CN114353390A - Double-evaporator system for realizing constant temperature and constant humidity and temperature and humidity adjusting method thereof - Google Patents
Double-evaporator system for realizing constant temperature and constant humidity and temperature and humidity adjusting method thereof Download PDFInfo
- Publication number
- CN114353390A CN114353390A CN202210049245.8A CN202210049245A CN114353390A CN 114353390 A CN114353390 A CN 114353390A CN 202210049245 A CN202210049245 A CN 202210049245A CN 114353390 A CN114353390 A CN 114353390A
- Authority
- CN
- China
- Prior art keywords
- evaporator
- expansion valve
- humidity
- temperature
- compressor
- 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.)
- Pending
Links
Images
Abstract
The invention discloses a double-evaporator system for realizing constant temperature and constant humidity and a temperature and humidity adjusting method thereof, which are used for solving the problems that the temperature of a data center is unstable and the temperature is easy to deviate from a control target temperature under the working conditions of low-load refrigeration and dehumidification of a machine room air conditioner of the conventional data center. The invention comprises a compressor, a condenser, a first evaporator, a second evaporator, a first electromagnetic valve, a second electromagnetic valve, a first expansion valve, a second expansion valve and a pipeline; the compressor is sequentially connected with the condenser, the first electromagnetic valve, the first evaporator, the second electromagnetic valve and the second evaporator through pipelines; a first expansion valve is connected between the condenser and the first evaporator through a pipeline and is connected with a first electromagnetic valve in parallel; a second expansion valve is connected between the first evaporator and the second evaporator through a pipeline, and the second expansion valve is connected with a second electromagnetic valve in parallel; one side of the second evaporator, which is far away from the first evaporator, is provided with a humidifier, and the humidifier is connected with a water inlet electromagnetic valve.
Description
Technical Field
The invention relates to the technical field of machine room air conditioning system design, in particular to a double-evaporator system for realizing constant temperature and constant humidity and a temperature and humidity adjusting method thereof.
Background
The data center has higher requirements on air temperature and humidity, and the higher or lower air temperature and humidity can have adverse effects on the operation of the server. Therefore, a room air conditioner is required to be matched in the data center to maintain the temperature and humidity of the data center.
When the air conditioner in the machine room performs low-load refrigeration, the frequency conversion compressor is often matched with the load by reducing the frequency, but when the load is lower than the minimum refrigerating capacity which can be provided by the compressor, the compressor enters a process of frequently starting and stopping, namely, the compressor stops when the temperature is reduced to a stop point, the compressor starts and refrigerates when the temperature is increased to a start point due to heat dissipation of the server, and the temperature of the data center is in a fluctuation state at the moment. In addition, the existing compressor for the air conditioner in the machine room is used for refrigerating, and the air quantity is reduced, so that the air outlet temperature is lower than the air dew point temperature, and the dehumidification effect is achieved. However, in the dehumidification process, the control of the compressor is not related to the temperature of the data center, the temperature of the data center cannot be adjusted, the data center may be stopped when the temperature of the data center is lower than the low-temperature alarm value, or the refrigeration capacity is offset by turning on the electric heating mode, and the actual temperature inside the data center deviates from the preset target temperature in the above processes.
Therefore, in order to solve the above problems, it is an important subject of research by those skilled in the art to find a dual evaporator system for realizing constant temperature and constant humidity and a temperature and humidity adjusting method thereof.
Disclosure of Invention
The embodiment of the invention discloses a double-evaporator system for realizing constant temperature and constant humidity and a temperature and humidity adjusting method thereof, which are used for solving the problems that the temperature of a data center is unstable and the temperature is easy to deviate from a control target temperature when a machine room air conditioner of the existing data center is in a low-load refrigeration and dehumidification working condition.
The embodiment of the invention provides a double-evaporator system for realizing constant temperature and constant humidity, which comprises:
the system comprises a compressor, a condenser, a first evaporator, a second evaporator, a first electromagnetic valve, a second electromagnetic valve, a first expansion valve, a second expansion valve and a pipeline for flowing of refrigerant;
the compressor is sequentially connected with the condenser, the first electromagnetic valve, the first evaporator, the second electromagnetic valve and the second evaporator through pipelines, and one end, far away from the second electromagnetic valve, of the second evaporator is connected with the compressor;
the condenser and the first evaporator are connected with the first expansion valve through a pipeline, and the first expansion valve is connected with the first electromagnetic valve in parallel;
a second expansion valve is connected between the first evaporator and the second evaporator through a pipeline, and the second expansion valve is connected with the second electromagnetic valve in parallel;
and a humidifier is arranged on one side of the second evaporator, which is far away from the first evaporator, and is connected with a water inlet electromagnetic valve.
