Performance Of Cooling Tower

Performance Of Cooling Tower 

Cooling tower performance

The vital Parameters, from the purpose of determinant the performance of cooling towers, are:

"Range" is that the difference between the cooling tower water Inlet and outlet temperature. 

"Approach" is that the difference between the cooling system outlet cold water temperature and close wet bulb temperature. Although, each vary and approach ought to be monitored ,

the 'Approach' may be a higher indicator of cooling system Performance. cooling system effectiveness (in percentage) is that the ratio of range, to the perfect range, i.e.,difference between cooling water water temperature and close wet bulb temperature, 

or in alternative words it's = range / (range +Approach).                                                                                       

                          

Cooling capability is that the heat rejected in kCal/hr or TR, given as product of mass rate of water, heat and temperature distinction.                                                                                        

Evaporation loss is that the water amount gaseous for cooling duty and, on paper, for each 10,00,000 kCal heat rejected, evaporation amount works resolute one.8 m cube. Associate in Nursing empirical relation used typically is:                      

   

Evaporation Loss (meter cube/hr) = 0.00085 × 1.8 × circulation rate (m cube/hr ) × (T1-T2)                                                       

        T1-T2 = temporary difference  between inlet water and outlet water.                                                                                                                                                                 

Cycles of concentration (C.O.C) is the quantitative relation of dissolved solids in current water the dissolved solids in structure water.                                                                                                                                       Blow down losses depend on cycles of concentration and therefore the evaporation losses and is given by relation:

       Blow Down=Evaporation Loss / (C.O.C.-1)

Liquid/Gas (L/G) ratio, of a cooling tower is the ratio between the water and the air mass flow rate. Against design values, differences due to the season need adjustment and standardisation of water and air flow rates to induce the simplest cooling system effectiveness through measures like water box loading changes, blade angle changes. 

Thermodynamics additionally dictate that the warmth aloof from the water should be adequate the warmth absorbed by the encompassing air:

                      L(T1-T2) = G(h2 - h1)    

  

                       L/G= h2-h1/T1-T2          

Where:         

              L/G = liquid to gas mass flow quantitative relation (kg/kg)    

              T1    = predicament temperature (°C)

              T2    = cold water temperature (°C)

              h2    = total heat of air-water vapour mixture at exhaust wet-bulb temperature (same units as above)

              h1   = total heat of air-water vapour mixture at water wet-bulb temperature (same units as above)