CN2745035Y - Cost allocation device for central air-conditioner draught fan coil pipe in office buildings - Google Patents

Cost allocation device for central air-conditioner draught fan coil pipe in office buildings Download PDF

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Publication number
CN2745035Y
CN2745035Y CNU2004200903240U CN200420090324U CN2745035Y CN 2745035 Y CN2745035 Y CN 2745035Y CN U2004200903240 U CNU2004200903240 U CN U2004200903240U CN 200420090324 U CN200420090324 U CN 200420090324U CN 2745035 Y CN2745035 Y CN 2745035Y
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fan coil
cost allocation
allocation device
microprocessor
output
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方燕宝
柳玉光
谢瑞东
张建成
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HANGZHOU HOMEWELL INTELLIGENCE CONTROL CO Ltd
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HANGZHOU HOMEWELL INTELLIGENCE CONTROL CO Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/30—Smart metering, e.g. specially adapted for remote reading

Abstract

The utility model relates to a cost allocation device for a central air-conditioner draught fan coil pipe in office buildings which mainly comprises a fan coil pipe cost allocation device and a region management machine. The fan coil pipe cost allocation device comprises a microprocessor, a communication module, a data collection module, an output control module, a data display man-machine operation module and a power supply module, and the fan coil pipe cost allocation device sends the data to the region management machine through a communication module and an AB line. The P2 opening of the fan coil pipe cost allocation device is a display and output control interface, and the P2 opening can drive a nixie tube through a 74LS07 signal, and the P2 opening can control the output of controlled silicon latched by a 74LS374 signal. The P0 opening of the device is a signal collecting single opening, the output terminal of a temperature sensor and a humidity sensor is connected with a multi-way switch, and the output of the multi-way switch is connected to P0. 1 and P0. 2. The cost allocation device has the advantages that the cost allocation device has complete functions, low investment cost and high capacity-price ratio, the cost allocation device is integrated with a fan controller as an entirety, and the cost allocation device reduces the influence of the deviation of an end measuring device to the cost allocation fairness.

Description

The cost allocation device of office buildings central air conditioner fan coil
Technical field
The utility model relates to a kind of taximeter, mainly is a kind of cost allocation device of office buildings central air conditioner fan coil.
Background technology
For a long time, heating system has become essential means and has guaranteed people's required indoor conditions of living in winter for the northern area of China.Yet the energy consumption of heating system is huge, and the energy consumption problem has also become a very important factor of restriction Chinese national economy development.According to statistics, China's nineteen ninety-five cold district heating energy consumption reaches 1.27 hundred million tons of standard coal equivalents, account for 10.7% of national total energy consumption, account for 21.4% of heating area whole society energy consumption, in addition in some cold district town building energy consumption over half up to the social total energy consumption in locality then.The serious phenomenon of heating energy resource consumption has caused the Ministry of Construction and insider's attention, and various power-saving technologies, energy-conservation means are arisen at the historic moment, and the household measurement heat-supplying technology is exactly to be born under such background and to be able to promotion and application.According to foreign experience, the buildings of using behind the household measurement heat-supplying can save energy 20%-30% winter.At present, in the design specifications in some heating area or local policies and regulations, clearly be defined in the engineering of new building or newly-increased heating system, heat separating user metering measure must have been arranged.This has shown fully that also energy meter technology and means have caused the attention of government.China will guarantee to implement the target finish energy-conservation second step, realizes that promptly national covil construction are energy-conservation 50%, and hot measurement technology is a key wherein.
But for most of area, south, not to utilize heating, but adopt the mode of central air conditioning to provide needed comfortable indoor environment for people.The cooling metering of central air conditioning as far back as the eighties of last century later stage nineties just the someone propose.Measure can promote to save the heating energy consumption as the heating system household measurement heat-supplying, and the central air-conditioning system cooling metering is for the building energy conservation that uses central air-conditioning system, and is especially self-evident for the meaning of the building energy conservation of China's southern area.In addition, central air-conditioning system adopts after the method for cooling metering, also helps to solve the intrinsic disadvantage that is present in administration departments for a long time.Because using the major part building of central air conditioning is public building and business premises, frequent problem with regard to the cold charge of idle call produces dispute between infrastructure management company and the user, yet, be not only the user, know that it is irrational that central air conditioning adopts present charge way even infrastructure management company is also clear.
