Papers by Keyword: Thermoelectric Cooler

Abstract: Thermoelectric coolers need electrical energy to create temperature differences between the hot and cold sides; however, photovoltaic systems immediately convert solar radiation into electrical energy. The study is a combined (PV-TEC)—experimental study on a thermoelectric cooler operating by the Peltier effect to analyze and develop the TEC. One TEC was used, and its dimensions were (40*40*3.4) mm. The current required by the TEC is 6A and 12V DC. The thermoelectric cooler is electrically powered by a solar system consisting of two 660W solar panels, a solar charger and two 12V batteries. The results revealed a relationship between the coefficient of performance and the input energy, as the COP showed an increase as the input energy decreased, which is an essential factor for the cooling process. The temperature difference, which was the difference between ambient and cold temperatures, is related to the COP. The COP rises as the temperature difference decreases until it becomes stable. Moreover, the consumption current is an important factor in electronic devices, so the study focused on demonstrating the effect of the cold side temperature on the current, and an empirical equation was found between them. It has been found that a decrease in the temperature of the cold side leads to a sharp reduction in the consumption current until it stabilizes. The maximum coefficient of performance was 3.7436, obtained at the current 1.4 and cold side temperature of zero degrees centigrade. This high value of the coefficient of performance resulted from using curved fins to improve heat dissipation from the hot side.

Abstract: This article includes a car-use thermoelectric cooler and a generator driven by exhaust heat. Due to space constraints, automotive air conditioning systems are driver-oriented. The researcher invented a thermoelectric air conditioner that cools the back seat roof. The cooler is quiet and easy to assemble. The cooler was powered by an exhaust-pipe-mounted thermoelectric generator. The thermoelectric generator and cooler were incorporated into a storage device to provide continuous power to the cooler. A DC-DC Converter lets us store exhaust pipe heat energy and use it to cut household energy demand. This saves electricity and is eco-friendly. This study will design a thermoelectric system to improve automotive systems and reduce the environmental impact of vehicle waste heat, which can contribute to global warming.

Abstract: Thermoelectric Cooler (TEC), with typical advantages such as low acoustic noise, small volume, lightness, high performance and high reliability, is a compact device widely used in fields like military applications and cooling or heating small spaces. Circuit design of a real-time controlled, LED displayed and monitored cooling and heating system is presented in this paper. The system is consisted of STC89C52RC MCU, TEC1-12706, temperature monitoring chip DS18B20, LED temperature display unit etc. Five kinds of functions like heating or cooling automatically adjustable, temperature controlling, temperature real-time displaying and monitoring and limitation value settings are achieved. A high cooling/heating efficiency has been obtained. The test result shows that the temperature rise/decrease can be 6,83°C/2.18°C per minute in the early 5 operation process of this system.

Abstract: Thermoelectric Cooler (TEC) is a semiconductor based device that has ability to separate cold and hot temperatures once the rated voltage is applied. In this study, TECs are used as Thermoelectric Generator (TEG). For this aim an experimental setup is built. By the help of this experimental setup electricity generation performances of the TEC is tested under various temperature conditions. The setup includes two water tanks, loads, TEC modules, computer interface and a data acquisition system. Temperature difference required for electrical generation of the TEC module is provided by filling the tanks with water at different temperatures. A data acquisition system is designed for this specific setup. First the setup with data acquisition system is introduced then experimental results are presented and discussed. Keywords:Electrical energy generation, Thermoelectric Cooler, LabVIEW

Abstract: In this paper, we study the temperature control system of thermoelectric cooler controlled by MSP430F149 microcomputer. The system achieves automatic temperature control by using PID algorithm and voltage-controlled steady flow circuit. Using the keyboard and LCD, we can set the temperature, display the working status and draw real-time temperature curve.

Abstract: This paper presents a method small TEC temperature control system that is based on photovoltaic power generation technology. And their working principles are analyzed, and equivalent circuit diagrams are given at different working mode, at last simulation and experimental results are presented to verify the fact that the principle is correct.

Abstract: Thermoelectric coolers have been widely applied to provide cooling for refrigerators in addition to conventional absorption and vapor compression systems. To increase heat dissipation in the thermoelectric cooler’s modules, a heat pipe can be installed in the system. The aim of this study is to develop a thermoelectric heat pipe-based (THP) refrigerator, which consists of thermoelectric coolers that are connected by heat pipe modules to enhance heat transfer. A comparative analysis of the THP prototype and conventional refrigerator with vapor compression, absorption and thermoelectric systems is also presented. The prototype system has a faster cooling down time and a higher coefficient of performance than the absorption system but still lower than vapor compression system

Abstract: An experimental model for electronic chip cooling was designed to investigate the cooling performances of an air-cooled thermoelectric cooler (TEC). The effect on the cold side temperature was experimented on the variation of heat emission intensity of TEC hot side and operating current. It was found that the mean temperature of the TEC cold side will decrease with enhanced the fan power, and the cooling performance would be better. The cold side temperature of TEC appeared a low valley with operating current variation. Optimizing the heat emission and the operating current properly is necessary to make the TEC work at perfect cooling performance.

Abstract: A novel design of a temperature test chamber in multi-parameter combined environmental test was introduced, in which thermoelectric coolers were adopted to achieve both high and low temperature. Multiple distributed actuators and temperature sensors were used for improving the evenness of the temperature field. A well performed cooling system for waste heat dissipating was designed based on air-cooled radiator and circulating water flow. A temperature control system based on PC and MCU with wireless communication modules was designed. The thermoelectric cooler was driving by H-bridge circuit, whose power was controlled by PWM signal. PID algorithm was applied and average temperature was adopted to be the controlled variable. Measurement and control software on the PC and MCU was analyzed and its flow diagram was given. Influenced by centrifugal acceleration, unevenness of the temperature field would increase. A fan was mounted at the bottom of the chamber to improve the evenness of the temperature field. The experiment results show that the temperature environment with other combined environment is realized in the test chamber based on the above technology.

Abstract: Thermoelectric cooler has dynamic thermoelectric performance under complex environment. A linear dynamic model of the thermoelectric cooler is derived using small-signal linearization method. It shows that the dynamic model of the thermoelectric cooler has one zero and two poles. The dynamic model of the thermoelectric cooler is showed to vary with operating conditions. Based of average linear dynamic model of a thermoelectric cooler, a temperature control system is designed for the cold end temperature of the thermoelectric cooler using fuzzy-PID algorithm. The step response tests show that the controller has satisfying dynamic and static performance. In room temperature environment, the response time for cooling down 18°C is around 340s and the steady error is very small. The cold-end temperature can be maintained at the setting value within 0.1°C. Experiment results also show that the setting temperature can reach to 23°C below the environment temperature, and the setting value is smaller and the step response time is longer.