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Where interior design is concerned, it is an unfortunate fact that children respond positively to bright and primary colors whereas; adults have a preference for a more sophisticated palette. What we are aboutOur mission is to help people visualize, create & maintain beautiful homes.
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A - In a "close-coupled" SWH system the storage tank is horizontally mounted immediately above the solar collectors on the roof. In order to heat water using solar energy, a collector, often fastened to a roof or a wall facing the sun, heats working fluid that is either pumped (active system) or driven by natural convection (passive system) through it. The heat transfer fluid (HTF) for the absorber may be the hot water from the tank, but more commonly (at least in active systems) is a separate loop of fluid containing anti-freeze and a corrosion inhibitor which delivers heat to the tank through a heat exchanger (commonly a coil of copper heat exchanger tubing within the tank).
Residential solar thermal installations fall into two groups: passive (sometimes called "compact") and active (sometimes called "pumped") systems. When a solar water heating and hot-water central heating system are used in conjunction, solar heat will either be concentrated in a pre-heating tank that feeds into the tank heated by the central heating, or the solar heat exchanger will replace the lower heating element and the upper element will remain in place to provide for any heating that solar cannot provide. The best examples of solar heating in use are in Israel and Cyprus, being the per capita leaders in the use of solar water heating systems with over 30%–40% of homes using them. Until the advent of freeze-tolerant solar collectors, they were not considered suitable for cold climates since, in the event of the collector being damaged by a freeze, pressurized water lines will force water to gush from the freeze-damaged collector until the problem is noticed and rectified. Indirect or closed loop systems use a heat exchanger that separates the potable water from the fluid, known as the "heat-transfer fluid" (HTF), that circulates through the collector.
Passive systems rely on heat-driven convection or heat pipes to circulate water or heating fluid in the system.
Modern active solar water systems have electronic controllers that offer a wide range of functionality, such as the modification of settings that control the system, interaction with a backup electric or gas-driven water heater, calculation and logging of the energy saved by a SWH system, safety functions, remote access, and various informative displays, such as temperature readings. The most popular pump controller is a differential controller that senses temperature differences between water leaving the solar collector and the water in the storage tank near the heat exchanger.
Some active SWH systems use energy obtained by a small photovoltaic (PV) panel to power one or more variable-speed DC pump(s). An active solar water heating system can also be equipped with a bubble pump (also known as geyser pump) instead of an electric pump.
An integrated collector storage (ICS or Batch Heater) system uses a tank that acts as both storage and solar collector. A convection heat storage unit (CHS) system is similar to an ICS system, except the storage tank and collector are physically separated and transfer between the two is driven by convection. Any hot object ultimately returns to thermal equilibrium with its environment, due to heat loss from the hot object. Heat is lost more rapidly if the temperature difference between a hot object and its environment is larger. The most simple approach to solar heating of water is to simply mount a metal tank filled with water in a sunny place. ICS or batch collectors reduce heat loss by placing the water tank in a thermally insulated box. Unglazed or formed collectors are similar to flat-plate collectors, except they are not thermally insulated nor physically protected by a glass panel. Evacuated tube collectors (ETC) are a way in which heat loss to the environment, inherent in flat plates, has been reduced.
The amount of heat delivered by a solar water heating system depends primarily on the amount of heat delivered by the sun at a particular place (the insolation). Below is a table that gives a rough indication of the specifications and energy that could be expected from a solar water heating system involving some 2 m2 of absorber area of the collector, demonstrating two evacuated tube and three flat plate solar water heating systems. With most solar water heating systems, the energy output scales linearly with the surface area of the absorbers. In sunny, warm locations, where freeze protection is not necessary, an ICS (batch type) solar water heater can be extremely cost effective. When calculating the total cost to own and operate, a proper analysis will consider that solar energy is free, thus greatly reducing the operating costs, whereas other energy sources, such as gas and electricity, can be quite expensive over time.
The calculation of long term cost and payback period for a household SWH system depends on a number of factors.
