CN1325851C - Industrial factory building safety energy-saving mixed ventilating control system - Google Patents
Industrial factory building safety energy-saving mixed ventilating control system Download PDFInfo
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- CN1325851C CN1325851C CNB2005101104403A CN200510110440A CN1325851C CN 1325851 C CN1325851 C CN 1325851C CN B2005101104403 A CNB2005101104403 A CN B2005101104403A CN 200510110440 A CN200510110440 A CN 200510110440A CN 1325851 C CN1325851 C CN 1325851C
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Abstract
The present invention relates to an industrial factory building safety energy-saving mixed ventilating control system, which belongs to the field of the ventilating engineering and the control technology. The present invention comprises a control device, a mechanical ventilator, a frequency changer, three temperature sensors and a voltage and current sensor. A computational formula of real-time mechanical ventilation quantity required by an industrial factory building is determined through the total input electrical power for monitoring natural air exhausting temperature, outdoor temperature and industrial factory building according to a principle of conservation of energy, a natural ventilation quantity computation principle and industrial factory building indoor safety set temperature, the computational formula is cured in a control device, and an input electric frequency of a blower is controlled reasonably according to frequency-air quantity characteristics of a blower frequency converter to realize the energy-saving control of an industrial factory building mixed ventilating system. The present invention has convenient installation maintenance, the present invention not only can guarantee the industrial factory building safe operation, but also has obvious energy-saving effect, and the present invention has good economical and social benefits.
Description
Technical field
What the present invention relates to is a kind of ventilated control system of industrial premises, and particularly a kind of industrial factory building safety energy-saving mixed ventilating control system that is used to have a large amount of indoor waste heats belongs to ventilating engineering and control technology field.
Background technology
Many industrial premises such as transformer room etc., be furnished with a lot of heat-producing devices, these equipment can produce a large amount of waste heats in the middle of operation, too high for preventing the industrial premises indoor temperature, to guarantee the safe operation of equipment, often need to utilize to ventilate industrial premises is carried out heat extraction.Gravity-flow ventilation is a kind ofly to ventilate without any need for energy cost " economical ", and in prior art, application number is 93222172, and grant number is 19940713, and name is called the utility model patent of the very useful natural ventilator of dcm layer; Application number is 97228990, and grant number is 19990317, and name is called the utility model patent of streamlined combined type ventilating skylight; Application number is 01239076, and grant number is 20020410, and name is called the utility model patent of roofing type natural ventilator, is for the gravity-flow ventilation design of industrial premises basically.Owing to be subjected to extraneous interference factors, natural ventilation rate often fluctuates very big, single natural ventilation system can not satisfy the heat extraction requirement of industrial premises constantly, just must consider that at this moment the force ventilation mode strengthens the heat extraction of industrial premises, so-called mixed ventilation mode that Here it is.At present, many industrial premises have generally adopted the mixed ventilation system, promptly utilize gravity-flow ventilation and force ventilation to eliminate the interior waste heat of industrial premises simultaneously.But when designing in the mixed ventilation system, for the sake of security, the minimum airflow value that the nature air quantity is got " least favorable " usually, the force ventilation amount then designs very greatly, it is a lot of often will to surpass the actual demand value, and in the middle of actual motion, all constant operations under design air flow of mechanical ventilator, so just do not give full play to the effect of gravity-flow ventilation, caused a large amount of wastes because of the excessive energy that causes of force ventilation amount.
Summary of the invention
In order to overcome the shortcomings and deficiencies of prior art, satisfy the development need of China's industrial premises ventilating system energy-saving design, the present invention designs a kind of industrial factory building safety energy-saving mixed ventilating control system, by monitoring natural exhaust temperature, total input electric power of outdoor temperature and each equipment of industrial premises, according to conservation of energy principle, natural ventilation rate calculates principle and industrial premises indoor security design temperature is determined the real-time force ventilation amount that industrial premises needs indirectly, by frequency converter blower fan is carried out variable frequency adjustment then, make the industrial premises ventilating system satisfy under the situation of production safety realize farthest energy-conservation.
The present invention is achieved by the following technical solutions, the present invention includes control device, mechanical ventilator, frequency converter, the A temperature sensor, the B temperature sensor, C temperature sensor, voltage sensor, current sensor, wherein, control device comprises three temperature sensor interfaces, a voltage sensor interface, a current sensor interface, the multi way temperature change-over circuit, multi way temperature voltage signal amplifying circuit, plurality of voltages shaping circuit, multi-channel A/D change-over circuit, cpu data process chip, pin-saving chip, RS-485 communication data conversion chip and RS-485 communication interface.
