A new ceiling cooling panel of capillary porosity wick(CCPCPW) which was configured by porous media of potassium citrategypsum was put forward to reduce high energy consumption and improve comfort of the air conditioning heat pump unit.In this case,when water is cooling the medium,CCPCPW behaves like a uniform channel.In the paper,the flow resistance in CCPCPW and the serpentine radiant heat transfer pipes(SRHTP) was studied by experiment.A comparison of resistance between CCPCPW and SRHTP was made when the flow rate of cooling water was ranged in 4-40 L/h; moreover,the Ca2+ concentration in circulating water were tested by the ICPOptional Emission Spectrometer in CCPCPW when the unit was run for 1 200 hours.The results showed that the lower permeability of CCPCPW leads to a larger resistance compared to SRHTP when the flow rate is less than 17 L/h.However,when the flow rate is larger than 17 L/h,the larger permeability of CCPCPW results in a lower flow resistance compared to SRHTP.This suggests the inertial force by the disturbance of CCPCPW is smaller than SRHTP,and the friction factor of CCPCPW is smaller.After running for 360 hours,the Ca2+ concentration has been stable to make sure the recirculation water can be used for a long period of time in the air conditioning system.
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