Solar leasing is now available in Spain for solar water heating systems from Pretasol with a typical system costing around 59 euros and rising to 99 euros per month for a system that would provide sufficient hot water for a typical family home of six persons. Australia has instituted a system of Renewable Energy Credits, based on national renewable energy targets.
EN 806: Specifications for installations inside buildings conveying water for human consumption. EN 1717: Protection against pollution of potable water in water installations and general requerements of devices to prevent pollution by backflow. People have begun building their own (small-scale) solar water heating systems from scratch or buying kits. Payments for householders over seven years for each kWh of heat produced for the expected lifetime of the renewable technology and based on deemed heat usage.
The UK government has also confirmed that people who have installed equipment under RHPP 1 or 2 will be eligible for support through the RHI providing they meet the eligibility criteria of the full RHI scheme. Most shooters can think of at least one convenient place they would like to conceal a handgun in their home or business, but there's not a practical way to do so.
Leatherman knows their customers are looking for quality multitools for a variety of tasks. At first glance, the wide variety of Sticky Holsters appears to be a new set of top-notch pocket rigs. Regular practice is the key to maintaining critical defensive pistol skills, but it's not always convenient to make the time to go to the shooting range. Recent developments in synthetic lubricant technology have generated products with higher levels of heat resistance, increased lubricity and reduced levels of carbon buildup. GunVault continues to expand their line of biometrically-operated handgun safes with the new SpeedVault SVB 500. Momentoitalia - Italian furniture design and lifestyle - Italian modern wall units, entertainment modern wall units and tv units furniture.
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Playrooms have, in the past, been associated with garishness and mess but a commitment to clever storage and a carefully chosen theme can turn a playroom into a realm of fantasy for children and a magical family escape for adults. Pirates and the high seas prove a popular choice with young boys and girls alike but trends, by nature, are fleeting and even more so when dictated by the whims of children. We bring to you inspiring visuals of cool homes, specific spaces, architectural marvels and new design trends. Whether you live in a traditional or modern house, there are plenty of elegant ways below that can help you keep it clean without much effort. However, in winter there sometimes may not be sufficient solar heat gain to deliver sufficient hot water. The collector could be made of a simple glass-topped insulated box with a flat solar absorber made of sheet metal, attached to copper heat exchanger pipes and dark-colored, or a set of metal tubes surrounded by an evacuated (near vacuum) glass cylinder.
Copper is an important component in solar thermal heating and cooling systems because of its high heat conductivity, resistance to atmospheric and water corrosion, sealing and joining by soldering, and mechanical strength.
Both typically include an auxiliary energy source (electric heating element or connection to a gas or fuel oil central heating system) which is activated when the water in the tank falls below a minimum temperature setting such as 55 °C. However, the primary need for central heating is at night and in winter when solar gain is lower.
In the 1950s there was a fuel shortage in the new Israeli state, and the government forbade heating water between 10 pm and 6 am. Passive solar water heating systems cost less and have extremely low or no maintenance, but the efficiency of a passive system is significantly lower than that of an active system, and overheating and freezing are major concerns. In a typical active system, the controller turns the pump on when the water in the collector is about 8–10 °C warmer than the water in the tank, and it turns the pump off when the temperature difference approaches 3–5 °C. In order to ensure proper performance and longevity of the pump(s), the DC-pump and PV panel must be suitably matched.
A bubble pump circulates the heat transfer fluid (HTF) between collector and storage tank using solar power and without any external energy source and is suitable for flat panel as well as vacuum tube systems.
Batch heaters are basically thin rectilinear tanks with a glass side facing the position of the sun at noon. CHS systems typically use standard flat-plate type or evacuated tube collectors, and the storage tank must be located above the collectors for convection to work properly.