Optionally, the first expansion valve and the second expansion valve are electronic expansion valves.
Optionally, an outdoor fan is disposed at the condenser.
Optionally, an indoor fan is disposed at the first evaporator.
Optionally, a suction temperature sensor is arranged on a pipeline connecting the second evaporator and the compressor.
Optionally, a suction pressure sensor is further disposed on a pipeline connecting the second evaporator and the compressor.
Optionally, the humidifier is an electrode humidifier, an electrothermal humidifier, a dry steam humidifier, a wet film humidifier, or a high pressure micro mist humidifier.
According to the temperature and humidity adjusting method for the double-evaporator system for realizing constant temperature and constant humidity, provided by the embodiment of the invention, when the control target is return air temperature and humidity, Tr: return air temperature, Ts: return air set temperature, Hr: return air humidity, Hs: setting the humidity of return air;
the temperature and humidity adjusting method comprises the following steps:
when Tr-Ts is larger than a, the double-evaporator system enters a refrigeration mode, the compressor is started, the first electromagnetic valve and the second electromagnetic valve are closed, the first expansion valve and the second electromagnetic valve are opened, the first expansion valve performs PI regulation according to suction superheat degree deviation, and the double-evaporator system operates normally for refrigeration;
after the compressor is started, PI regulation is carried out on the compressor according to temperature difference, when the compressor runs to the minimum preset running frequency of the compressor and Tr (n)/Tr (n-1) × 100% < B within 3min continuously, the first electromagnetic valve is opened, the second expansion valve is opened, the delay time is 5s, the first expansion valve is closed, the second electromagnetic valve is closed, the second expansion valve carries out PI regulation according to suction superheat degree deviation, and the double-evaporator system runs low-load refrigeration;
when the double-evaporator system operates low-load refrigeration for 5min continuously and Ts-Tr is greater than a, the double-evaporator system exits the refrigeration mode, the compressor is closed, and the first electromagnetic valve, the second electromagnetic valve, the first expansion valve and the second expansion valve are all closed;
the PI regulation formula of the compressor is as follows: u (k) ═ Kp [ e (k) -e (k-1) ] + e (k) × 1/Ti;
kp in the PI regulation formula of the compressor is a proportional coefficient, and Ti is integral time;
the compressor speed is equal to the current speed + u (k);
when the double-evaporator system enters a refrigeration mode, the temperature difference e (k) is equal to Tr-Ts;
the opening degree regulating PI formula of the first expansion valve and the second electronic expansion valve is as follows:
u(k)＝Kp*[e(k)-e(k-1)]+e(k)*1/Ti；
kp in the first expansion valve and the opening adjusting PI formula of the second electronic expansion valve is a proportional coefficient, and Ti is integration time;
the intake air superheat deviation e (k) is the current actual intake air superheat — the target intake air superheat.
The invention provides a temperature and humidity adjusting method for a double-evaporator system for realizing constant temperature and constant humidity, which comprises the following steps that when the control target is return air temperature and humidity, Tr: return air temperature, Ts: return air set temperature, Hr: return air humidity, Hs: setting the humidity of return air;
the temperature and humidity adjusting method comprises the following steps:
when Hr-Hs > c, the double-evaporator system enters a dehumidification mode, the compressor is started, the first electromagnetic valve and the second expansion valve are closed, the first expansion valve and the second electromagnetic valve are opened, and the first expansion valve performs PI regulation according to the suction superheat degree deviation;
after the compressor is started, PI regulation is carried out on the compressor according to humidity deviation, when Ts-Tr > B and Tr (n)/Tr (n-1) × 100% < B, a first electromagnetic valve is opened, a second expansion valve is opened, time delay is 5s, the first expansion valve is closed, the second electromagnetic valve is closed, PI regulation is carried out on the second expansion valve according to suction superheat degree deviation, and the double-evaporator system operates low-load dehumidification;
when the double-evaporator system operates for low-load dehumidification for 5min continuously, and Hs-Hr is less than c, the double-evaporator system exits the dehumidification mode, the compressor is closed, and the first electromagnetic valve, the second electromagnetic valve, the first expansion valve and the second expansion valve are all closed;
the PI regulation formula of the compressor is as follows: u (k) ═ Kp [ e (k) -e (k-1) ] + e (k) × 1/Ti;
kp in the PI regulation formula of the compressor is a proportional coefficient, and Ti is integral time;
the compressor speed is equal to the current speed + u (k);
when the dual evaporator system enters dehumidification mode: humidity deviation e (k) ═ Hr-Hs;
the opening degree regulating PI formula of the first expansion valve and the second electronic expansion valve is as follows:
u(k)＝Kp*[e(k)-e(k-1)]+e(k)*1/Ti；
kp in the first expansion valve and the opening adjusting PI formula of the second electronic expansion valve is a proportional coefficient, and Ti is integration time;
the intake air superheat deviation e (k) is the current actual intake air superheat — the target intake air superheat.
