moment to + (i + 1) i + 2) xtemp.
  • the recalculation of the first difference (Te (i + 1) -Ts (i + 1)) is the difference between, on the one hand, the temperature of the refrigerant at the inlet of the condenser at time to + (i + 1) ) ⁇ temp measured by the first temperature sensor (4a) and secondly the refrigerant temperature at the outlet of the condenser at time to + (i + 1) ⁇ temp measured by the second temperature sensor (4b) ,
  • the recalculation of the second difference is the difference between, on the one hand, the temperature of the refrigerant at the outlet of the condenser at time to + (i + 1) ) ⁇ temp measured by the second temperature sensor (4b) and secondly the temperature of the refrigerant at the outlet of the condenser at the instant to + (i + 2) xtemp measured by the second temperature sensor (4b),
  • control means sends (19.2 ') to the pump (2) a signal allowing the water supply of the misting device according to a flow rate greater than the previous setpoint flow, otherwise the control means sends (18.2 ') to the pump a signal for supplying water to the fogger at a setpoint flow rate equal to the previous setpoint flow.
  • the fan (V) is still solicited or if a recalculation of the first difference (Te (i + 2) -Ts (i + 2)) is less than the first set value Vc, then the processor recalculates (17.2 ') the second difference (Ts (i + 2) -Ts (i + 3)), otherwise the algorithm implements step (16') Stopping the mist.
  • the fan (V) is always biased at time to + (i + 3) xtemp, if the instant tf is not between the instant to + (i + 2) xtemp and the instant to + (i 3) xtemp.
  • the recalculation of the first difference is the difference between, on the one hand, the temperature of the refrigerant at the inlet of the condenser at time to + (i + 2) ) xtemp measured by the first temperature sensor (4a) and on the other hand the temperature of the refrigerant at the outlet of the condenser at the moment to + (i + 2) xtemp measured by the second temperature sensor (4b),
  • the recalculation of the second difference is the difference between, on the one hand, the temperature of the refrigerant at the outlet of the condenser at time to + (i + 2) ) xtemp measured by the second temperature sensor (4b) and secondly the temperature of the refrigerant at the outlet of the condenser at time to + (i + 3) xtemp measured by the second temperature sensor (4b),
  • the control means sends the pump (2) a signal allowing the fogger to be supplied with water at a flow rate greater than the previous setpoint flow, otherwise the means control sends a signal to the pump for the water supply of the fogger at a setpoint rate equal to the previous setpoint flow.
  • the step of modulating the water flow rate supplied by the pump to the misting device comprises the following steps by incrementing the natural number i until the step of stopping the misting device.
  • the fan (V) is still solicited or if a recalculation of the first difference (Pe (i + 1) -Ps (i + 1)) is less than the first set value Vc, then the processor recalculates (17.1) the second difference (Ps (i + 1) -Ps (i + 2)), otherwise the algorithm implements step (16 ') d Stopping the fogger.
  • the fan (V) is always biased at time to + (i + 2) xtemp, if the instant tf is not between the instant to + (i + 1) ⁇ temp and the moment to + (i + 1) i + 2) xtemp.
  • the recalculation of the first difference (Pe (i + 1) -Ps (i + 1)) is the difference between, on the one hand, the parameter relating to the heat exchange of the refrigerant at the inlet of the condenser at time to + (i + 1) ⁇ temp measured by the first measurement sensor (4a) and, on the other hand, the parameter relating to the heat exchange of the refrigerant at the outlet of the condenser at time to + (i + 1) ⁇ temp. measured by the second measurement sensor (4b).
  • the recalculation of the second difference is the difference between, on the one hand, the parameter relative to the heat exchange of the refrigerant at the outlet of the condenser at the instant to + (i + 1) ⁇ temp measured by the second measurement sensor (4b) and, on the other hand, the parameter relating to the heat exchange of the refrigerant at the outlet of the condenser at the instant to + (i + 2) xtemp measured by the second measurement sensor (4b).
  • the control means sends (19.2 ') to the pump (2) a signal allowing the fogger to supply water at a flow rate greater than the previous setpoint flow rate. , otherwise the control means sends (18.2 ') to the pump a signal allowing the water supply of the fogger according to a setpoint flow equal to the previous setpoint flow.
  • the fan (V) is still solicited or if a recalculation of the first difference (Pe (i + 2) -Ps (i + 2)) is less than the first value Vc of setpoint, then the processor recalculates (17.2 ') the second difference (Ps (i + 2) -Ps (i + 3)), otherwise the algorithm implements step (16') Stopping the mist.
  • the fan (V) is always biased at time to + (i + 3) xtemp, if the instant tf is not between the instant to + (i + 2) xtemp and the instant to + (i 3) xtemp.
  • the recalculation of the first difference is the difference between, on the one hand, the parameter relating to the heat exchange of the refrigerant at the inlet of the condenser at time to + (i + 2) xtemp measured by the first measurement sensor (4a) and, on the other hand, the parameter relating to the heat exchange of the refrigerant at the outlet of the condenser at time t + (i + 2) xtemp measured by the second measurement sensor (4b).
  • the recalculation of the second difference is the difference between, on the one hand, the parameter relating to the heat exchange of the refrigerant at the outlet of the condenser at the moment to + (i + 2) xtemp measured by the second measurement sensor (4b) and, on the other hand, the parameter relating to the heat exchange of the refrigerant at the outlet of the condenser at time to + (i + 3) xtemp measured by the second measurement sensor (4b).
  • the control means sends the pump (2) a signal allowing the fogger to be supplied with water at a flow rate greater than the previous setpoint flow, otherwise the means control sends a signal to the pump for the water supply of the fogger at a setpoint rate equal to the previous setpoint flow.
  • the step (16, 16 ') of stopping the fogger (1) comprises the following steps.
