Abstract
Photovoltaic driven thermoelectric cooling devices are investigated for installation in a modular outdoor test-room. Because of Peltier effect in a thermoelectric cooling (TEC), heating and cooling is achieved by applying a voltage difference across the thermoelectric module. Theoretical design modeling of cooling load and noise characterization of building integrated Thermoelectric (TEC) Devices is analyzed. System design of photovoltaic driven TEC devices is investigated with varying fresh outdoor ventilation rates. Building integrated design of TEC devices inside ceiling suspended duct along with TEC devices mounted on wall driven by rooftop and active façade photovoltaic devices is considered in the analysis. In this way, two-stage dehumidification is achieved by two different sets of TEC devices. The investigation is conducted for effect of voltage, air flow rate and height of fin heat transfer surface. Expressions along with results for noise characterization in photovoltaic driven building integrated TEC devices are also provided.
Highlights
Thermoelectric module is a solid-state energy conversion device made up of thermocouples, which are wired in series electrical circuit and parallel thermal junctions
A thermocouple consists of N-type and P-type semiconductor elements, to generate thermoelectric cooling when a voltage difference in appropriate direction is applied through the connected circuit
Thermoelectric cooling (TEC) system design: It depends on cooling system thermal design, heat sinks’ geometry, heat transfer area, heat transfer coefficients of hot and cold side heat sinks, thermal and electrical contact resistances, fins placement and design, heat sinks integrated with thermosyphon, heat transfer fluids, phase change materials [7]
Summary
Thermoelectric module is a solid-state energy conversion device made up of thermocouples, which are wired in series electrical circuit and parallel thermal junctions. A thermocouple consists of N-type and P-type semiconductor elements, to generate thermoelectric cooling (viz., Peltier – Seebeck effect) when a voltage difference in appropriate direction is applied through the connected circuit. The temperature of the cold junction gradually decreases with heat transfer mechanism from environment to cold junction at a lower temperature This heat transfer mechanism takes place with passing of transport electrons from a low energy level inside the Ptype thermocouple element to a high energy level inside the N-type thermocouple element through the cold junction. Transport electrons transmit absorbed heat to hot junction at a higher temperature. This extra generated heat is dissipated to heat sink, whereas transport electrons return to a lower energy level in the P-type semiconductor element, viz., the Peltier effect takes place (see Figure 1). The prototype consists of an integrated design with ceiling suspended, wall mounted, rooftop and active façade TEC-PV devices [1]
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