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Cold weather performance of air sourced heat pumps

Any heat pump experts on here? I’m looking at air sourced heat pump performance for a friend’s installation. They have NIBE F2040’s for the house, and Waterco Ultra 31’s for pool. Both use same R410A refrigerant, but that seem to be perhaps the only thing in common. NIBE (made in Sweden) twin rotary variable speed compressors are inverter controlled as standard (I guess vector or torque type drives), whilst the Waterco units are direct on line, capacitor start induction motors (I thought that technology went out long ago), with no soft start options.
 I’m interested in COP performance in the colder weather, the Ultra 31’s are specified as generally for use in ambient greater than 10 degrees C, although they do rate this particular model down to zero, BUT do not provide COP performance below 5 ambient, but enquiries suggest a COP of around 1 (perhaps even lower, ie, less power out than in!). The NIBE manufactures claim very much better, performance down to at least -25 ambient, with COP of around 2 even at this low temperature (is that even possible?).
Anyway, any thoughts on the subject, much appreciated.

Parents
  • Water heating is traditionally carried out mainly by burning Fuel (LPG or condensed hydrocarbon gas) The thermal energy generated during combustion. This is a heating method Wasteful Performance Coefficient (COP) Relatively low (value 9.0). Furthermore, this method is environmentally harmful, Both because of the combustion products emitted into the environment - carbon dioxide, The greenhouse gas which negatively contributes to the warming Global, and air pollutants) sulfur oxides, nitrogen oxides, Particles and the like (which are detrimental to our health - and following the feasibility of soil contamination In fuels. On the other hand, similar to the principle of action Of air conditioning system, heat pump One intermediate heat pump (environment) And transfers it to a second broker, for example for the purpose Water heating. In fact, the energy produced in the process (heat) Exceeds the amount of energy invested) electrical energy in operation The heat pump compressor (thanks to the "free" pumping of energy) Which is a penny in the air. This is due to the high energy efficiency Of the heat pump in relation to that of the high COP heaters: 5.2-4 value (about 80% of the thermal energy produced) It is obtained from the air, and only about 20% is a product of the electrical energy Which is invested in the heat pump compressor, making the heat pump the most popular means of heating water today. This form of work yields high system efficiency and is the solution Preferred for heating water in small outputs (home application) and outputs Major (institutional / industrial application).
Reply
  • Water heating is traditionally carried out mainly by burning Fuel (LPG or condensed hydrocarbon gas) The thermal energy generated during combustion. This is a heating method Wasteful Performance Coefficient (COP) Relatively low (value 9.0). Furthermore, this method is environmentally harmful, Both because of the combustion products emitted into the environment - carbon dioxide, The greenhouse gas which negatively contributes to the warming Global, and air pollutants) sulfur oxides, nitrogen oxides, Particles and the like (which are detrimental to our health - and following the feasibility of soil contamination In fuels. On the other hand, similar to the principle of action Of air conditioning system, heat pump One intermediate heat pump (environment) And transfers it to a second broker, for example for the purpose Water heating. In fact, the energy produced in the process (heat) Exceeds the amount of energy invested) electrical energy in operation The heat pump compressor (thanks to the "free" pumping of energy) Which is a penny in the air. This is due to the high energy efficiency Of the heat pump in relation to that of the high COP heaters: 5.2-4 value (about 80% of the thermal energy produced) It is obtained from the air, and only about 20% is a product of the electrical energy Which is invested in the heat pump compressor, making the heat pump the most popular means of heating water today. This form of work yields high system efficiency and is the solution Preferred for heating water in small outputs (home application) and outputs Major (institutional / industrial application).
Children
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