primotech solar water heater
TRANSCRIPT
Solar Water Heating
What do SWH systems provide?
• Domestic Hot Water• Process Heat• Swimming Pool
Heating
…but also…
• Increased hot water storage• Extended swimming
season (pool heating)
Components of SWH Systems
Unglazed Solar Collectors
• Low cost
• Low temperature
• Rugged
• Lightweight
• Seasonal pool heating
• Low pressure• Poor performance in cold or windy weather
Glazed Flat Plate Solar Collectors
• Moderate cost
• Higher temperature operation
• Can operate at mains water pressure
• Heavier and more fragile
Evacuated Tube Collectors
• Higher cost
• No convection losses
• High temperature
• Cold climates
• Fragile
• Installationcan be more complicated
• Snow is less of a problem
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
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
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
• Hotels/motels, apartments and office buildings• Health centres & hospitals• Car washes, laundromats, restaurants• Sport facilities, schools, shower facilities• Aquaculture, other small industry
Contd…..
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
Primotech Energy Solutions SWH Energy Calculation
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
Thank You