EDRE high capacity hot water heater Ecotherm Austria for steam/water operation

The EDRE high-capacity water heater uses a patented shell-and-tube heat exchanger with a free-floating agitator, with a capacity from 100–2,000 kW for steam-to-water operation. PGTECH, the authorized representative of Ecotherm (Austria) in Vietnam, provides heat transfer solutions such as hot water heaters, pressurized heat storage tanks, boilers (water, electric, oil, gas), and solar energy solutions. We can provide a comprehensive central hot water and steam solution with a modern, safe, efficient, and highly energy-saving heat transfer system, featuring unique inventions only found at Ecotherm.

The High Capacity Water Heater Type “EDRE” is a steam operated water heater which can be used in e.g. hospitals, hotels (laundry) or the industry. Due to the high energy content of steam, a maximum output of hot water can be ensured with minimal floorspace requirement. 

Features:

• patented shell and tube heat exchanger with turbulator rods
• vertical condensate controlled heat exchanger for maximum power yield
• controller with touch panel, anti-fouling & anti.legionella cycle, monitoring and BMS
• automatic steam side shutoff valve prevents overheating
• saves up to 95% floor space compared to conventional design
• high quality stainless steel AISI316Ti and Duplex

Model EDRE: High Capacity Water Heater Domestic Hot Water Charging System (50 - 2,000 kW for steam / water operation)

• Pressure-resistant storage tank and external shell & tube heat exchanger made of high quality corrosion resistant stainless steel 1.4571/Duplex. The systems comply with the SVGW guidelines for reducing a Legionella infection risk at large-scale systems.
• Optimum hygiene through short storage time of the hot water, low standby losses and small space requirements of the compact system due to high performance of the heat exchanger and small storage capacity.
• Fibre-fleece insulation of storage tank with robust outer sheathing made of PP (RAL7037), patented aluminum closure strips and self-fixing closure caps, quick and easy installation, 80mm insulation up to 1,000 liters and 100mm above. 100% recyclable, fire protection class B2 (B1 upon request)
• Highly efficient heat transfer and most extensive prevention of liming and scaling through self-cleaning effect of patented shell & tube heat exchangers with free floating turbulator rods made of stainless steel.
• Constant hot water temperature during charging and thus the highest comfort at the hot water supply by primary flow adjusting by condensate control valve. Steam-side barrier prevents overheating of the hot water in the heat exchanger. The heat exchanger block is pre-assembled and pre-wired at the factory with strainer, condensate drain, non-return valve, safety valve and shut off valve.
• Safe plant operation without danger of creeping performance decrease due microprocessor controlled storage regulation with differential pressure monitoring of the shell & tube heat exchanger.
• Microprocessor control with touch screen for clear and easy use. Possible remote monitoring and remote control of the system through Ethernet interface. Logging and monitoring of the performance of the system and the individual components.
• Production by TÜV certified welding company according to HP-0 and ISO 3834-2, approval to SVGW and certified according to ISO 9001:2015.
• Simple installation and short mounting time due to pre-assembled units.
• Maximum pressure: secondary 6, or 10bar; primary 6 or 10bar; higher ratings possible on request

The working principle of Model EDRE:

Note:

1. Stainless steel hot water storage tank, standing, with removeable fibre-fleece insulation shell

2. Stainless steel heat exchanger with patented free floating turbulating rods, pre-assembled with piping

3. Strainer to protect control components

4. 2 way condensate control valve with electric actuator controlled by T3 to regulate the hot water temperature

5. Manual gate valve for inspection or removal of heat exchanger without draining the tank or losing service

6. Safety pressure valve set at 10 or 6 bar, corresponding to maximum tank operating pressure

7. Automatic air vent and anti-vacuum valve, with manual cock for rapid air expulsion during tank filling

8. Non-return valve for prevention of hot water/condensate convection back flow during standby

9. Steam trap ensures protection of control components from steam

10. Differential pressure sensor for monitoring heat exchanger fouling

11. Vacuum breaker

12. Shut off valve: Shut off from steam and condensate system

13. Two way high temperature safety and shut off valve with electric actuator

T1: Temperature sensor “heating on”: Signal to start preheating and charging

T2: Temperature sensor “heating off”: Signal that heating is complete. Activation of anti-fouling cycle.

T3: Temperature sensor to regulate the temperature of hot water entering the tank by controlling the 2 way condensate control valve (item 4). Used also to monitor the anti-fouling cycle.

T4: Temperature sensor monitoring the incoming steam temperature to ensure that sufficient heat is available to produce hot water at the required temperature. Also for monitoring the anti-fouling cycle.

