The water-enthalpy method cooling capacity source could be applied in the calibration of cooling capacity measuring apparatus. It could supply a cooling capacity which was measurable and controllable.First

the principle of water-enthalpy method was illustrated

then the physical structure of the source was designed and developed.After that

the source was experimentally investigated in an air enthalpy method test rooms

the results of the energy transformation of fan's electric power experiments showed that:the fan's electric power transformed into thermal energy totally and the energy could be measured by air enthalpy method test rooms.Finally

the stability experiment and the evaluation of uncertainty were conducted

the results showed that the outputted cooling capacity standard deviation of 30 min was 22.2 W (cooling capacity 5251.9 W) and the related expanded uncertainty was 0.6% (k=2).This source achieved the traceability of cooling capacity from the perspective of metrology for the first time

and the cooling capacity could be traced to temperature

pressure

flow rate and electric power.