The direct injection steam heater produces large volumes of hot water by directly injecting steam. It comes in useful when hot water is required at precise temperatures and where space and energy savings are major factors to be considered.
Most facilities use a direct injection steam heater when they can generate their process steam and where process hot water is required in large volumes under precise temperature control. This makes it highly energy efficient as compared to conventional heat exchanger or indirect systems.
A direct injection steam heater heats cold water by directly injecting it with steam. Its principals benefits include energy efficiency, provision of unlimited supplies of hot water, size compactness and precise temperature control.
It’s energy efficient because the steam is directly injected into the water and save up to 28% energy as compared to indirect systems.
All the steam’s Btu’s are used in heating the water. Moreover, in the process of directly injecting steam, the full volume of steam gets condensed in the water as it heats up. This eliminates the need for return lines that are condensate and come with energy losses and maintenance problems regarding the steam trap.
The more recent direct injection steam heaters are designed to provide the most accurate temperature control both in start/stop applications and at variable and constant flow rates. This becomes possible because the heat moves from the steam to the liquid immediately as the heating starts.
On the contrary, as steam flow and demand stop, the heating ceases immediately unlike heat exchangers which continue to release all residual energy.
The direct injection steam heater is also known to cut time and enhance speed of operations by instantly heating the water on a straight‐through continuous basis as it keeps getting used. This ensures a steady and continuous hot and cold water supply if the direct injection system is properly aligned with the available supply of steam.
Ever since its inception, the direct injection steam heater has ensured that its user never runs short of hot water and also doesn’t need to store large volumes of hot water either.
The sheer compactness of these heaters allows them to be hung from walls, ceilings, or on compact floor skids.
This saves considerable space, particularly in smaller areas that won’t accommodate a full-fledged storage tank. This has made direct injection steam heaters the preferred choice when replacing larger storage tanks in existing buildings.