Design of Temperature and Humidity Control Systems for Microgravity

In industrial production, temperature and humidity are common main manipulated parameters, especially in heat treatment industry, the temperature control is becoming more and more important. This paper from two aspects that hardware and software introduced single-chip microcomputer (SCM) C8051F intelligent temperature and humidity control system, and described schematic diagram of hardware and software. The design adds the integration of carbon dioxide concentration and light intensity detection and necessary communication function. It is a more humanized and more practical intelligent temperature and humidity measurement and control system.

Oyster mushroom is one type of mushroom that is commonly consumed by Indonesian people which is relatively easy to cultivate. It can produce the optimum fruit body at temperatures below 30°C, the range of humidity is 60–90% with altitudes between 500–1000 meters above sea level. This paper describes on the development of the prototype of temperature and humidity control system in oyster mushroom cultivation using a fuzzy logic controller. The prototype comprises of DHT11 sensor for detecting temperature and humidity, Arduino microcontroller, mistmaker, and cooling fan. Fuzzy logic controller is installed in the Arduino microcontroller to generate an actuating signal for the mistmaker and cooling fan based on fuzzy inputs. The whole fuzzy system is designed using two inputs namely temperature and humidity with each input consist of three fuzzy sets with the triangular membership function. Meanwhile, the output variable is the speed of cooling fan with three fuzzy sets and triangular membership functions. A Mamdani inference system is adopted to achieve the control objective in the whole system. Based on the appropriate rule bases, fuzzy logic controllers are designed to produce the temperature and humidity setpoint around 27°C and 60–90 % respectively. Experimental results show the time response to achieve the setpoint span from 1 minute 27 seconds until 8 minutes 10 seconds.

The design and verification of accurate temperature control system of the oven with the small or middle scale programmable logic controller (PLC) base on the dahlin algorithm is introduced. The design can achieve accurate control to the pure lag system and regulate the other logic control form the same controller. The system is cost-effective on the specific modular or instrument for the complex computing in some automatic device. Meanwhile, the design is computed and simulated by the matlab softwear for verifying the implementation. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3101

Addressing the challenge of ensuring a comfortable indoor environment in both commercial and residential buildings through the use of heating, ventilation, and air conditioning (HVAC) systems is a critical issue. This challenge is intricately connected to the development of sophisticated multi-channel controllers to regulate temperature and humidity effectively. This academic discussion initially focuses on the development and examination of a complex, interactive, nonlinear mathematical model that encapsulates the ideal parameters for temperature and humidity to achieve the desired comfort levels. The paper then progresses to explore various methodologies in the design of temperature and humidity control systems. It delves into the traditional Proportional-Integral-Derivative (PID) controllers, a mainstay in the industry, and extends to more advanced iterations. These include the integration of PID controllers with distinct decoupled controllers and the innovative combination of PID controllers with self-adjusting parameters, which are informed by the principles of fuzzy logic. This combination is particularly significant for the processes of heating and humidification. Subsequently, the paper presents the results obtained from simulations conducted on a proposed fuzzy-PID controller using Matlab, a widely used computational tool. These simulations are crucial in evaluating the efficacy of the controller design. Additionally, the paper offers an analysis of experimental data collected over a six-month period. This data is instrumental in assessing the real-world performance of the proposed system, providing valuable insights into its practical applicability and effectiveness in managing indoor climate conditions. In summary, this comprehensive study not only lays the groundwork for an interactive model for climate control but also compares various controller designs, culminating in the proposal and evaluation of an advanced fuzzy-PID controller. This work stands as a significant contribution to the ongoing efforts to enhance indoor climate control in buildings.

Chapter 9 - Case Study: Temperature control project

In this article, the new method for designing the temperature control system with low vibration for a scanning tunneling microscope using dual modes heat exchanging process is proposed. The system is designed to operate into two modes i.e. the temperature control mode and the temperature stabilization mode. In the temperature control mode, the cold water is used as a heat convector in heat exchanging process. To reduce the vibration introduced by flowing of water in heat exchanging process, the cold vapor is used as a low density heat convector in the temperature stabilization mode. To assess the feasibility of the new proposed method, the preliminary experimental system is setup and verified. The experimental result of temperature control with step changed of the set-point temperature shows that temperature inside the cylindrical closed surface capsule reached the set-point value with the rise time of 25 min. The experimental result also shows that temperature stability with the fluctuation level of 0.05 °C and 0.01 °C over periods of 15 min and 2 min, respectively, are achieved. The results indicate that our goal to construct the temperature control system for a scanning tunneling microscope with temperature fluctuation of 0.01 °C over a period of 1 hour and low vibration can be realized by using the proposed method.

In the RNA virus laboratory, to realize the characteristics of small temperature fluctuation and high precision in the process of RNA virus detection, a high-precision temperature control system based on a fuzzy PID temperature control algorithm is designed. The system takes MSP430 as the main controller and controls the temperature through the NTC acquisition circuit and TEC-driven circuit. The system first adopts the incremental PID algorithm for preliminary design, second determines the incremental PID parameters, and then obscures the algorithm on this basis to make it an adaptive fuzzy PID algorithm, which further improves the stability and response speed of the system. Finally, through the physical test, the incremental PID algorithm is compared with the adaptive fuzzy PID algorithm, and the design of a fuzzy PID temperature control system for RNA virus detection is realized. The test results show that the system error of the improved fuzzy PID is less than $0.2^{\circ}\mathrm{C}$, the working time is shortened by nearly 70 seconds, and has the characteristics of high precision, fast response speed, and small temperature fluctuation. Through the PID temperature control system for RNA virus detection designed, by comparison, the system has high precision and low-temperature fluctuation and can be well used in RNA virus laboratories.

