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Curiosity Insight

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Learning never exhausts the mind

How to Calculate the Temperature Rise Time of a Heat Pump?

August 24, 2020 By Miranda Jackson Leave a Comment

Have you invested in a pool heat pump ?! Great, you have to choose your ideal temperature, and the heat pump takes care of the rest! But when you just installed a pool heat pump or put it back into service in the spring, how long will it take to reach the desired temperature?

The pool heat pump is a slow heat. The rise in temperature is gentle; it is about 1 to 3 ° C per day. The more powerful the CAP, the faster the temperature will rise.

During the very first start of the heat pump, it is necessary to run it continuously until the desired temperature (set temperature) is reached. In this case, it is required to turn the filtration pump consistently, 24/24.

The temperature rise time of a heat pump depends on some parameters.

As a general rule, as soon as the heat pump is switched on, the water temperature can increase by 1 to 3 ° C per day. This will depend on several criteria:

  • The size of the pool, and subsequently, the volume of water to heat. The more important it is, the more they rise in temperature will take time.
  • The power of the heat pump, because the more powerful it is, the more the temperature will increase more quickly.
  • The difference between the initial water temperature and the desired one, because the longer this interval is essential, the longer it takes to reach the goal.
  • From the environment, insofar as the climate, the exposure to the winds or contrary to the sun can influence the acceleration of the rise of the temperature. Note also that an indoor pool is much easier to heat because there is less risk of heat loss: 1 to 2 ° C only per night against 4 to 5 ° C for an open pool.

How long to get the set temperature of the pool heat pump?

There is a formula for approximately calculating the temperature rise of a pool heat pump:

Rise time (hours) = [Volume (m3) x Temperature difference (desired temperature – initial temperature) x 1,163] /   Restored pump power (kW)

Example with a concrete case

  • Dimensions of the pool (rectangular shape): 8 x 5 x 1.5 m (1.5m being the average depth) to Pool volume: 10 x 5 x 1.5 = 75 m3
  • Initial water temperature: 15 ° C / Desired temperature: 28 ° C to Temperature difference = 13 ° C (28 – 15)
  • Power of the heat pump: 13 kW
  • Filtration time: 24 hours
  • Climatic conditions: Temperate climate
  • Wind exposure: low
  • Bubble cover protection: yes
  • Basin type: Standard (without overflow)

Rise time = [75 x 13 x 1,163] / 13 = 87.22 hours, or about 3.6 days.

Unique formula for cold seasons

During cold seasons (with ambient air at 15 ° C), it is necessary to multiply the previous formula to a coefficient (1.25).

Temperature rise time (cold seasons) = [(Volume x Temperature difference x 1.163) /  Power output of the pump (kW)] x 1.25

Using our example: 87.22 x 1.25 = 109.02 hours, which is about 4.5 days.

NB: A pool not protected by a bubble cover loses between 4 and 5 ° C per night, while a protected pool, loses between 1 and 2 ° C.

Filed Under: Science & Technology, Topics

About Miranda Jackson

I am a chemistry researcher and research various household products to make life easier and enjoyable for people around the world.

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