Air curtain is a widely used heat insulation equipment in the market, which reduces exchange efficiency of both sides by air surface formed jet. In order to reduce use electric heating device curtain, new designed coupling experiment source pump and heating. The fan preheated condenser pump, so as dependence on parts, save energy consumption.

Recently, it has been discovered that heat pump drying is an efficient method of drying for drying industries. Heat pumps deliver more heat during the drying process than the work input to the compressor. Heat pump drying is a more advanced method than the traditional South African industrial and agricultural drying methods, such as direct/indirect sunlight, wood burning, fossil fuel burning, e...

Thermodynamics originated with the study of heat engines. A precursor to heat engines, the vacuum pump, was designed by the German scientist Otto von Guericke who, in 1650, created the world’s first ever vacuum in what are known as the Magdeburg hemispheres. He was driven to make a vacuum in order to disprove Aristotle’s long-held supposition that “Nature abhors a vacuum”. Shortly thereafter, I...

Air source heat pumps are widely used for residential heating because of their relatively low installation costs. Major disadvantages are that the heat output and COP decrease and the discharge temperature of the compressor increases as the outdoor temperature decreases. All of these factors usually lead to the need of combined heat pump and backup heating systems, which increases the cost and ...

UNLABELLED Syringe pumps are commonly used to administer therapeutic (131)I-metaiodobenzylguanidine. Here we describe our recent experience with a peristaltic infusion pump system in a pediatric setting. This method can easily accommodate infusions from several vials simultaneously and is adaptable to various types of peristaltic pump. METHODS Simple off-the-shelf components are used to vent ...

Holey fibers (HF) with their peculiar properties have been used in fabrication of Erbium doped holey fiber amplifiers (EDHFA) for third optical communication window. In this paper, by using scalar effective index method, the analyses are presented to investigate the effects of HF geometrical parameters on the gain performance of the EDHFAs. The hierarchical variations of the parameters, includi...

In this paper, an economic study of solar heat pumps and an investigation of differences between solar heat pumps and conventional heat pumps—based on their performances and energy consumption—are conducted for a residential apartment located in Austin, Texas, USA. Heating in the apartment is provided via a solar heat pump during the cold months of a year. Solar collectors are used to meet the ...