Deployment scenarios according to equipment in the factory building, many mechanical ventilator are installed in the industrial premises roof with gravity-flow ventilation structure, and all be connected with frequency converter, the A temperature sensor is positioned at nature air-out roof, the B temperature sensor is positioned at outside the industrial premises, the C temperature sensor is positioned at industrial premises, and voltage sensor and current sensor are installed on total input circuit of industrial premises.The A temperature sensor, the B temperature sensor, the C temperature sensor, the signal output part of voltage sensor and current sensor is connected with the signal input part of control device by the corresponding interface respectively, the input of fan frequency converter control signal is connected with the signal output part of control device by the RS-485 communication interface, in control device inside, three temperature sensor interfaces are connected with the input of multi way temperature change-over circuit respectively, the output of multi way temperature change-over circuit is connected with the input of multi way temperature voltage signal amplifying circuit respectively, the voltage sensor interface is connected with the input of plurality of voltages shaping circuit respectively with the current sensor interface, the output of multi way temperature voltage signal amplifying circuit and plurality of voltages shaping circuit is connected with the input of multi-channel A/D change-over circuit respectively, the output of multi-channel A/D change-over circuit is connected with the input of cpu data process chip, pin-saving chip, RS-485 communication data conversion chip is connected with the cpu data process chip respectively, and the RS-485 communication interface is connected with the output of RS-485 communication data conversion chip.
Under any circumstance, the calculating formula of the required force ventilation amount of industrial premises is derived as follows:
According to conservation of energy principle, (1) formula is set up:
Q
n＝G
npc
a(t
p-t
w)+G
jpc
a(t
n-t
w) (1)
In the formula (1),
Q
n---total waste heat of industrial premises promptly needs to utilize the heat that ventilates and drain, kW;
c
a---the specific heat capacity of air, kJ/ (kg ℃);
G
Jp---industrial premises force ventilation amount, kg/s;
G
Np---industrial premises natural exhaust amount, kg/s;
t
p---industrial premises natural exhaust temperature, obtain by the A temperature sensor monitors, ℃;
t
w---outside air temperature, obtain by the B temperature sensor monitors, ℃;
t
n---the industrial premises indoor air temperature, obtain by the C temperature sensor monitors, ℃;
(1) first heat that expression is drained by gravity-flow ventilation in formula equal sign the right, second heat that expression is drained by force ventilation in (1) formula equal sign the right.
Q
nCalculate by (2) formula:
Q
n＝k
x·U
z·I
z (2)
In the formula (2),
I
z---total input current of each equipment of industrial premises obtains A by the current sensor monitoring;
U
z---the input voltage of each equipment of industrial premises obtains V by the voltage sensor monitoring;
k
x---with each equipment effective heat dissipation coefficient coefficient relevant in the industrial premises with the equipment dense degree;
Industrial premises natural ventilation rate G
NpThe experience calculating formula be:
G
np＝K
npH
b(t
n-t
w) (3)
In the formula (3),
k
Np---the natural exhaust coefficient obtains according to the field measurement data fitting;
H
b---the vertical height between industrial premises air inlet and air outlet, m.
With (2), (3) formula substitution (1) formula, can get the required force ventilation amount of industrial premises and be:
Suppose that it is t that industrial premises allows the highest indoor air temperature
N, max, then force ventilation amount can be determined by following formula:
In the formula (5), G
dBe the force ventilation amount that industrial premises designs, kg/s.
Formula (5) is solidificated in the middle of the pin-saving chip of control device coefficient k wherein
xWith the natural exhaust coefficient k
NpCan determine according to actual conditions.
Like this, monitor the industrial premises nature leaving air temp t that obtains respectively according to A temperature sensor, B temperature sensor, C temperature sensor
p, outside air temperature t
wWith industrial premises indoor air temperature t
n, and monitor the industrial premises that obtains by voltage sensor and current sensor and import total current I
zWith input voltage U
z, can utilize the cpu data process chip of control device to calculate the required real-time force ventilation amount G of industrial premises according to formula (5)
Jp, utilize control device to determine the electric frequency of suitable input of each ventilation blower of industrial premises then according to the air quantity-frequency characteristic of fan frequency converter, finally realize the energy-saving run of industrial premises mixed ventilation system.
