Photocatalytic reforming of carboxylic acids on cocatalyst-loaded semiconductors is an attractive process for H2 generation that has been studied for years. Experimental support for the surface reaction mechanisms, nevertheless, is still insufficient. Herein, the mechanism of the photocatalytic conversion of oxalic acid in anaerobic conditions together with the total yields have been deeply investigated by

A comprehensive energy and exergoeconomic analysis of a novel transcritical refrigeration cycle (NTRC) is presented. A second ejector is introduced into the conventional refrigeration system for the utilization of the gas-cooler waste heat. The thermodynamic properties of the working fluid are estimated by the database of REFPROP 9, and a FORTRAN program is used to

This study experimentally investigates the performance of an indirect evaporative cooling fresh air-handling unit at different modes of operation under harsh climatic conditions experienced in Qatar. Temperature and relative humidity are measured at various points within the fresh air handling unit for each mode of operation and, the measured data are stored and analyzed. Cooling

An experimental investigation of the performance of a direct-indirect evaporative cooling fresh air handling unit with different modes of operation is presented. Linear regression analysis is used to fit the experimental results, and the correlation coefficient is evaluated. It is found that the highest temperature reduction of 18.8°C is achieved across the heat exchanger for

An experimental investigation of the performance of a fresh air handling unit integrating indirect evaporative and vapor compression cooling is conducted. Temperature and relative humidity measurements at main points within the cooling unit were logged using a wireless data acquisition system. Experimental data downloaded from the acquisition system is used for linear regression analysis, and

Calcium sulfoaluminate cements are widely used as special cements and, because of their low specific carbon dioxide emissions relative to those of Portland cement, they have potential for use in general construction. However, their widespread application has been limited by the relatively high cost of aluminous raw materials. As part of a broad programme on

In the context of the decarbonisation of the building sector, this work focuses on the process economics of a carbon capture and utilization alternative for the production of a novel construction material based on magnesium carbonate trihydrate, also known as nesquehonite. This material, after a dehydration-rehydration process, can be conformed into moulds with a significant

The present paper describes the impact of floriculture on socio-economic development of the rural communities inhabited in the Himalayan Mountains. Rural and traditional societies are interested and many are involved in floriculture business for supplementing their livelihood for sustainability in the region. Keeping this in view, two varieties of potential flowers viz. Gladiolus and Lilium

Evaporative cooling can be integrated into fresh-air-handling units, to reduce cooling demand. This study considers a hybrid fresh-air-handling unit which incorporates a vapor-compression cooling cycle and indirect evaporative cooling to condition an ambient primary airstream to a desired supply air state. The cooling eects of using various modes (vapor compression only; direct expansion with mist;

Qatar has very limited freshwater resources. This paper assesses the sustainability implications of using bore water and treated sewage effluent (TSE) for residential water supply (for non-drinking purposes) in a residential compound in Doha, Qatar. The treated bore water was considered for non-drinking domestic applications in kitchens and bathrooms, while the TSE was considered for

Engineering of effective photocatalytically active structures is of great importance as it introduces a solution for some existing air pollution problems. This can be practically achieved through the bonding of particulate photocatalysts to the surface of construction materials, such as aggregates, with a suitable stable binding agent. However, the accessibility of the photocatalytically active materials

This paper presents the environmental and economic benefits from the use of potable water from a desalination plant, and treated sewage effluent (TSE) for non-potable reuse, in Lusail, Doha. This newly built city plans to use TSE for a large portion (98 %) of its non-domestic applications instead of discharging TSE to the ocean. It

Qatar has a dry, subtropical desert climate, with minimum annual rainfall and intensely hot and humid summers. Using indigenous grass, those adapted to local conditions have the potential to be used for fodder and can also be used for restoration or rehabilitation of degraded rangelands. Chloris virgata, Coelachyrum brevifolium and Cenchrus ciliaris bloom twice a

Magnesium carbonate trihydrate, nesquehonite, is proposed as a precursor for the production of a construction material similar to plasterboard, in a unique carbon capture and utilisation process [1]. The hardening process is thought to follow a similar mechanism to gypsum in the manufacture of plasterboard, where the hardening is produced in the recrystallization of gypsum

Carbon capture and utilisation processes, CCU, are those processes aiming to produce usable products from CO2-based materials. Although there are a large number of CCU alternatives, only a few are able to propose routes for the massive production of marketable CO2 based products with a negative or neutral carbon footprint in the long term. In

Launaea nudicaulis (Asteraceae) produces two morphologically distinct types of achenes (whitish brown and black) in a single capitulum. All L. nudicaulis achenes have a pappus and pappi were removed artificially in this study for experimental purposes. The germination of achenes of both colours, with and without pappi, under various temperature regimes and illumination conditions was