HEAT PUMPS Understanding the concept of performance • The coefficient of performance (COP) is the ratio between the restituted power and the power consumption of the heat pump. As a result, it is the ratio at specific climatic conditions too. As an example, a performance coefficient of 5 means that for 1 kWh consumed at the electricity meter, the heat supplies 5 times more energy to the water in the pool, or 5 kWh. So the higher the performance coefficient, the more efficient and economical the system. • Power, expressed in kW, indicates the quantity of heat transferred to the water. It is expressed in specific climatic conditions to which the heat pump is exposed during use: • Temperature of the outside air • Humidity of the outside air • Temperature of the water in the pool. The power of a heat pump will mostly depend on the outside air temperature. The hotter the air is, the higher the power in kW, hence the higher COP. For instance (see graphic), a Z250iQ will restitute 9kW @15°C air / 26°C water / 70% humidity. Accordingly, it is very important to compare performances in the same conditions ! Two main values characterise the performance of heat pumps: their power and their performance coefficient. 30% 10% 50% 70% 90% hygro eau 10°C 20°C 30°C air 10°C 20°C 30°C 6,8 9 13 7°C 15°C 26°C Outside air temperature Power (kW) 7°C 15°C 26°C Outside air temperature COP 3,8 5 6,5 > HOW TO READ ACOUSTIC VALUES The latest technologies used in the design of evaporators, fans and compressors make Zodiac® heat pumps extremely quiet. The noise level should be measured by a certified body to obtain a real and objective value. It is expressed: • Either as acoustic power dB(A): this is the unmodified noise level of the emitting source. • Or as acoustic pressure dB(A): this is the sound level perceived by the human ear. It depends on the installation environment and distance at which the measurement is made. It must therefore always include a measuring distance. To compare the noise level of several machines, check what type of value you have, power or pressure, and if it is pressure then at what distance it is measured! NOISE SCALE DANGER LEVEL RISK LEVEL AUDIBILITY LEVEL 1 m 50 - 42 dB(A) 10 m 33 - 25 dB(A) 5 m 38 - 30 dB(A) Acoustic power 64 - 56 dB(A) Acoustic pressure A silent installation HEATING AND COOLING 290
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