According to the temperature and humidity adjusting method for the double-evaporator system for realizing constant temperature and constant humidity, provided by the embodiment of the invention, when the control target is return air temperature and humidity, Hr: return air humidity, Hs: setting the humidity of return air;
the temperature and humidity adjusting method comprises the following steps:
when Hs-Hr > c, the double-evaporator system enters a humidifying mode, the water inlet electromagnetic valve is opened every other humidifying water injection period, the humidifying water injection time is t, the humidifier is enabled to operate, and when the humidifying mode of the double-evaporator system is continuously operated for 5min and Hr-Hs < c, the double-evaporator system exits the humidifying mode.
According to the technical scheme, the embodiment of the invention has the following advantages:
in this embodiment, when the low-load refrigeration or dehumidification working condition, in order to not let the compressor frequently start and stop or draw the temperature very low when dehumidifying under low heat load, can directly get into first evaporator through first solenoid valve with the refrigerant that the condenser came out and dispel the heat in, the liquid refrigerant that comes out from first evaporator gets into the evaporation heat absorption in the second evaporator after the second expansion valve throttle into microthermal two-phase refrigerant again, because the high-temperature refrigerant in the first evaporator can dispel the heat to the air after passing through the second evaporator, offset a part refrigeration capacity in the second evaporator, make the refrigeration capacity lower limit of unit reduce, the refrigeration capacity range of whole system has been widened, finally make the temperature of data center keep stable through adjusting the frequency of compressor. In the process, because the heat exchange quantity of the system is offset, energy consumption through electric heating is not needed additionally, and system faults caused by frequent starting and stopping of the compressor can be avoided.
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 description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a dual-evaporator system for achieving constant temperature and humidity according to an embodiment of the present invention;
illustration of the drawings: a compressor 1; a condenser 2; a first electromagnetic valve 3; a first evaporator 4; a second evaporator 5; a second electromagnetic valve 6; a first expansion valve 7; a second expansion valve 8; a humidifier 9; a water inlet electromagnetic valve 10; an intake air temperature sensor 11; an intake pressure sensor 12; an outdoor fan 13; an indoor fan 14.
Detailed Description
The embodiment of the invention discloses a double-evaporator system for realizing constant temperature and constant humidity and a temperature and humidity adjusting method thereof, which are used for solving the problems that the temperature of a data center is unstable and the temperature is easy to deviate from a control target temperature when a machine room air conditioner of the existing data center is in a low-load refrigeration and dehumidification working condition.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, a dual evaporator system for realizing constant temperature and humidity provided in an embodiment of the present invention includes:
a compressor 1, a condenser 2, a first evaporator 4, a second evaporator 5, a first solenoid valve 3, a second solenoid valve 6, a first expansion valve 7, a second expansion valve 8, and a pipe through which a refrigerant flows;
the compressor 1 is sequentially connected with the condenser 2, the first electromagnetic valve 3, the first evaporator 4, the second electromagnetic valve 6 and the second evaporator 5 through pipelines, and one end, far away from the second electromagnetic valve 6, of the second evaporator 5 is connected with the compressor 1;
the first expansion valve 7 is connected between the condenser 2 and the first evaporator 4 through a pipeline, and the first expansion valve 7 is connected with the first electromagnetic valve 3 in parallel;
a second expansion valve 8 is connected between the first evaporator 4 and the second evaporator 5 through a pipeline, and the second expansion valve 8 is connected in parallel with the second electromagnetic valve 6;
one side of the second evaporator 5, which is far away from the first evaporator 4, is provided with a humidifier 9, and the humidifier 9 is connected with a water inlet electromagnetic valve 10.
