Modeling and simulation of a photovoltaic thermal-compound thermoelectric ventilator system

et al. 2019

Energy and Buildings

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a b s t r a c tExhaust air heat recovery is of great significance for building energy conservation. Since passive heat recovery systems use temperature or enthalpy difference between outdoor air and indoor air to drive the system, the temperature of fresh air supply cannot meet indoor requirements and the exhaust heat is not fully recovered. In this study, a solar-driven exhaust air thermoelectric heat pump recovery (SDEATHP) system is tested and evaluated for its ability to recover thermal energy from exhaust air to cool or heat fresh air. An experimental platform was established to test its performance. Results show that the SDEATHP system can obtain higher fresh air supply temperature in winter and lower fresh air supply temperature in summer. The system requires only 3.12 W of power for the fans, and the average relative cooling coefficient in summer and the average relative heating coefficient can reach 50.6 and 57.9, respectively. The optimal operating current and voltage of TE modules and photovoltaic system is analyzed, and then the number and types of electrical connections for the TE modules in SDEATHP system are discussed. The SDEATHP system provides a new method for building energy recovery and fresh air supply.

Section: Introductionmentioning

confidence: 99%

Experimental study and performance analysis of solar-driven exhaust air thermoelectric heat pump recovery system

Liu

et al. 2019

Energy and Buildings

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“…Thermoelectric refrigeration technology has the advantages of a simple structure, no moving parts, fast refrigeration speed, and most notably no refrigerant required in the system, so no pollution to the environment 6,7 . It has been widely used in electronic equipment cooling, waste heat recovery and small refrigeration devices 8‐10 . In recent years, building energy conservation and indoor comfort has been received extensive attention 11,12 .…”

Section: Introductionmentioning

confidence: 99%

“…6,7 It has been widely used in electronic equipment cooling, waste heat recovery and small refrigeration devices. [8][9][10] In recent years, building energy conservation and indoor comfort has been received extensive attention. 11,12 Using renewable energy to control indoor environment and comfort in buildings can Abbreviations: T H , Hot source; T L , Cold source; T 1 , Temperature at the hot end of the two-stage thermoelectric refrigeration system (K); T 2 , Temperature at the cold end of the two-stage thermoelectric refrigeration system (K); T m , Temperature at the junction layer between the first and second layers (K); Q L , Cooling capacity (W); Q H , Heat capacity (W); k 1 , Heat transfer coefficient between the two-stage thermoelectric refrigeration system and the hot source (W/m 2 ÁK); F 1 , Heat transfer area between the two-stage thermoelectric refrigeration system and the hot source (m 2 ); k 2 , Heat transfer coefficient between the two-stage thermoelectric refrigeration system and the cold source (W/m 2 ÁK); F 2 , Heat transfer area between the two-stage thermoelectric refrigeration system and the cold source (m 2 ); P, External input power (W); α P , Seebeck coefficient of P-type semiconductor arms (V/W); α N , Seebeck coefficient of N-type semiconductor arms (V/W); I, Working current (A); R, Total resistance of the two dipole arms (Ω); K, Thermal conductivity of the two dipole arms (W/mÁK).…”

Section: Introductionmentioning

confidence: 99%

Global sensitivity analysis of two‐stage thermoelectric refrigeration system based on response variance

Wang

et al. 2020

Int J Energy Res

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Summary In this paper, a mathematical model of two‐stage thermoelectric refrigeration system is established considering the influence of external heat transfer and its performance is analysed based on finite‐time thermodynamics and Newton's heat transfer law. Taking the cooling capacity and coefficient of performance of the two‐stage thermoelectric refrigeration system as separate objective functions, the general relationship between cooling capacity, coefficient of performance, and working design parameters of the system is determined. The influence of the fluctuation of the input design parameters on the output performance parameters is studied using a global sensitivity analysis based on the variance response. The main and total Global sensitivity indices of input parameters that affect the output performance are calculated, and the related sensitivity ranking are obtained. The results can be used to guide the performance analysis and parameter optimization of two‐stage thermoelectric refrigeration system in application.

“…Thermoelectric cooling, a technology developed on the basis of thermoelectric materials, exists at the intersection of refrigeration technology and semiconductor technology . Compared with traditional compressor‐based refrigeration systems, thermoelectric refrigeration systems use solid‐state semiconductor refrigeration that requires neither a compressor nor refrigerant.…”

Section: Introductionmentioning

confidence: 99%

Global moment‐independent sensitivity analysis of single‐stage thermoelectric refrigeration system

Liu

et al. 2019

Int J Energy Res

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A mathematical model of single-stage thermoelectric refrigeration system (SSTRS) was built considering the influence of external heat transfer. Based on the relationship between the input system design variables and the output cooling capacity, the coefficient of performance and the influence of the fluctuation of the design variables on the stability of the thermoelectric refrigeration system output performance parameters were studied using a moment-independent sensitivity analysis. The Latin hypercube sampling method was used to simulate the fluctuation of the design variables, and their moment-independent sensitivity indices were calculated by the Monte Carlo method. The design variables were then sorted according to their importance to the output parameters, and the key design variables affecting the coefficient of performance and the cooling capacity were obtained. These results can provide useful guidance for the design and optimisation of SSTRS.