How Heat Pumps Work?

 In Energy Management News, Questions & Answers, Swimming Pool & Spa News, Swimming Pool Heat Pumps

Pool Heat Pumps

For over 30 years now, the Toyesi’s range of swimming pool heat pump has been used in the Australian swimming pool and spa industry. It incorporates the same level of highly reliable technology that that has been used in the air conditioning industry for some considerable years.

Putting it all into perspective, heat pumps are globally recognised as being extremely energy efficient and capable of delivering short payback periods in comparison to other forms of pool heaters. their energy efficient stems from the fact that they are capable of extracting heat from the surrounding air and transferring it towards heating circulating water. And in basic form, that is how heat pumps work.

heat pump placement - How Heat Pumps Work?

Other FAQs

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How Heat Pumps Work

Heat pump theory rests on the principle that heat will move from a higher temperature to a lower temperature. Hence, if a heat transfer coil can be kept at a lower temperature than its surrounds, it will absorb heat.

heat pump flow - How Heat Pumps Work?

For those technically minded, the Toyesi heat pump captures heat from the surrounding environment by using a fan to draw air through finned tube type heat exchange, which is also know and the evaporating coil.

The coil is designed to be cooler than the ambient, usually by 6 to 10 degrees. The ambient heat is then absorbed by the low temperature refrigerant gas circulating in the system, before it moves to a compression process. The air passing through the heat pump in turn will drop by the same 6 to 10 degrees, hence the cool air that can be felt leaving a heat pump.

As the refrigerant absorbs heat it becomes a gas or vapour state which is ideal for compression. The vapour-compression process super heats the refrigerant gas, which also gains additional heat from absorbing motor winding heat of the compressor.

The resulting heat of the high temperature refrigerant is then transferred to the circulating pool water via a refrigerant to water heat exchange. Toyesi uses a marine grade, or titanium tube-in-tube refrigerant-to-water heat exchanger.

To put simply how heat pumps work is a simple process of transferring heat from one energy source to another. This process was known as pumping heat energy from A to B. And hence why a heat pump got its name.

Understanding COP’s

Heat pumps have varying efficiency for different ambient conditions. These efficiencies are commonly refereed to as its coefficient of performance. (albeit COP). The higher the number the efficient the heat pump. COP is calculated by dividing its output heating capacity (kW) by its input power consumption (kW).

How Does Toyesi’s Heat Pumps COPs Differ?

There are many different heat pumps in today’s market. Many claim amazing COPs, and unfortunately much of which is marketing trickery.

Many list COPs during summer conditions, or heating loads where the is not much work to do. That means 27 Celsius ambient or warmer, and 27 Celsius pool water. Very little heating required and a lot of energy in the air available. Quoting COPs at these conditions, often falls short during winter when there is little energy in the air.

Toyesi quotes its COPS at an ambient of 15 Celsius for our standard systems, or at project conditions which could be much lower ambient temperatures. Toyesi systems generally have COPs of around 5 at 15 Celsius, and can go as high as 8 or 9 in mid summer.

600 cop graph - How Heat Pumps Work?
Based on Pool Temp 27C

Understanding peak use COPs is your best ammunition for selecting the correct heat pump for your swimming pool project.

Inverter technology, offer even higher COPs. however these again are based on lowest heat loads and lowest demands, making it easy to achieve these values.  However, once you realise the COPs in mid winter under full load, they do not differ significantly form standard non-inverter heat pumps.

The other significant factor that makes Toyesi heat pumps have higher standard COPs is that we size a unit based on a few factors.

  1. Pool location and environmental conditions.
  2. Desired heat load at peak use period.
  3. We design the system around the compressor capacity, rather than a generalised system.
  4. We select components to support the maximum output based on the compressors capabilities.
  5. Rather than a extra large coil, we use a 5-deep coil for maximum heat absorption from the air.
  6. We have our trade-feature water balance COP kit. allowing for fine water trimming to maximise COP all year round.
  7. And other in house trade secrets.
  8. Side or end mounted fans rather than top fan. This prevents the cooler discharge air falling back down and being recirculated through the heat pump super chilling the system in the process. Known as the mushrooming effect, that decreases significantly a heat pumps performance.
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Sample collection of Toyesi & Trident Heat Pumps and Chillers..

If you want to now how Toyesi can help you and your water or pool heating project increase energy efficiency, reduce running costs or minimise your waste energy then give us a call.

Contact us on Facebook, phone: 02  9679 9400 or by email and we can discuss how we can best assist you in your projects. Alternatively download a company brochure

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NSW 2148, Australia
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Phone: (612) 9679 9400
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