The efficiency of a solar thermal collector is directly related to heat losses from the collector surface (efficiency being defined as the proportion of heat energy that can be retained for a predefined period of time). Heat loss is predominantly governed by the thermal gradient between the temperature of the collector surface and the ambient temperature. However, this setup would be inefficient due to an oversight of the equilibrium effect, above: as soon as heating of the tank and water begins, the heat gained starts to be lost back into the environment, and this continues until the water in the tank reaches the ambient temperature.
This is achieved by encasing the water tank in a glass-topped box that allows heat from the sun to reach the water tank. Since the amount of heat that a tank can absorb from the sun is largely dependent on the surface of the tank directly exposed to the sun, it follows that a small surface would limit the degree to which the water can be heated by the sun.
Most flat plate collectors have two horizontal pipes at the top and bottom, called headers, and many smaller vertical pipes connecting them, called risers. Being tempered, the glass can withstand significant hail without breaking, which is one of the reasons that flat-plate collectors are considered the most durable collector type.
Since heat loss due to convection cannot cross a vacuum, it forms an efficient isolation mechanism to keep heat inside the collector pipes.
However, the energy output of flat plate collectors is reduced slightly more than evacuated tube collectors in cloudy or extremely cold conditions. Therefore, when comparing figures, take into account the absorber area of the collector because collectors with less absorber area yield less heat, even within the 2 m2 range. The efficiency of the collectors becomes lower if one demands water with a very high temperature.
In higher latitudes, there are often additional design requirements for cold weather, which add to system complexity.
Thus, when the initial costs of a solar system are properly financed and compared with energy costs, then in many cases the total monthly cost of solar heat can be less than other more conventional types of hot water heaters (also in conjunction with an existing hot water heater). It does not take into account annual maintenance costs, annual tax rebates and installation costs. Firstly, the payback period is shorter in countries with a large amount of insolation and even in parts of the same country with more insolation. Many SWH systems have a back-up electric heating element in the integrated tank, the operation of which may be necessary on cloudy days to ensure a reliable supply of hot water. If a large proportion of hot water in the reservoir is used each day, a large fraction of the water in the reservoir needs to be heated. This is because the price of a system is not linearly proportional to the size of the collector array, so the price per square meter of collector is cheaper in a larger system. The installation of efficient lagging significantly reduces the heat loss from the hot water system. To eliminate the risk of hot water in the storage tank from being cooled that way this is very important. Budgeting for a larger than required array of tubes therefore allows for the customisation of collector size to the needs of a particular application, especially in warmer climates. It's the underside of the shelves inside a gun safe that could be put to work with the right storage products. While they work very well for in-the-pocket carry, these holsters are designed to be used as in-the-waistband (IWB) holsters.
The only problem with spending a leisurely afternoon knocking over targets is the need to constantly set up new targets. There is a way to hone basic handgun skills using your actual handgun while saving money on ammunition and range fees.
The creators of Slipstream are ex-military men who were dissatisfied with the gun oils and greases they were issued in hot, sandy environments. Each piece of our modular wall unit system can be customized to your own taste to create modern compositions for your tv or modern wall units. Combine different elements, each in different sizes, pick your own color between several wood or lacquer finish and build your dream.
Starting from a single elements you can add up a series of pieces in different shapes and options to create unique personalized signature wall units. As shown: 12' feet length - 7'' feet height, with finishes eucalipto, matt finish bianco and matt finish mango. The space around the stairs can be turned into smart, built-in lockers for storing various objects. Copper is used both in receivers and primary circuits (pipes and heat exchangers for water tanks).
As soon as the pump shuts off, flow reverses and the pipes are empty before freezing could occur. Therefore, solar water heating for washing and bathing is often a better application than central heating because supply and demand are better matched.
Levi Yissar built the first prototype Israeli solar water heater and in 1953 he launched the NerYah Company, Israel's first commercial manufacturer of solar water heating. After being heated in the panels, the HTF travels to the heat exchanger, where its heat is transferred to the potable water. This ensures the water always gains heat from the collector when the pump operates and prevents the pump from cycling on and off too often. Some PV pumped solar thermal systems are of the antifreeze variety and some use freeze-tolerant solar collectors. In a bubble pump system, the closed HTF circuit is under reduced pressure, which causes the liquid to boil at low temperature as it is heated by the sun.
