This study examined the impact of sorption recovery wheel control methods on cooling capacities in office buildings. The experimental part of the study was based on the operation of the air handling units’ recovery wheel inlet and outlet air, as well as the measurement of dry-bulb temperature and relative humidity, indoor climate system controls, and set points gathered from the building management system. The outdoor and return air enthalpy difference control method was assessed against dry-bulb temperature difference controls. As a result, the enthalpy difference control method is more effective due to the latent heat content of the outdoor and return air. Thus, under the measured outdoor and return air dry-bulb temperature conditions, an enthalpy difference control method could reduce the cooling coil’s energy demand to 83% and reduce the supply air water content by ~0.9 g/kg compared to the temperature difference-based method. In condensate-free cooling systems, the supply air’s water content can increase the room air’s dew point temperature, which in turn affects the zones’ cooling systems’ performance or causes condensation in the zone cooling loop. This study demonstrated that in Nordic countries, with relatively high ambient water content and low ambient dry-bulb temperatures, enthalpy difference-based control of sorption recovery is more effective during the cooling period in terms of supply air dehumidification and cooling energy needs.

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

Impact of Sorption Recovery Wheel Control Method on Cooling Capacity in a Nordic Office Building

  • Jevgeni Lukaštšuk,
  • Martin Thalfeldt

摘要

This study examined the impact of sorption recovery wheel control methods on cooling capacities in office buildings. The experimental part of the study was based on the operation of the air handling units’ recovery wheel inlet and outlet air, as well as the measurement of dry-bulb temperature and relative humidity, indoor climate system controls, and set points gathered from the building management system. The outdoor and return air enthalpy difference control method was assessed against dry-bulb temperature difference controls. As a result, the enthalpy difference control method is more effective due to the latent heat content of the outdoor and return air. Thus, under the measured outdoor and return air dry-bulb temperature conditions, an enthalpy difference control method could reduce the cooling coil’s energy demand to 83% and reduce the supply air water content by ~0.9 g/kg compared to the temperature difference-based method. In condensate-free cooling systems, the supply air’s water content can increase the room air’s dew point temperature, which in turn affects the zones’ cooling systems’ performance or causes condensation in the zone cooling loop. This study demonstrated that in Nordic countries, with relatively high ambient water content and low ambient dry-bulb temperatures, enthalpy difference-based control of sorption recovery is more effective during the cooling period in terms of supply air dehumidification and cooling energy needs.