#
Performance Analysis of Single Glazed Solar PVT Air Collector in the Climatic Condition of NE India^{ †}

^{1}

^{2}

^{*}

^{†}

## Abstract

**:**

## 1. Introduction

## 2. Methodology

- ⮚
- Heat transfer process is one dimensional.
- ⮚
- The heat capacity of PVT collector system is negligible.
- ⮚
- The system is in quasi-steady state.
- ⮚
- The ohmic and recombination losses in the solar cell are negligible.

#### 2.1. Energy Analysis

#### 2.2. Exergy Analysis

## 3. Model Analysis

#### 3.1. Physical Model of PVT System

^{2}. Area of the air duct is considered to be 0.54 m × 1.12 m and an air gap of 0.005 m is assumed between the tedlar and absorber plate. Various layer of the PVT system as shown in Figure 1 are, single glass cover (glazing), module of mono-crystalline silicon solar cell, tedlar, absorber plate, insulation. Details of the thermal and optical properties of the PVT system are depicted in Table 1 [24,25,26].

#### 3.2. Location of the Study

^{2}and 33.4 °C, respectively. Further, considered air properties for the evaluation of the performance is tabulated in Table 2.

## 4. Analysis

^{2}, PV panel are made of monocrystalline silicon solar cell, and air is forced to pass through the absorber plate and the tedlar. The values of the PV cell temperature $\left({T}_{c}\right)$, the back surface temperature of PV module $\left({T}_{bs}\right)$, the outlet fluid temperature of the collector $\left({T}_{fo}\right)$, the useful thermal heat gain $\left({Q}_{u}\right)$, the temperature dependent electrical efficiency $\left(\eta \right)$, and the exergy efficiency $\left({\eta}_{ex}\right)$ of the hybrid PVT air collector are obtained by inserting the climatic data and design data in Equations (1)–(13). Detail steps of the process are as follows:

- (i)
- (ii)
- The PV cell temperature $\left({T}_{c}\right)$ is obtained by inserting the climatic data and the back surface temperature of PV cell in Equation (1).
- (iii)
- The magnitude of the useful heat gain $\left({Q}_{u}\right)$ is obtained by inserting the inlet fluid temperature $\left({T}_{fi}\right)$ and the climatic data in Equation (4).
- (iv)
- The temperature dependent electrical efficiency $\left({\eta}_{o}\right)$ is obtained by using the climatic data and the conversion efficiency of the PV cell ($\eta $) in Equation (5).
- (v)
- The instantaneous thermal efficiency $\left({\eta}_{i}\right)$ is obtained by using the useful heat gain $\left({Q}_{u}\right)$, the design data and the climatic data in Equation (7).
- (vi)
- The exergy inlet $\left(E{x}_{in}\right)$ is obtained by using the climatic data in Equation (11).
- (vii)
- The exergy outlet $\left(E{x}_{out}\right)$ is obtained by using the climatic data and the overall useful heat gain $\left({Q}_{u}\right)$ and electrical exergy $\left(E{x}_{electric}\right)$ in Equation (12).
- (viii)
- Finally the exergy efficiency is obtained by using the exergy inlet $\left(E{x}_{in}\right)$ and exergy outlet $\left(E{x}_{out}\right)$ in Equation (13).

## 5. Results and Discussions

## 6. Conclusions

## Acknowledgments

## Abbreviations

A | Area of module (m^{2}) |

w | Width of module (m) |

C_{f} | Specific heat of air (J/kg K) |

FR | Heat removal factor |

h_{p1} | Penalty factor due to tedlar of PV module |

h_{p2} | Penalty factor due to glass of PV module |

h_{T} | Convective heat transfer coefficient from the tedlar back surface to the working fluid, i.e., air (W/m^{2}K) |