Beneficial effect of the present invention:
Industrial factory building safety energy-saving mixed ventilating control system of the present invention, convenient for installation and maintenance, practical, can predict the natural ventilation rate of industrial premises according to practical operation situation, and reasonably definite required force ventilation amount of industrial premises, not only can guarantee the industrial factory building safety operation, and energy-saving effect is very obvious, has good economic benefits and social benefit.
Description of drawings
Fig. 1 is an industrial factory building safety energy-saving mixed ventilating control system schematic diagram of the present invention.
Fig. 2 is the control device structured flowchart of industrial factory building safety energy-saving mixed ventilating control system of the present invention.
Fig. 3 is the workflow diagram of industrial factory building safety energy-saving mixed ventilating control system of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing concrete enforcement of the present invention is further described.
As Fig. 1, shown in Figure 2, the present invention includes control device 3, mechanical ventilator 4, frequency converter 5, A temperature sensor 6, B temperature sensor 7, C temperature sensor 8, voltage sensor 9, current sensor 10, wherein, control device 3 comprises temperature sensor A interface 11, temperature sensor B interface 12, temperature sensor C interface 13, voltage sensor interface 14, current sensor interface 15, multi way temperature change-over circuit 16, multi way temperature voltage signal amplifying circuit 17, plurality of voltages shaping circuit 18, multi-channel A/D change-over circuit 19, cpu data process chip 20, pin-saving chip 21, RS-485 communication data conversion chip 22, RS-485 communication interface 23.A temperature sensor 6, B temperature sensor 7 and C temperature sensor 8 all adopt the AD590 device; Voltage sensor 9 adopts CHV-series closed loop Hall voltage sensor; Current sensor 10 adopts CHB-KA series Hall great current sensor; Multi-channel A/D change-over circuit 19 adopts ADC0809; Cpu data process chip 20 adopts the 89C52 cpu chip; Pin-saving chip 21 adopts the 93C46 chip.
As shown in Figure 1, industrial premises 1 has the gravity-flow ventilation structure, mechanical ventilator 4 is installed in industrial premises 1 roof according to the deployment scenarios of equipment in the factory building, and be connected with frequency converter 5, A temperature sensor 6 is positioned at nature air-out roof 2, be used to monitor the nature leaving air temp, B temperature sensor 7 is positioned at outside the industrial premises, be used to monitor outside air temperature, for avoiding the influence of solar radiation, the B temperature sensor 7 outer radiation protective casings that are provided with, C temperature sensor 8 is positioned at industrial premises, be used to monitor the industrial premises indoor air temperature, voltage sensor 9 and current sensor 10 are installed in respectively on total input circuit of industrial premises, be used to monitor the total electric input power of industrial premises, A temperature sensor 6, B temperature sensor 7, C temperature sensor 8, the signal output part of voltage sensor 9 and current sensor 10 respectively with temperature sensor A interface 11, temperature sensor B interface 12, temperature sensor C interface 13, voltage sensor interface 14 is connected with current sensor interface 15, the control signal input of frequency converter 5 is connected with RS-485 communication interface 23 by the RS-485 communication bus
As shown in Figure 2, temperature sensor A interface 11, temperature sensor B interface 12 is connected with the input of multi way temperature change-over circuit 16 respectively with temperature sensor C interface 13, the output of multi way temperature change-over circuit 16 is connected with the input of multi way temperature voltage signal amplifying circuit 17 respectively, voltage sensor interface 14 is connected with the input of plurality of voltages shaping circuit 18 respectively with current sensor interface 15, the output of multi way temperature voltage signal amplifying circuit 17 and plurality of voltages shaping circuit 18 is connected with the input of multi-channel A/D change-over circuit 19 respectively, the output of multi-channel A/D change-over circuit 19 is connected with the input of cpu data process chip 20, pin-saving chip 21, RS-485 communication data conversion chip 22 is connected with cpu data process chip 20 respectively, and RS-485 communication interface 23 is connected with the output of RS-485 communication data conversion chip 22.