They are simple and less costly than plate and tube collectors, but they sometimes require extra bracing if installed on a roof (since they are heavy when filled with water [400–700 lbs],) suffer from significant heat loss at night since the side facing the sun is largely uninsulated, and are only suitable in moderate climates. The main benefit of a CHS systems over an ICS system is that heat loss is largely avoided since (1) the storage tank can be better insulated, and (2) since the panels are located below the storage tank, heat loss in the panels will not cause convection, as the cold water will prefer to stay at the lowest part of the system.
Within the context of a solar collector, convection and radiation are the most important sources of heat loss. The challenge is therefore to limit the heat loss from the tank, thus delaying the time when thermal equilibrium is regained. However, the other walls of the box are thermally insulated, reducing convection as well as radiation to the environment. Cylindrical objects such as the tank in an ICS collector inherently have a small surface-to-volume ratio and most modern collectors attempt to increase this ratio for efficient warming of the water in the tank. For pool heating applications, however, the water being heated is often colder than the ambient roof temperature, at which point the lack of thermal insulation allows additional heat to be drawn from the surrounding environment. Since two flat sheets of glass are normally not strong enough to withstand a vacuum, the vacuum is rather created between two concentric tubes.
Most ETCs are made out of annealed glass, which is susceptible to hail, breaking in roughly golf ball -sized hail.
Specifications for many complete solar water heating systems and separate solar collectors can be found at Internet site of the SRCC. This has the effect of increasing the initial cost (but not the life-cycle cost) of a solar water heating system, to a level much higher than a comparable hot water heater of the conventional type. However, the table does give an indication of the total cost and the order of magnitude of the payback period.
This is evident from the payback period less than 10 years in most southern hemisphere countries, listed above. This brings about significant fluctuations in water temperature every day, with possible risks of overheating or underheating, depending on the design of the system. If this is the case, it pays to use a system that covers nearly all of the domestic hot water needs, and not only a small fraction of the needs. Direct systems can be retrofitted to existing stores while indirect systems can be also sometimes be retrofitted using internal and external heat exchangers.
The installation of lagging on at least two meters of pipe on the cold water inlet of the storage tank reduces heat loss, as does the installation of a "geyser blanket" around the storage tank (if inside a roof). So arrays of sunny wall mounted steep collectors can sometimes produce more useful energy because there can be a small increase in winter gain at the expense of a large unused summer surplus. Gun Storage Solutions provides a variety of in-the-safe devices to help make room for more handguns.
StickimUp Handgun Magnets provide an affordable, easy to install solution that will securely hold a pistol in place. Along with the signature high-quality knife blades and pliers, you'll find a variety of implements that will come in handy when faced with an AR-15 malfunction in the field. The self-securing material of the holster uses the compression of the waistband against the body to securely retain both the holster and pistol without the need for bulky clips.
The problem is neatly and conveniently solved is a fun way with the Varmint Target, built in the USA by FabriMan. Slipstream blends nano particles of dry lubricant with a non-congealing, ultra-slick, synthetic carrier oil. The SpeedVault mounts to vertical surfaces, such as the interior of a desk or closet, in order to provide both instant access and secure handgun storage.
Each piece is available in wood in different wood finishes, in high gloss lacquer or matt lacquer in different colors. Composed by a series of storage elements, hanging cabinets in different sizes, base units, shelves and horizontal storage elements.
These modern wall unit system is top notch design and feature a wide selection of elements which can be combined, customized in sizes and finishes. The wall unit is enhanched by a wall modular composition made of storage and open elements with color and finishes combination. For your television needs, for your books, for your storage, there are hundreds of possibilities you can explore thanks to our modern wall unit system.
