Electric Air PumpsR e s o u r c e s

Hello and welcome to our site on electric air pumps, we hope you’ll find what you are looking for while you are here. A pump is a device that is specifically designed to move fluids such as gases, liquids or slurries. A pump is able to displace volumes through either mechanical or physical actions. Pumps fall into five defining groups: displacement, direct lift, gravity, and buoyancy and velocity pumps. The name of pump describes its method of moving the fluids.

Progressing cavity pump

These electric air pumps are typically used for shifting difficult materials such as sludge from sewage that is contaminated by large particles; these pumps are engineered with a rotor that is helical shaped which is around 10 times long at its width. As the shaft of these pumps begins to rotate, fluid is progressively forced up the rubber sleeve. These pumps have the ability to develop high levels of pressure at fairly low levels of volume.

Texsport Electric Air Pumps

These electric air pumps by Texsport are designed to inflate and deflate air mattresses, inflatable boats and a host of other items. For camping and other outdoor activities, this air pump comes with a rugged plastic case. Texsport electric air pump features three nozzle adapters which can be powered by a 12 volt car cigarette lighter or 120 volt AC wall outlet.

Intex Electric Air Pumps

These electric air pumps by Intex allows you to deflate and inflate items easily. This pump is both compact and small making it ideal for both storage and travelling. When you purchase this pump tyou also receive a 12 volt in car charger, but not a mains charger. This pump is most ideal for boasts, pools and other inflatable items.

Vango DC Air Pump

The Vango DC electric pump is ideal for both deflation and inflation of virtually every inflatable item on the market today. This product is perfect for home and camp use, the Vango DC electric air pump can have your standard size air bed inflated within five minutes and with the nozzle attachments that it comes with, in three different sizes, it can fit almost every product out today.

Draper 77579 Electric Air Pumps

This electric air pump the draper 77579 is ideal for both deflating and inflating air beds, boats, lilos and inflatable kid’s toys. These electric pumps come with adaptor nozzles in three sizes for the different valves and a car cigarette type plug and 1.6 metres of cable.

Tweet This Post

Earth sheltering

Background

Living within earth shelters has been a large part of human history. The connection to earth shelter dwellings began with the utilization of caves, and over time evolving technologies led to the construction of customized earth dwellings. Today, earth shelter construction is a rare practice, especially in the U.S.A. During the energy crisis and the 1973 Oil Crisis, along with the back-to-the-land movement, there was a surge of interest in earth shelter/underground home construction in an effort toward self-sufficient living. However, progress has been slow, and earth shelter construction is often viewed by architects, engineers, and the public alike as an unconventional method of building. Techniques of earth sheltering have not yet become common knowledge, and much of society still remains unaware of the process or benefits of this type of building construction.

Types of construction

Earth berming: Earth is piled up against exterior walls and packed, sloping down away from the house. The roof may, or may not be, fully earth covered, and windows/openings may occur on one or more sides of the shelter. Due to the building being above ground, fewer moisture problems are associated with earth berming in comparison to underground/fully recessed construction.

In-hill construction: The house is set into a slope or hillside. The most practical application is using a hill facing towards the equator (south in the Northern Hemisphere and north in the Southern Hemisphere). There is only one exposed wall in this type of earth sheltering, the wall facing out of the hill, all other walls are embedded within the earth/hill.

Underground/fully recessed construction: The ground is excavated, and the house is set in below grade. It can also be referred to as an Atrium style due to the common atrium/courtyard constructed in the middle of the shelter to provide adequate light and ventilation.

Benefits

The benefits of earth sheltering are numerous. They include: taking advantage of the earth as a thermal mass, offering extra protection from the natural elements, energy savings, providing substantial privacy, efficient use of land in urban settings, shelters have low maintenance requirements, and earth sheltering commonly takes advantage of passive solar building design.

The Earth’s mass absorbs and retains heat. Over time, this heat is released to surrounding areas, such as an earth shelter. Because of the high density of the earth, change in the earth temperature occurs slowly. This is known as hermal lag. Because of this principle, the earth provides a fairly constant temperature for the underground shelters, even when the outdoor temperature undergoes great fluctuation. In most of the United States, the average temperature of the earth once below the frost line is between 55 and 57 degrees Fahrenheit (13 to 14 degrees Celsius). Frost line depths vary from region to region. In the USA frost lines can range from roughly 20 inches to more than 40 inches. Thus, at the base of a deep earth berm, the house is heated against an exterior temperature gradient of perhaps ten to fifteen degrees, instead of against a steeper temperature grade where air is on the outside of the wall instead of earth. During the summer, the temperature gradient helps to cool the house.

The reduction of air infiltration within an earth shelter can be highly profitable. Because three walls of the structure

Tweet This Post