It should be noted that, with reference to the indoor air circulation direction, the humidifier 9 is located upstream of the air, the second evaporator 5 is located downstream of the humidifier 9, and the first evaporator 4 is located downstream of the second evaporator 5;
when the double-evaporation system is used for normal refrigeration, the refrigerant circulation direction is as follows: compressor 1 → condenser 2 → first expansion valve 7 → first evaporator 4 → second solenoid valve 6 → second evaporator 5 → compressor 1;
when low-load refrigeration or dehumidification is carried out, the circulation direction of the refrigerant is as follows: compressor 1 → condenser 2 → first solenoid valve 3 → first evaporator 4 → second expansion valve 8 → second evaporator 5 → compressor 1
When a large refrigeration demand exists, the refrigerant from the condenser 2 is directly throttled into a low-temperature two-phase refrigerant through the first expansion valve 7, and is evaporated and absorbed in the first evaporator 4 and the second evaporator 5 to take away indoor heat, so that rapid refrigeration and cooling are realized;
when the low-load refrigeration or dehumidification working condition is adopted, in order to prevent the compressor 1 from frequently starting and stopping under low heat load or drawing the temperature to be very low during dehumidification, the refrigerant coming out of the condenser 2 can directly enter the first evaporator 4 through the first electromagnetic valve 3 for heat dissipation, the liquid refrigerant coming out of the first evaporator 4 enters the second expansion valve 8 again and is throttled into low-temperature two-phase refrigerant to be evaporated and absorbed in the second evaporator 5, and the high-temperature refrigerant in the first evaporator 4 can dissipate heat to air passing through the second evaporator 5 to offset part of refrigeration capacity in the second evaporator 5, so that the lower limit of the refrigeration capacity of the unit is reduced, the refrigeration capacity range of the whole system is widened, and finally the temperature of the data center is kept stable by adjusting the frequency of the compressor 1. In the process, because the heat exchange quantity of the system is offset, energy consumption through electric heating is not needed additionally, and system faults caused by frequent starting and stopping of the compressor 1 can be avoided.
When the humidity in the data center is lower, the water inlet electromagnetic valve 10 is opened, the air is humidified by the humidifier 9, and the humidified air sequentially passes through the second evaporator 5 and the first evaporator 4 for heat exchange.
Further, the first expansion valve 7 and the second expansion valve 8 in the present embodiment may employ electronic expansion valves.
Further, an outdoor fan 13 is disposed at the condenser 2.
It should be noted that the outdoor fan 13 is used for discharging heat dissipated from the condenser 2 to the outside.
Further, an indoor fan 14 is disposed at the first evaporator 4.
It should be noted that the indoor fan 14 is used for sending the cooled air into the room.
Further, a suction temperature sensor 11 is disposed on a pipeline connecting the second evaporator 5 and the compressor 1.
The suction temperature sensor 11 is used to sense the temperature of the suction line of the compressor 1.
Further, a suction pressure sensor 12 is further disposed on a pipeline connecting the second evaporator 5 and the compressor 1.
It should be noted that the suction pressure sensor 12 is used for sensing the pressure of the refrigerant in the suction line of the compressor 1.
Further, the humidifier 9 is an electrode humidifier 9, an electric heating humidifier 9, a dry steam humidifier 9, a wet film humidifier 9 or a high-pressure micro-mist humidifier 9.
It should be noted that, the specific type of the humidifier 9 is not limited in this embodiment, and a designer may select an appropriate humidifier 9 according to design requirements.
