A Performance Prediction Methodology for Integral Collection-Storage Solar Domestic Hot Water Systems

1985 ◽  
Vol 107 (4) ◽  
pp. 265-272 ◽  
Author(s):  
A. Zollner ◽  
S. A. Klein ◽  
W. A. Beckman
Keyword(s):  
Performance Prediction ◽  
Prediction Method ◽  
Water Systems ◽  
Test Methods ◽  
Hot Water ◽  
Climatic Data ◽  
Domestic Hot Water ◽  
Long Term Performance ◽  
Term Performance ◽  
A Performance

A performance prediction methodology is developed which is applicable to most commercially available integral collection-storage passive solar domestic hot water systems. A computer model of a general ICS component was created to be compatible with the transient simulation program TRNSYS[3], and was used to develop and verify the simpler monthly performance prediction method. The method uses the system parameters from available test methods, monthly average climatic data, and load size to predict long term performance of ICS systems.

Polymers for Solar Domestic Hot Water: Long-Term Performance of PB and Nylon 6,6 Tubing in Hot Water

2004 ◽  
Vol 126 (1) ◽  
pp. 581-586 ◽  
Author(s):  
Chunhui Wu ◽  
Susan C. Mantell ◽  
Jane Davidson
Keyword(s):  
Creep Compliance ◽  
Hot Water ◽  
Master Curves ◽  
Burst Strength ◽  
Domestic Hot Water ◽  
Nylon 6,6 ◽  
Creep Modulus ◽  
Long Term Performance ◽  
Term Performance

Polymers offer a lightweight, low cost option for solar hot water system components. Key to the success of polymer heat exchanger components will be the long term mechanical performance of the polymer. This is particularly true for heat exchangers in which one of the fluids is pressurized hot water. For domestic hot water systems, polymer components must not fail after many years at a constant pressure (stress levels selected to correspond to 0.55 MPa in a tube) when immersed in 82°C potable water. In this paper, the long term performance of two potential heat exchanger materials, polybutylene and nylon 6,6, is presented. Two failure mechanisms are considered: failure caused by material rupture (as indicated by the hydrostatic burst strength) and failure caused by excessive deformation (as indicated by the creep modulus). Hydrostatic burst strength and creep modulus data are presented for each material. Master curves for the creep compliance as a function of time are derived from experimental data. These master curves provide a mechanism for predicting creep modulus as a function of time. A case study is presented in which tubing geometry is selected given the hydrostatic burst strength and creep compliance data. This approach can be used to evaluate properties of candidate polymers and to design polymer components for solar hot water applications.

Dynamic Solar Domestic Hot Water Testing

1990 ◽  
Vol 112 (2) ◽  
pp. 98-101 ◽  
Author(s):  
W. Spirkl
Keyword(s):  
Test Procedure ◽  
Dynamic Test ◽  
Hot Water ◽  
Domestic Hot Water ◽  
Water Testing ◽  
Naturally Occurring ◽  
Correlation Models ◽  
Long Term Performance ◽  
Term Performance

A dynamic test procedure for SDHW systems is presented, which generalizes correlation models to the nonstationary case. It is shown that testing can be performed with an accuracy comparable to stationary models. The dynamic procedure is more flexible in testing, since any load and radiation profiles are explicitly taken into account including the ones naturally occurring. The parameters are identified using filter and least squares technique. Long-term performance is predicted with the same model used for testing. The method is applied to experimental data of four different systems.

Prediction of Long-Term Properties of Fiberglass Pipe Based on the Shift Factors Method

2013 ◽  
Vol 748 ◽  
pp. 411-415 ◽  
Author(s):  
Jian Zhong Chen ◽  
Zhuo Li ◽  
Si Rong Zhu ◽  
Zhuo Qiu Li ◽  
Yue Lin Kong
Keyword(s):  
Composite Material ◽  
Performance Prediction ◽  
Viscoelastic Properties ◽  
Prediction Method ◽  
Polymer Matrix Composite ◽  
Design Life ◽  
Service Conditions ◽  
Long Term Performance ◽  
Term Performance

The design life of fiberglass pipe is 50 years. In order to ensure long service life of fiberglass pipe, long-term properties under service conditions is the most important performance. According to the polymer matrix composite material with viscoelastic properties, adopt equivalent principle and shift factors method combined with experiments to study the long term performance of fiberglass pipe, established a relatively simple for fiberglass pipes long-term performance prediction method. The experiments show that compliance of fiberglass pipe with all hoop winding increased by 148% after 50 years in 60% stress level.

A Design Method for Thermosyphon Solar Domestic Hot Water Systems

1987 ◽  
Vol 109 (2) ◽  
pp. 150-155 ◽  
Author(s):  
M. P. Malkin ◽  
S. A. Klein ◽  
J. A. Duffie ◽  
A. B. Copsey
Keyword(s):  
Flow Rate ◽  
Design Method ◽  
Water Systems ◽  
Hot Water ◽  
Average Flow Rate ◽  
Domestic Hot Water ◽  
Average Flow ◽  
Solar Fraction ◽  
Wide Range ◽  
Flow Circuit

A modification to the f-Chart method has been developed to predict monthly and annual performance of thermosyphon solar domestic hot water systems. Stratification in the storage tank is accounted for through use of a modified collector loss coefficient. The varying flow rate throughout the day and year in a thermosyphon system is accounted for through use of a fixed monthly “equivalent average” flow rate. The “equivalent average” flow rate is that which balances the thermosyphon buoyancy driving force with the frictional losses in the flow circuit on a monthly average basis. Comparison between the annual solar fraction predited by the modified design method and TRNSYS simulations for a wide range of thermosyphon systems shows an RMS error of 2.6 percent.

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