Theoretical investigation on thermal performance of heat pipe flat plate solar collector with cross flow heat exchanger

2012 ◽  
Vol 48 (7) ◽  
pp. 1167-1176 ◽  
Author(s):  
Lan Xiao ◽  
Shuang-Ying Wu ◽  
Qiao-Ling Zhang ◽  
You-Rong Li
Keyword(s):  
Heat Exchanger ◽  
Flat Plate ◽  
Heat Pipe ◽  
Theoretical Investigation ◽  
Thermal Performance ◽  
Solar Collector ◽  
Cross Flow ◽  
Flow Heat ◽  
Flat Plate Solar Collector

Serpentine Flat Plate Collector Thermal Performance Testing

2011 ◽  
Vol 261-263 ◽  
pp. 648-651 ◽  
Author(s):  
Qian Yu Tang ◽  
Hua Wang ◽  
Hui Tao Wang ◽  
Shan Qing
Keyword(s):  
Flat Plate ◽  
Heat Pipe ◽  
Thermal Performance ◽  
Solar Collector ◽  
Performance Testing ◽  
Test Results ◽  
Environmental Benefit ◽  
Flat Plate Solar Collector ◽  
Flat Plate Collector

Due to the conventional flat plate solar collector has low efficient, it is necessary to make some improvements in the structure of conventional flat solar collector. This research improved the structure of conventional flat solar collector and conducted thermal performance testing for the improved structure which is serpentine heat pipe flat plate solar collector. The test results indicate that serpentine heat pipe flat plate solar collector has higher efficient than conventional solar collector. Thus, serpentine has better economic and environmental benefit than conventional solar collector.

Numerical simulation investigation on thermal performance of heat pipe flat-plate solar collector

2017 ◽  
Vol 118 ◽  
pp. 113-126 ◽  
Author(s):  
Dongwei Zhang ◽  
Hanzhong Tao ◽  
Mimi Wang ◽  
Zishuai Sun ◽  
Chuan Jiang
Keyword(s):  
Numerical Simulation ◽  
Flat Plate ◽  
Heat Pipe ◽  
Thermal Performance ◽  
Solar Collector ◽  
Flat Plate Solar Collector

Optimization of a wickless heat pipe flat plate solar collector

1999 ◽  
Vol 40 (18) ◽  
pp. 1949-1961 ◽  
Author(s):  
H.M.S. Hussein ◽  
M.A. Mohamad ◽  
A.S. El-Asfouri
Keyword(s):  
Flat Plate ◽  
Heat Pipe ◽  
Solar Collector ◽  
Flat Plate Solar Collector

Design, Implementation, and Evaluation of Thermal Performance of a Thermosiphon Flat-Plate Solar Collector for Water Heating in Ecuadorian Coastal Region

2017 ◽  
Author(s):  
Carola Sánchez ◽  
José Macías ◽  
Jonathan León ◽  
Geancarlos Zamora ◽  
Guillermo Soriano
Keyword(s):  
Flat Plate ◽  
Thermal Performance ◽  
Solar Collector ◽  
Storage Tank ◽  
Hot Water ◽  
Attractive Alternative ◽  
Local Market ◽  
Water Heating ◽  
Water Storage Tank ◽  
Flat Plate Solar Collector

Passive solar water heating (SWH) is a convenient method to meet domestic hot water requirements in rural areas, where electricity may not be available or fuel supply might be limited due to difficult access. In this work, a low-cost thermosiphon flat-plate solar collector alternative is presented. The design was purposely limited to materials and recyclable products widely available in the local market, such as Tetra Pak, plastic bottles, and polypropylene (PP) fittings and pipes. Since PP is a thermoplastic polymer, a poor heat conductor, it was necessary to ensure a suitable system isolation to obtain an optimum thermal performance, comparable to commercial solar collectors. The design was built and tested in Guayaquil, Ecuadorian coastal city. Six inexpensive temperature sensors were placed at the entrance and exit of the collector, on the flat-plate and inside the hot water storage tank. Data was recorded using an Arduino single-board computer and later analyzed with the data gathered via weather station. The implementation costs of the system are approximately US$300, the overall performance during January 2017 fluctuated between 54% and 23%, and the storage tank temperature range varied from to 46°C to 33°C. Due to its reliability and affordable cost, the SWH system is an attractive alternative to an Ecuadorian commercial solar flat plate collector, which price is set between US$600 and US$700, it has an efficiency around 60%, and the average annual storage tank temperature is 62°C.

