Solar Rooftop PV System

For Hospitals

Presented by :Atul A. Nalawade – Director

United Energy Systems Pvt. Ltd.

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Sustainability & Sustainable Development can be achieved though “Energy Efficiency”, “Conservation of Energy” Or “Using Natural Energy Resources like “SOLAR ENERGY” for producing Energy”………..

OVERVIEW

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ENERGY EFFICIENCY

Efficiency in Architecture : Passive Solar Daylighting Natural Ventilation Evaporative Cooling

Efficiency in Operations : Reduce Plug in Loads Replace Boilers/furnace with renewable sources.

HOWEVER MOST OF THE SYSTEMS ARE INCOMPLETE OR IMPOSSIBLE TO MEASURE . . . . . .

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INTRODUCING SOLAR PV SYSTEMS

Hospitals both in urban and rural areas consume a lot of energy throughout the day as the electrical equipment used directly or indirectly to treat patients require uninterrupted power. Many hospitals have considerable unused rooftop space. Combined with power shortages and rising cost of diesel, rooftop solar power makes a compelling case for implementation in hospitals; there are several advantages but also several constraints that need to be considered when deciding on and designing a rooftop solar power system for a hospital, such as using a variable source of power like solar to power equipment used in life saving situations.

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Why Rooftop PV Solar ?

Rooftop solar power can meet up to 20% of a hospital’s electricity requirements. If your hospital consumes a lot of diesel for power generation, rooftop solar can abate up to 20% of your diesel bills, subject to timing of load shedding. 100 SF of shade-free rooftop space can provide 4 kWh of solar power per day, on average

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Advantages

Flexible configurations – Solar panels can be installed on different kinds of roofs, including covered parking areas, as long as the structure can bear the weight of the panels. They are also highly scalable, with rooftop plants ranging in capacity from less than 1 kW to more than 1 MW

Reliable

Energy Security

Min. Mainten

ance

Cost Effective

Flexible Configur

ations

Reliable – A solar power plant has no moving parts, ensuring reliable power over 25 years

Minimal maintenance – A solar plant requires very little maintenance from the energy consumer

Cost-effective – Rooftop solar power has a levelised cost of Rs. 8/kWh (or less), considerably lower than diesel power at Rs. 18/kWh (or more). Additionally, your energy cost is now fixed for the next 25 years, unlike diesel power which keeps increasing.

Energy security – Rooftop solar plants can deliver power during load-shedding, ensuring that critical loads are always running.

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Constraints

Inverter WeightInverter Weight

Rooftop Space

Rooftop Space

Daylight Power

Daylight Power

Infirm PowerInfirm Power

Load Shedding Timings

Load Shedding Timings

Rooftop space – The capacity of the solar plant that can be installed in a hospital may be constrained by lack of sufficient shadow-free rooftop space. A rule of thumb is that you will need about 100 SF of shade-free roof area for 1 kW of solar panels. Insufficient roof area will mean that the capacity of the solar plant on your roof may be sufficient to meet only part of your electrical load

Infirm power – Solar power is dependent on the sun shining, and output varies depending on meteorological conditions e.g., passing clouds can temporarily reduce the solar plant’s output. Therefore solar power for critical equipment should be used in conjunction with another source of power. This is a critical part of the design for hospitals, where solar may be used to power life-saving equipment

Daylight power – Solar power is only available when the sun shines. Therefore night time applications will require other sources of power, or power from batteries charged through solar

Load-shedding timings – If your hospital experiences load shedding primarily at night, solar power may not help in reducing your diesel consumption as it is available only during the day.

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Typical Load

As the rooftop space may not be sufficient to support the entire electrical load of your facility with solar, it becomes necessary to estimate the different kinds of loads to identify loads that can be/need to be supported by solar.

Typical electrical loads in a hospital includes : Lighting Fans Refrigeration units Air conditioning Other electrical equipment

Air conditioning is usually the heaviest load, accounting for more than half the energy consumed. Air conditioning is not a critical load in many companies; hospitals, however, may have some air conditioning load, such as in operation theatres or ICUs, where air conditioning has to run even during load shedding.

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Our Recommondations

The need for uninterrupted, constant power and possibly limited roof space necessitates rooftop solar power being used in conjunction with other sources of power such as utility power, diesel generator, and/or batteries.

Grid Connected Solar PV System

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Our Recommondations

Off-Grid Solar PV System

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Our Recommendations

Hybrid (Solar + Diesel Generator) Solar PV System

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Grid-Tied Solar PV System

As the rooftop space may not be sufficient to support the entire electrical load of your facility with solar, it becomes necessary to estimate the different kinds of loads to identify loads that can be/need to be supported by solar.

Typical electrical loads in a hospital includes : Lighting Fans Refrigeration units Air conditioning Other electrical equipment

Air conditioning is usually the heaviest load, accounting for more than half the energy consumed. Air conditioning is not a critical load in many companies; hospitals, however, may have some air conditioning load, such as in operation theatres or ICUs, where air conditioning has to run even during load shedding.