Example two
The embodiment provides a temperature and humidity adjusting method for realizing a constant temperature and humidity dual-evaporator system, and when a control target is return air temperature and humidity, Tr is set: return air temperature, Ts: return air set temperature, Hr: return air humidity, Hs: setting the humidity of return air;
the temperature and humidity adjusting method in this example specifically includes the following processes:
a refrigeration mode: when Tr-Ts > a (a is 1-2), the double-evaporator system enters a refrigeration mode, a compressor 1 is started, a first electromagnetic valve 3 and a second electromagnetic valve 8 are closed, a first expansion valve 7 and a second electromagnetic valve 6 are opened, PI regulation is carried out on the first expansion valve 7 according to suction superheat degree deviation, and the double-evaporator system operates normally for refrigeration;
after the compressor 1 is started, PI regulation is carried out on the compressor 1 according to temperature difference, when the compressor 1 runs to the minimum preset running frequency of the compressor 1 and Tr (n)/Tr (n-1) × 100% < B (B is 50% -100%) within 3min continuously, the first electromagnetic valve 3 is opened, the second expansion valve 8 is opened, the delay time is 5s, the first expansion valve 7 is closed, the second electromagnetic valve 6 is closed, the second expansion valve 8 carries out PI regulation according to suction superheat degree deviation, and the dual-evaporator system runs low-load refrigeration;
when the dual-evaporator system operates for low-load refrigeration for 5min continuously, and Ts-Tr > a (a is 1-2), the dual-evaporator system exits the refrigeration mode, the compressor 1 is closed, and the first electromagnetic valve 3, the second electromagnetic valve 6, the first expansion valve 7 and the second expansion valve 8 are all closed.
The low-load refrigeration can not meet the temperature control target continuously, the refrigeration mode can be closed, the compressor 1 is prevented from being started and stopped frequently, and a buffering process is provided for shutdown.
In this embodiment, the PI regulation formula of the compressor 1 is:
u(k)＝Kp*[e(k)-e(k-1)]+e(k)*1/Ti；
kp in a PI regulation formula of the compressor 1 is a proportional coefficient, and Ti is integral time;
the rotation speed of the compressor 1 is equal to the current rotation speed + u (k);
when the double-evaporator system enters a refrigeration mode, the temperature difference e (k) is equal to Tr-Ts;
the opening degree regulating PI formulas of the first expansion valve 7 and the second electronic expansion valve 8 are as follows:
u(k)＝Kp*[e(k)-e(k-1)]+e(k)*1/Ti；
kp in opening degree adjusting PI formulas of the first expansion valve 7 and the second electronic expansion valve 8 is a proportional coefficient, and Ti is integration time;
the intake air superheat deviation e (k) is the current actual intake air superheat — the target intake air superheat.
EXAMPLE III
The embodiment provides a temperature and humidity adjusting method for realizing a constant temperature and humidity dual-evaporator system, and when a control target is return air temperature and humidity, Tr is set: return air temperature, Ts: return air set temperature, Hr: return air humidity, Hs: setting the humidity of return air;
the temperature and humidity adjusting method in this example specifically includes the following processes:
a dehumidification mode: when Hr-Hs > c (c is 5% -10%), the double-evaporator system enters a dehumidification mode, the compressor 1 is started, the first electromagnetic valve 3 and the second expansion valve 8 are closed, the first expansion valve 7 and the second electromagnetic valve 6 are opened, and the first expansion valve 7 performs PI regulation according to suction superheat degree deviation;
after the compressor 1 is started, PI regulation is carried out on the compressor 1 according to humidity deviation, when Ts-Tr > B (B is 0-2) and Tr (n)/Tr (n-1) 100% < B (B is 50-100%), the first electromagnetic valve 3 is opened, the second expansion valve 8 is opened, the time delay is 5s, the first expansion valve 7 is closed, the second electromagnetic valve 6 is closed, the second expansion valve 8 carries out PI regulation according to suction superheat degree deviation, and the dual-evaporator system runs low-load dehumidification;
in the process, the compressor 1 is controlled according to the humidity deviation, but the temperature value is detected at the same time, so that the constant-temperature and constant-humidity control under the low-load dehumidification mode is realized, and two sets of independent control logics of humidity and temperature in the prior art are not adopted;
when the double-evaporator system operates for low-load dehumidification for 5min continuously, and Hs-Hr < c (c is 5% -10%), the double-evaporator system exits the dehumidification mode, the compressor 1 is closed, and the first electromagnetic valve 3, the second electromagnetic valve 6, the first expansion valve 7 and the second expansion valve 8 are all closed.
In this embodiment, the PI regulation formula of the compressor 1 is as follows:
u(k)＝Kp*[e(k)-e(k-1)]+e(k)*1/Ti；
kp in the PI regulation formula of the compressor 1 is a proportional coefficient, and Ti is integral time;
the rotation speed of the compressor 1 is equal to the current rotation speed + u (k);
when the dual evaporator system enters dehumidification mode: humidity deviation e (k) ═ Hr-Hs;
the opening degree regulating PI formula of the first expansion valve 7 and the second electronic expansion valve 8 is as follows:
u(k)＝Kp*[e(k)-e(k-1)]+e(k)*1/Ti；
kp in opening degree adjusting PI formulas of the first expansion valve 7 and the second electronic expansion valve 8 is a proportional coefficient, and Ti is integration time;
the intake air superheat deviation e (k) is the current actual intake air superheat — the target intake air superheat.