The present situation of China's cooling metering is again what kind of generally speaking has three kinds of situations so: the one, and the office block of enterprises and institutions, the building of going up central air conditioner in these buildings all do not have the measure of cooling metering, and the air-conditioning expense all is to be spread out on state's head; The 2nd, hire out (selling) business premises, major part has central air conditioner system in these building, and the air-conditioning expense has then been taked to collect according to the way that area is shared; The 3rd, residential housing, owing to divide the distinct characteristics at family, air-conditioning system mostly is a family one system greatly, so just can adopt the mode of calorimeter to carry out household metering by a family one cold table, also all utilizes this form to measure mostly in the dwelling house of employing central air conditioner.The problem that preceding two kinds of situations are brought be with many with few samples, use with need not a sample, caused great energy dissipation.And the research of this project is just at the air-conditioning system of preceding two kinds of situations.No matter be from energy-conservation angle, or estate management or air-conditioning system operation adjusting angle, the air-conditioning metering all will become the means an of necessity.
Write building hollow adjusting system great majority of public building and commerce are fan coil system, because the singularity of in these buildings, hiring out or selling, make air-conditioning system when design, just can't design, therefore also make the air-conditioning system in these building to measure according to the user according to the principle that the user separates.If consider that it is very unpractical that every typhoon coiler is installed the flowmeter survey cold, because the price of a flowmeter exceeds much than the price of a typhoon coiler, and flowmeter is bigger to water system destruction, makes complexity is installed, increased the leakage point of system, it is difficult that maintenance also becomes.In this case, if a kind of device that measures from the wind side is arranged, the parameter that only needs to measure the wind side just can be counted and get cold, and no matter how the cold influence factor and the water system of water side are divided, is undoubtedly the product of market demand.
2.1 domestic research
About capacity metering method, domestic have area index measurement Law, chronometry, two temperature flowmeter method, room heat balance method at present.
(1) so-called area index measurement Law is estimated user's cold according to area refrigeration duty index exactly, this method is not taked any metering outfit, it is simple to charge, it is convenient to use, shortcoming is because actual condition and design conditions have very big-difference, and to cause this method be very rough method to the unit area of different operating time with variant between the cold, needs during application adjust up to reasonable substantially according to charge experience for many years.
(2) timing rule is the gear signal when detecting fan coil and open, get the fan coil gear the nominal refrigerating capacity of corresponding fan coil as the consumption cold of fan coil, measure the cold of fan coil by accumulated time.This metering method can reflect each user's air-conditioning operating position, and technical simple, and certain confidence level is arranged; Its weak point is that error in dipping is bigger, changes the influence to cold as not considering water system fluctuations in discharge and supply water temperature.When practical application, the way that also has employing refrigerating capacity to be revised according to the fan coil return air temperature.
(3) two temperature flowmeter methods are by in the water side flowmeter and a pair of temperature sensor being installed, being passed through formula Q = ∫ 1 t 2 m c p Δt w dt Calculate the way (being similar to calorimetric principle) of cold.The advantage of this method is the measuring accuracy height, and is in theory very perfect, and shortcoming then is that initial cost is big, is difficult to safeguard, and need changes air-conditioner water system when installing.
(4) room heat balance method is to adopt the most basic air-conditioning and construction thermodynamic model that the instantaneous cold/thermal load of air-conditioned room is carried out Theoretical Calculation, with this as air-conditioning and construction cold/foundation of heat metering, this method needs monitoring indoor and outdoor air themperature and intensity of solar radiation in real time.The two warm flowmeter methods of this method output investment ratio are low, but shortcoming is may bring than mistake under the situation that the on time lacks or the switching on and shutting down frequency is high indoor thermal source detail knowledge and setting, only are applicable to that indoor thermal source changes very little dwelling house or office building.
For fan coil cooling unit, other three kinds of methods of removing two warm flowmeter methods are all available, but these three kinds of methods or experienced correction interior, or the part of hypothesis is too many, its common drawback all is that the error of bringing is too big.This project promptly is the angle from theory, but finds out the metering method that the little measuring accuracy of initial cost is higher than these three kinds of methods.