If you really have something good, we will publish it with your own name in our online magazine. In many climates, a solar hot water system can provide up to 85% of domestic hot water energy. Despite the abundance of sunlight in Israel, solar water heaters were used by only 20% of the population by 1967. Though slightly more expensive, indirect systems offer freeze protection and typically offer overheat protection as well.
There are many variations on this basic design, with some ICS collectors comprising several smaller water containers and even including evacuated glass tube technology, a type of ICS system known as an Evacuated Tube Batch (ETB) collector.
Typically, the water piping in an ETC is therefore surrounded by two concentric tubes of glass with a vacuum in between that admits heat from the sun (to heat the pipe) but which limits heat loss back to the environment. ETCs made from "coke glass," which has a green tint, are stronger and less likely to lose their vacuum, but efficiency is slightly reduced due to reduced transparency.
Many thermosiphon systems are quite efficient and have comparable energy output to equivalent active systems. The biggest single consideration is therefore the large initial financial outlay of solar water heating systems. This is partly because of good sunshine, allowing users in those countries to need smaller systems than in temperate areas.
DIY SWH systems are usually cheaper than commercial ones, and they are used both in the developed and developing world. Since the amount of heating that needs to take place every day is proportional to hot water usage and not to the size of the reservoir, it is desirable to have a fairly large reservoir (i.e. In cold climates the installation of lagging and insulation is often performed even in the absence of a SWH system. This powerful neodynium rare-earth magnet is rated to retain up to 14 pounds, and it really works.
These include a bolt override tool, a replaceable firearm disassembly punch and a replaceable carbon scraper, along with cleaning rod and brush adapters. The closed-end design keeps dust and lint out of the pistol and gun lubricants off of your clothing. This self-contained, bucket-shaped target system uses an internal battery-powered motor to reset an 8-inch by 4-inch yellow target each time the target is knocked down.
The dry particles are small enough to work themselves into the pores of a gun's metal components, and it can withstand much higher levels of heat and pressure than any liquid lubricant can. This modern wall composition is created by combining a series of different elements, in different sizes. Available in moder than 30 different lacquer finishes, matt or high gloss, in more than 10 different wood finishes.
This highly customizable wall unit is made available in more than 10 different finishes and 30 different matt lacquer colors.
Made of a series of elements including modern bases, horizontal long cabinets, square cabinets, shelves and tv panels.
Following the energy crisis in the 1970s, in 1980 the Israeli Knesset passed a law requiring the installation of solar water heaters in all new homes (except high towers with insufficient roof area). The system is designed such that the bubbles are separated from the hot fluid and condensed at the highest point in the circuit, after which the fluid flows downward towards the heat exchanger caused by the difference in fluid levels. This is actually a direct manifestation of the Second law of thermodynamics but we may term this the 'equilibrium effect'.
Serpentine flat plate collectors differ slightly from this "harp" design, and instead use a single pipe that travels up and down the collector. Even at the same latitude the average insolation can vary a great deal from location to location due to differences in local weather patterns and the amount of overcast. The efficiency of evacuated tube collectors is somewhat lower than for flat plate collectors because the absorbers are narrower than the tubes and the tubes have space between them, resulting in a significantly larger percentage of inactive overall collector area.
Unfortunately payback times can vary greatly due to regional sun, extra cost due to frost protection needs of collectors, household hot water use etc. Secondly, even in the northern hemisphere countries where payback periods are often longer than 10 years, solar water heating is financially extremely efficient. Vinyl-coated to protect gun barrels from dings and scratches, the Handgun Hanger will fit barrel bores as small as .22 caliber. The compact, no-mar black polymer housing is impervious to weather, which makes it reliable in a wide range of indoor and outdoor environments. Carry options using the ambidextrous Sticky Holsters can be expanded with the addition of modular ankle rigs, body armor straps, and more.
The front of the container is armored to resist stray .22 shots fired from 25-yards, but the container can be buried or sandbagged for added protection. This means if the carrier oil is burned off by excessive use, the Slipstream dry lubricant is still in place to keep parts moving smoothly. The provided bracket allows this safe to be mounted from the left, right or rear of the storage area.