Example four
The embodiment provides a temperature and humidity adjusting method for realizing a constant temperature and humidity dual-evaporator system, and when a control target is return air temperature and humidity, Hr is set: return air humidity, Hs: setting the humidity of return air;
the temperature and humidity adjusting method in this example specifically includes the following processes:
a humidifying mode: when Hs-Hr > c (c is 5% -10%), the double-evaporator system enters a humidification mode, the water inlet electromagnetic valve 10 is opened every humidification water injection period, the humidification water injection time is t, the humidifier 9 is enabled to operate, and when the double-evaporator system operates in the humidification mode for 5min continuously, and Hr-Hs < c (c is 5% -10%), the double-evaporator system exits the humidification mode.
Further, by adopting the temperature and humidity adjusting methods of the second embodiment, the third embodiment and the fourth embodiment, the dual-evaporator system can achieve the following effects:
1. the refrigerating capacity range of the system is widened, and the fluctuation of the internal temperature of the data center caused by frequent start and stop of the system is avoided;
2. the method avoids that the internal temperature of the data center is uncontrolled and deviates from the set temperature of the data center during dehumidification;
3. the electric heating is avoided to dissipate heat when the compressor 1 is started under low load, and the power consumption of the system during operation is reduced.
The double-evaporator system for realizing constant temperature and constant humidity and the temperature and humidity adjusting method thereof are used for solving the problems that the temperature of a data center is unstable and the temperature is easy to deviate from a control target temperature when an existing machine room air conditioner of the data center is in a low-load refrigeration and dehumidification working condition. Having described the detailed description, those skilled in the art will recognize that changes may be made in the specific embodiments and applications of the inventive concepts described herein, and accordingly, such descriptions are not intended to be limiting.
Claims (10)
1. A dual evaporator system for achieving constant temperature and humidity, comprising: the system comprises a compressor, a condenser, a first evaporator, a second evaporator, a first electromagnetic valve, a second electromagnetic valve, a first expansion valve, a second expansion valve and a pipeline for flowing of refrigerant;
the compressor is sequentially connected with the condenser, the first electromagnetic valve, the first evaporator, the second electromagnetic valve and the second evaporator through pipelines, and one end, far away from the second electromagnetic valve, of the second evaporator is connected with the compressor;
the condenser and the first evaporator are connected with the first expansion valve through a pipeline, and the first expansion valve is connected with the first electromagnetic valve in parallel;
a second expansion valve is connected between the first evaporator and the second evaporator through a pipeline, and the second expansion valve is connected with the second electromagnetic valve in parallel;
and a humidifier is arranged on one side of the second evaporator, which is far away from the first evaporator, and is connected with a water inlet electromagnetic valve.
2. The dual evaporator system for constant temperature and humidity according to claim 1, wherein the first expansion valve and the second expansion valve are electronic expansion valves.
3. The dual evaporator system for realizing constant temperature and humidity according to claim 1, wherein an outdoor fan is disposed at the condenser.
4. The dual evaporator system for realizing constant temperature and humidity according to claim 1, wherein an indoor fan is disposed at the first evaporator.
5. The dual evaporator system for realizing constant temperature and humidity according to claim 1, wherein a suction temperature sensor is arranged on a pipeline connecting the second evaporator and the compressor.
6. The dual-evaporator system for realizing constant temperature and constant humidity according to claim 5, wherein a suction pressure sensor is further arranged on a pipeline connecting the second evaporator and the compressor.
7. The dual evaporator system for realizing constant temperature and constant humidity according to claim 1, wherein the humidifier is an electrode humidifier, an electric heating humidifier, a dry steam humidifier, a wet film humidifier or a high-pressure micro-mist humidifier.
