Abstract
The main objective of this study was to develop a thermoelectric heat pump and liquid desiccant system based on a dedicated outdoor air system (THPLD-DOAS). An internally-cooled and -heated liquid desiccant system was used and a thermoelectric heat pump (THP) served as the desiccant cooling and heating energy source for dehumidification and regeneration of the desiccant solution, respectively. In order to investigate the energy-saving potential of the proposed system, its thermal performance and operating energy consumption during the cooling season were compared to those of a conventional dedicated outdoor air system with a ceiling radiant cooling panel system (DOAS-CRCP). Detailed simulations for each system were conducted under hot and humid climatic conditions. Their thermal performance under various room sensible heat factor (RSHF) conditions was evaluated to observe the energy performance, depending on the dehumidification performance, of the liquid desiccant system integrated with the THP. The results showed that the coefficient of performance (COP) of the THP ranged from 0.8 to 1.2 to maintain a sufficient dehumidification rate. The operating energy of the THPLD of the proposed system was 6.6% to 16.0% less than that of the chiller operating energy of a conventional DOAS. Consequently, the proposed system consumed 0.6–23.5% less operating energy compared to the conventional DOAS.
Highlights
Dedicated outdoor air systems with a ceiling radiant cooling panel (DOAS-CRCP) have been thoroughly investigated over the past few decades and are widely applied to a broad range of buildings [1,2,3,4,5]
In order to estimate operating energy consumption of a DOAS integrated with the THP-Assisted Liquid Desiccant (THPLD), a model building was the operating energy consumption of a DOAS integrated with the THPLD, a model building defined and its cooling load was initially estimated using a TRaNsient Systems Simulation was defined and its cooling load was initially estimated using a TRaNsient Systems Simulation (TRNSYS) 17 [41] program
In order operate the under partial load,was thedesigned current variednumber
Summary
Dedicated outdoor air systems with a ceiling radiant cooling panel (DOAS-CRCP) have been thoroughly investigated over the past few decades and are widely applied to a broad range of buildings [1,2,3,4,5]. The DOAS-CRCP ensures the decoupling of sensible and latent cooling functions in the air conditioning process and in the distribution of required ventilation for spaces. The DOAS meets the ventilation and latent cooling demands, while the CRCP is responsible for sensible cooling. Independent control of temperature and humidity, and proper ventilation in the DOAS-CRCP operation can enhance the indoor environmental quality and obtain operating energy savings compared to conventional air conditioning (AC) systems [6,7]. In order to enhance the humidity control and energy saving performance of the DOAS, a liquid desiccant-assisted DOAS has been proposed [8,9,10,11]. In the liquid desiccant unit, the strong desiccant solution entering the absorber should be cooled to enhance its dehumidification performance, and the weak solution entering the regenerator
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