Performance Analysis of Multi-Pass Cross-Flow Heat Exchangers

2018 ◽  
Author(s):  
Kiran Lankalapalli ◽  
Ahmed ElSawy ◽  
Stephen Idem
Keyword(s):  
Heat Exchanger ◽  
Performance Analysis ◽  
Thermal Performance ◽  
Heat Exchangers ◽  
Cross Flow ◽  
Threshold Value ◽  
Finned Tube ◽  
Flow Heat ◽  
Rate Ratios ◽  
Side Flow

A steady state sensible performance analysis of multi-pass cross-flow finned-tube heat exchangers is reported. The investigation considers various flow circuiting, such as counter cross-flow, parallel cross-flow, and cross-flow where the tube-side flow is in parallel. A previously developed matrix approach is used to evaluate the heat exchanger performance in each tube pass. The equations required to model the thermal performance of these configurations are presented, and the thermal performance is compared for each type of flow circuiting. Thereafter a parametric study on cross-flow heat exchanger performance is performed by varying physically significant parameters such as number of transfer units (NTU) and capacity rate ratios, and the graphical results for each type of flow circuiting are presented both for both two-pass and three-pass arrangements. A consistent criterion is proposed for each case, wherein increasing the NTU beyond a certain threshold value does not significantly improve heat exchanger thermal performance.

Using a Windbreak to Improve the Thermal Performance of a Flat Plate Solar Collector: A Feasibility Study

2011 ◽  
Author(s):  
Saeed Moaveni ◽  
Michael C. Watts
Keyword(s):  
Flat Plate ◽  
Heat Loss ◽  
Forced Convection ◽  
Thermal Performance ◽  
Solar Collector ◽  
Large Scale ◽  
Ambient Air ◽  
Absorber Plate ◽  
Wide Range ◽  
Flat Plate Solar Collector

During the past few decades, a wide range of studies have been performed to improve the performance of flat plate solar collectors by either reducing the heat loss from a collector or by increasing the amount of solar radiation absorbed by the absorber plate. Examples of these studies include adding transparent honeycomb to fill the air gap between the glazing and absorber plate to reduce convective heat loss, replacing the air in the gap by other gases such as Argon, Krypton, Xenon and Carbon Dioxide, or adding a chemical coating such as Copper Oxide to increase absorbtance and reduce the emittance of the absorber plate. While these methods improve the collector’s efficiency, they focus primarily on limiting the natural convection that occurs in the collector cavity, or on improving the optical properties of the absorber or glazing. None of these studies have addressed the problem of heat loss due to forced convection to the surrounding ambient air in any detail. Yet, research has shown that forced convection will contribute significantly to the heat loss from a collector. Windbreaks have traditionally been used to direct wind to protect farmland, and to direct wind drifts and sand dunes. Windbreaks also have been shown to provide protection for homes from winter winds which result in reduced heating costs for buildings. While windbreaks have been traditionally used for large scale applications, there is reason to believe that similar benefits can be expected for scaled down applications such as adding a windbreak along side of a flat-plate solar collector. In this paper, we examine the feasibility of using a windbreak to provide a flat plate solar collector protection from the wind in order to improve its performance. A series of experiments were performed wherein the thermal performance of two flat-plate collectors — one without a windbreaker and one with a windbreaker — were measured. The results of these experiments are reported in this paper and the need for further studies to explore different windbreak configurations is discussed.

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