How and what to choose a heat pump water water

21 June 2015 Alexei

What heating equipment to choose? It is represented by models that use wood, electricity, diesel, gas as fuel. Based on economic factors, the cheapest wood.

But units operating on such fuel emit a lot of harmful substances into the atmosphere. They also have other disadvantages. Therefore, they are not widely used, which cannot be said about high-tech modern equipment, such as a water-to-water heat pump. This device allows you to extract environmentally friendly energy and use it to heat the room. But it also has its pros and cons, which you should know in advance.

Design features and principle of operation

Equipment of this class consists of the following elements:

evaporator;
Capacitor;
compressor;
Throttle.

Freon gas circulates inside the device. The operation of the water pump for heating is as follows. Water from the well rises through the evaporator tubes.

It has a temperature of about 10°C. Upon contact with the tubes, part of the refrigerant boils, taking energy from the water. This becomes possible because it has a boiling point of 2-3°C.

Cooled water through the evaporator is discharged into the well, and the freon is sucked in by the compressor. In this case, it is compressed and pushed into the condenser. Since the freon temperature is about 80 ° C, it condenses on the tubes, transferring its energy to the water from the heating system and thereby heating it. Then the liquid refrigerant is collected at the bottom of the condenser, from where it returns through the throttle to its original place - the evaporator. This is how a water pump works.

The principle of operation of the device

It should be noted that the organization of the heating system on only one such device is inefficient. Since it cannot obtain a sufficiently high temperature and pressure. Therefore, it is best to use water pumps for heating systems in combination with thermal screens or underfloor heating, which can operate at a coolant temperature of no more than 40 ° C.

Advantages and disadvantages of equipment

Water-to-water heat pumps are among the most economical among similar devices. They need no more than 0.35 kWh of electricity to transfer 1 kW / h of energy to the system. This indicator is one of the main advantages of the equipment, but far from the only one.

We watch the video, a little principle of operation and types:

The advantages of a water pump for heating include the ability to switch modes - heating / air conditioning. When used in summer, fan coils are connected to an external collector.

The reliability of the water pump for heating is ensured by the presence of automation in the design. Therefore, the operation of the equipment does not require special skills, and the device itself does not require special maintenance.

Other advantages of water-to-water heat pumps include:

Compactness;
Silent operation.

But geothermal equipment also has its drawbacks. This is a large cost of the equipment itself, as well as the installation of heat exchange circuits, underground or underwater.

In addition, all water pumps for heating have such a disadvantage as the relatively low temperature of the heated water, which does not allow the equipment to be used as the main source of heating.

What you need to know when choosing a heat pump

The variety of types of such geothermal equipment allows you to purchase a unit for any object. Moreover, such a device is able to rationally use natural resources, while supplying the building with a volume of heat.

Watch a video about pumps and their application;

But before you buy a water-to-water heat pump, you need to study the technical characteristics of water-to-water heat pumps. This will help to take into account all the nuances during installation and further operation. Not all geothermal models can work with water of any hardness. Therefore, it is first advised to take a sample that will help evaluate the corrosive properties and the excess of trace elements such as:

Manganese;
Iron.

Since the water-to-water heat pump can be used both as a main and in combination with other equipment, it is necessary to determine which option is most suitable for your premises. There are two main modes:

Monovalent in which the device is the only source of heat;
Bivalent in this case, it is used with a boiler operating on any of the existing types of fuel.

Overview of popular models

In addition to technical characteristics, the brand of the manufacturer has a significant influence on the choice of equipment. Most users prefer to purchase products from foreign companies, despite their higher cost. Some of the most popular models are water pumps for heating systems of the following brands:

hotjet;
waterkotte;

Equipment under the Hotjet brand is a new generation of geothermal devices in which all the main components and parts have been improved. As a result, the unit has a new design of the cooling circuit and control units.

Products of the brand Waterkotte

This made it possible to achieve a reduction in noise during operation, as well as changes in size. Today, the device has compact dimensions, is equipped with a passive cooling function and is able to heat water up to 75 ° C.

The advantages of water-to-water pumps of this brand include:

More stable performance;
Lack of aerodynamic noise;
Ability to operate in any weather.

The equipment of the German company Waterkotte is one of the most efficient models in use. This is due to the use of advanced knowledge in their manufacture. These heat pumps are distinguished by a high level of efficiency, in some models it exceeds 500%. At the same time, this indicator does not depend on the operating conditions and remains constant throughout the entire operation of the device.

split system model PEA

Among the products of domestic companies, equipment under the PEA brand is in the greatest demand, the price of which is lower. They are small in size, and some models can be installed on a vertical surface. Equipment of this class can be mounted indoors, while it has a coating that is an effective protection against corrosion and is able to heat water up to 75°C.

An underground collector, well or well can be used as a heat source for such equipment. The PEA brand heat pump is designed not only for heating, but also for the preparation of hot water, it is also suitable for use in a floor heating system.

Operation features

Geothermal equipment requires well-executed installation. Since they can be used with open water bodies, their depth must be determined in advance, as well as the level of freezing in winter. In order to receive thermal energy year-round, the storage sleeve must be laid at a depth of at least 1.2 m.

If the heat pump is selected and installed correctly, in compliance with all requirements, then it will not need maintenance for several years. The only thing you have to take care of is the control of the operation of the transfer pump and its regular lubrication. But if the device is being serviced in one of the centers, then this work will be performed by its specialists.