Abstract
In hot and humid summer as in Japan, dehumidification is important process for air conditioning. Desiccant air handling unit is one of the major system for dehumidification in which absorbent or sorbent absorbs moisture in the air and hot heat source is required in order to regenerate them. In order to use solar thermal energy efficiently, flexible control, which controls the distribution of the dehumidification at precooling coil and dehumidification wheel, is proposed and analysed its performance through simulation. Simulation results show that supply absolute humidity fulfils the set point even when solar thermal energy is not supplied to regenerating coil under flexible control. On the other hand, system with conventional fixed control can not fulfil the set absolute humidity when solar thermal energy is not supplied. The unprocessed latent heat load is around 49kW, which results in higher relative humidity around 56.5%. Solar thermal energy supplied to regenerating coil under flexible control is larger than fixed control.
Highlights
In hot and humid summer as in Japan, dehumidification is important process for buildings in terms of air quality and thermal comfort
Air state entering dehumidification wheel is stable at 18°C, on the other hand, air state before dehumidification wheel with flexible control varies from 13.9°C to 19.5°C
Absolute humidity with flexible control is fulfilled the set point even when solar thermal is not used to regenerating coil
Summary
In hot and humid summer as in Japan, dehumidification is important process for buildings in terms of air quality and thermal comfort. Mechanical dehumidification is commonly used to reduce moisture content of the air flow. Most of the dehumidification process is conducted by reducing the air temperature lower than its dew point, which is so called condensation dehumidification. The desiccant air handling unit can reduce moisture of the air by adsorption phenomena of substances including silica gel or polymer sorbent. These are required to be regenerated periodically. Waste heat from combined heat and power (hereafter, CHP) or heat pumps, and hot water from solar thermal system is typically used
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