Concept of Solar Water Heater that is to save energy and to make use of renewable sources of energy to full extent.

1. Solar Water Heating

2. What do SWH systems provide?
• Domestic Hot Water
• Process Heat
• Swimming Pool
Heating
…but also…
• Increased hot water
storage
• Extended swimming
season (pool
heating)

3. Components of SWH Systems

4. Unglazed Solar Collectors
• Low cost
• Low temperature
• Rugged
• Lightweight
• Seasonal pool
heating
• Low pressure
• Poor performance in cold or windy weather

5. Glazed Flat Plate Solar Collectors
• Moderate cost
• Higher temperature
operation
• Can operate at
mains water
pressure
• Heavier and more
fragile

6. Evacuated Tube Collectors
• Higher cost
• No convection losses
• High temperature
• Cold climates
• Fragile
• Installation
can be more
complicated
• Snow is less of
a problem

7. Solar Water Heating Project
Considerations
• Factors for successful projects:
• Large demand for hot water to reduce importance of fixed costs
• High energy costs (e.g. natural gas not available)
• No reliable conventional energy supply
• Strong environmental interest by building owner/operator
• Daytime hot water loads require less storage
• Lower cost, seasonal systems can be financially preferable to higher-cost
year-round systems
• Maintenance similar to any plumbing system, but operator must be
committed to timely maintenance and repairs

8. Domestic Hot Water Systems
• On-grid, need a committed homeowner
• Can have long payback when energy prices are low
• Systems provide 20 to 80% of hot water
• Off-grid or where the energy supply is unreliable

9. Swimming Pool Systems
• Low-cost unglazed collectors
• Summer pools in cold climates
• Extend the season in warm climates
• For summer use on a year-round pool in cold climates
• Can have 1 to 5-year paybacks
• Glazed collectors for heat year-round
• Filtration system serves as pump

10. • Hotels/motels, apartments and office buildings
• Health centres & hospitals
• Car washes, laundromats, restaurants
• Sport facilities, schools, shower facilities
• Aquaculture, other small industry
Contd…..

11. Primotech Solar Water Heating
Project Model
• World-wide analysis of energy production, life-cycle costs and
greenhouse gas emissions reductions
• Glazed, unglazed, and evacuated tube
• Indoor and outdoor swimming pools
(w/ or w/o cover)
• Service hot water systems
(w/ and w/o storage)
• Only 12 points of data for Primotech Energy
Solutions vs. 8,760 for hourly simulation models
• Currently not covered:
• Changes in service hot water daily loads
• Stand-alone service hot water
• Systems w/o storage having
high solar fractions
• Sun tracking, concentrator & integrated solar collectors

12. Primotech Energy Solutions
SWH Energy Calculation

13. Conclusions
• Unglazed, glazed and evacuated tube collectors provide hot water for many
uses in any climate
• Significant hot water demand, high energy costs, and strong commitment on
part of owner/operator are important factors in success
• Primotech Energy Solutions Pvt . Ltd. calculates:
• Service hot water load and swimming pool load
• Performance of solar swimming pool and service hot water systems with or without storage
• Primotech Energy Solutions Pvt . Ltd. is an annual analysis with monthly
resource calculation that can achieve accuracy comparable to hourly simulation
models
• Primotech Energy Solutions Pvt . Ltd. can provide significant preliminary
feasibility study cost savings

14. Thank You