Abstract
In recent years, hot and cold storage systems demonstrated themselves to be key components, especially in systems for waste heat exploitation. Moreover, mobile A/C and refrigeration set new efficiency challenges in the field of goods and passengers transport. In such a context, adsorption cold storage devices enable new possibilities and show promising features: high energy density and the possibility of being operated both for heat and cold release to the user. However, only a few studies on small and compact systems for mobile applications have been carried out so far, especially for cold storage exploiting low-temperature sources (<100 °C). The present paper describes the realization and testing of two different types of cold storage based on two innovative adsorbent reactors: a pelletized adsorber filled with commercial FAM Z02 zeolite, and a composite adsorber based on an aluminum porous structure and a SAPO-34 coating. An already developed testing procedure was employed to characterize the prototypes under cold storage mode for mobile refrigeration purposes. The test clearly showed that prototypes can store up to 580 Wh, with an average power during the discharging phase that ranges from 200 W to 820 W and an energy efficiency of 0.3 Whdischarged/Whcharged for the operations in the selected conditions, thus revealing promising opportunities for future further developments.
Highlights
The use of renewable energy sources and waste energy is an important task in order to fulfill the newest energy demands [1], especially for heating/cooling and refrigeration purposes, for stationary applications and for mobile uses.Nowadays, mobile A/C and refrigeration are solely based on vapor compression systems, wherein the compressor is mechanically driven by the vehicle engine
The present paper describes the experimental testing of two different types of cold storage for mobile refrigeration applications based on two innovative adsorbent reactors: a pelletized adsorber filled with commercial FAM Z02 zeolite, and a composite adsorber based on an aluminum, porous structure and a SAPO-34 coating
Whileisthe vehiclethe is heat taken from the engine-cooling loop is used to the cold storage system located near the running, the heat taken from the engine-cooling loop is used to “recharge” the cold storage system refrigerated a stop, when thea internal combustion engine is no longer able to located near compartment
Summary
The use of renewable energy sources and waste energy is an important task in order to fulfill the newest energy demands [1], especially for heating/cooling and refrigeration purposes, for stationary applications (residential and industrial buildings) and for mobile uses.Nowadays, mobile A/C and refrigeration are solely based on vapor compression systems, wherein the compressor is mechanically driven by the vehicle engine. It is subjected to a phase-out, the most used refrigerant is still HFC-134a, with a global warming potential (GWP) of 1300: if services and end-of-life are considered, it results in equivalent CO2 emissions in the range 15–37 g/km for a vehicle traveling 12,000 km/y [2,3]. Such an environmental impact, neglected by manufacturers and regulations, is equivalent to 16%–39% of the limits set by European emission standards for new passenger cars in 2020.
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