Design calculation method for stratified air conditioning hourly cooling load in large-space buildings

Based on the heat balance principle, this paper analyses the composition of the stratified air conditioning cooling load and develops a calculation method for stratified air conditioning hourly cooling load in large-space buildings. Taking a large-space thermal environment experimental building in Shanghai with two stratified air conditioning forms as the research object, the results show that in three cases of middle nozzle air supply stratified air conditioning system, the mean absolute percentage error (MAPE) between the calculated cooling load and the experimental cooling capacity is 6.6%. In three cases of low-sidewall air supply stratified air conditioning system, the MAPE is 4.6%. After verification, combined with two calculation cases of these two stratified air conditioning forms, the stratified air conditioning hourly cooling load is solved. Under the same design conditions, the cooling load index of the middle nozzle air supply system is 108 W/m2, and that of the low-sidewall air supply system is 76 W/m2. It can be seen that the peak load of the low-sidewall air supply system is only 70.4% of that of the middle nozzle air supply system. The proposed calculation method for stratified air conditioning hourly cooling load can be used as a reference for the engineering design of stratified air conditioning system.