  • the control means sends a signal to the pump for supplying the fogger with water at a set flow rate lower or higher than the set flow rate. previous.
  • the control means retrieves the flow setpoint values from an array stored in the memory of the control means.
  • the parameter j is a natural integer.
  • the system may furthermore, in place of a table setting values DO and Dn, include a program or algorithm included in the control means that analyzes information relating to the adiabatic diagram of water (Mollier diagram) .
  • Mollier diagram adiabatic diagram of water
  • temperature and humidity sensors will indicate to the control means the atmospheric conditions and the temperature and hygrometry of the air, said control means will then perform calculations so that the choice of the flow will lead to to avoid the phenomena of condensation, which may result from the creation of water mist by the fogger.
  • the figure 11A represents steps of the method from a flow Dj starting from a moment to + kxtemp with k a natural number and j strictly less than n according to the first embodiment.
  • the pump (2) supplies a flow Dj to the fogger and the fan (V) is solicited.
  • the processor calculates (4.0) a second difference (Tsk-Ts (k + 1)) between, d on the one hand, the temperature Tsk of the refrigerant at the outlet of the condenser (C) at the moment to + kxtemp measured by the second temperature sensor (5) and, on the other hand, the temperature Ts (k + 1) of the refrigerant in condenser outlet (C) at time to + (k + 1) ⁇ temp measured by the second temperature sensor (4b), otherwise the algorithm implements the step (3.0) of stopping mist.
  • the fan (V) is always biased at time to + (k + 1) ⁇ temp, if the instant tf is not between the instant to + kxtemp and the instant to + (k + 1) ⁇ temp.
  • the control means sends (1.2) to the pump (2) a signal allowing the water supply of the fogger according to a reference flow Dj, otherwise the control means sends (1.1) to the pump (2) a signal allowing the water supply of the misting device at a flow rate D (j + 1) setpoint lower than the value Dj maximum setpoint .
  • the temperatures measured by the temperature sensors are for example stored at least temporarily in the memory. For example, at a time to + (k + 1) ⁇ temp, the temperature Tsk of the refrigerant at the outlet of the condenser at instant to + kxtemp measured by the second temperature sensor (4b) has been stored in the memory for can measure the second difference (Tsk-Ts (k + 1)).
  • the Figure 11B represents steps of the method from a flow Dj starting from a moment to + kxtemp with k a natural number and j strictly less than n according to the first embodiment.
  • the pump (2) provides a flow Dj to the fogger (1) and the fan (V) is requested.
  • the processor calculates (4.0) a second difference (Psk-Ps (k + 1)) between, d firstly, the parameter Psk relating to the heat exchange of the refrigerant at the outlet of the condenser (C) at the moment to + kxtemp measured by the second measurement sensor (4b) and, secondly, the parameter Ps (k + 1) relating to the heat exchange of the refrigerant at the outlet of the condenser (C) at time to + (k + 1) ⁇ temp measured by the second sensor (4b) of measurement, otherwise the algorithm implements the step (3.0) shutdown of the fogger.
  • the fan (V) is always biased at time to + (k + 1) ⁇ temp, if the instant tf is not between the instant to + kxtemp and the instant to + (k + 1) ⁇ temp.
  • the control means sends (1.2) to the pump (2) a signal allowing the water supply of the fogger according to a reference flow Dj, otherwise the control means sends (1.1) to the pump (2) a signal allowing the water supply of the misting device at a flow rate D (j + 1) setpoint lower than the value Dj maximum setpoint .
  • the parameters Psk relating to the heat exchange of the refrigerant measured by the measurement sensors are stored at least temporarily in the memory. For example, at a time to + (k + 1) ⁇ temp, the parameter Psk relating to the heat exchange of the refrigerant at the outlet of the condenser at instant to + kxtemp measured by the second sensor (4b) of measurement has been memorized in the memory to be able to measure the second difference (Psk-Ps (k + 1)).
  • the cooling unit comprises at least two condensers (C) connected in series and at least two misting ramps (1), each arranged in front of each condenser (C), each of the condensers (C) having at its ends sensors (4a, 4b), temperature or measurement of a parameter P relating to the heat exchange of the refrigerant (F), measuring the input and output monitoring parameters of the refrigerant (F) included in each of the condensers (C), at least two fans (V), at least two solenoid valves (3), each dedicated to a ramp (1), at least one pump (2) comprising a pressure switch seeking to maintain a pressure constant in the ramps (1), the operation of said ramps (1) being controlled independently by the control means (5) implementing for each condenser (C), the method for improving the performance of a condenser (C).
  • the system may comprise two condensers (C) and two ramps (1), with one of the ramps (1) at rest and the other ramp (1) in operating condition, the water flow in the ramps (1) being controlled by a common pump (2). If the ramp (1) at standstill starts, in turn, to operate, there will be a pressure drop in the first ramp (1), the two ramps (1) being fed by the same pump (2) . The pressure drop in the first ramp (1) activates the pressure switch, included in the pump (2), which then regulates the pressure and therefore the flow rate in said ramp (1) to maintain it at the set values defined in the processor of the means (5) control.
  • the control means may comprise a program or algorithm for analyzing information relating to the adiabatic water diagram (Mollier diagram) and perform calculations, so that the choice of the flow leads to avoiding the condensation phenomena, which may result from the creation of water mist by the fogger.
  • the device comprises a communication device for updating the instructions and / or the data contained in the memory of the control means (5) and / or recovering data from said control means (5) for analysis of the operation of the device for improving the performance of the condenser (C), the communication and data exchange taking place via General Packet Radio Service (GPRS) and / or Ethernet and / or Wifi.
  • GPRS General Packet Radio Service

