Typical underfloor heating arrangement (Reproduced with permission from Nu-Heat, UK)

heating in general usually needs a less sophisticated electronic controller than a radiator-based system, simply because it involves much greater thermal masses and, therefore, much slower changes in temperature.

DHW supplies can become more reliable if a so-called triple function system is specified. This uses a dedicated second internal refrigerant to water heat exchanger to supply heat to the DHW tank/thermal store. To make economic sense when running entirely on electricity from national grids, heat pump installations are normally sized to produce less than 100% of the building's DHW and space heating and cooling needs, although the ideal percentage is unique to each location and each project and is very dependent on current and projected energy prices. When renewable energy is involved the equation can look very different.

Heat pump performance continues to improve, with vapour compression pump COPs now topping four for the inherently more efficient ground source variant. The latest versions are quiet, reliable and compact, and prices are increasingly competitive as more manufacturers enter the market. Serious consideration should be given to heat pumps for almost every building project - especially in combination with other technologies (see Chapter 16).

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

Get My Free Ebook

Post a comment