Aerothermics: advantages, benefits and applications
Aerothermal energy, a sustainable and efficient option
Aerothermal systems are designed to provide heating in winter, cooling in summer and hot water all year round by extracting the ambient energy contained in the air by way of a thermodynamic cycle. Being considered a clean energy it has numerous benefits, for both you and the environment. Find out more about them below.
Heat pumps are becoming increasingly efficient and will play a key role in the decarbonisation process.
The transition towards a low-emission economy is possible, but to achieve this it is essential to develop more efficient energy carriers and end uses. Decarbonisation and electrification are an opportunity for creating wealth, generating green jobs and improving air quality —the goal of the European Union (EU), for example, is to achieve net carbon-free emissions by 2050—. The challenge, therefore, concerns the energy sector in particular, but also society in general, because this process will be vital in combating climate change.
The electrification of transport and residential heating, and the production of electricity — electrical self-consumption — via renewable energies will form a key part of the road map to be followed by the energy sector for decarbonising the economy. It is here where clean alternatives come into play, such as wind energy, photovoltaic energy, hydroelectric energy, green hydrogen, hybrid energy and aerothermics. Let's now find out a little bit more about the latter.
Aerothermics and the demand for heat. Applications
Aerothermal systems are heat pumps that extract the ambient energy contained in the air via a thermodynamic cycle for providing heating in winter, cooling in summer and hot water all year round. Electric heat pumps have extremely high potential —they are far more efficient than conventional boilers— and will therefore play a key role as an element of change when it comes to electrifying and decarbonising heat demand.
In Europe, for example, the use of heat represents 50% of end user demand for energy. Within that use, heating and domestic hot water (DHW) in buildings represent over 60% of heat requirements. Industrial thermal processes add around 30% and cooling, more important in the south than in the north, only 2%.
How aerothermal energy works. Heat pumps
The latest electric heat pumps are a very efficient technology, so much so that the regulators consider them to be renewable. The basic reason for this is that it is based on a thermodynamic cycle capable of extracting heat from the outdoor air thanks to the use of refrigerants.
How does an
aerothermal heat pump work?
Outside temp:
+7 °C
+7 °C
EXTERIOR UNIT
Primary circuit:
Ambient air,
underground water,
sealed probe, etc.
Primary circuit:
Ambient air,
underground water,
sealed probe, etc.
Inside temp:
+22 °C
+22 °C
INTERIOR UNIT
Secundary circuit:
Heating circuit, hot
water storage, hot
air ducts, etc.
Secundary circuit:
Heating circuit, hot
water storage, hot
air ducts, etc.
Refrigerant temp: -15
oC
Low-Pressure Liquid
Low-Pressure Liquid
Refrigerant temp: 0
oC
Low-Pressure Gas
Low-Pressure Gas
Refrigerant temp: +60
oC
High-Pressure Gas
High-Pressure Gas
Refrigerant temp: +30
oC
High-Pressure Liquid
High-Pressure Liquid
COMPRESSOR
EXPANSION VALVE
EVAPORATOR
CONDENSER
Refrigerant fluid (RF) in liquid state at low temperature. It passes
through the evaporator and absorbs heat from the primary circuit.
through the evaporator and absorbs heat from the primary circuit.
RF in gaseous state at low temperature. On absorbing energy in
the evaporator it turns into a gas.
the evaporator it turns into a gas.
RF in gaseous state at high temperature. On passing through the
compressor its pressure and temperature increases.
compressor its pressure and temperature increases.
RF in liquid state at low temperature. On passing through the
expansion valve it releases its energy in the condenser and reverts
to its initial state (liquid).
expansion valve it releases its energy in the condenser and reverts
to its initial state (liquid).
SEE INFOGRAPHIC: How does an aerothermal heat pump work? [PDF] External link, opens in new window.