As shown in Figure 3, the temperature signal that is obtained by A temperature sensor 6, B temperature sensor 7 and C temperature sensor 8 is by behind the multi way temperature change-over circuit 16, become amplitude 5V, the standard electric pulse signal of pulsewidth 20MS, after sort signal is handled through temperature voltage signal amplifying circuit 17 respectively, send into after multi-channel A/D change-over circuit 19 carries out analog-to-digital conversion through interface circuit, give cpu data process chip 20 again and handle; Voltage signal that is monitored by voltage sensor 9 and current sensor 10 and current signal become amplitude 5V after by plurality of voltages shaping circuit 18, the standard electric pulse signal of pulsewidth 20MS is undertaken sending into cpu data process chip 20 after the analog-to-digital conversion by A/D change-over circuit 19 and handles.
The calculating formula (5) of the force ventilation amount that industrial premises is needed is solidificated in the pin-saving chip 21, and calculating formula (5) is described below:
In the formula,
c
a---the specific heat capacity of air, kJ/ (kg ℃) gets 1.01;
G
Jp---industrial premises force ventilation amount, kg/s;
G
Np---industrial premises natural exhaust amount, kg/s;
t
p---industrial premises nature leaving air temp, obtain by the A temperature sensor monitors, ℃;
t
w---outside air temperature, obtain by the B temperature sensor monitors, ℃;
t
n---the industrial premises indoor air temperature, obtain by the C temperature sensor monitors, ℃;
t
N, max---industrial premises allows the highest indoor air temperature, ℃;
I
z---total input current of each equipment of industrial premises obtains A by the current sensor monitoring;
U
z---the input voltage of each equipment of industrial premises obtains V by the voltage sensor monitoring;
k
x---with each equipment effective heat dissipation coefficient coefficient relevant in the industrial premises, generally get 0.6-1.0 with the equipment dense degree;
k
Np---the natural exhaust coefficient obtains according to the field measurement data fitting;
Pin-saving chip 21 has erasable function, so that the coefficient k in (5) formula
xWith the natural exhaust coefficient k
NpSetting.
By A temperature sensor 6, B temperature sensor 7, C temperature sensor 8, voltage sensor 9 becomes digital signal corresponding with the physical signalling that current sensor 10 monitors respectively by the circuit conversion in the controller 3, these data signals are sent in the cpu data process chip 20, and calculate the force ventilation amount that industrial premises needs according to formula (5), determine the electric frequency of suitable input of blower fan then by the frequency conversion-air quantity characteristic of fan frequency converter, carry out electric frequency parameter by 23 pairs of fan frequency converters of RS-485 communication interface 5 and set, finally realize the energy-saving run of industrial premises mixed ventilation system.
Claims (4)
1. industrial factory building safety energy-saving mixed ventilating control system, comprise control device (3), mechanical ventilator (4), fan frequency converter (5), A temperature sensor (6), B temperature sensor (7), C temperature sensor (8), voltage sensor (9), current sensor (10), wherein, control device (3) comprises temperature sensor A interface (11), temperature sensor B interface (12), temperature sensor C interface (13), voltage sensor interface (14), current sensor interface (15), multi way temperature change-over circuit (16), multi way temperature voltage signal amplifying circuit (17), plurality of voltages shaping circuit (18), multi-channel A/D change-over circuit (19), cpu data process chip (20), pin-saving chip (21), RS-485 communication data conversion chip (22), RS-485 communication interface (23), it is characterized in that by monitoring natural exhaust temperature, total input electric power of outdoor temperature and industrial premises (1), according to conservation of energy principle, natural ventilation rate calculates principle and industrial premises (1) indoor security design temperature is determined the real-time force ventilation amount that industrial premises (1) needs indirectly, and the input electricity frequency of blower fan is rationally controlled according to the frequency-air quantity characteristic of fan frequency converter (5), to realize the Energy Saving Control of industrial premises mixed ventilation system, industrial premises (1) has the gravity-flow ventilation structure, mechanical ventilator (4) is installed in industrial premises (1) roof, and be connected with frequency converter (5), A temperature sensor (6) is positioned at nature air-out roof (2), B temperature sensor (7) is positioned at outside the industrial premises (1), C temperature sensor (8) is positioned at industrial premises (1), voltage sensor (9) and current sensor (10) are installed in respectively on total input circuit of industrial premises (1), A temperature sensor (6), B temperature sensor (7), C temperature sensor (8), the output of voltage sensor (9) and current sensor (10) respectively with temperature sensor A interface (11), temperature sensor B interface (12), temperature sensor C interface (13), voltage sensor interface (14) is connected with current sensor interface (15), the control signal input of fan frequency converter (5) is connected with RS-485 communication interface (23) by the RS-485 communication bus, the calculating formula of the force ventilation amount that industrial premises (1) needs is solidificated in the pin-saving chip (21) of control device (3), and calculating formula is described below:
