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Research Papers

A Comparative Investigation of Two Types of MHPA Flat-Plate Solar Air Collector Based on Exergy Analysis

[+] Author and Article Information
T. T. Zhu, C. Ma, T. Y. Wang, J. Liu

Beijing Key Laboratory of Green Built
Environment and Efficient Technology,
Beijing University of Technology,
Beijing 100124, China

Y. H. Diao

Beijing Key Laboratory of Green Built
Environment and Efficient Technology,
Beijing University of Technology,
Beijing 100124, China;
Beijing Advanced Innovation Center
for Future Internet Technology,
No. 100 Pingleyuan,
Chaoyang District,
Beijing 100124, China

Y. H. Zhao

Beijing Key Laboratory of Green Built
Environment and Efficient Technology,
Beijing University of Technology,
Beijing 100124, China;
Beijing Advanced Innovation Center
for Future Internet Technology,
No. 100 Pingleyuan,
Chaoyang District,
Beijing 100124, China
e-mail: yhzhao29@126.com

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received May 15, 2017; final manuscript received June 20, 2017; published online August 22, 2017. Assoc. Editor: M. Keith Sharp.

J. Sol. Energy Eng 139(5), 051011 (Aug 22, 2017) (11 pages) Paper No: SOL-17-1185; doi: 10.1115/1.4037385 History: Received May 15, 2017; Revised June 20, 2017

In this study, a comparative investigation of two types of microheat pipe array (MHPA) flat-plate solar air collectors (FPSAC) based on exergy analysis has been conducted. The thermal performance of MHPA-type solar air collectors (SACs) with two different shaped fins is experimentally evaluated. A detailed parametric study is also conducted to examine the effects of various fins, operation parameters, and inlet air temperature at different mass flow rates on thermal and exergy efficiencies. Results indicated that using V-shaped slotted fins at the specified range of mass flow rates can enhance exergy efficiency. Exergy efficiency can be considered as the main criterion to evaluate the performance of MHPA FPSACs. Attaching V-shaped slotted fins on the condenser section of MHPA is more effective than attaching rectangular fins at high mass flow rates. By contrast, the latter is more effective than the former at low mass flow rates.

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Figures

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Fig. 1

Beijing climatic data diagram: Monthly solar radiation variation

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Fig. 2

Beijing climatic data diagram: Monthly wind speed variation

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Fig. 3

A cross-sectional view of type I SAC

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Fig. 4

A cross-sectional view of type II SAC

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Fig. 5

The operation process of MHPA FPSAC

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Fig. 6

Experimental setup of types I and II SACs

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Fig. 7

Variations in meteorological parameters versus time (December 15, 2015)

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Fig. 8

Inlet and outlet temperature variations of types I and II MHPA SACs (0.08 kg/s)

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Fig. 9

Thermal efficiency variations of types I and II MHPA SAC (0.08 kg/s)

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Fig. 10

Exergy efficiency variations of types I and II MHPA SAC (0.08 kg/s)

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Fig. 11

Thermal efficiency variations of types I and II MHPA SAC (0.053 kg/s)

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Fig. 12

Exergy efficiency variations of types I and II MHPA SAC (0.053 kg/s)

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Fig. 13

Thermal efficiency variations of types I and II MHPA SAC (0.027 kg/s)

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Fig. 14

Exergy efficiency variations of types I and II MHPA SAC (0.027 kg/s)

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Fig. 15

Thermal efficiencies versus Reynolds number for studied SACs

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Fig. 16

Exergy efficiencies versus Reynolds number for studied SACs

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Fig. 17

Variations in panel core temperature distribution (December 15, 2015): temperature distribution at 09:10 (a), 10:00 (b), 11:00 (c), and 12:00 (d)

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Fig. 18

Variations in the time constant versus time of two types of MHPA SAC

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Fig. 19

The corresponding relationship between mass flow rate and pressure drop

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