The work of this respect was once done by present Tsing-Hua University, and developed Related product, but the research core of this project has difference with it.What Tsing-Hua University did is to look for the Several Parameters of air side and the experiment relational expression between the cold, then it is measured, and the research of this project is to calculate cold according to wind side enthalpy potential method, theoretical foundation is stronger, in addition according to the thought of wind side enthalpy potential method metering fan coil cold, domesticly yet there are no pertinent literature or research.
2.2 foreign study
External very few for the research of cooling metering aspect, major part all is the research of Northern European countries heat metering aspect about metering, and the employing cooling metering also all is to adopt with hot metering similar methods with the flowmeter method system's cold to be measured.Do not see correlative study abroad as for the fan coil system metering method.
The utility model content
The utility model will solve the defective of above-mentioned prior art, provides a kind of use of regenerating, the cost allocation device of lower-cost office buildings central air conditioner fan coil.
The utility model solves the technical scheme that its technical matters adopts.The cost allocation device of this office buildings central air conditioner fan coil mainly comprises a fan coil message accounting and a district management machine.The fan coil message accounting comprises a microprocessor, communication module, data acquisition module, output control module, data presentation human-machine operation module and power module, power module provides the operating voltage of the required all size of message accounting, and the fan coil message accounting sends to data on the district management machine by communication module and AB line; The P2 mouth of fan coil message accounting drives charactron for showing and the output control interface by the 74LS07 signal, simultaneously, latchs the output of rear drive controllable silicon by 74LS374; P0.5, P1.7, the three-way A with 74LS138 of P3.1, B, C and chip select line connect, and form the 4-16 code translator; The output gating charactron and the button of code translator latch controllable silicon output; The P0 mouth of device is the signals collecting single port, and the output terminal of temperature sensor and humidity sensor is connected with 4051 multi-way switchs after by electric resistance partial pressure, and the output of 4051 multi-way switchs is connected to P0.1, P0.2; The P1 mouth of device is the signal controlling mouth.Fan operation power input, the operating voltage of blower fan and working current are converted into blower fan by ATT7021 actual motion power carries out the power counting with pulse mode through the laggard P1.3 that goes into microprocessor of photoelectricity coupling.Microprocessor carries out energy meter according to the heat exchange principle of fan coil and the heat balance equation of surface cooler, and calculates user's real-time energy cost according to the rate of setting.And with the RXD of result by microprocessor, the RXD of TXD and RS485, TXD connects, and sends on district management machine or the host computer by the AB line, realizes robotization, intellectuality and the digitizing of chargeing and checking meter.Microprocessor also can be P89LPC934, and P89LPC933, P89LPC932 etc. fly sharp Pu LPC900 series microprocessor, and communication module also can be SN75LBC184 and 485 communication family chips.
District management machine described in the utility model contains two microprocessors, a numerical value display interface.Microprocessor CPU 1 is in charge of and mostly is 32 typhoon coiler taximeters most, regularly reads each typhoon coiler and is saved in the data storing module with the service data of taximeter, and send to display interface by serial port.Mail to microprocessor CPU 2 by parallel bus.Microprocessor CPU 2 is responsible for upper with mailing to by Ethernet after the packing data.The P0 of microprocessor CPU 1, P2, P1 mouth form 22 bit address buses and 8 bit data bus.Articulated 32KRAM and 2M at storer on bus, the P3 mouth is a serial communication port, serial line interface RXD, and TXD forms RS232 interface and the output of RS485 interface by multi-way switch conversion back by RS232 and 75176 conversion backs.The P0 of microprocessor CPU 2, P2 mouth form 16 bit address buses and 8 bit data bus.Articulated 32KRAM and Ethernet interface chip on bus, the P3 mouth is a serial communication port, serial line interface RXD, and TXD forms RS232 interface and the output of RS485 interface by multi-way switch conversion back by RS232 and 75176 conversion backs.Microprocessor CPU 1 and microprocessor CPU 2 link to each other by 74LS245.。The microprocessor of the district management machine of fan coil is 51 series monolithics, comprises 89C52,89C55, and W78E58 etc., communication module adopts 232 communication family chips and 485 communication family chips and ethernet interface chip.System adopts and makes watchdog technique, guarantees the ground operation of district management machine normal reliable.