With the development of science and technology in China, temperature control system has been widely used in many fields. The emergence of PLC effectively improves the shortcomings of PID control system, optimizes the performance of PID control system, and plays a very important role in promoting industrial production and construction. In view of the design of temperature control system of heating furnace, configuration software and PLC can be used the combination of technology can achieve the goal of furnace temperature control, and it can also monitor the furnace temperature in real time and comprehensively, and then adjust the furnace temperature according to the application requirements. The investment in the process is less, which can reduce the cost to a certain extent, and also has the application advantage of high accuracy. The temperature control system of electric heating furnace is designed in this paper. PLC is mainly used, and the temperature system is controlled intelligently with touch screen. According to the actual situation and cost budget, the controller of this paper chooses Mitsubishi FX2N- 48MR series PLC. In order to achieve intelligent control, it needs to use digital PID control algorithm, which is convenient for the staff to operate Gt1040-qbbd-c series touch screen is used to realize human-computer interaction. The system can be started and stopped. The touch screen for temperature setting can be very simple to operate. The temperature change can also be visually displayed and monitored, and the whole system can be automatically set.

In order to ensure the measurement accuracy and long-term working stability of the laser methane sensor in the field environment such as coal mines, a design method of a high-precision double-closed-loop laser temperature control system based on the laser absorption peak and working temperature is proposed to improve the temperature control system of the DFB laser. control accuracy. Based on ADN8834 integrated TEC controller chip, the temperature control system based on PI compensation network is designed, and the simulation analysis of the temperature control system is carried out. In order to verify the accuracy and long-term working stability of the temperature control system, the laser methane sensor has passed the (-20~60)℃ high and low temperature experiment. The application of methane sensors in industrial sites such as coal mines provides technical support.

To solve the problem in which the output power and wavelength of semiconductor lasers in fiber optic sensing systems are easily affected by the drive current and temperature, a high-precision current drive and temperature control system was developed in this study. The embedded system was used to provide a stable drive current for the semiconductor laser through closed-loop negative feedback control; moreover, some measures, such as linear slow-start, current-limiting protection, and electrostatic protection, were adopted to ensure the stability and safety of the laser’s operation. A mathematical model of the temperature control system was constructed using mechanism analysis, and model identification was completed using the M sequence and differential evolution (DE) algorithms. Finally, the control rules of the fuzzy proportional integral differentiation (PID) algorithm were optimized through system simulation to make it more suitable for the temperature control system designed in this research, and the accurate control of the working temperature of the semiconductor laser was realized. Experimental results showed that the system could achieve a linearly adjustable drive current in the range of 0–100 mA, with an output current accuracy of 0.01 mA and a temperature control accuracy of up to 0.005 °C.

The Large High Altitude Air Shower Observatory (LHAASO) is located in Haizi Mountain, Daocheng County, Sichuan Province, with an average altitude of 4410 m. The Wide Field of view Cherenkov Telescope Array (WFCTA) is one of its three observation arrays. Laser calibration system for WFCTA consists of 2 nitrogen lasers and 1 Nd:YAG laser system. During the operation of WFCTA, the outdoor temperature may dropped from 17 °C to about -30 °C, which will bring serious challenges to the operation of laser calibration system operating in the field. In order to ensure the stable working environment and remote operation of the laser, we have developed the LHAASO-WFCTA laser temperature control, remote control and data monitoring system. The fluctuation of temperature in the box is within 1 °C around the target. The laser temperature control system was officially put into operation in Sept. 2020. In this paper, the design scheme, fabrication scheme, comparison of heat dissipation coefficient and test of temperature control system are introduced. The working data shows that both nitrogen molecule lasers and Nd:YAG laser temperature control system can achieve stable and long-term operation in high-altitude extreme field.

The performance parameters and long-term operation stability of the photodetector in radiation temperature measurement will change with the change of working temperature. In order to meet the high precision temperature control demand of the photodetector, a temperature control system based on the thermoelectric refrigeration control chip ADN8831 is designed. The control system uses the thermistor as the temperature sensing element, and uses the analog proportional integral differential (PID) circuit to control the temperature closed-loop. The experimental results show that the Thermoelectric cooler (TEC) inside the photodetector can stabilize at the set temperature within 11 s under the drive of the temperature control system, and the temperature control accuracy is as low as ± 0.01 °C.

hatching systems requiring high control accuracy of temperature and humidity. Particularly temperature, small temperature change will significantly affect hatching time and hatching rate, and temperature and humidity is the controlled amount of interaction between two. Due to the coupling characteristics of temperature and humidity is difficult to establish a precise mathematical model, caused uncertainty in its control. Fuzzy control method witch proposed in this article will not only improve control precision, and to improve the robustness of control algorithms and adaptive capacity.

Design of Temperature Control System with Preview Action for Coke Oven Plant

It is introduced in this paper that a system of multi-point temperature measurement and control has been designed in advanced technology of computer and industrial control area for thermal discharge model test. Digital temperature sensors in “1-wire bus”, digital circuit modules, standardized products XFC components and functional circuit module are applied in hardware of the system. Object-oriented approach is adopted in software designing and programming. C++6.0 and AutoCAD are used in measurement procedures and data processing for easily operation and real time measurement. From a number of applications on model test study for water environment near power plants in the Yangtze River, it is shown that the measurement is satisfactorily precise and reliable, meeting the requirements of design and test. The practical system in advanced technology and related equipment can be used in any place where water temperature monitoring is possible and necessary, such as rivers, lakes, reservoirs, canals or swamp water environments.