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Double buffer tank: DHW & Air Conditioning

Picture of Author: Araceli Buendía

Author: Araceli Buendía

Efitherma Marketing Department

 

Double buffer tank: DHW & Air Conditioning

Picture of Author: Araceli Buendía

Author: Araceli Buendía

Efitherma Marketing Department

Buffer tanks and Double buffer tanks.

Complete guide, operation and advantages.

In the air conditioning and domestic hot water (DHW) production sector, efficiency and performance are two important factors. Buffer tanks have emerged as an effective solution to improve the stability and performance of heating and cooling systems, especially aerothermal systems.

In this article, we will explore what a buffer tank is, how it works, it’s applications and you will also learn about the new HydroConnect from Efitherma. A new and exclusive tank that takes this concept a step further, thanks to it’s double buffer tank, which can offer DHW and air conditioning.

Index

What is a buffer tank?

A buffer tank is a tank designed to thermal energy store in the form of hot or cold water. It’s main purpose is to optimize the operation of air conditioning systems, such as boilers or heat pumps.

  • Stabilizes the system temperature.
  • Avoid frequent system on/off switching, which reduces efficiency and wears out equipment.
  • They guarantee a constant supply of thermal energy during peak demand.

How does a buffer tank work?

The buffer tank acts as a thermal energy store that regulates the temperature of the system according to demand:

  1. Load: When demand is low, the system (boiler or heat pump) transfers excess energy to the tank.
  2. Discharge: During periods of high demand, the tank releases the accumulated energy to cover the thermal need.

Is it compatible with renewable energy systems?

Yes, buffer tanks are highly compatible with renewable energy systems, such as:

  • Solar thermal systems: They accumulate the heat generated by solar panels.
  • Aerothermal or geothermal heat pumps: They help maximize their efficiency by storing the heat generated.
  • Biomass boilers: They stabilize the energy produced, which usually varies depending on the fuel load.

What capacity can a buffer tank have?

The capacity of a buffer tank can vary widely, from 50 liters to over 1000 liters, depending on the needs of the system.

Small houses

100 / 300 Liters

Commercial and residential

500 / 1,000 Liters or more

Industries

Capacities greater than 1,000 Liters

Choosing the right size depends on factors such as the power of the boiler or heat pump, the heating or cooling demand and the number of users.

In the case of a double buffer tank, the Efitherma HydroConnect model has a capacity of 180 litres for DHW and 75 litres for buffer, which is suitable to meet the needs of an average sized home. To decide the ideal capacity for your case, it is advisable to consult a professional.

Does a buffer tank require maintenance?

Buffer tanks require minimal maintenance, but it is essential to ensure their proper functioning and prolong their lifespan. The main tasks include:

  • Periodic review of connections and valves.
  • Checking thermal insulation to prevent energy losses.
  • Internal cleaning to prevent sediment or scale build-up.

What is the lifespan of a buffer tank?

The lifespan of a buffer tank is usually 15 to 20 years, depending on:

  • Material quality: Stainless steel tanks are usually more durable.
  • Proper maintenance: Regular maintenance can extend it’s life.
  • Operating conditions: Avoiding overpressures and extreme temperatures contributes to its longevity.

How much does a buffer tank cost?

Although the initial investment may be somewhat higher compared to traditional systems, the long term savings it generates in terms of space, energy efficiency and installation and maintenance costs make it a profitable investment.

Where can a buffer tank be installed?

Buffer tanks are very versatile and can be installed in various locations, depending on the available space and the characteristics of the system:

  • Boiler rooms.
  • Garages
  • Covered outdoor spaces, provided they are protected from the elements.
  • Industrial or commercial facilities with higher thermal demand.

What is the difference between a buffer tank and a double buffer tank?

A double buffer tank is an advanced solution that stores water for both air conditioning and domestic hot water, which differentiates it from a conventional buffer tank.

CharacteristicsBuffer TankDouble Buffer Tank
Function
Thermal storage for heating
Storage for air conditioning and DHW
Use
Heating or cooling systems
Air conditioning and DHW supply systems
Applications
Underfloor heating and heat pumps
Homes and buildings with DHW and air conditioning needs
Advantages
Stabilizes temperature and reduces equipment wear
It saves space, increases energy efficiency and is quick and easy to install.

Advantages of double buffer tanks

  • Space saving: By having a single device for storing air conditioning and DHW water, the need to install multiple tanks or systems is reduced, optimising the available space.
  • Energy efficiency: By integrating air conditioning and DHW functions, energy losses are minimised, as the system makes better use of the energy produced. This is especially effective when combined with aerothermal systems, which use the energy in the air to heat water.
  • Easy installation and maintenance: These tanks are usually designed for easier installation, as they require fewer connections than a traditional system with separate tanks. In addition, most models come with integrated elements that simplify the process, such as “HydroConnect”.
  • Versatility and adaptability: Double buffer tanks are ideal for all types of installations, from single-family homes to larger buildings, adapting to different energy and space needs.

HydroConnect: Double buffer tank (DHW + Air Conditioning)

At Efitherma, we have the HydroConnect model, a highly efficient double buffer tank for domestic hot water and air conditioning. This tank has a series of features that make it stand out in the market:

Tank storage capacity:

HydroConnect offers a storage capacity of 180 litres for DHW and 75 litres for buffer, allowing for an adequate supply for both domestic hot water and air conditioning.

Easy installation

It includes different outlets located at the top to connect it to the DHW system, the air conditioning system and the heat pump or chiller (aerothermal, geothermal, etc.), making its installation quick and easy.

Adaptability

This tank is specifically designed to be combined with a heat pump (aerothermal, geothermal, etc.).

General:

Air conditioning tank:

Domestic Hot Water tank:

Benefits of choosing HydroConnect

Efitherma’s HydroConnect model is not only an example of innovation in DHW storage and air conditioning, but also offers practical and long-lasting benefits:

Reduction of energy costs:

With its efficiency oriented design, HydroConnect reduces energy consumption and costs associated with the production of DHW and air conditioning.

Durability and safety:

Made from high quality materials, this double buffer tank guarantees a long service life, maintaining safety standards at all times.

Anti-Legionella:

It incorporates safety features such as protection against legionella bacterium, ensuring the healthiness of the stored water.

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