Experimental research on performance of fan coil units under low temperature and large temperature difference conditions

Tests the performance parameters of different types of fan coil units. The results show that the cooling capacity of fan coil unit under low temperature and large temperature difference conditions, such as 3 ℃/13 ℃, 4 ℃/12 ℃ and 5 ℃/12 ℃, is better than that under the standard condition. When the supply water temperatures are 3, 4, 5, 6, 7, 8 ℃ respectively, the water resistance under 10 ℃ temperature difference condition can be reduced by more than 70.0% compared with that under the 5 ℃ condition. When the temperature differences between supply water and return water are 5, 6, 7,8, 9,10 ℃ respectively, the water resistance under 3 ℃ supply water temperature condition can be decreased by more than 45.6% compared with that under the 8 ℃ supply water temperature condition. Obtains the modified formula of cooling capacity, moisture absorption coefficient and water resistance coefficient by fitting the actual performance parameters of fan coil unit under low temperature and large temperature difference conditions, which can provide a reference for the selection of fan coil unit under similar conditions.