Energy Maximising Technology
The EM series is Temperzone's energy maximising range of hot water boilers. Traditionally boiler efficiency has only been considered under steady state conditions - the EM concept looks at annual operating efficiency. The average load on a heating boiler is about 35% of maximum output and often a boiler is selected with a generous margin about maximum demand.
Aquatherm EM Series Boiler
The adoption of fully Modulating Burners gives two advantages:
- The Burner modulates steadily to match the load at all times.
- The Burner is always firing unless the load falls to less than 25%.
- This gives a reduction in standby losses when the Burner is shut down as with Hi / Lo Burners.
- There are no pre and post purge losses such as on start up and shut down with Hi / Lo Burners.
Meaurements according to EDI
- Mean boiler water temperature: 70C. Boiler wuth burner cover. Draft at boiler flue outlet:
- 0.05mbar.
Annual efficiency, amounf other things depends on: Boiler
size, output and type of operation. On the basis of 2,650
operating hours pa (1/5 full load, 4/5 part load) efficiency is
approximately 92.5 - 94% based on nett CV of fuel.
- 0.05mbar.
Annual operating efficiency
- High efficiency installation with insulated boiler, sound absorber hood and flue draft control.
- Note: for flue gas temperatures below 160C stainless steel chimneys are recommended. For long chimneys the stack draft at partial load must not exceed 20% of flue gas side pressure loss. A draft regulator may be required.
Construction
- The boilers are of three pass design based on the YGNIS reverse flame principle as developed and perfected by YGNIS.
- The substantial combustion chamber is fully water jacketed and a water cooled front skirt is incorperated to maintain high heat transfer co-efficients. The tube plates are "V" prepared prior to welding and a substantial stay bar gives an evenly stressed arrangement allowing high flow and return differentials. Easily cleaned tubes are fitted with spiral retarders which allow insitu tubing of flue gas temperatures.
Thermal noise and insulation
- Standard insulation is 50mm foil backed FEI covering the complete boiler shell. An optional burner hood is supplied for high efficiency and specially quiet installations. In such cases, the cladding panels are additionally lined with insulation material and combustion air is drawn through the space betweent the panels and boiler shell and down across the boiler door to provide combustion air pre-heating and a consequential reduction in standing losses.
Burner and control system
- Continuous development work is carried out between YGNIS of Switzerland and the leading European burner manufactures to ensure perfect matching with burners for each model.
- Packaged units can be supplied as standard with CUENOD Burners.
- We recommend consultation with Temperzone Ltd design department for matching data should other brands be required.
- Compact packaged control systems are supplied for on/off, two stage Hi/Lo or Electronic Modulating Control.
Service commissioning
- Temperzone Ltd and their agents throughout the country are fully conversant with these packaged units and particularly with CUENDO Burners.
- A full commissioning service is available and for long term economy and reliability Service Contracts can be arranged to best suit each individual need.
Fuel types
- Boilers can be supplied for firing with Natural Gas, LPG, Light Diesel Oil or Heavy Fuel Oil. The refractory insulated front door is purposely designed to accept this full range of fuels.
Installation
- Packaged units are pre-assembled and test fired prior to despatch. Standard installation and maintenance manuals together with wiring diagrams are despatched with each boiler.
- Cladding panels can be packaged separately for fitting to the boiler on completion of the installation to prevent damage if requested.