Water Cooled Chiller Efficiency Calculation

Cooling tower efficiency.

Water cooled chiller efficiency calculation.

I am interested in the statement made at the end of the article. Calculate tons of cooling capacity tons btu hr. Calculations assume that efficiency ratings entered by the user are based. Cooling tower efficiency.

Water cooling system difference between. So for evaluating chiller efficiency at different part load condition iplv or nplv is calculated. Oversize the chiller by 20 ideal size in tons tons x 1 2. 1 cooling tower ton 1 tons evap 1 tons cond x 1 25 15000 btu h 3782 k calories h 15826 kj h 4 396 kw.

40gpm x 60 x 8 33 x 12 f 239 904 btu hr. In the ideal case the cold water temperature will be equal to the wet bulb temperature. The calculation of cooling tower efficiency involves the range and approach of the cooling tower. Now lets look at how to calculate the cooling capacity of a chiller in imperial units.

This equivalent ton is defined as the heat rejection in cooling. Base model values represent a 100 ton air cooled electric chiller operated for 2 000 full load hours per year with an eer of 9. In practice the cooling tower efficiency will be in between 65 to 70. This means that for every 1kw of electricity you put into the machine you will produce 5 4kw of cooling.

Cooling tower efficiency is limited by the ambient wet bulb temperature. I just read the article real efficiencies of central plants may 2007 and completely agree that few chiller plants attain the efficiency kilowatts per ton that we would like to see. In fact in most cases i doubt we can make peak efficiency at full load operation let alone at part loads. Calculation of iplv and nplv.

You have the ideal size for your needs. A cooling tower ton is defined as. For example what size chiller is required to cool 40gpm from 70 f to 58 f t f 70 f 58 f 12 f. Performance of chiller is measured at different loading condition say 100 75 50 25 and iplv or nplv is calculated.

The flow rate of chilled water into the evaporator is measured as 12 649ft3 h and the chilled water inlet temperature is 53 6 f the outlet temperature is 42 8 f. In summer season the ambient air wet bulb temperature raises when compared to winter season so cooling tower efficiency limiting in summer season. With this information you can calculate chiller efficiency in terms of the energy efficiency ratio or eer and the coefficient of performance or cop for chillers. 2 500kw 460kw 5 4 so the cop is 5 4.

Default values the values pre loaded into the calculator represent average operating conditions in the federal sector. How to calculate the efficiency of a chiller imperial and metric. The equivalent ton on the cooling tower side actually rejects about 15000 btu h due to the heat equivalent of the energy needed to drive the chiller s compressor. The average temperature is 48 2 f so we need to calculate the water properties at.

The performance of this standard unit is based on ashrae standard 90 1.