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What is the simple design for solar water heaters?

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Question ajoutée par Haitham Shehab , MEP Construction Manager , China State Construction Engineering Corporation Ltd.
Date de publication: 2014/03/31
Nidal Abdalla
par Nidal Abdalla , Senior Studies and consultation specialist , National Energy Research Center / RSS

Role of thumb for sizing the SWH.

Average daily solar energy at most of Arab countries on horizontal surfacs is between5 to6 kWh/m2.

Assume average daily solar energy =5.6 kWh/m2

Average solar collector efficiency =40 %.

If daily of hot water needed is500 liters at55° C.

Useful energy =5.6 kWh *0.40 = 2.24 kWh /d /m2

Q = m * Cp * (55 –18)

=500 kg *4.186 kJ/(kg °C) *37 °C =77,441 kJ / d

77,441 kJ /3,600 = 21.5 kWh / d

Collector area = 21.5 / 2.24 =9.6 =10 m2

Qasim N Qasim
par Qasim N Qasim , Senior Sales Engineer , Mohamed Abdulrahman Al-Bahar & Sons - Caterpillar Dealer

Thermo-Syphon System

 

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