Heat pumps equipment overview in terms of its efficiency

Husky heat pumps and energy savings 

There are several main types of heat pumps:

  • Air
  • Ground
  • Exhaust air
  • Water
  • Solar-assist

These are used by the domestic consumers, while three more types (magnetic, thermoelectric, and thermoacoustic) are used by industrial consumers only, so we won’t consider their efficiency in this article describing some aspects of heat pump savings comparison.

Every efficiency level of a Husky heat pump, working for heating or cooling, is measured by COP (coefficient of performance). When saying that COP is equal 2, we mean that it produces 2 units of energy for every 1 consumed unit of it.


 Air pumps 

When the outside air temperature ranging between -3 and +10 °C, COP is from 3 to 3.5 digits for air pumps normally. The bigger the temperature is the greater is the coefficient. In the very mild weather, the max rate is 4. However, air pump cannot usually work below -18 °C, representing COP equal to 1 (these models are filled with ammonia as a coolant). On such conditions, it is equal to the efficiency of ordinary air conditioners or electric heaters. If filled with carbon dioxide, COP equal to 1 lowers only down to -30 °C being higher than that with the higher temperature.

COP is applicable normally when considering air-to-air pumps. Talking about air-to-water ones (when the heat is extracted from the outdoor air and is taken to ‘warm floor’, water boiler or heat sinks), COP usually is lower than air-to-air, but not dramatically. Generally, if your winters never have the temperature dropdown below -5 °C, or is stable around 0 °C, you shall expect COP equal to 2.5 … 3 that would allow decreasing your electricity bill from 30% to 75% yearly.

Ground pumps 

The heat pump cost installation of a ground system that is made deep in the soil, for about 6 and more meters (20+ feet), is higher than of air pump. The most part of costs for it is taken for drilling openings. But such systems take somewhere at 44% lower energy than air pumps and about 72% comparing to conventional electric heaters or coolers. The installation cost of this system is the biggest amongst all varieties of heat pumps (ranging from USD 7,000 to USD 20,000 depending on the type and country) with the lower operational costs. Considering the overview of already installed ground systems, the most part of them works normally after 25-30 years after launch with routine maintenance. While the most guarantees are given for 25-50 years of operation, the calculations of their manufacturers show the potentially working lifespan in 50-200 years.

In the payback time, the numbers are variable. Depending on the electricity costs in your residential area, and a type of energizing ground pipes (gas or electricity), your annual heat pump cost savings may be from 20% to 80% percents. It results in 3-10 years of the payback period.

Ground pumps take the heat either from the temperature of the soil in which they are immersed or from the ground waters that may make it work even with 0 °C.

Solar-assist pumps 

These are variations of any other kind of pump, where energy for the operational work is produced by the solar panels connected to it. The obvious con of this is the irregularity of delivering electricity to the pump, but it is solved with the installation of the home-based accumulator, the one, as Tesla does, for example. It will contribute to zeroing the level of consumed external electricity lowering your monthly bill to 100% with the general system’s recoupment in 5-15 years.

Exhaust air 

This type of pumps works being connected to the systems of releasing of exhaust gasses from the building or machinery, which is especially productive in big industrial enterprises. The run of it will cost somewhere about £1 per 1 hour.


Source: https://www.huskyheatpumps.co.uk/


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