I. Abstract
In the blood ward, the requirements for temperature, humidity and light are quite high. In order to improve the degree of automation, a temperature and humidity monitoring system is added to the air conditioning system of the blood ward of a hospital in Shanghai. It adopts 15-inch Taiwan Willenton touch screen as the upper computer, and Hongrun NHR series instrument as the data collection and control output. It realizes the real-time collection and display of temperature, humidity and various switching quantities of air-conditioning units, chiller units, auxiliary rooms and various wards.
Second, the product's market background
From the human body's thermal comfort and health, the indoor temperature, humidity and illumination to carry out comprehensive control. The traditional air conditioning system using temperature and humidity joint processing there are many drawbacks; first of all, after condensation and dehumidification of the air, although the humidity to meet the requirements, but the temperature is too low, and sometimes need to re-heat, resulting in a waste of energy and loss; secondly, through the condensing method of cooling and dehumidification of the air, it is difficult to adapt to the actual indoor humidity/heat ratio of the changes, affecting the indoor thermal comfort; and finally, through the table cooler to the air to cool down the dehumidification of temperature The air conditioning system can easily cause mold growth and spread through the air conditioning system, resulting in the degradation of indoor air quality. The new independently designed air-conditioning system, for different climatic conditions, different types of buildings, combined with energy-saving hotspots, through the use of fresh air to take on the exclusion of indoor residual humidity, CO2, as well as odors of people and things, in order to ensure the quality of indoor air; indoor sensible heat is excluded (or supplemented) through a separate system, which effectively avoids the problems that existed in the traditional traditional air-conditioning system when the heat and humidity are handled jointly. From the perspective of automation control, the temperature and humidity monitoring system is added to the air-conditioning system, which can effectively solve the energy management and improve the comfort of the wards. The following is the application of Hongrun NHR series instruments in the temperature and humidity monitoring system of blood ward.
Three, the product's technical principles
1, the system's hardware components.
The hardware composition of the system is shown in Figure 1.
Figure 1: System Block Diagram
2, the system function
1) temperature and humidity control automatic/manual switching function;
2) fan operation/standby switching control;
3) patient check-in disinfection mutual interlocking control: stop, ready, self-cleaning, check-in;
4) remote adjustment of the ward lighting;
5) Ward leakage alarm function;
6) Willenton touch screen is responsible for all the instruments connected to the industrial site for a full range of monitoring, data collection and processing of various matters.
Four, the application of the product
1, Willenton touch screen control.
Willenton touch screen can realize the centralized management and decentralized control of the system, which is convenient for the management of the leadership, it adopts RS-485 communication between it and the NHR series of instruments, which has the characteristics of long signal transmission distance, strong anti-interference ability and high stability. Willenton touch screen control screen shown in Figure 2.
Figure 2: Valiant touch screen control screen
2, the system configuration
1) touch screen
Taiwan Valiant touch screen with high precision, high reliability, intuitive display image, friendly interface, easy to use, easy to expand functionality and other salient features; not only can run WINCE, LINUX and other embedded operating systems and software, but also can run WINDOWS. software, can also run WINDOWS 98 and other PC operating systems and software, rich and flexible applications. The display screen adopts 15-inch TFT true color LCD screen, with touch screen operation, the display screen is intuitive and clear, easy to operate. It adopts CF electronic disk, which solves the problem of ordinary hard disk's intolerance to vibration, and can be applied to industrial site. It has one RS232 communication interface, one RS485 communication interface, one parallel print port, one USB interface, one PS/2 mouse interface, one keyboard interface, one RJ45 Ethernet port. The operating system adopts WIN CE as the operating system, WIN CE operating system has the characteristics of high stability, simple operation, less consumption of system resources, etc. It is widely used in industrial control embedded system, which is convenient for users to configure. It is widely used in industrial control embedded system, which is convenient for users to organize. It is used with all series of Hongrun instruments*** to form the instrument bus system.
2) Configuration of Hongrun series instruments
NHR-M34 is used as switching input/output (I/O) interface in computer control system, which adopts RS485 communication interface to communicate with the computer and can provide inexpensive and highly reliable switching inputs and outputs for the computer; NHR-M34 adopts optoelectronic isolation technology, which can be modularized and combined, and NHR-M34 is used in the system. NHR-M34 frequency detection module is used in the system to collect and control the switching quantities of fans, chillers, air-conditioning fan switches and various kinds of indicators, etc. The output module can choose relay output and OC gate output; NHR-M34 only requires two settings of baud rate and communication address, and the installation method adopts the rail mounting method.
NHR-5300 series artificial intelligence temperature controller/regulator is a domestic advanced instrument, internal high-performance ASIC chip and modular hardware design, in the input and output signals are used in the digital calibration technology to eliminate the stability of the adjustable resistance of the error; through the application of automatic zeroing technology can be used for a long time without zero drift, the measurement of digital accuracy and stability; with a variety of inputs, output modules can choose relay output and OC gate output; NHR-M34 only need to set the baud and communication two settings; the installation method is rail mounted. Precise and stable measurement figures; with a variety of input and output specifications and alarm mode settings. The power supply can fluctuate in a wide range of 85-264VAC (50-60HZ), which can ensure the accuracy of measurement and stability of work in a strong interference environment. In this system, according to the system needs to be used for temperature detection and control of the three wards, chiller humidity detection and control, as well as three wards in the dimming of the control output, dimming output for the 4-20mA signal to control the output of the phase-shifted thyristor, so as to achieve the effect of dimming.
NHR-7330 series valve position feedback controller has manual self-tuning function, manual/automatic non-disturbance switching operation function, and large-screen Chinese display to record the output status and display the output value, etc., as well as being used as a servo amplifier to directly control the proportional output of the valve position. In this system, NHR-7330 instrument is used for temperature detection of air-conditioning unit and forward and reverse control of servo motor.
3) Software Configuration
Main Functions: Temperature, humidity real-time display; in the case of automatic control, the user can set the temperature and humidity of the given value; in the touch screen user can do the following operations: temperature and humidity control mode switching; air conditioning unit fan conversion; chiller, exhaust fan, fan start and stop; dimming brightness control; ward indicator light switch. The working status of each equipment can be observed.
4) Product Pictures:
NHR-5300 Series Artificial Intelligence Temperature Controller/Regulator
NHR-7330 Valve Position Feedback Controller
NHR-M34 Frequency Switching Input and Output Module
Fifth, Conclusion
Adopting the NHR Series Instrumentation and the Taiwan Valentine's Touch Screen PC to form the The monitoring system of blood ward of a hospital in Shanghai has been running for one year without any trouble, and the operation condition is good. The system configuration of using NHR series products is simple and convenient; the function is reliable and stable.