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conditioners

conditioners for winter heating Top Energy

publish this post as a result of numerous requests for information from our customers about the split type air conditioners and multi-split more suitable for winter heating. Frequently asked questions can be summarized as follows?

1. What technology must have an air conditioner to produce hot air?
2. For heating a model agrees ON / OFF or Inverter?
3. How to choose the power of the machine that best suits the size of the room to be heated?
4. To save on cost of bill what are the features to consider when choosing the air conditioner?

respond to questions with respect to their order and invite you to read the table with data comparing the best conditioners Top Energy for winter heating (PDF Document ).

1. To be suitable for winter heating air conditioners must be of a heat pump. Most of the models on the market have this feature, but not everyone is able to make winter heating when the temperature drops below 10 ° C. Many heat pump air conditioners produce hot air with a difference of 9-7 degrees C than external. So if in the fall or winter, the outdoor temperature is 10 ° C, inside you can have up to 19 ° C, with decreasing temperature at 5 ° C maximum produced by the air conditioner can reach more than 12 ° C. Only the most efficient air conditioners can provide internal temperatures between 20-25 ° C even when outside temperature is very hard and goes down to -10 .
   addition, we point out that dual class AA provides an indication of power consumption, but says nothing concrete than the ability to get hot. Similarly, many air conditioners also reported operating range down to -15 ° C, but this only indicates that the machine will run up to that temperature, but does not tell us if he can deliver air at a temperature suitable for heating.
   characteristics to aim for a good product for heating will be considered in future responses.
2. For heating is always convenient to use type inverter air conditioners, for the following reasons. Those on / off have operating limits that usually does not drop below 0 ° C. The motors on / off also have lower energy efficiency of 30% and ultimately do not have any type of modulation.
   Because of these three factors to use a machine on / off will be necessary to oversize the very use of a 18000 or 24000 BTU to get the heat that you can have a good 12,000 BTU Inverter.
   Consequently there will be no economic advantage, because the power consumption will be almost three times that of a car Top Energy optimized for heating .
3. The size of the space heating system must take into account a heating power of 45 W / m for an internal temperature of 20 ° C under standard conditions.
   For example, a room of 20 sqm with a height of 2.7 corresponds to 54 cubic meters and heating power of 2430 W will be required, assuming a COP of 3.60 (coefficient of heat energy) power consumption will be about 675 W which corresponds to the average value of an air conditioner 10000 BTU size.
   Please note that this value is only a first estimate, which may be augmented or confirmed by considering a range of factors including: type of property (condo or single house?), Year of construction (1950 or 2011?), Exposure of exterior wall (south or north?), number and type of windows (a small aluminum and glass single or three large wooden double-glazed?), other factors that are difficult to evaluated as a very significant from a non-expert. At worst, considering all the negative factors, the initial 10,000 BTU can also become 16000.
   It is believed that a rough estimate of up to 10% can be considered effective, that is if you install a 10,000 BTU where the exact calculation requires 11,000 BTU then the loss of efficiency will be about 5% and do not have a substantial effect on consumption. When an accuracy higher than 20% then it is absolutely counterproductive to use a smaller car and agreed to install more than just size BTU actually needed. This mode of choice is the technology used to family of inverter-type compressors Scalare, cioè tutte le taglie dalla 8000 alla 19000 BTU hanno sia l'assorbimento minimo sia la potenza minima erogabile identiche . Quindi rispetto all'esempio precedente un 10000 BTU o un 19000 BTU possono erogare 2430 W con assorbimento di 675 W per cui il consumo elettrico sarà identico, ma utilizzare un 8000 BTU è controproducente perché la macchina sarà costretta a lavorare sempre con il massimo carico e il consumo elettrico risulterà eccessivo.
4. Per avere un buon riscaldamento invernale con una spesa in bolletta al minimo è necessario utilizzare una macchina del tipo Top Energy , cioè oltre la classe A.
   A) Per realizzare low power consumption is not sufficient that the unit is class A with a COP of 3.60, but you need a value of at least 4.00 and more importantly the COP at partial load must be at least 7.50 .
   B) The second factor to consider is the minimum flow , which corresponds to cubic meters of air per minute which can be heated when the fan is running at minimum speed of the split that with minimal power consumption , the value considered optimum is at least 6.5 cm / min .
   C) The third factor is the minimal use of power which is measured in watts, the lower this value is less sarà il consumo a carico parziale e con la minima velocità del ventilatore, il valore minimo richiesto è di circa 150 W (0,150 kW) .
   Utilizzando questi tre fattori nell'esempio precedente per fornire 2430 W con un COP di 4,00 il climatizzatore assorbirà circa 607 W (0,607 kW). Questo assorbimento sarà mantenuto per il tempo necessario a riscaldare tutta l'aria presente nella stanza, considerando una portata di 6,5 mc/min e 54 mc da trattare il tempo richiesto sarà di circa 8 minuti. In seguito il condizionatore deve solo mantenere la temperatura impostata per cui può lavorare a carico parziale, circa il 30% della potenza massima. In queste condizioni il COP sale a 7,5 è l'assorbimento elettrico scende a 324 W (0,324 kW). Inoltre, se nell'ambiente ci sono altre fonti di calore, come il sole che entra dalla finestra, un computer acceso o 2 persone in attività, il climatizzatore tenderà a diminuire ulteriormente l'assorbimento avvicinandosi il più possibile al suo minimo con assorbimenti compresi tra 150 e 200 W. Facendo un esempio pratico per riscaldare dalle 8:00 alle 13:00 un ufficio di 20 mq con un computer acceso, un climatizzatore Top Energy assorbirà circa 1500 W che tradotti in consumo elettrico corrispondono a 1,5 kWh equivalenti ad una spesa in bolletta di 0,33 € comprensivi di tasse e spese varie.
   

Di seguito riportiamo il link ad a previous post in which we have provided a sample calculation for the comparison in winter heating between using natural gas boiler and electricity with high efficiency heat pump, which is useful for those who want to learn more. Please note that the discussion in the kWh price of electricity has been taken from € 0.166, while in this article the economic calculation was performed with a higher value equal to € 0.220 / kWh.

http://installazione-caldaie-condizionatori.blogspot.com/2010/06/pompa-di-calore-alta-efficienza.html

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