The process of gasification is well-known; however, to this day, the applications such facilities, especially off-grid small-scale units for direct electricity and char production, are scarce. In study, an fixed bed downdraft unit studied from gaseous/solid product character perspective. This represents a possible solution emerging call sustainable decentralised energy sources. Softwood chips were utilised in their conversion into synthetic gas (direct supply) solid biochar was observed...

Energy efficiency is one of the most important topics nowadays. It strictly related to energy demand, policy, environmental pollution, and economic issues. can be increased operating costs reduced by using waste heat from other processes. One possibilities use sorption chillers produce chilled water desalinated water. Low-temperature not easy utilize because low potential. Using adsorption in low-temperature conditions allows utilizing producing useful products many regions world. The paper...

Since the adsorption chillers do not use primary energy as driving source possibility to employ low temperature waste heat sources in cooling production receives nowadays much attention of industry and science community. However, performance thermally driven systems is lower than that other heating/cooling systems. Low coefficients are one main disadvantages coolers. It result a poor transfer coefficient between bed immersed heating surfaces built-in exchanger system. The purpose this work...

Abstract Energy efficiency is one of the most important topics nowadays. It strictly related to problem energy demand, policy, environmental pollution, and economic issues. Because technological development, using more advanced processes in almost every part industry increasing demands both for a high standard living simplification processes, demand growing. This can be observed, e.g., building sector—air conditioning present new people expect quality thermal conditions. At same time, many...

Adsorption cooling and desalination technologies have recently received more attention.Adsorption chillers, using eco-friendly refrigerants, provide promising abilities for low-grade waste heat recovery utilization, especially renewable of the near ambient temperature.However, due to low coefficient performance (COP) capacity (CC) they not been widely commercialized.Although operating in combined heating (HC) systems, adsorption chillers allow efficient conversion management sources thermal...

Adsorption chillers are distinguished by their low electricity consumption, lack of moving parts and exceptional reliability. However, considerable weight, due to the sorption capacity conventional adsorbents, remains a key limitation. This study investigates effect introducing thermally conductive additives—aluminium powder, copper powder graphite flakes—at 5, 15 25 wt.% silica-gel-based adsorbent beds on enhancement heat transfer. In contrast other works, this also includes novel analysis...

A distinct advantage of adsorption chillers is their ability to be driven by heat near ambient temperature. However the performance thermally systems lower than that other heating/cooling systems. It result a poor transfer coefficient between bed and immersed heating surfaces built-in exchanger system. The aim this work study effect thermal conductance values as well design parameters on re-heat two-stage chiller. One main energy efficiency factors in cooling production, i.e. capacity (CC)...

Many attempts are made worldwide to create cheap, efficient, and eco-friendly water desalination systems. Passive solar stills (SS) considered be such. This paper presents the results of experimental theoretical investigation effects using phase-change materials (PCM) on performance SS. The experiments were conducted for two paraffin waxes, as PCM 1.0, 2.5, 5.0 kg used. studies used validate a mathematical model, which was based energy balance ordinary differential equations. equations...

Adsorption chillers can be a promising part of sustainable development concept the global economy due to utilization low grade thermal energy sources for cooling production. Therefore, research aiming at improving their performance i.e. Coefficient Performance (COP) by optimizing heat and mass transfer condition in adsorption beds are crucial. Innovative modification sorbent layer structure proposed paper order improve characteristics exchanger boundary layer. The analysis desorption...

Important parameters used for adsorption chillers, e.g. cooling capacity, coefficient of performance, are strictly dependent on heat and mass transfer conditions between adsorbent the cooling/heating medium. With aim energy efficiency increasing it is essential to reduce resistance. Different bed configurations exchangers constructions recommended application. In paper review commonly configurations, i.e. loose-grain beds or fixed beds, presented. Also, different technology were described....

The article presents experimental results of the metal-based and carbon nanotube additives influence on sorption kinetics a silica-gel-based adsorption bed in an chiller. purpose doping is to improve efficiency processes within by use metallic non-metallic characterized higher thermal diffusivity than basic material. conductivity bed, faster take place, which directly translates into greater refrigerator. In this study, pure silica gel sorbent doped with given amount aluminum (Al) copper...