In the formula,
c
a---the specific heat capacity of air, kJ/ (kg ℃) gets 1.01;
G
Jp---industrial premises force ventilation amount, kg/s;
G
d---the force ventilation amount of industrial premises design, kg/s;
H
b---the vertical height between industrial premises air inlet and air outlet, m;
t
p---industrial premises nature leaving air temp, obtain by the A temperature sensor monitors, ℃;
t
w---outside air temperature, obtain by the B temperature sensor monitors, ℃;
t
n---the industrial premises indoor air temperature, obtain by the C temperature sensor monitors, ℃;
t
N, max---industrial premises allows the highest indoor air temperature, ℃;
I
z---total input current of each equipment of industrial premises obtains A by the current sensor monitoring;
U
z---the input voltage of each equipment of industrial premises obtains V by the voltage sensor monitoring;
k
x---with each equipment effective heat dissipation coefficient coefficient relevant in the industrial premises, get 0.6-1.0 with the equipment dense degree;
k
Np---the natural exhaust coefficient obtains according to the field measurement data fitting.
2. industrial factory building safety energy-saving mixed ventilating control system according to claim 1, it is characterized in that in the described control device (3), temperature sensor A interface (11), temperature sensor B interface (12) is connected with the input of multi way temperature change-over circuit (16) respectively with temperature sensor C interface (13), the output of multi way temperature change-over circuit (16) is connected with the input of multi way temperature voltage signal amplifying circuit (17) respectively, voltage sensor interface (14) is connected with the input of plurality of voltages shaping circuit (18) respectively with current sensor interface (15), the output of multi way temperature voltage signal amplifying circuit (17) and plurality of voltages shaping circuit (18) is connected with the input of multi-channel A/D change-over circuit (19) respectively, the output of multi-channel A/D change-over circuit (19) is connected with the input of cpu data process chip (20), pin-saving chip (21), RS-485 communication data conversion chip (22) is connected with cpu data process chip (20) respectively, and RS-485 communication interface (23) is connected with the output of RS-485 communication data conversion chip (22).
3. industrial factory building safety energy-saving mixed ventilating control system according to claim 1, it is characterized in that described A temperature sensor (6), B temperature sensor (7) and C temperature sensor (8) all adopt the AD590 device, voltage sensor (9) adopts CHV-series closed loop Hall voltage sensor, current sensor (10) adopts CHB-KA series Hall great current sensor, multi-channel A/D change-over circuit (19) adopts ADC0809, cpu data process chip (20) adopts the 89C52 cpu chip, and pin-saving chip (21) adopts the 93C46 chip.
4. industrial factory building safety energy-saving mixed ventilating control system according to claim 1 is characterized in that being provided with radiation protective casing outside the B temperature sensor (7), and pin-saving chip (21) has erasable function.
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| CNB2005101104403A CN1325851C (en) | 2005-11-17 | 2005-11-17 | Industrial factory building safety energy-saving mixed ventilating control system |
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| CN101126926B (en) * | 2006-08-14 | 2011-01-26 | 陈广 | Environment-friendly energy-saving intelligent control system for building and its control method |
| CN102003377A (en) * | 2010-11-23 | 2011-04-06 | 北京时代科仪新能源科技有限公司 | Control device and method for air compressor |
| CN102736588B (en) * | 2012-05-25 | 2014-10-22 | 北京天地云箱科技有限公司 | Monitoring method and system |
| CN108593123A (en) * | 2017-12-08 | 2018-09-28 | 颍上县安迪米业有限责任公司 | A kind of temperature measuring equipment of glutinous rice station-service energy-saving effect |
| CN109346277B (en) * | 2018-10-31 | 2020-11-06 | 国网上海市电力公司 | Method for automatically controlling temperature of transformer room |
| CN111664104B (en) * | 2020-06-19 | 2021-10-22 | 诸暨市开翎工业设计有限公司 | Intelligent exhaust fan capable of automatically adjusting wind power |
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