The novel measuring principle that adopts of this implementation:
According to consulting document and the part Study work carried out in early stage, the mode of preparing to adopt enthalpy potential method to calculate cold in the research of this project is measured terminal cold.Below the enthalpy difference ratio juris is simply introduced.
The principle of enthalpy potential method foundation is the computing formula of wind side refrigerating capacity
Q＝G·(i 2-i 1)
Wherein, G is the air quantity of fan coil, i 1, i 2It is respectively the enthalpy that coil pipe is imported and exported air.
Adopt enthalpy potential method to calculate the cold of fan coil, the calculated amount that needs has three, i.e. G, i 1, i 2, and i 1, i 2Need to measure the temperature t of importing and exporting air again 1, t 2With humidity φ 1, φ 2Just can calculate.Like this, all the amount that need measure has 5, that is: G, t 1, t 2, φ 1, φ 2Here to use the relevant knowledge that soft air is learned, calculate cold from the partial parameters of the soft air that records and calculate needed enthalpy of humid air value.
Air quantity G can consider that three kinds of methods measure: (1) obtains the size of air quantity by the method that reads gear; (2) by measuring the method for electric current, find out the relation between air quantity and the electric current, thereby this easily measures airflow value by electric current; (3) by surveying the method for wind speed, seek the mean wind speed point on the air-out section, calculate air quantity with the wind speed method.In method 2 when experiment airflow value under measuring various operating modes, measure current value by current measuring device simultaneously by the coil pipe blower fan, find relational expression between the two by the method that returns; Again because air quantity except relevant with current of electric, also be subjected to the influence of wind collateral resistance, and can not obtain wind collateral resistance accurately in the reality, constitute by on-way resistance and shock resistance according to the wind collateral resistance, and all directly dynamic head of the wind-engaging side influences of this two parts resistance, so can consider by the setting mean wind speed of coil pipe the relational expression correction of air quantity and electric current to be reduced the deviation of Wind Coverage Calculation with the wind side, though this setting mean wind speed is not real mean wind speed, the Wind Coverage Calculation accuracy is still meaningful for improving.
The humiture of inlet air, override formats that can be different according to coil pipe (mainly considering the different of the difference of air return method and new wind access way) is indoor or record at the return air inlet place.As for the humiture of outlet air, because the air-out air condition of surface cooler is inhomogeneous,, key issue is provided with so being the position that exports measuring point, promptly measuring point should be able to be represented the equalization point of air-out section air condition.Principal element to the influence of surface cooler air-out measuring point is the arrangement of coil surface temperature distribution and coil pipe inner conduit, can consider that analysis result can be used experiment show aspect these two when analyzing.
The advantage of enthalpy potential method is that measuring principle is simple, and is applied widely, restricted few.Difficult point is that the searching of point position acquires a certain degree of difficulty, and this position is bigger to accuracy of measuring influence.
After the problem of terminal cooling metering solves, in fan coil system, can record all terminal colds, measure cold in the ratio of always measuring in the cold according to end, multiply by the actual general refrigeration ability that water side, refrigerating plant room place method is measured, promptly draw terminal actual consumption cold.For example, use Q iRepresent terminal actual refrigerating capacity, ∑ Q iWith the refrigerating capacity of representing that the refrigerating plant room place is actual total, use Q iThe terminal cold that the measuring apparatus that ' expression is developed is measured is used ∑ Q iAll measure terminal cold sum ' expression, and cold calculates
Formula can be represented with following formula:
Q i = ( ∑ Q i ) × Q i ′ ∑ Q i ′
Wherein, ∑ Q iBe to locate total actual refrigerating capacity of recording with flowmeter and a pair of temperature sensor the house steward of system, Then be the terminal refrigerating capacity of measuring with the enthalpy difference measuring apparatus, Be the summation of measuring cold of all enthalpy difference measuring apparatus of obtaining by the metering system computed in software, and the Q that calculates iThe cold of using that needs the user that shows endways exactly.Whole metering, calculating, data transmission all are real-time processes, and terminal measuring apparatus also needs to be furnished with the accumulated time device, like this, just can show at user side with real-time cold, accumulation cold, cold unit price, with whiles such as cold expenses.
