EHRE high capacity water heater, Ecotherm (Austria) solution for water/water operation

PGTECH is the authorized representative of ECOTHERM® (Austria) in Vietnam, a world-leading brand for solutions for central hot water systems, steam systems, and solar energy for hotels, hospitals, and industrial facilities. Ecotherm impresses with its "Individual Heat Transfer Solutions" for its hot water and steam systems. Ecotherm provides turnkey solutions for hot water, steam, and solar energy systems, while also offering solutions for hotels, hospitals, and industrial applications that meet the specific requirements of each facility.

The EHRE High Capacity Water Heater is perfectly suited for facilities with high hot water demand and very limited available space. The EHRE water heater is used for water-to-water operations, such as for hotels, hospitals, residential buildings, or industrial facilities.

Features:

• Patented shell-and-tube heat exchanger with turbulator rods
• Heats cold water from 12°C to 60°C in just one second.
• Minimizes the risk of scaling and blockages inside the heat exchanger due to fluctuating water flow.
• Controller with a touch panel, anti-scaling and anti-Legionella cycles, monitoring, and a BMS system.
• Saves up to 95% of floor space compared to conventional designs.
• Made from high-quality Duplex AISI316Ti stainless steel.

High-capacity water heaters, a unique and exclusive invention by ECOTHERM Austria.

Model EHRE: High Capacity Water Heater - Domestic Hot Water Charging System (50 - 2,000 kW for water / 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 (RAL 7037), patented aluminum closure strips and self-fixing closure caps, quick and easy installation, 80 mm 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 and highest comfort at the hot water supply by primary flow adjusting by a motorized three-way control valve. Heat exchanger unit is pre-assembled and pre-wired. Primary pump and control valve are provided loosely for flexible onsite assembly.
• Safe plant operation without danger of creeping performance decrease due microprocessor controlled storage regulation with differential pressure monitoring of the shell & tube heat exchanger. The internal and external (optional) cold water flushing after completion of the charging process minimizes effectively scaling by the rapid cooling of the 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 the EHRE water heater in a domestic water supply system

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

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

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

4. 3 way control valve with electric actuator controlled by T3 to regulate the hot water supply temperature

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

6. Automatic air vent and vacuum breaker, with manual cock for rapid air expulsion during tank filling

7. Non-return valve for prevention of hot water convection back flow during standby

8. Differential pressure sensor for monitoring heat exchanger fouling

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 domestic hot water entering the tank by controlling the 3 way control valve (item 4). Used also to monitor the anti-fouling cycle

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

T5: Strap-on temperature sensor for district heating with limited return temperature rule (opt)

Pp: Primary circuit pump connected to the boiler return line and the primary circuit return outlet of the heat exchanger (opt)

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

MS: Microprocessor control unit

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

M: Motorized valves for external cold water flushing

B: BUS (ModBus, BacNet) (opt)

High Capacity Water Heater EHRE: 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)

The ECOTHERM high-capacity water heater is the result of more than 20 years of research and development. All components of these high-quality products are made from high-quality stainless steel. Each system is custom-designed to meet the customer's needs, corresponding to the specific project. ECOTHERM's engineers use their proprietary design software to design and optimize the system for maximum efficiency, minimal floor space requirements, and maximum savings on energy and maintenance costs.

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

News Editorial Board: PGTECH

Engineer: Manh Thang

PGTECH GROUP LIMITED

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