Beijing West Station Central Air Conditioning Temperature and Humidity Monitoring Retrofit System Solution
Modification purpose: For HVAC projects, there should be more detailed calculations of cooling and heating loads and those that have been adopted. Previously, many designers had repeatedly increased their estimates to make cold and hot hosts under low-load and low-efficiency. Determination of the temperature of HVAC interior design Practices in Chongqing, Shanghai, and Guangzhou have proved that summer indoor temperatures are one degree lower or winter temperatures are one degree higher. In addition to the increase of investment in HVAC projects by 6%-8%, the increase in indoor and outdoor temperature difference is not Meets hygiene requirements. Comfortable air conditioning The ideal indoor temperature in summer is 5-8 degrees below the outdoor temperature . Central air-conditioning energy consumption generally includes three parts, namely: a cooling and heat source of air-conditioning unit b air-conditioning unit end equipment; c water or air delivery system. Among these three parts of energy consumption, the energy consumption of cold and heat sources accounts for about half of the total energy consumption, which is an important content of air-conditioning energy conservation. This system is mainly aimed at the control and reconstruction of air-conditioning cooling and heating sources. Existing air-conditioning compressors and other major equipment can continue to be used without replacement. In order to reduce the cost of air conditioning reform. System function introduction: The system field instrument JCJ500B/ computer serial port control output card collects the temperature and humidity of the temperature / humidity inlet / water pipe at different points in the HVAC pipe and sends it to the central monitoring room through the 485 bus. The computer in the central monitoring room then passes through. The serial control board controls the corresponding actuators such as electric cutting, frequency converter, and compressor, and automatically closes the loop according to the set temperature and humidity of the computer. All the temperature and humidity data collected by the computer can be displayed on the computer. At the same time, real-time curves and historical curves can be displayed, and historical records can be saved. Data reports can be automatically generated for storage and printing. The user can also export all previous historical temperature data at any time. for reference. The adoption of this automatic control system can greatly reduce the supervision and operation personnel of air conditioners, and at the same time can make the air conditioner compressor start / stop reasonably so as to achieve high-efficiency cooling and heating effects, and at the same time achieve energy-saving effects. System composition introduction: ☆     JCJ100B temperature and humidity sensor JCJ100B duct type temperature and humidity transmitter, the temperature part of the imported film platinum resistance Pt100 as a temperature sensor, humidity sensor using a patented solid polymer structure of the humidity sensing capacitor element. The product adopts scientific and reasonable circuit design. JUCSAN ® series transmitters adopt DC voltage and current forms that have been approved by customers. They are used with JCJ300A , JCJ300B , JCJ500B , JCJ600B and other instruments of Jiuchunjian Technology . Duct-type temperature and humidity transmitter is very suitable for measuring temperature and humidity measurement in various places suitable for pipeline installation, such as air duct, flue gas pipeline, airtight container, central air conditioning inlet and outlet. Jucsan@ temperature and humidity transmitter selects DC voltage or current output form that has been widely recognized by customers. It can directly connect with Jiu Chunjian @ series secondary instrument ( JCJ600A temperature and humidity measurement and control instrument or JCJ600B dual-channel measurement and control instrument ) or acquisition card. Technical Parameters: Working power: 12VDC±10% 12VAC±10% 24VDC±10% 24VAC±10% Other working power (note) Transmitter power consumption reference: Current signal: 24V/45mA ( 0 to 5 ) VDC : 12V/35mA ( 0 to 10 ) VDC : 24V/35mA working environment Humidity: 5 ~ 95% RH non-condensing Temperature: -20 ~ 60 ℃ Transmitter material: ABS plastic waterproof housing  Size: 100 × 68 × 50mm Color: Milky white    Weight: not less than 200g Ann  Fitting : Pipeline ( JCJ100BC for threaded mounting, JCJ100BD for in-line fixed mounting, JCJ100BE for movable flange mounting) Temperature parameter   Temperature sensor: platinum resistance Pt100 Temperature measurement range: ( 0 ~ 50 ) °C,   ( 0 to 60 )°C, ( -20 to 60 ) °C ,   Other specified Accuracy: Better than ±0.5 °C (0 to 50 °C ) Humidity Sensor: Humidity Capacitor with Solid Polymer Structure with Patented Technology Operating temperature: -20 to 60°C reaction time ( ta ): typical value < 5s Long-term stability:  Typical value 0.5% RH/ year Probe protection: metal powder metallurgy sintering filter, which can protect the sensor, but also has a breathable dust, easy to measure. Effective measurement range: 10% to 95% RH Corresponding range of signal output: 0 to 100% RH Accuracy: ± 3% RH ( 20 to 95%RH, 20°C without condensation) ±2% RH ( 20 to 95%RH, 20°C , no condensation) output signal: Voltage signals: 1 , ( 0 to 5 ) VDC 2 , ( 0 to 10 ) VDC 3 , ( 0 to 1 ) VDC Current signal: 4 , ( 4 to 20 ) mA (three-wire system) 5 , ( 0 to 10 ) mA 6 , ( 0 to 20 ) mA Measurement stability: Humidity measurement: Normally, the drift is no more than 1% RH Load capacity: Voltage type: ≥1KΩ Current type: 0 to 500 Ω ☆ JCJ500B intelligent temperature inspection instrument Adopting advanced software and hardware design, it can generally inspect 1 to 16 channels of temperature and humidity measurement signals. Receiving voltage or current or other signal, the instrument realizes input signal, measurement range, and report by setting internal parameters. Alarm value, alarm hysteresis, error calibration, communication, printing and other function settings. The meter can achieve multiple temperatures, Humidity, pressure, liquid level, flow, and other physical quantities of touring inspection. JCJ500B intelligent temperature inspection instrument can be used as data acquisition equipment. It can realize the maximum of 100 instruments on-line work. Through the supporting software or users according to the communication protocol to develop a feature-rich data monitoring system. Basic parameters : Operating power: 90 to 265VAC (switching power supply) or 24VDC ± 10% Input signal: standard current 0 to 10mA , 4 to 20mA , 0 to 20mA Standard voltage 0 to 5V , 1 to 5V , 0 to 10V Thermocouple K, S, B, T, E, J, N, WRE Thermal resistance Pt100, Pt1000, Cu50, Cu100 Measurement accuracy: 0.2%FS±1 words Display range: -1999 to 9999 Display: double four LED display The upper row shows the measured value ( 0.8 inch) and the lower row shows the channel number ( 0.56 inch) Light-emitting diodes indicate the alarm status of each channel (lights indicate alarm status) Temperature compensation: 0 to 50°C cold junction temperature compensation Instrument range over limit or input signal disconnection instrument alarm Communication baud rate: 300 to 9600bps internal free setting Mailing address: 0 ~ 99  System topology diagram Computer Software Description: Temperature monitoring software to Century Star \ Kingview such as Standard Edition software to run configuration software platform, which is long-term and stable software The operation provides a guarantee, is a feature-rich, stable performance of temperature and humidity monitoring software. The main functions of the software are as follows: Easy to install: The software is easy to install, just click " Setup.exe" to run and complete the installation. Through simple settings, you can use it. A variety of interfaces : real-time digital display, real-time curves, historical curves, data reports, configuration reports and other data display. Flexible configuration: The screen, text and curve can be flexibly configured according to the measurement requirements. The picture is vivid and vivid. Data storage : automatic data storage, data export (save as) Excel , TXT and other file formats. Data Printing : Supports report printing, historical curve printing, and printing in Excel . Data query : By inputting the query time, you can query the data record and curve record corresponding to the required point during the measurement. Monitoring alarm : When the monitored value reaches the alarm condition, an alarm is issued by changing the color of the corresponding data. Stable and accurate : The software runs stably, has strong anti-interference ability, high data acquisition accuracy, and meets high standard data monitoring requirements. Self-developed: The system uses Modbus_RTU protocol, which can be configured using a variety of configuration software. Users can select other configuration software to configure according to their needs. Various functions can be added according to their needs. The system function is completely determined by the user's needs. Control setting: You can set the control output limit yourself or use the calculated data as the control line value.  Conclusion: The system has been successfully applied in the air conditioning renovation project of the Beijing West Railway Station.
Overview
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