Ps: Secondary circuit pump circulates cold domestic water from the bottom the the tank into the heat exchanger

ST: Safety thermostat shuts down system if manually set temperature is exceeded

MS: Microprocessor control unit

FS: Remote control software for control and monitoring using a PC or BMS via TCP/IP network, or internet.

High Capacity Water Heater EDRE: 3 Operating modes

Models EHRE & EDRE utilize the temperature layering property of water. These stable temperature layers enable the microprocessor to automatically switch its operating mode to quickly match fluctuating demand and substantially increase fuel efficiency by significantly reducing the number of boiler “cold starts”.

1. Operating mode STANDBY / DESCALE

Hot water is stored in the upper parts of the tank for usage. Due to the increased fouling risk in the heat exchanger due to stationary hot water, the periodic anti-fouling cycle is activated until the temperatures of T3 & T4 fall to a safe level. In the tank, the water temperature remains constant due to its temperature layering property, which prevents significant mixing with the pool of cold water in the lower parts of the tank. As usage continues and the pool of cold water rises past T1, the operating mode is changed to PREHEAT.

2. Operating mode PREHEAT (Display shows “WAITING”)

The pool of cold water has risen past T1 and the signal to start the boiler has been sent. The modulating two way valve Vr opens fully and the primary pumps circulates heating water through the primary circuit of the heat exchanger. The system monitors T4, waiting for the temperature of the incoming heating water from the boiler to rise sufficiently, before the operating mode is switched to CHARGING.

3. Operating mode CHARGING

The temperature of the incoming water from the boiler is high enough for the domestic hot water to be allowed to circulate through the secondary circuit of the heat exchanger, by activating the secondary pump PS. The cold water from the bottom of the tank is heated to the final temperature (of say 60°C) in a single pass through the heat exchanger. The temperature of the hot water entering the tank is exactly controlled by using T3 to modulate the two way valve V. The tank is charged to meet current hot water demand, or to fill the tank with hot water.

When the pool of cold water falls below the level of T2, the operating mode returns to STANDBY / DESCALE. To minimize immediate risk, the periodic anti-fouling cycle is activated immediately. Using the (optional) external cold water flushing, the heat exchanger is cooled down after completion of the charging process. Therefore the two valves at the tank are automatically closed, and the two valves of the cold water flushing are opened. After T4 falls below a defined temperature, the flushing is stopped and the valves “M” are closed/opened again.

ELC11 ECOTHERM Logic Controller

ECOTHERM high capacity water heater models EHRE and EDRE are equipped with own ELC logic control unit to ensure permanent control and performance monitoring of hot water output at all times.

The control panel is an intelligent terminal for programming and visualization of automated processes. The process of diagnosis and the operation and monitoring of automated processes are simplified by this installation terminal.

A touch screen is used to enter data and process parameters. The output is displayed on a 5.7" VGA TFT color display.

The operator has complete control of all water heater functions via the keypad and display on the front of the control unit. The operator sets the desired performance parameters, and the control unit operates the water heater fully automatically, constantly monitoring temperatures and controlling the pumps and valves to match the current hot water demand with the lowest possible fuel consumption. All automatic functions can be adjusted, switched on/off or manually overridden by the operator at any time.

Features:

• Temperature sensors
• Control of pumps and valves
• Exact temperature control
• Flexible control facilities
• Performance logging
• Fuel saving program
• Anti-fouling cycle
• Legionella decontamination cycle
• Early warning fouling alarm
• Remote control and BMS
• ModBus, BacNet (opt)

Ecotherm (Austria) is a world-leading brand with a history dating back to 1880, inheriting and building on its strengths in mechanical engineering and specialized solutions. Thousands of hospitals, hotels, schools, industrial plants, and large buildings worldwide have benefited from Ecotherm's superior central hot water and steam solutions. PGTECH is honored to be Ecotherm's authorized representative, bringing these core values and world-leading advanced technological solutions to the Vietnamese market, so that the market can benefit from these excellent technological values, "Made in Austria." Contact PGTECH today for a consultation and to find the perfect heat transfer solution for your project.

PGTECH GROUP LIMITED – Authorized Distributor of HVAC System Products in Vietnam and Regional Markets

News Editorial Board: PGTECH

Engineer: Manh Thang

PGTECH GROUP LIMITED

Business Office: 3rd Floor, Bac Ha Building C14-CT1, To Huu Street, Dai Mo Ward, Hanoi City, Vietnam

Address: No. 12, Lane 28, Tay Ho Street, Tay Ho Ward, Hanoi City, Vietnam

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Hotline: 0962 875 986 /0962 160 126

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