heating

Brazilian researchers have proposed a new mathematical model to change parameters for wind and solar resources and different levels of energy demand. The model was originally conceived for tropical regions, but it can actually be used in any location. The new methodology models a highly complex system featuring wind turbines and PV modules, as well as solar collectors, fuel lines, gas boilers, engine-generator sets, recovery boilers, absorption and compression chillers, and grid electricity.

Researchers in Spain have proposed two control strategies for the integration of heat pumps in district heating systems assisted by solar thermal collectors. Their technical-economic analysis shows that the proposed combination can reduce reliance on gas while also reducing costs.

A Norwegian consortium has built an industrial heat pump that can reach a temperature of up to 180 degrees Celsius. The machine can be used with different industrial processes that rely on steam as an energy carrier and can reduce a facility’s energy consumption by between 40% and 70%, as it enables the recovery of low-temperature waste heat.

The PV-powered geothermal heat pump system was tested for a year, with measurements taken by Researchers at the University of Nottingham. The UK group showed it was able to maintain an indoor temperature over 16 Celsius degrees in all seasons, except for winter.

Two Italian experts on heat pumps and PV systems recently spoke to pv magazine about economies of scale, the European market, and the maturity of heating tech. The Eurac researchers said currently available heat pumps can run at -20 C and efficiently provide hot water up to 65 C.

According to a Swedish-Austrian group of scientists, the combined use of heat pumps and rooftop PV generation may be boosted in Europe by replacing current subsidies with a carbon tax policy. Their analysis showed that the profitability of this combination is strictly dependent on gas prices, and that a slight increase in gas prices would be crucial to sustain strong development.

The Scottish government wants to deploy renewable-powered heat pumps on at least 1 million homes and 50,000 non-domestic buildings by the end of this decade. For this purpose, it has created an advisory group and is now seeking to gather all potential stakeholders.

Building renovations may result in up to 51% space heating demand savings, according to recent research from Germany. Its authors claim that, if buildings are retrofitted and thermal energy storage and individual hybrid heat pumps with back-up gas boilers are applied on a large scale, significant heat cost reduction may be achieved across the whole of Europe.

The Polish government is supporting a hybrid renewable energy project based on a deep-borehole heat exchanger (DBHE) whose heat pumps are powered by photovoltaics. The heat generated by the facility will be used for district heating.

Swedish energy company Vattenfall is planning to build a 150 MW electric boiler near Amsterdam under the Netherlands’ SDE+ program for large scale renewables. The facility is planned to operate when a lot of electricity from wind and sun is available and to supply hot water to households in the city and its surrounding areas.