The effect that the utility model is useful is:
1, fee counter function is complete, unites two into one with controller of fan, and cost of investment is lower, the cost performance height.
2, taximeter is offered an explanation cold and hot operating mode automatically, and the energy value of accumulation is that the actual of user promptly overcome the big shortcoming of time deviation of mechanical energy table and long-pending up-to-date style energy meter with can value, does not have the high capital input of water survey mode energy meter again.
3, the embedded intelligent program of taximeter guarantees that meter can occur in using in the energy process of user, does not produce invalid charging process.Relax confession, needed both sides' contradiction, be convenient to management.
4, the mode that equipment promptly can separate unit is worked, and also may realize many connection by network.Can be embedded into easily in the intelligent building system.
5, microprocessor integrated level height, embedded watchdog function, clocking capability effectively guarantees the degree of stability of equipment work and the precision of timing.
6, reduced the influence of terminal measuring apparatus deviation to the charging fairness, this metering method all has substantial meaning to efficiency management and system's operational management simultaneously.
Description of drawings
Fig. 1 is embodiment 1 a central air conditioner message accounting structural representation of the present utility model;
Fig. 2 is embodiment 1 fan coil message accounting circuit theory synoptic diagram a of the present utility model;
Fig. 3 is embodiment 1 fan coil message accounting circuit theory synoptic diagram b of the present utility model;
Fig. 4 is a district management machine circuit principle schematic among the embodiment 1 of the present utility model;
Embodiment
Below in conjunction with drawings and Examples the utility model is described further:
Embodiment 1, referring to Fig. 1, charge system is chargeed by a district management and Duo Tai (being 32 to the maximum) fan coil and water side error corrector is formed.The fan coil taximeter is gathered the import and export humiture and the power of fan of blower fan, carry out energy meter according to the heat exchange principle of fan coil and the heat balance equation of surface cooler, and data are mail on the district management machine by the RS485 bus, the user can inquire about the running status of each typhoon machine and use energy by display interface on district management, can data be transferred on the computing machine by meter-copy device simultaneously.
The cost allocation device of this office buildings central air conditioner fan coil described in the utility model mainly comprises a fan coil message accounting and a district management machine.The fan coil message accounting comprises a microprocessor, communication module, data acquisition module, output control module, data presentation human-machine operation module and power module, power module provides the operating voltage of the required all size of message accounting, and the fan coil message accounting sends to data on the district management machine by communication module and AB line; The P2 mouth of fan coil message accounting drives charactron for showing and the output control interface by the 74LS07 signal, simultaneously, latchs the output of rear drive controllable silicon by 74LS374; P0.5, P1.7, the three-way A with 74LS138 of P3.1, B, C and chip select line connect, and form the 4-16 code translator; The output gating charactron and the button of code translator latch controllable silicon output; The P0 mouth of device is the signals collecting single port, and the output terminal of temperature sensor and humidity sensor is connected with 4051 multi-way switchs after by electric resistance partial pressure, and the output of 4051 multi-way switchs is connected to P0.1, P0.2; The P1 mouth of device is the signal controlling mouth.Fan operation power input, the operating voltage of blower fan and working current are converted into blower fan by ATT7021 actual motion power carries out the power counting with pulse mode through the laggard P1.3 that goes into microprocessor of photoelectricity coupling.Microprocessor carries out energy meter according to the heat exchange principle of fan coil and the heat balance equation of surface cooler, and calculates user's real-time energy cost according to the rate of setting.And with the RXD of result by microprocessor, the RXD of TXD and RS485, TXD connects, and sends on district management machine or the host computer by the AB line, realizes robotization, intellectuality and the digitizing of chargeing and checking meter.Microprocessor also can be P89LPC934, and P89LPC933, P89LPC932 etc. fly sharp Pu LPC900 series microprocessor, and communication module also can be SN75LBC184 and 485 communication family chips.
