Performances of LiBr absorption-type heat pumps

Studies the influence of middle temperature water on the performances of LiBr absorption-type heat pump unit under the constant flow rate/variable temperature difference and variable flow rate/constant temperature difference conditions. The results show that under the constant flow rate/variable temperature difference condition, the smaller the middle water temperature difference, the higher the coefficient of performance (COP), but in the test the change rate is less than 8%. When under the variable flow rate/constant temperature difference condition and middle temperature water flow ratio higher than 75%, the COP slightly decreased; but when middle temperature water flow ratio lower than 75%, the COP obviously changed.