No products
View larger
C08 -- Applying the new Effective Strategies of HVAC System Design with the Focus on Sustainable Development in Public Buildings
M00007791
New product
C08 -- Applying the new Effective Strategies of HVAC System Design with the Focus on Sustainable Development in Public Buildings in Humid Subtropical Climates
Conference Proceeding by ASHRAE, 2022
Ali Reza Haddadi, PE; Esmaeil Jalali Lavasani, PhD
In stock
More info
Full Description
The fact that humidity control of indoor spaces in humid climates is one of the key elements in the design to considerhowever, the challenges are significant energy costs associated with dehumidification such as people's fresh air providing.Since the latent load is remarkable in the fresh air, full fresh air systems (by DOAS units) face a severe challenge indehumidifying air in these areas.
This paper presents a new method to curb the dependence of HVAC systems on electricity usage in public buildings. In thisapproach, an ice storage system, which runs in non-peak load time, supplies the chilled water for dehumidification coils.Hence, the dehumidification coils are applied plus conventional coils to every terminal unit to control the humidity of everyzone. In other words, all air handling units take advantage of 6-pipe coils (2-pipe for cooling coil, 2-pipe for heating coil, and2-pipe for dehumidification coil), and every fan coil unit is similarly equipped with 4-pipe connections of coils by adding thedehumidification coil to the conventional unit. All cooling coils are supplied with central chiller units, whereas thedehumidification coils are fed using an ice storage system to mitigate electricity usage in peak loads.
A passenger terminal has been selected to study in an area with high dry bulb temperature and high relative humiditysimultaneously (JASK harbor in Iran) to prove the effectiveness of this method. In this case, because of the high ceiling ofthe terminal hall, the displacement ventilation alongside the air to air energy heat recovery exchanger could handle the wasteof energy. In addition, using 3-way control valves on each dehumidification coil, humidistats at indoor spaces, and a DDCcontroller for central systems could provide thermal comfort for people. Finally, the results are reported by eQuest 3.65.The proposed approach results of the case study building demonstrated a 26.2% to 57.6% reduction in electricityconsumption. Moreover, if this novel method applies to large public buildings in humid subtropical areas as a new solution,it is more likely that the use of fossil fuels and consequently carbon dioxide (CO2) emissions can be limited in the near futurefor these areas.