Building thermal load management through integration of solar assisted absorption and desiccant air conditioning systems: A model-based simulation-optimization approach

Salarian

2021

IJETS

In the past decades, desiccant cooling systems have received much attention. These systems are considered as an alternative way to decrease energy consumption and greenhouse gas emission in humid and hot locations. To address the importance of desiccant air-conditioning systems, the present research aims to provide an overview of recent studies on the development of desiccant air conditioning system. Another objective is to consider the numerical and theoretical analysis of desiccant systems. Moreover, for the first time, a summary of recent researches regarding the use of Computational Fluid Dynamics (CFD) technique for numerical modeling of desiccant cooling systems has been especially reviewed in detail. Finally, in the present review, the principle of regeneration of liquid desiccant using solar energy have also been considered briefly.

Section: Regeneration Of Liquid Desiccant Using Solar Energymentioning

confidence: 99%

An Overview of Recent Studies on the Development of Desiccant Air-conditioning Systems

Salarian

2021

IJETS

“…One of the best approaches to assess device output under load variations during the initial design stages is to use modelbased simulation and optimisation [37]. For example, for a standalone absorption device, the optimised solar fraction is 57.50 per cent, and the thermal COP is 0.55, while for an integrated absorption desiccant system (IADS), the solar fraction is 56.20 per cent, and the thermal COP is 1.52.…”

Section: Application Of Desiccant In Air-conditioning Systemmentioning

confidence: 99%

Review of Desiccant in the Drying and Air-Conditioning Application

Ramli¹,

Misha²,

Haminudin³

et al. 2021

IJHT

Desiccant is a hygroscopic substance generally used in the dryer and air-conditioning system as a drying agent. The function of desiccant is to remove moisture from the air to reduce the humidity of the surrounding air been conditioned. This paper presents several works on the performance of desiccant material in the drying and air-conditioning application. It puts focus on the various advantages and disadvantages of the use of desiccant as a drying agent. There are some advantages of using desiccant include consistent drying and low energy usage. However, there are several disadvantages of using desiccants which are low capacity for moisture absorption and pressure drop in solid desiccant. Solar drying applications have some advantages such as being comparatively cheaper than other methods and less risk of spoiling the product. On the contrary, drying applications have disadvantages include being lower in comparison to the original foodstuff and drying foods eventually leads to shrinkage. The advantages of using desiccant in air-conditioning applications offer dehumidified fresh air to keep the building's temperature in a comfortable range and enhances water recovery efficiency. There are disadvantages such as desiccant will substantially impact the system's performance and desiccant should be cooled after completely dried.

“…However, the numerical methods to investigate solar energy for cold storage are limited and not well explored in the literature. Existing literature has predominantly focused on solar energy for space cooling applications, typically designed for positive temperature ranges [3,4]. In contrast, cold storage necessitates sub-zero temperatures, ranging from -10 to -60 o C, contingent upon the specific product being stored.…”

Section: Introductionmentioning

confidence: 99%

Numerical model of solar-driven cold storage for small-scale fisheries

Mehmood,

Usman,

Santika

et al. 2024

Preprint

The need for cold storage is growing worldwide, especially for small-scale fisheries in tropical coastal regions where access to a continuous power supply and modern preservation methods is limited or nonexistent. This deficiency in adequate storage facilities significantly diminishes their catch quality. Novel renewable, gridindependent solutions are required to address this problem. This study proposes and demonstrates a solardriven grid-independent cold storage unit through a dynamic model developed in TRNSYS simulation software. A detailed parametric study highlights the critical parameters for optimal sizing related to cold storage insulation, sizing of air conditioning systems, and photo-voltaic battery systems. Moreover, the optimal integration was compared with conventional (gridbased) cooling solutions for cold storage. The results show that grid-independent cold storage of 20 feet to store 1,285 kg of fish daily at -20°C requires 24.5 kW of PV array, 10 kW inverter and a battery storage of 151296 Wh to meet the annual electricity demand of 32.3 MWh. The parametric analysis shows that insulation of 150mm reduces thermal energy demand for cooling by 12.3% (from 74 MWh to 64.9 MWh), and a further increase in insulation does not provide significant benefits. The analysis shows how the cooling rate influences the sizing of the HVAC system, how the collector tilt angle adjustment frequency impacts PV performance, and how the battery backup time influences the battery size. The proposed system can save 23.3 tons of carbon emissions annually compared to grid-connected conventional cold storage. The paper discusses the design and implementation of the PV-driven grid-independent vapour compression cooling system, highlighting key influence design parameters, control strategies, and energy management techniques to minimise excessive cooling in the cold storage freezer room.