L | Length of module (m) |

L_{T} | Thermodynamic loss (kW·h) |

m_{f} | Air mass flow rate (kg/s) |

Q_{u} | Useful heat (W) |

T | Temperature (K) |

U | Overall heat transfer coefficient (W/m^{2} K) |

U_{I} | Estimation of internal uncertainty |

U_{T} | Convective heat transfer coefficient through the tedlar (W/m^{2}K) |

U_{b} | Overall heat transfer coefficient from flowing fluid to ambient (W/m^{2} K) |

U_{tc,a} | Overall heat transfer coefficient between solar cell to ambient through glass cover (W/m^{2} K) |

Greek letters | |

$\alpha $ | Absorptivity |

${\left(\alpha \tau \right)}_{eff}$ | Product of effective absorptivity and transmittivity |

$\beta $ | Packing factor |

${\beta}_{0}$ | Temperature coefficient of efficiency (1/K) |

$\tau $ | Transmittivity |

${\eta}_{0}$ | Efficiency of solar cell at standard test condition (%) |

$\eta $ | Temperature dependent efficiency (%) |

$\rho $ | Density (kg/m^{3}) |

Subscripts | |

a | Ambient |

bs | Base |

c | Solar cell |

eff | Effective |

f | Fluid (air) |

fi | Inlet fluid |

fo | Outgoing fluid |

g | Glass |

s | Sun |

T | Tedlar |

tc | Tedlar to cell |

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**Figure 5.**Variation of PV cell conversion efficiency of PVT system with time during the day, 15 May 2017.

Parameters | Value | Parameters | Value |
---|---|---|---|

${A}_{c}$ (m^{2}) | 0.61 | ${h}_{p1}$ | 0.375 |

w (m) | 0.54 | ${h}_{p2}$ | 0.965 |

${C}_{f}$ (J/kgK) | 1012 | ${U}_{T}$ (W/mK) | 66 |

${T}_{0}$ (°C) | 25 | ${U}_{t}$ (W/mK) | 11.4 |

${\alpha}_{c}$ | 0.9 | ${U}_{tT}$ (W/mK) | 9.72 |

${\beta}_{o}$ | 0.0045 | ${U}_{L}$ (W/mK) | 5.62 |

$\beta $ | 1 | ${U}_{tc,a}$ (W/mK) | 11.4 |

${\eta}_{o}$ | 0.15 | ${\tau}_{c}$ | 0.95 |

${\tau}_{g}$ | 0.95 | ${\tau}_{g}$ | 0.95 |

${m}_{f}$ (kg/s) | 0.0108 | ${\alpha}_{T}$ | 0.5 |

${K}_{g}$ (W/mK) | 1.1 | F_{R} | 0.90 |

${L}_{g}$ (m) | 0.003 | ${h}_{T}$ (W/mK) | 10.3 |

${U}_{tcf}$ (W/mK) | 4.03 | L (m) | 1.12 |

${U}_{fa}$ (W/mK) | 2.94 | ${U}_{L}$ (W/mK) | 9.83 |

Parameters | Value |
---|---|

${T}_{0}$ (°C) | 25 |

${h}_{T}$ (W/m·K) | 10.3 |

T_{s} (K) | 5778 |

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**MDPI and ACS Style**

Das, B.; Rezaie, B.; Jha, P.; Gupta, R. Performance Analysis of Single Glazed Solar PVT Air Collector in the Climatic Condition of NE India. *Proceedings* **2018**, *2*, 171.
https://doi.org/10.3390/ecea-4-05021

**AMA Style**

Das B, Rezaie B, Jha P, Gupta R. Performance Analysis of Single Glazed Solar PVT Air Collector in the Climatic Condition of NE India. *Proceedings*. 2018; 2(4):171.
https://doi.org/10.3390/ecea-4-05021

**Chicago/Turabian Style**

Das, Biplab, Behnaz Rezaie, Prabhakar Jha, and Rajat Gupta. 2018. "Performance Analysis of Single Glazed Solar PVT Air Collector in the Climatic Condition of NE India" *Proceedings* 2, no. 4: 171.
https://doi.org/10.3390/ecea-4-05021