Kashif Irshad

Performance Analysis of Photo Voltaic Trombe Wall for Tropical Climate

The present study examines the performance of a single zone building integrated with PV Trombe wall (PV-TW) in term of thermal load reduction and electrical energy production by varying PV Glazing types (i.e. Single Glazing, Double glazing, Double glazing filled with gas (Argon)). TRNSYS software is used for simulation in which inputs like climatic conditions, building construction details, thermal properties of materials, detail of PV-TW and orientation of building is inserted. By comparing the results of all three types of glazing it is found that PV Double glazing filled with argon shows significant reduction in mean air duct temperature, hence reduces the PV cell temperature and increases power production of PV panel. Also solar radiation captured by massive wall of PV-TW is reduced by using PV Double glazing filled with argon as compared to other types of glazing, which further reduces thermal load inside the building.

Photovoltaic-Assisted Thermoelectric Cooling and Heating Systems

At present, maintaining thermal comfort inside the buildings is becoming expensive and environmental unfriendly for a great majority of countries, as the mechanism of cooling air can prompt the tremendous utilization of energy and CO2 emissions. This chapter introduces the renewable concept of photovoltaic (PV) and thermoelectric module (TEM) implemented on the building for thermal load reduction. The chapter starts by describing the basics of the PV technology and its dependent parameters, which enhances its performance. In addition, TEMs as an alternative to conventional space conditioning technology are presented. Since PV panel can power the TEMs directly and cause no harm to the environment, therefore, the numerical modeling of PV-assisted TEMs for development of energy-efficient buildings is presented. After that, different kinds of literature focusing on the application of integration of two materials, i.e., TEM and PV for thermal load reduction of buildings, are provided. Results suggested that implementation of PV-assisted TEM system reduces 5–10 °C inlet temperature with COP ranges from 0.4 to 2.5. Lastly, the challenges and future commendation of PV-assisted TEMs technologies are discussed. Thus, it was suggested that PV-assisted TEM system provides Freon free, less energy consuming, and less CO2 emission solution to the space conditioning problem of the building as compared to traditional air-condition system.

Structural and optical properties of chromium doped zinc oxide nanoparticles synthesized by sol-gel method

Nanosized Cr-doped ZnO nano particles were synthesized by facile sol-gel auto combustion method. The structural and optical properties of Cr-doped ZnO nanoparticles have been investigated by XRD and UV-Vis spectroscopy at room temperature for 0% to 8% concentration. X-ray diffraction analysis reveals that the Cr-doped ZnO crystallizes in a single phase polycrystalline nature with wurtzite lattice. With every % of doping, the peaks are shifting scarcely and doping of Cr is possible up to 7%. After that, the last peak vanishes, that signifies its structure is transmuted from 8% doping. The average crystallite size decreases with increase in Cr concentration (i.e. 28.9 nm for 0% to 25.8 nm for 8%). The UV-Vis spectra of the nanoparticles betoken an incrementation in the band gap energy from 3.401, 3.415, 3.431, 3.437,3.453, 3.514,3.521, 3.530 and 3.538 eV respectively, for 0,1, 2, 3, 4, 5, 6, 7 and 8 % doping concentration.