Combination of modern storage cabinets, shelves, base units and tv panels will give space to hundreds of possibilities. Choose horizontal storage elements with folding doors, cabinets with wood or glass shelves, wall shelves and connecting pieces. Combine shelves with tv panesl, base elements, horizontal or vertical storage cabinets, shelves, square hanging cabinets and much more. Our modular wall unit system allow you to combine different elements at different sizes to create a composition which better fits your space.
Enjoy the photos below, get inspired and be sure to let us know what other creative shelving ideas did you come up with for optimizing the space around your stairs. As a result, Israel is now the world leader in the use of solar energy per capita with 85% of the households today using solar thermal systems (3% of the primary national energy consumption), estimated to save the country 2 million barrels (320,000 m3) of oil a year, the highest per capita use of solar energy in the world.
Sometimes, however, a differential controller (that can also be powered by the DC output of a PV panel) is used to prevent the operation of the pumps when there is sunlight to power the pump but the collectors are still cooler than the water in storage. The HTF typically arrives at the heat exchanger at 70 °C and returns to the circulating pump at 50 °C.
In a simple way one could consider an ICS solar water heater as a water tank that has been enclosed in a type of 'oven' that retains heat from the sun as well as heat of the water in the tank. However, since they cannot be properly drained of water, serpentine flat plate collectors cannot be used in drainback systems. Useful calculators for estimating insolation at a site can be found with the Joint Research Laboratory of the European Commission and the American National Renewable Energy Laboratory. The StickimUp can be secured in place using wood screws, metal screws or 3M automotive adhesive. The MUT is 5-inches long, weighs 11.2-ounces, and is sold with a 25-year manufacturer warranty.
It’s a tremendously flexible system that can be easily adapted to your shifting wardrobe requirements.
The ground-squirrel-shaped silhouette target is made of a self-healing synthetic material rated to withstand 500-600 rounds of .22 ammunition before it needs to be replaced. Flash the laser at the Display sensor on the lower left corner of the target to see each of your hits light up, then flash the laser on the reset sensor on the right to start over again. Best of all, the dry particles offer a lower friction coefficient than anything else on the market. The programmable biometric fingerprint scanner holds up to 120 unique fingerprints and comes with a key lock override. This modern wall unit features different connected storage pieces in a combination of wood and lacquer finishes. Choose between a wide array of finishes, you have 30 different lacquer colors and over 10 wood finishes to free your creativity.
One advantage of a PV-driven system is that solar hot water can still be collected during a power outage if the Sun is shining.
In frost prone climates the HTF is water with propylene glycol anti-freeze added, usually in the ratio of 60 to 40. Using a box does not eliminate heat loss from the tank to the environment, but it largely reduces this loss. Wherever there’s a need for instant access to a concealed handgun, this is the magnet for the job. This system arrives ready for the range right out of the box, and replacement targets can be purchased in packs of five from the Varmint Target's website. The SpeedVault is constructed of 18-gauge steel and arrives with a limited one-year warranty. Momentoitalia introduces a new flexible wall unit system with superior quality, 100% made in Italy, with many different possibilities to create top quality modern wall compositions.
Another advantage is that the operational carbon clawback of using mains pumped solar thermal (which typically negates up to 23% of its carbon savings) is completely avoided. Pumping typically starts at about 50 °C and increases as the sun rises until equilibrium is reached, which depends on the efficiency of the heat exchanger, the temperature of the water being heated, and the total solar energy available.
In many cases the payback period for a SWH system is shortened if it supplies all or nearly all of the warm water requirements used by a household. It can be used for practice, to train new shooters, or for a bit of friendly competition between shooting buddies.
Many SWH systems supply only a fraction of warm water needs and are augmented by gas or electric heating on a daily basis, thus extending the payback period of such a system. Choose from the general purpose gun oil, dense gun grease or send your gun to Crusader Weaponry for a permanent dry lubrication treatment.
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