8. The temperature and humidity adjusting method for the double-evaporator system for realizing constant temperature and constant humidity is characterized in that when the control target is return air temperature and humidity, Tr is set: return air temperature, Ts: return air set temperature, Hr: return air humidity, Hs: setting the humidity of return air;
the temperature and humidity adjusting method comprises the following steps:
when Tr-Ts is larger than a, the double-evaporator system enters a refrigeration mode, the compressor is started, the first electromagnetic valve and the second electromagnetic valve are closed, the first expansion valve and the second electromagnetic valve are opened, the first expansion valve performs PI regulation according to suction superheat degree deviation, and the double-evaporator system operates normally for refrigeration;
after the compressor is started, PI regulation is carried out on the compressor according to temperature difference, when the compressor runs to the minimum preset running frequency of the compressor and Tr (n)/Tr (n-1) × 100% < B within 3min continuously, the first electromagnetic valve is opened, the second expansion valve is opened, the delay time is 5s, the first expansion valve is closed, the second electromagnetic valve is closed, the second expansion valve carries out PI regulation according to suction superheat degree deviation, and the double-evaporator system runs low-load refrigeration;
when the double-evaporator system operates low-load refrigeration for 5min continuously and Ts-Tr is greater than a, the double-evaporator system exits the refrigeration mode, the compressor is closed, and the first electromagnetic valve, the second electromagnetic valve, the first expansion valve and the second expansion valve are all closed;
the PI regulation formula of the compressor is as follows: u (k) ═ Kp [ e (k) -e (k-1) ] + e (k) × 1/Ti;
kp in the PI regulation formula of the compressor is a proportional coefficient, and Ti is integral time;
the compressor speed is equal to the current speed + u (k);
when the double-evaporator system enters a refrigeration mode, the temperature difference e (k) is equal to Tr-Ts;
the opening degree regulating PI formula of the first expansion valve and the second electronic expansion valve is as follows:
u(k)＝Kp*[e(k)-e(k-1)]+e(k)*1/Ti；
kp in the first expansion valve and the opening adjusting PI formula of the second electronic expansion valve is a proportional coefficient, and Ti is integration time;
the intake air superheat deviation e (k) is the current actual intake air superheat — the target intake air superheat.
9. The temperature and humidity adjusting method for the double-evaporator system for realizing constant temperature and constant humidity is characterized in that when the control target is return air temperature and humidity, Tr is set: return air temperature, Ts: return air set temperature, Hr: return air humidity, Hs: setting the humidity of return air;
the temperature and humidity adjusting method comprises the following steps:
when Hr-Hs > c, the double-evaporator system enters a dehumidification mode, the compressor is started, the first electromagnetic valve and the second expansion valve are closed, the first expansion valve and the second electromagnetic valve are opened, and the first expansion valve performs PI regulation according to the suction superheat degree deviation;
after the compressor is started, PI regulation is carried out on the compressor according to humidity deviation, when Ts-Tr > B and Tr (n)/Tr (n-1) × 100% < B, a first electromagnetic valve is opened, a second expansion valve is opened, time delay is 5s, the first expansion valve is closed, the second electromagnetic valve is closed, PI regulation is carried out on the second expansion valve according to suction superheat degree deviation, and the double-evaporator system operates low-load dehumidification;
when the double-evaporator system operates for low-load dehumidification for 5min continuously, and Hs-Hr is less than c, the double-evaporator system exits the dehumidification mode, the compressor is closed, and the first electromagnetic valve, the second electromagnetic valve, the first expansion valve and the second expansion valve are all closed;
the PI regulation formula of the compressor is as follows: u (k) ═ Kp [ e (k) -e (k-1) ] + e (k) × 1/Ti;
kp in the PI regulation formula of the compressor is a proportional coefficient, and Ti is integral time;
the compressor speed is equal to the current speed + u (k);
when the dual evaporator system enters dehumidification mode: humidity deviation e (k) ═ Hr-Hs;
the opening degree regulating PI formula of the first expansion valve and the second electronic expansion valve is as follows:
u(k)＝Kp*[e(k)-e(k-1)]+e(k)*1/Ti；
kp in the first expansion valve and the opening adjusting PI formula of the second electronic expansion valve is a proportional coefficient, and Ti is integration time;
the intake air superheat deviation e (k) is the current actual intake air superheat — the target intake air superheat.
