In plumbing applications, a heat pump is sometimes used to heat or preheat water for swimming pools or domestic water heaters.

Around each burner is a priming pan used to preheat the burner.

The burner is then turned off, and the fuel ignited to preheat the burner.

The principal benefit of this is conservation of water, but the thermodynamic efficiency of the engine is also increased, since much of the heat otherwise lost in the exhaust is used to preheat water injected into the boiler.

High molecular weight hydrocarbons are often used for this application ; a diluent with a lower molecular weight, boiling off during the preheat phase, is usually used to aid application.

It is not recommended for starting some diesel engines that have preheat systems in the intake or glow-plugs installed as this may lead to damage to the engine.

Another variation is where bleed steam from between turbine stages is sent to feedwater heaters to preheat the water on its way from the condenser to the boiler.

( Japan ) and CSTB ( France ) preheat the oven with the safe inside until the temperature reaches the desired setting ( as opposed to a sustained temperature of the rating ), then the safe is cooled artificially ( as opposed to naturally ).

The preheat section is where the solvent in the paste begins to evaporate, and if the rise rate ( or temperature level ) is too low, evaporation of flux volatiles is incomplete.

Often, a few tonnes of liquid steel and slag is left in the furnace in order to form a " hot heel ", which helps preheat the next charge of scrap and accelerate its meltdown.

A pastorale, also spelled pastoralli, and pastorali, is also a long handled metal tool used for holding a plate to preheat glass in a furnace for glassblowing.

The purpose of the feedwater spray nozzle ( A ) and the preheat section is to heat the boiler feedwater to its saturation temperature to facilitate stripping out the dissolved gases in the following deaeration section.

The middle is a low power factor preheat ballast for a single 30-40 W lamp while the bottom ballast is a simple inductor used with a 15 W preheat lamp.

In the conventional reflow soldering process, there are usually four stages, called " zones ", each having a distinct thermal profile: preheat, thermal soak ( often shortened to just soak ), reflow, and cooling.

Challenges to this approach include relatively low drive temperatures, resulting in slow implosion velocities and potentially large instability growth, and preheat caused by high-energy x-rays.

Some burners even use steam as premix to preheat the air and create better mixing of the fuel and heated air.

Diesel engines rely on fuel compression for ignition, but usually also have glowplugs that preheat the combustion chamber to allow starting of the engine in cold weather.

Most tanning beds use choke ballasts, a technology that has been around for about 100 years, consisting of an inductor which limits amount of current passing through, and requires a lamp starter to preheat the ends of the lamp briefly at start.

Recuperators have also been used to recover heat from waste gasses to preheat combustion air and fuel for many years by metallic recuperators to reduce energy costs and carbon footprint of operation.

It consists of a double-wall gas generator, a perforated burner ring, and an inner preheat chamber.

The inner wall also creates a convenient preheat chamber for starting the stove.

The short reverse run on the start up would expel any liquid accumulated inside the compressor pumping element back into the crankcase, as well as preheat the liquid stored in the crankcase by dissipated motor heat.

The temperatures at which linear coal-fueled MHD generators can operate are limited by factors that include: ( a ) the combustion fuel, oxidizer, and oxidizer preheat temperature which limit the maximum temperature of the cycle ; ( b ) the ability to protect the sidewalls and electrodes from melting ; ( c ) the ability to protect the electrodes from electrochemical attack from the hot slag coating the walls combined with the high current or arcs that impinge on the electrodes as they carry off the direct current from the plasma ; and ( d ) by the capability of the electrical insulators between each electrode.

These plants would recover MHD exhaust heat for oxidant preheat, and for combined cycle steam generation.

Connects both ends of the lamp together to " preheat " the lamp ends for 1 second before lighting.

He was delighted to learn that the Post Office Department is now going to expand this service to deliver mail from Representatives in Congress to their constituents without the use of stamps, names, addresses or even zone numbers.

This is especially important if you live in a mild-winter zone.

Pitchers grumble about lively balls and lively bats, the shrinking strike zone, and the fact that the knock-down pitch is now illegal.

Some species in the Plethodontidae have a weak zone at the base of the tail and if the salamander is in danger or if the tail is grabbed by a predator, it breaks off, a process known as autotomy.

The region north of this circle is known as the Arctic, and the zone just to the south is called the Northern Temperate Zone.

The state is sectioned into three fishing zones, Eastern, Central and Western with each fisher required a zone allocated licence.

In the west the zone of high land is broader but somewhat lower.

This ability to maintain discipline and break out or maneuver away from a killing zone is a hallmark of good troops and training in any ambush situation.

First, a suitable killing zone is identified.

This ambush is normally triggered only when the enemy is well into the kill zone.

Associated with the Circumpolar Current is the Antarctic Convergence where the cold Antarctic waters meet the warmer waters of the subantarctic, creating a zone of upwelling nutrients.

* The bonded zone is large

The province is on the border of what may be called the arid zone ; it is the debatable land between the north-eastern and south-western monsoons, and beyond the influence of either.

* January 23, 2011: The pedestrian zone Akihabara's Chūōdōri High Street is reopened 2 1 / 2 years after the massacre with a memorial service and new rules.

The goal of the LAFTA is the creation of a free trade zone in Latin America.

So-called structure zone models were developed to describe the micro structure and ceramics of thin films as a function of the homologous temperature T < sub > h </ sub > that is the ratio of deposition temperature over melting temperature.

Southeast Alaska is a temperate rain forest within the Pacific temperate rain forest zone, as classified by the World Wildlife Fund's ecoregion system, which extends from northern California to Prince William Sound.

Where the edges of an atomic terrace causes deflection, a low density line is formed and is termed a " zone line ".

During a 1935 – 1942 colonization attempt, the island was most likely on Hawaii time, which was then 10. 5 hours behind UTC .< ref > Since it is uninhabited the island's time zone is unspecified, but it lies within a nautical time zone 12 hours behind UTC.