District management machine described in the utility model contains two microprocessors, a numerical value display interface.Microprocessor CPU 1 is in charge of and mostly is 32 typhoon coiler taximeters most, regularly reads each typhoon coiler and is saved in the data storing module with the service data of taximeter, and send to display interface by serial port.Mail to microprocessor CPU 2 by parallel bus.Microprocessor CPU 2 is responsible for upper with mailing to by Ethernet after the packing data.The P0 of microprocessor CPU 1, P2, P1 mouth form 22 bit address buses and 8 bit data bus.Articulated 32KRAM and 2M at storer on bus, the P3 mouth is a serial communication port, serial line interface RXD, and TXD forms RS232 interface and the output of RS485 interface by multi-way switch conversion back by RS232 and 75176 conversion backs.The P0 of microprocessor CPU 2, P2 mouth form 16 bit address buses and 8 bit data bus.Articulated 32KRAM and Ethernet interface chip on bus, the P3 mouth is a serial communication port, serial line interface RXD, and TXD forms RS232 interface and the output of RS485 interface by multi-way switch conversion back by RS232 and 75176 conversion backs.Microprocessor CPU 1 and microprocessor CPU 2 link to each other by 74LS245.The microprocessor of the district management machine of fan coil is 51 series monolithics, comprises 89C52,89C55, and W78E58 etc., communication module adopts 232 communication family chips and 485 communication family chips and ethernet interface chip.System adopts and makes watchdog technique, guarantees the ground operation of district management machine normal reliable.
The novel measuring principle that adopts of this implementation:
According to consulting document and the part Study work carried out in early stage, the mode of preparing to adopt enthalpy potential method to calculate cold in the research of this project is measured terminal cold.Below the enthalpy difference ratio juris is simply introduced.
The principle of enthalpy potential method foundation is the computing formula of wind side refrigerating capacity
Q＝G·(i 2-i 1)
Wherein, G is the air quantity of fan coil, i 1, i 2It is respectively the enthalpy that coil pipe is imported and exported air.
Adopt enthalpy potential method to calculate the cold of fan coil, the calculated amount that needs has three, i.e. G, i 1, i 2, and i 1, i 2Need to measure the temperature t of importing and exporting air again 1, t 2With humidity φ 1, φ 2Just can calculate.Like this, all the amount that need measure has 5, that is: G, t 1, t 2, φ 1, φ 2Here to use the relevant knowledge that soft air is learned, calculate cold from the partial parameters of the soft air that records and calculate needed enthalpy of humid air value.
Air quantity G can consider that three kinds of methods measure: (1) obtains the size of air quantity by the method that reads gear; (2) by measuring the method for electric current, find out the relation between air quantity and the electric current, thereby this easily measures airflow value by electric current; (3) by surveying the method for wind speed, seek the mean wind speed point on the air-out section, calculate air quantity with the wind speed method.In method 2 when experiment airflow value under measuring various operating modes, measure current value by current measuring device simultaneously by the coil pipe blower fan, find relational expression between the two by the method that returns; Again because air quantity except relevant with current of electric, also be subjected to the influence of wind collateral resistance, and can not obtain wind collateral resistance accurately in the reality, constitute by on-way resistance and shock resistance according to the wind collateral resistance, and all directly dynamic head of the wind-engaging side influences of this two parts resistance, so can consider by the setting mean wind speed of coil pipe the relational expression correction of air quantity and electric current to be reduced the deviation of Wind Coverage Calculation with the wind side, though this setting mean wind speed is not real mean wind speed, the Wind Coverage Calculation accuracy is still meaningful for improving.
The humiture of inlet air, override formats that can be different according to coil pipe (mainly considering the different of the difference of air return method and new wind access way) is indoor or record at the return air inlet place.As for the humiture of outlet air, because the air-out air condition of surface cooler is inhomogeneous,, key issue is provided with so being the position that exports measuring point, promptly measuring point should be able to be represented the equalization point of air-out section air condition.Principal element to the influence of surface cooler air-out measuring point is the arrangement of coil surface temperature distribution and coil pipe inner conduit, can consider that analysis result can be used experiment show aspect these two when analyzing.
The advantage of enthalpy potential method is that measuring principle is simple, and is applied widely, restricted few.Difficult point is that the searching of point position acquires a certain degree of difficulty, and this position is bigger to accuracy of measuring influence.
