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Air-water heat pump: operation, advantages and disadvantages, consumption and factors to consider before buying.
In the articleHow a heat pump workswe have seen how the same equipment, if properly set up, can perform both the heating and cooling functions.
In the same article we also showed you an overview of the heat pump models:
- water-water heat pump,
- ground water heat pump,
- air-to-air heat pump (classic air conditioner)
- air-water heat pump.
Today we will focus on theair-water heat pump. Technologyair - air is what we find inheat pump air conditionerswhich is strongly comparable to the air-to-water heat pump conditioner.
THEair-water heat pump conditionersrepresent the last frontier of efficiency when it comes to systems ofair conditioningeasy to install and low cost (see the benefits).
There air-water heat pump sees a very positive energy balance: generally the thermal energy yielded by a heat pump it is four times the power consumption of the machine, this is true for each type of pump. This estimate tends to drop when theheat pump air conditionerit is used to heat rooms in very harsh climatic conditions. Let's find out togetheradvantages, consumption, characteristics and operation.
Air-water heat pump and ice defrost
There are two types ofair heat pumps, the most common is thatair-to-airwhich is able to extract heat from the air so as to pour it into or out of a building according to the season. Similarly, theair-water heat pump takes the thermal energy from the outside air of the house and transfers it to the air conditioning system.
Thereair-water heat pump must be installed outside the building and therefore requires an automatic defrosting system: when the external radiator operates as an evaporator, in air-water heat pumps, its surface is at a low temperature and in winter, when even the outside air is cold, ice forms.
The automatic defroster serves precisely to melt the layer of ice which would otherwise cause a reduction in the efficiency of the heat exchange and a consequent increase in consumption. To reduce the thermal energy necessary for defrosting theair-water heat pump, a valve reverses the cycle and the external evaporator fan stops.
The automatic defrosting system can be "intelligent"Or more mild, in fact either an external temperature sensor and a timer are used that at time intervals inverts the cycle and defrosts (sometimes defrosts even when not needed), or a more advanced control system is adopted which monitors the flow and the refrigerant pressure can only defrost when necessary.
A more intelligent, albeit more expensive, system is advisable because it avoids unnecessary defrosting and therefore improves the efficiency of theair-water heat pump.
Air-water heat pump, how it works
The machine manages torip offthermal energyfrom the air and transmit it through the water that flows in a circuit of the house. Generally it consists of an external and an internal unit, however there is no lack of monobloc solutions.
Structurally, oneair-water heat pumpit can be compared to a canonical conditioner. The classic air conditioner, in fact, is oneair-to-air heat pump!
Thereair - water heat pumpit is composed of an external unit containing freon at very low temperatures. Freon is able to absorb thermal energy from the air and then pass it to a fluid (water) which transmits it to the indoor unit and to the house. The fluid releases the thermal energy collected in a piping system that acts as a heating circuit.
The heating circuit can be given byradiatorsor from coils to the floor.
Air-water heat pump conditioner, is it worth it?
The optimal yield of aheat pump air conditionerit is obtained in Southern Italy, when winter temperatures are never excessively low.
THEconsumptionlower, in fact, for domestic heating, are recorded when the external temperatures do not drop below 5 - 7 ° C. Below 5 ° C, iheat pump air conditionersthey still manage to heat the house but do so with higher consumption.
Monobloc or dual-block air-water heat pump
There are models of monobloc air water heat pumps that have only one unit to be installed outside the building and to be connected to the heating and / or hot water system. Some models may require a refrigeration line. The bi-block systems, on the other hand, consist of an outdoor unit and a hydraulic module which in some cases is associated with a water tank to facilitate installation.
Air to water heat pump, advantages and disadvantages
Betweenadvantagessystems ofair-water heat pump air conditioning,we undoubtedly point out the purchase cost.
Compared to systems awater - water heat pumporwater - earth,the systemair - waterit is much cheaper and undoubtedly easier to install.
Of course the most economical heat pump system of all is the air-to-air one, however iair - water heat pump conditionersthey can be installed with the same ease, without cumbersome works.
If accessibility proves to be the main advantage, it is necessary to clarify that the yield is linked to atmospheric conditions. This is even more true for the air-to-air heat pump conditioners but the same defect is not evident in water, water and ground water heat pumps.
The air-to-water heat pump is not convenient in those locations with severe and long winters.
In the photo, a Panasonic 5kW monobloc heat pump solution associated with a tank