The cooling is often accomplished via a refrigeration cycle, but sometimes evaporation or cost-free cooling is utilised. Air conditioning devices can also be built determined by desiccants (chemicals which take away dampness with the air). Some AC methods reject or retailer heat in subterranean pipes.[two] The vapor-compression cycle can take https://docs.google.com/spreadsheets/d/12u7rJLrjSWIMoTyNzJz1omJPJnoZX4A_U0YLwoyEYUk