After the problem of terminal cooling metering solves, in fan coil system, can record all terminal colds, measure cold in the ratio of always measuring in the cold according to end, multiply by the actual general refrigeration ability that water side, refrigerating plant room place method is measured, promptly draw terminal actual consumption cold.For example, use Q iRepresent terminal actual refrigerating capacity, ∑ Q iWith the refrigerating capacity of representing that the refrigerating plant room place is actual total, use The terminal cold that the measuring apparatus that expression is developed is measured is used Represent that all measure terminal cold sum, the formula that cold calculates can be represented with following formula:
Q i = ( ∑ Q i ) × Q i ′ ∑ Q i ′
Wherein, ∑ Q iBe to locate total actual refrigerating capacity of recording with flowmeter and a pair of temperature sensor the house steward of system,
Figure Y20042009032400124
Then be the terminal refrigerating capacity of measuring with the enthalpy difference measuring apparatus,
Figure Y20042009032400125
Be the summation of measuring cold of all enthalpy difference measuring apparatus of obtaining by the metering system computed in software, and the Q that calculates iThe cold of using that needs the user that shows endways exactly.Whole metering, calculating, data transmission all are real-time processes, and terminal measuring apparatus also needs to be furnished with the accumulated time device, like this, just can show at user side with real-time cold, accumulation cold, cold unit price, with whiles such as cold expenses.
Embodiment 2, charge system be by a computing machine, and some district management machines and Duo Tai (greater than 32) fan coil taximeter and water side error corrector are formed.The fan coil taximeter is gathered the import and export humiture and the power of fan of blower fan, fan coil charges and links to each other with the district management machine by RS485, the district management machine is then formed network by Ethernet and computing machine, on host computer, the user can carry out the group to fan coil by upper account software, many rate accountings, operations such as output report.
Embodiment 3, charge system be by a computing machine, and some district management machines and Duo Tai (greater than 32) fan coil taximeter and water side error corrector are formed.The fan coil taximeter is gathered the import and export humiture and the power of fan of blower fan, fan coil charges and links to each other with the district management machine by RS485, the district management machine is formed network by RS485 and computing machine, on host computer, the user can carry out the group to fan coil by upper account software, many rate accountings, operations such as output report.
Embodiment 4, charge system be by a computing machine, and some district management machines and Duo Tai (greater than 32) fan coil taximeter and water side error corrector are formed.The fan coil taximeter is gathered the import and export humiture and the power of fan of blower fan, fan coil charges and links to each other with the district management machine by RS485, the district management machine is formed network by GPRS and computing machine, on host computer, the user can carry out the group to fan coil by upper account software, many rate accountings, operations such as output report.

Claims (7)

1, a kind of cost allocation device of office buildings central air conditioner fan coil, mainly comprise a fan coil message accounting and a district management machine, it is characterized in that: the fan coil message accounting comprises a microprocessor, communication module, data acquisition module, output control module, data presentation human-machine operation module and power module, power module provides the operating voltage of the required all size of message accounting, and the fan coil message accounting sends to data on the district management machine by communication module and AB line; The P2 mouth of fan coil message accounting drives charactron for showing and the output control interface by the 74LS07 signal, simultaneously, latchs the output of rear drive controllable silicon by 74LS374; P0.5, P1.7, the three-way A with 74LS138 of P3.1, B, C and chip select line connect, and form the 4-16 code translator; The output gating charactron and the button of code translator latch controllable silicon output; The P0 mouth of device is the signals collecting single port, and the output terminal of temperature sensor and humidity sensor is connected with 4051 multi-way switchs after by electric resistance partial pressure, and the output of 4051 multi-way switchs is connected to P0.1, P0.2; The P1 mouth of device is the signal controlling mouth.
2, the cost allocation device of office buildings central air conditioner fan coil according to claim 1, it is characterized in that: described district management machine contains two microprocessors, the serial port of microprocessor CPU 1 is connected with data presentation human-machine operation module, and parallel bus is connected with microprocessor CPU 2; Microprocessor CPU 1 is in charge of one group of fan coil taximeter, regularly reads each typhoon coiler and is saved in the data storing module with the service data of taximeter; Microprocessor CPU 2 is responsible for upper with mailing to by Ethernet after the packing data.
