Abstract: As an important fire prevention and control tool, the maintenance of fire hose is particularly important. Timely drying of the hose can extend the service life of the hose and ensure that it is always in good working condition. To reduce the drying energy consumption of fire hose and optimize the drying performance of heat pump, the heat pump drying treatment of fire hose is performed with variable temperature strategy. The effects of initial drying temperature, moment of changing temperature, and variable temperature on the performance of heat pump (specific moisture extraction rate, moisture extraction rate, coefficient of performance) were analyzed by single factor test. Experiments were designed using the response surface method, the mathematical model was fitted to the test data, and the reliability of the model was verified by variance analysis. The multi-objective joint solution of the regression equation was carried out, and the optimal process parameters of the heat pump variable temperature drying fire hose were obtained as follows: initial drying temperature was 42.2 ℃ , the moment of changing temperature was 80 min, and the variable temperature was 33.8 ℃.Parallel experiments show that the average error between the predicted value and the experimental value is 3.92%, indicating the high reliability of the model.

Key words: fire hose, heat pump drying, variable temperature drying, heat pump performance, strategy optimization