Adsorption chillers are characterized by low electricity consumption, lack of moving parts, and high reliability. The disadvantage these is their large weight due to adsorbent sorption capacity. Therefore, the attention turned finding a sorbent with water capacity enhanced thermal conductivity increase chiller efficiency. article discusses impact selected adhesives used for production an adsorption bed in order improve heat exchange on its surface. Experiments silica gel three commercial...

Thermochemical conversion of biomass waste is a high potential option for increasing usage renewable energy sources and transferring wastes into the circular economy. This work focuses on evaluation energetic adsorption properties solid residue (char) gasification process. Gasification experiments (wheat straw, hay pine sawdust) were carried out in vertical fixed bed reactor, under CO2 atmosphere at various temperatures (800, 900 1000 °C). The analysis obtained chars included elemental...

Forecasts to 2030 indicate that demand for electricity will increase from 2% 3% per year, and due the observed high rate of development world economy, energy continue increase. More efficient use primary has influence on reduction emissions consumption fuel. Besides, reducing amount fuel burned, it reveals a beneficial effect environment. Since extraction-back pressure turbines have some limitations, including restriction production limited heat in summer. The paper discusses possibilities...

Broadly defined climate protection is a powerful incentive in the search for environmentally friendly refrigeration technologies. Adsorption chillers are considered to be one such technology; however, their main disadvantages include low cooling capacity, energy efficiency ratio (EER), and cyclic operation. Thus, great deal of effort being put into improving adsorption-chiller performance. In this paper, influence spray angle, number nozzles, water flow rate through nozzles on performance...

Adsorption systems are alternatives to compressor cooling systems. Apart from many advantages, these characterized by low COP and SCP parameters. One of the most promising options improve performance adsorption chillers is replacement stationary bed with a fluidized one. A significantly increases heat mass transfer within bed, enables better contact between gas solid phases, results in proper mixing adsorbent particles. This paper presents possibility using beds chillers. shows CFD numerical...

Environmental and economic factors have a very strong impact on technological development. Energy efficiency is one of the most important topics associated with new technologies their improvements. Increasing restrictions are being imposed energy consumption pollutant emissions in many countries, especially European Union. At same time, whole sector facing rapidly growing cooling demands. A system based sorption processes may be an interesting alternative, adsorption chillers which can...

Due to a high risk of power outages, heat-driven adsorption chillers are gaining the attention. To increase efficiency chiller, new adsorbents must be produced and examined. In this study, four newly developed silica–based porous materials were tested compared with silica gel, an adsorber commonly paired water. Extended sorption tests using mercury intrusion porosimetry, gas adsorption, dynamic vapor performed. The morphology samples was determined scanning electron microscope. thermal...

Adsorption chillers produce cold energy, using heat instead of electricity, thus reducing electrical energy consumption. A major industrial waste, fly ash, can be converted to zeolite and used in adsorption as an adsorbent. In this research, three different types zeolites were synthesised from ash via a hydrothermal reaction alkaline solution (NaOH). The obtained samples (Na-A zeolites) modified with K2CO3 increase the water capacity these samples. Phase morphology analyses shows that...

Passive solar distillation is cheap and energy-efficient technology but its main disadvantage low productivity. Thus, there are many attempts to improve stills’ productivity, one of them changing the mass water. This paper presents results validation thermal processes modeling in a still (SS). In order validate model, experimental studies were conducted laboratory ensure uniform climatic conditions. The carried out for 10 kg, 15 20 kg water under three different irradiance show that highest...

Waste heat utilisation and its reclamation is important for increasing the efficiency of electric power production decreased consumption primary energy. can be utilised or manufacturing processing purposes. According to long-term forecasts, with current about 150 TWh, increased 230 TWh in around 2040, what may lead energy from fuels emission harmful contaminants atmosphere. The cement subsector, next glass industry, among most power-consuming industries, it consumes 12-15% total consumed by...