Solar thermal Pre-heated hot water to feed boiler as make up water.(Cost saving)

 

Solar Thermal can provide Hot water of about 70 to 80 Degrees C with free sunlight.

Water heating cost, 

example,                      

                How much kw to heat 100 liters of water?                           

                for example, 100 liters of water, to be heated from 10ºC to 42ºC,                              

                giving a temperature rise of 32ºC would give – 100 x 4 x 32 / 3412 =                         

                3.75 meaning that the water would be heated in 1 hour by                         

                 3.75kW of applied heat.                              

                Liters     100        

                Initial temperature Deg C             10          

                Final temperature Deg C               42          

                Rise in Temperature=    32          

                Kwh=L*4*Delta t/3412  3.751465416      

                                                                              

                Boiler                   

                Boiler's make up water                 

                                                                                                    Winter                Summer

                Temperature Degrees, C                                                   26                           30

                Daily required L/hour                                                        1500                      1500

                final temperature by solar thermal system                         75                           75

                Rise in Temperature=                                                          49                          45

                Kwh=L*4*Delta t/3412                                                        86.2                     79.1

                Unit cost, Rs/unit                                                                   35                         35

                Rs/hour cost                                                                           3016                    2770

                Per day liters                     

                Temperature Degrees, C                                                        26                      30

                Daily required L/hour                                                           15000                15000

                final temperature by solar thermal system                            75                       75

                Rise in Temperature=                                                             49                       45

                Kwh=L*4*Delta t/3412                                                          861.7                791.3

                Unit cost, Rs/unit                                                                     35                       35

                Rs/hour cost                                                                              30158                27696

                                               

                                               

                The solar-preheated water can also be fed to an economizer or exhaust air                             

                heating system.                               

                it will increase the steam-making efficiency.                        

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