Multi-stage desiccant cooling system for moderate climate

Pandelidis, Demis; Pacak, Anna; Cichoń, Aleksandra; Anisimov, Sergey; Drąg, Paweł; Vager, B. G.; Vasilijev, Vladimir

doi:10.1016/j.enconman.2018.09.061

Cited by 33 publications

(16 citation statements)

References 28 publications

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“…For instance, the impact of outdoor humidity was mentioned in [8], but the air temperature and humidity level in the conditioned space was not discussed. The same observation is true for a very recent study on two-stage desiccant system [19,20].…”

Section: Introductionsupporting

confidence: 70%

Dehumidification Potential of a Solid Desiccant Based Evaporative Cooling System with an Enthalpy Exchanger Operating in Subtropical and Tropical Climates

2019

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The technical and economic attractiveness of a solid desiccant based evaporative cooling system depend on several factors: Configuration of the system components and their individual performance, availability of cheap but reliable regeneration heat source. In the tropical and subtropical regions, the air conditioning systems are expected to address not only the sensible loads but also, and most importantly—the loads due to higher outside humidity levels that can severely affect the thermal comfort of the building occupants. This paper reports on the dehumidification potentials of solid desiccant based evaporative cooling systems with an enthalpy exchanger operating in subtropical and tropical climates. In particular, the study presents the cooling and dehumidification capabilities of the enthalpy exchanger observed through the impact of its sensible and latent effectiveness on the thermal comfort of the conditioned space. The key performance indicators are split into two groups: (1) the thermal comfort of the conditioned space, and (2) the coefficient of performance. It was found that this cooling system with enthalpy exchanger performed better than the one without enthalpy exchanger in terms of dehumidification; however, the impact depends on the climate where the system operates.

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Section: Introductionsupporting

confidence: 70%

Dehumidification Potential of a Solid Desiccant Based Evaporative Cooling System with an Enthalpy Exchanger Operating in Subtropical and Tropical Climates

2019

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“…These models are created with an assumption that the airflow is treated as gaseous fluid, which has temperature, velocity and mass transfer potential equal to bulk average values in sections normal to the plate surface of heat exchanger. Models equations, validation of these models are presented in author's previous works [10,11]. Main system components characteristics are presented in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…In this system, the ambient air is cooled two times, both before the dehumidification process and after. It allows lower supply air temperature and humidity ratios to be obtained [10]. The proposed system consists of a combination of two indirect evaporative air coolers combined with a desiccant wheel (see Fig.…”

Section: Proposed System Descriptionmentioning

confidence: 99%

Analysis of the multi-stage desiccant cooling system performance in Wrocław (Poland)

et al. 2019

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In this study, the application potential of desiccant cooling system with indirect evaporative precooling is analyzed for moderate climatic conditions. Wrocław (Poland) was selected as a representative city. On the base of summer season weather parameters different system running modes were proposed such as cooling and dehumidification mode (Mode 1) and only cooling mode (Mode 2). The average month Thermal and Electrical COP were established for selected climatic conditions. It was concluded that proposed system allows to cool the air without occurrence of condensation in Mode 2 with high average monthly electrical COP (COPel = 62.2 in August). On the other hand when dehumidification is needed, system operates in Mode 1 and obtains relatively high average Thermal COP values (COPth = 2.2).

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“…A typical wheel can be spited into different process to regeneration air (R/G) ratio namely 50:50, 75:25 etc. split between dehumidification and regeneration area [20][21][22][23][24][25]. Page: 20 www.raftpubs.com According to investigations conducted by Henning [15], this configuration is suitable for the temperate climate ambient conditions only.…”

Section: System Descriptionmentioning

confidence: 99%

An overview on use of desiccant dehumidifiers in modern air-conditioning

2019

Open J Archit Eng

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The solid desiccant based dehumidifier used in conjunction with the conventional HVAC combines the dehumidification of solid desiccant system and with the cooling capacity of the conventional air conditioning system. This hybrid cooling system provides thermal comfort to the occupants of the conditioned space. The hybrid systems main appeal lies in the fact that, it consumes much lesser high grade electrical energy as compared to the dedicated standalone traditional air conditioning systems. The electrical energy usage is possible still lower by use of primary energy sources for to supply the thermal energy needed for the desiccant regeneration. For this purpose freely available renewable solar energy or industrial waste heat can also be used for the regeneration heat source. Sometimes it is also possible to provide condenser waste heat for the part of desiccant reactivation heat supply may increase the overall performance of the system. It was also found that this cooling system with use of air to air waste heat recovery wheel performed better than without it in terms of dehumidification as well as cooling performance. The present study report important literature survey on the dehumidification potentials of desiccant integrated hybrid cooling system operating in hot and humid climates. Keywords: Hybrid air-conditioning; Rotary desiccant dehumidifier; Heat recovery wheel; Regeneration heat; Renewable solar energy; Waste heat

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Multi-stage desiccant cooling system for moderate climate

Cited by 33 publications

References 28 publications

Dehumidification Potential of a Solid Desiccant Based Evaporative Cooling System with an Enthalpy Exchanger Operating in Subtropical and Tropical Climates

Dehumidification Potential of a Solid Desiccant Based Evaporative Cooling System with an Enthalpy Exchanger Operating in Subtropical and Tropical Climates

Analysis of the multi-stage desiccant cooling system performance in Wrocław (Poland)

An overview on use of desiccant dehumidifiers in modern air-conditioning

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