3, the cost allocation device of office buildings central air conditioner fan coil according to claim 2, it is characterized in that: the P0 of institute's microprocessor CPU 1, P2, the P1 mouth is formed 22 bit address buses and 8 bit data bus, 32KRAM and 2M on bus, have been articulated at storer, the P3 mouth is a serial communication port, serial line interface RXD, and TXD forms RS232 interface and the output of RS485 interface by multi-way switch conversion back by RS232 and 75176 conversion backs; The P0 of microprocessor CPU 2, the P2 mouth is formed 16 bit address buses and 8 bit data bus, 32KRAM and Ethernet interface chip on bus, have been articulated, the P3 mouth is a serial communication port, serial line interface RXD, TXD forms RS232 interface and the output of RS485 interface by multi-way switch conversion back by RS232 and 75176 conversion backs; The P0 of microprocessor CPU 2, the P2 mouth is formed 16 bit address buses and 8 bit data bus, 32KRAM and Ethernet interface chip on bus, have been articulated, the P3 mouth is a serial communication port, serial line interface RXD, TXD forms RS232 interface and the output of RS485 interface by multi-way switch conversion back by RS232 and 75176 conversion backs; Microprocessor CPU 1 and microprocessor CPU 2 link to each other by 74LS245.
4, according to claim 2 or the 3 described central air conditioner regional supervisor that charges, it is characterized in that: microprocessor also can be 89C55, W78E58, W77E58, P89C51RD+51 series microprocessor; Communication module also can be 485 communication family chips, 232 communication family chips, ethernet communication family chip.
5, the cost allocation device of office buildings central air conditioner fan coil according to claim 1, it is characterized in that: microprocessor is P89LPC935, communication module is 75176, P89LPC has P2 to connect demonstration and output module, the P0 mouth connects temperature and humidity acquisition module, the RXD of P1 mouth, TXD and 75176 RXD, TXD connects.
6, the cost allocation device of office buildings central air conditioner fan coil according to claim 1, it is characterized in that: microprocessor also can be P89LPC934, P89LPC933, P89LPC932 etc. fly sharp Pu LPC900 series microprocessor, and communication module also can be SN75LBC184 and 485 communication family chips.
7, the cost allocation device of office buildings central air conditioner fan coil according to claim 1, it is characterized in that: the input of three tunnel temperature, be respectively the coil pipe inlet temperature, the coil pipe outlet temperature, indoor temperature, the input of No. one coil pipe outlet moisture signal, more than the input end of four kinds of signals strengthen after 4051 multi-way switchs are connected with the AD conversion port of microprocessor by resistor network.
CNU2004200903240U 2004-09-22 2004-09-22 Cost allocation device for central air-conditioner draught fan coil pipe in office buildings Expired - Fee Related CN2745035Y (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100385205C (en) * 2006-03-01 2008-04-30 李云奇 Non-contact type heating and cooling two-purpose intelligent control individual household metering device for central heating
CN102494809A (en) * 2011-11-29 2012-06-13 杨世忠 Enthalpy measuring and charging method of VAV air conditioner, measuring apparatus and control system thereof
CN106706986A (en) * 2017-03-03 2017-05-24 上海开装建筑科技有限公司 Low-cost split charging system of multi-split central air conditioning indoor unit
CN113883693A (en) * 2021-10-28 2022-01-04 湖北合合能源科技发展有限公司 Metering method of centralized central air-conditioning system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100385205C (en) * 2006-03-01 2008-04-30 李云奇 Non-contact type heating and cooling two-purpose intelligent control individual household metering device for central heating
CN102494809A (en) * 2011-11-29 2012-06-13 杨世忠 Enthalpy measuring and charging method of VAV air conditioner, measuring apparatus and control system thereof
CN102494809B (en) * 2011-11-29 2015-01-14 青岛理工大学 Enthalpy measuring and charging method of VAV air conditioner
CN106706986A (en) * 2017-03-03 2017-05-24 上海开装建筑科技有限公司 Low-cost split charging system of multi-split central air conditioning indoor unit
CN106706986B (en) * 2017-03-03 2024-03-12 上海开装建筑科技有限公司 Low-cost one-to-many central air conditioner indoor unit sharing charging system
CN113883693A (en) * 2021-10-28 2022-01-04 湖北合合能源科技发展有限公司 Metering method of centralized central air-conditioning system

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