The retention and drainage of water on heat exchangers is extremely important in air-conditioning, refrigeration, and heat-pumping systems. In this work, droplets of varying sizes sliding on an inclined heat exchanger materials with and without a wettability gradient are observed using a high-speed camera. The dynamic contact angles, the shape evolution and the velocity of the droplet are obtai...

The aim of this study was to evaluate the effects of vitamin E associated with rapid thawing on cryopreserved goat semen. Two bucks were used and eight ejaculates per animal were collected using artificial vagina. Semen was diluted with the following treatments: BIOXCELL (control), BIOXCELL + Equex (sodium lauryl sulphate) and BIOXCELL + vitamin E 100 μM. Semen was packaged into 0.25 mL straws ...

Background. Legume seeds, including beans, are a good source of mineral constituents. The level of these compounds depends among other factors, on the species, cultivar and the methods of processing applied. However, there are no studies in the literature which deal with the content of mineral constituents in physiologically immature bean seeds. Material and methods. The aim of this study was t...

Street food sales are a common business practice in most South African cities. It is held by young people whose age varies between 20 and 40 years with experience of 6 to 10 for the part. Poultry meat was best-selling ahead beef goat meat. These resellers drew information on preservation from their colleagues freezing widely used way lengthen life or avoid losses. Changes color odor were main s...

In wood processing, is exposed to an environmental temperature of less than 0 °C for some time, which mainly occurs during the air drying in winter months, or when lumber stored piles outdoors before kiln process. these cases, freezing process increases degree wood, subsequently significantly affecting its heating further processing (for example, cutting process). The most common method by humi...

The threat of the global warming is alarming. The increase in oil prices remains a persistent worry and today’s energy challenges are truly critical. In this context, heat pumps in the residential sector appear to be an interesting solution to reduce energy consumption and emissions of greenhouse gases. The French government has developed, under the leadership of the “Grenelle of the environmen...

Nowadays Heat pump water heater becomes a very hot topic in hot water industry. However it has many problems because of higher condensing temperature and large-scale operation conditions. Based on the problems, this paper presents a prototype which was assembled using a rotary compressor with refrigerant injection port. By making use of the liquid injection function of the compressor, the syste...

Among all available solar technologies, solar-assisted heat pump (SAHP) is the most popular technology for low- and medium-temperature applications, i.e., drying, space heating, water heating. This paper presents a critical review of SAHP, leading to identification key technological challenges with current SAHP technology, including (1) poor energy performance at low ambient temperatures; (2) d...