The refrigerants, which are undergoing constant development, are one of the key factors in heat pump performance. The latest most extensively used refrigerant in these pumps is R32, which reaches temperatures of up to 70ºC and is capable of improving efficiency. Others are also under development, such as R-290 (propane), R-744 (CO2) and the nano fluids.
A heat pump's performance depends both on the input (outside) and output (inside) temperatures. The most widely adopted thermal distribution systems are, therefore, the low temperature ones, such as underfloor heating and cooling. Its use for DHW or for high-temperature radiators provides a lower performance, although it must be said it is much higher than that of conventional boilers. To work, a heat pump requires the following components:
Compressor
Its job is to transform electrical energy and raise the pressure of the refrigerant fluid.
Condenser
This component condenses the refrigerant, which is transformed from a gas to a liquid by the heat exchanger.
Expansion valve
This device generates a high load loss by reducing the temperature to cause the refrigerant fluid to expand.
Evaporator
This element causes the refrigerant fluid to evaporate. The heat is then absorbed and the cycle restarts.
The advantages and disadvantages of aerothermics
Aerothermics provides numerous benefits, not only for the private user, but also for society as a whole, and it is for this reason that the majority of new-build housing is fitted with this type of systems:
It offers a high level of efficiency and performance.
It helps reduce emissions and energy consumption, thereby contributing to the Sustainable Development Goals (SDGs).
It helps users to make savings on their bills after the initial outlay and it is useful all year round.
It is convenient, safe and reliable as it does not depend on fuel supplies or complex maintenance procedures. Furthermore, its functional design is relatively simple.
It improves air quality at local level by eliminating completely emissions of the NOx (nitrogen oxide) and SOx (sulphur oxide) particles produced by combustion boiler-based systems.
Public bodies are promoting measures to encourage the development of electrification via, for example, tax incentives.
All of these benefits face the obstacles that the introduction of heat pumps face presently and which we examine below:
- Domestically, a sufficient outdoor space is required. although this is becoming increasingly smaller thanks to technological advances. Aerothermics generators also need an indoor space for the heat exchanger and the DHW storage system. In addition, these generators give off heat in the summer, meaning they require about 3 metres of free space around them.
- The high price of the machines, as well as the cost of installing the new equipment, make the changeover cost greater than that of fitting a conventional boiler plus an air-conditioning system for the entire home. However, this is offset by a lower operating cost.
- Traditionally, air-source heating is associated with: thermal discomfort — in splits there can be an excess of air flow speed and a dry atmosphere —, low inertia — systems that instantly stop heating when turned off — and noise nuisance. However, the use of aerothermics with underfloor heating and cooling is a perfect combination that makes it possible to take full advantage of all of this technology's capabilities (a warm floor in winter and cool floor in summer).
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394 width: 100%;
395 }
396 .decContenido #relacionados2col .us__module.us__module-distributiva-master .us__module-content-wrapper .us__content-container .us__row-container .us__column .us__image {
397 width: auto;
398 }
399}
400@media all and (min-width: 992px) {
401 #decContenedorInterior #relacionados2col .us__module p.us__font-black {
402 display: -webkit-box;
403 -webkit-line-clamp: 4;
404 -webkit-box-orient: vertical;
405 overflow: hidden;
406 text-overflow: ellipsis;
407 }
408 #relacionados2col .us__module .us__module-content-wrapper .us__content-container {
409 width: 50%;
410 }
411 #relacionados2col .us__module .us__module-content-wrapper .bordeCarrusel .us__content-container, #relacionados2col .us__module .us__module-content-wrapper .nobordeCarrusel .us__content-container {
412 width: 100%;
413 }
414}
415
416</style>
417</@>
418<@liferay_util["html-bottom"]>
419<script>
420
421$(document).ready(function(){
422
423$(".carruselDistrib2col").owlCarousel({
424 dots:true,
425 margin: 18,
426 responsive: {
427 0: {
428 items: 1
429 },
430 768: {
431 items: 2,
432 margin: 15
433 }
434 }
435 });
436 });
437
438</script>
439 </@>