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Energy Balance of Solar Water Heaters - Thermosyphonic Systems

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Last edited by Joseph Nowarski
December 5, 2017 | History

Energy Balance of Solar Water Heaters - Thermosyphonic Systems

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Publish Date
Publisher
academia.edu
Language
English
Pages
75

This work introduces a methodology for determination of energy balance for solar water heater (SWH).
Solar legislation in Israel requires installation of solar water heaters in new buildings up to 9 floors from roof. The legislation from year 1980 is based on technology of late 70's. This publication compares old types of installation (steel pipe) with the current common practice (2017) of installation of solar water heaters in Israel.
The results are energy losses for circulation pipes, hot water supply pipes and storage tank.
The publication introduces also the Israeli system of determination of size of solar water heater and describes the procedure to determine amount of energy gained by the heater every month. It analyzes thermosyphonic systems, but may be helpful to analyze also forced circulation systems.
The balance is for demand scenario as determined using national statistics (unique for Israel). The balance shows that in most months of the year SWH supplies more hot water than required for sanitary use. Most of the hot water from solar energy is used for showers while the rest may be used for other applications like washing machines and dishwashers.
The balance shows that the main losses of energy are for storage tank envelope, while hot water supply pipes are minor energy users.
This work may be helpful for techno-economic evaluation of water heating options and determination of the optimum solutions. It also contains large volume of useful data and information and can serve as solar water heating manual or basic material for solar energy study.

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Book Details


Table of Contents

1. Glossary
2. Introduction
3. Energy Units
4. Solar Radiation
5. Tilt Angle
6. Solar Water Heater
7. Energy Output of Solar Collector
8. Monthly Changes of Collector's Energy
9. Collector's Efficiency
10. City Water (Cold Water) Temperature
11. Storage Tank Average Temperature
12. Water Stratification
13. Circulation Pipes Length
14. Circulation Hours
15. Ambient Temperatures in Circulation Hours
16. Water Temperature in Circulation Pipes
17. Hot Water Supply Temperature
18. Water Flow
19. Energy Demand for Hot Water
20. Energy Losses
21. Conservative Approach
22. Formulas, Input Values and Detailed Calculations
23. Pipes Length for Energy Balance
24. Energy in Water Losses in Circulation Pipes (CircEW)
25. Initial Heating of Circulation Pipes and Insulation Mass (CircM)
26. Heat Transfer in Circulation Pipes (CircHX)
27. Energy Losses in Hot Water Supply Pipe
28. Heat Transfer in Hot Water Supply Pipe Located Outside
29. Heat Transfer in Hot Water Supply Pipe Located Inside
30. Heat Exchange in Hot Water Supply Pipe – Total (SupHX)
31. Energy in Water Losses in Hot Water Supply Pipe (SupEW)
32. Initial Heating of Hot Water Supply Pipe and Insulation Mass (SupM)
33. Storage Tank Heat Transfer (STHX)
34. Initial Heating of Storage Tank Mass (STM)
35. "Other" Losses
36. Crosscheck of Storage Tank Average Temperature
37. Sum of Losses
38. Energy Balance of SWH
39. Need for Backup for Each Additional Floor
40. References

The Physical Object

Format
eBook
Number of pages
75

ID Numbers

Open Library
OL26404671M
Google
TBZ5BLL8WGD, f8M2DwAAQBAJ

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History

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December 5, 2017 Edited by Joseph Nowarski Added new cover
December 5, 2017 Edited by Joseph Nowarski Edited without comment.
December 5, 2017 Created by Joseph Nowarski Added new book.