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
EP16177485.6A 2015-07-03 2016-07-01 Verfahren zur leistungsverbesserung eines kondensators eines kühlaggregats, und vorrichtung zur leistungsverbesserung eines kondensators eines kühlaggregats Withdrawn EP3112779A1 (de)

Applications Claiming Priority (1)

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FR1556339A FR3038370B1 (fr) 2015-07-03 2015-07-03 Procede d'amelioration de la performance d'un condenseur d'un groupe de froid et dispositif d'amelioration de la performance d'un condenseur d'un groupe de froid

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112889652A (zh) * 2021-01-26 2021-06-04 深圳市蔬心宝科技有限公司 雾化风扇的控制方法以及控制系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028906A (en) 1975-07-14 1977-06-14 Charles E. Upchurch Fogging device for cooling a condenser coil
US4974422A (en) 1990-03-08 1990-12-04 Vilter Manufacturing Corporation Evaporative condenser with fogging nozzle
CN103557643A (zh) 2013-10-23 2014-02-05 珠海风合节能科技开发有限公司 压缩式制冷机的冷凝器散热增强装置及其控制方法
CN104101137A (zh) * 2014-07-28 2014-10-15 上海伏波环保设备有限公司 空冷冷凝器的相变辅助冷却装置及空冷冷凝器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028906A (en) 1975-07-14 1977-06-14 Charles E. Upchurch Fogging device for cooling a condenser coil
US4974422A (en) 1990-03-08 1990-12-04 Vilter Manufacturing Corporation Evaporative condenser with fogging nozzle
CN103557643A (zh) 2013-10-23 2014-02-05 珠海风合节能科技开发有限公司 压缩式制冷机的冷凝器散热增强装置及其控制方法
CN104101137A (zh) * 2014-07-28 2014-10-15 上海伏波环保设备有限公司 空冷冷凝器的相变辅助冷却装置及空冷冷凝器

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112889652A (zh) * 2021-01-26 2021-06-04 深圳市蔬心宝科技有限公司 雾化风扇的控制方法以及控制系统
CN112889652B (zh) * 2021-01-26 2022-08-09 深圳市蔬心宝科技有限公司 雾化风扇的控制方法以及控制系统

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