10. The temperature and humidity adjusting method for the double-evaporator system for realizing constant temperature and constant humidity is characterized in that when the control target is return air temperature and humidity, Hr is set as follows: return air humidity, Hs: setting the humidity of return air;
the temperature and humidity adjusting method comprises the following steps:
when Hs-Hr > c, the double-evaporator system enters a humidifying mode, the water inlet electromagnetic valve is opened every other humidifying water injection period, the humidifying water injection time is t, the humidifier is enabled to operate, and when the humidifying mode of the double-evaporator system is continuously operated for 5min and Hr-Hs < c, the double-evaporator system exits the humidifying mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210049245.8A CN114353390A (en) | 2022-01-17 | 2022-01-17 | Double-evaporator system for realizing constant temperature and constant humidity and temperature and humidity adjusting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210049245.8A CN114353390A (en) | 2022-01-17 | 2022-01-17 | Double-evaporator system for realizing constant temperature and constant humidity and temperature and humidity adjusting method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114353390A true CN114353390A (en) | 2022-04-15 |
Family
ID=81091934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210049245.8A Pending CN114353390A (en) | 2022-01-17 | 2022-01-17 | Double-evaporator system for realizing constant temperature and constant humidity and temperature and humidity adjusting method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114353390A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101206278B1 (en) * | 2012-07-30 | 2012-11-29 | 주)에어솔루션스 | Apparatus for Constant Temperature and Humidity System Using Heat Pump And Control Method Thereof |
| CN206113181U (en) * | 2016-09-21 | 2017-04-19 | 上海湿腾电器有限公司 | Constant temperature and humidity machine |
| CN107044699A (en) * | 2016-12-30 | 2017-08-15 | 广东申菱环境系统股份有限公司 | A kind of intelligent water cold mould thermostatic and humidistatic air conditioning unit and its temperature and humidity regulation method |
-
2022
- 2022-01-17 CN CN202210049245.8A patent/CN114353390A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101206278B1 (en) * | 2012-07-30 | 2012-11-29 | 주)에어솔루션스 | Apparatus for Constant Temperature and Humidity System Using Heat Pump And Control Method Thereof |
| CN206113181U (en) * | 2016-09-21 | 2017-04-19 | 上海湿腾电器有限公司 | Constant temperature and humidity machine |
| CN107044699A (en) * | 2016-12-30 | 2017-08-15 | 广东申菱环境系统股份有限公司 | A kind of intelligent water cold mould thermostatic and humidistatic air conditioning unit and its temperature and humidity regulation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102425841B (en) | Method for controlling machine room air conditioner based on variable frequency compressor | |
| CN107894047B (en) | Machine room air conditioner refrigerating system and humidity control method thereof | |
| CN201811509U (en) | Refrigerating plant with adjustable evaporation pressure and flow | |
| CN113854612B (en) | Drying unit control method, readable storage medium and drying unit | |
| CN107062468B (en) | Double-cold-source machine room air conditioning system and control method thereof | |
| CN112066521A (en) | Control system and method for low-load dehumidification precise air conditioner | |
| CN107906640A (en) | A kind of integrated chilling air conditioning system and its control method for data center | |
| JP2013073502A (en) | Environment testing device | |
| CN111351151B (en) | Variable air volume fresh air dehumidification system for underground engineering and control method thereof | |
| CN108105965B (en) | Air conditioning system for controlling air outlet humidity and control method thereof | |
| CN112556227A (en) | Air conditioning unit, frequency converter cooling system and control method thereof | |
| US20060042279A1 (en) | Cooling plant for a fluid with control of variables | |
| CN112400088A (en) | Refrigeration device and associated operating method | |
| CN207797334U (en) | A kind of air-conditioning system of control air-out humidity | |
| CN207471687U (en) | Air-conditioning system and the air conditioner with the air-conditioning system | |
| CN111023414B (en) | Air conditioning system and dehumidification control method | |
| CN112268379A (en) | Heat pump system, control method and device thereof, air conditioning equipment and storage medium | |
| CN114353390A (en) | Double-evaporator system for realizing constant temperature and constant humidity and temperature and humidity adjusting method thereof | |
| CN213514499U (en) | Heat pump system and air conditioning equipment | |
| CN108548236A (en) | A kind of integrated energy-saving type air conditioner | |
| CN116182338A (en) | Machine room air conditioner, operation control method and operation control device thereof | |
| CN112393492A (en) | Humidity control method for refrigerating chamber and refrigerator | |
| CN216347143U (en) | Machine room air conditioner and control device thereof | |
| JPH0415478A (en) | Thawing and cold-keeping apparatus using heat pump | |
| CN212278706U (en) | Constant temperature dehumidification refrigerating plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |