1) In accordance with the first law of thermodynamics, an 1250kW single effect absorption chiller with...

1) In accordance with the first law of thermodynamics, an 1250kW single effect absorption chiller with a COP of 0.86 will require a heat source of ______ kW and a heat rejection sink of ______ kW 2) If you were to change the absorption chiller specification to a double effect absorption chiller with a COP of 1.26, the heat source requirement would change to be _____ kW and a heat rejection sink of _______ kW would be needed in order to thermally power the cycle. 3) In your own words, describe what the difference between single and double effect absorption chillers in terms of their heat source requirements. Reference should be made to difference temperature requirements and a description on an installation that would be suitable for the deployment of each. Also include a summary of some of the common problems experienced with absorption chillers. 4) You have installed a large absorption chiller that provided a chilled water output of 4152 MWh in the last 12 months. The electric chiller that this machine replaced operated at an average COP of 4.36. How much electricity (MWh) did you save in the last 12 months?

Expert Solution

1) In accordance with the first law of thermodynamics, an 1250kW single effect absorption chiller with a COP of 0.86 will require a heat source of 2325 kW and a heat rejection sink of 1075 kW

W = 1250 kW

COP = QC / W

0.86 = QC / 1250

QC = 1075 kW

QH - QC = W

QH - 1075 = 1250

QH = 2325 kW

2) If you were to change the absorption chiller specification to a double effect absorption chiller with a COP of 1.26, the heat source requirement would change to be 2825 kW and a heat rejection sink of 1575 kW would be needed in order to thermally power the cycle.

W = 1250 kW

COP = QC / W

1.26 = QC / 1250

QC = 1575 kW

QH - QC = W

QH - 1575 = 1250

QH = 2825 kW

samet mamat answered 2 years ago

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