Commercial heating
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Practical and sustainable
(BEIS), heating, cooling, ventilating and providing hot water and lighting for the built environment makes business the third-largest emitter, at 17%, of greenhouse gasses in the UK. While studies show that over the next
A
two decades renewable energy sources (RES) - a mix of district heating, heat pumps, wind and solar energy - will be crucial to the energy supply in the heating market, we would lean towards more technology-open scenarios that not only predict large proportions of heat pumps, but also assume the use of gaseous fuels. Just as electricity is becoming greener so too can the gaseous fuels which will contain larger shares of renewable ‘green’ hydrogen gas and other synthetic fuels by 2050. This supports the adoption of a hybrid approach, which we not only see as more practical, but is both cost-effective and less influenced by the volatility of a RES electricity only approach.
Why take the hybrid route?
As is so often the case in the commercial world, each project will have its own specific requirements, necessitating a more bespoke approach to the provision of hot water, heating and power generation. Simply opting for heat pumps, providing
a lower grade of heat, will not be a practical alternative in most commercial scenarios. One answer then is to use a combination of two or three technologies to provision a high heat, low cost system. So, let’s consider the advantages of the
hybrid approach, which, at the most basic for heating systems consists of two heat generators, of which at least one is operated with renewable energies and one with fossil fuel. Often, a hybrid heat pump system consists of a heat pump (air source) designed for a system part load (baseload) and a gas condensing boiler for
22 November 2019
peak load, for example during the cold, winter months. In a fully hybrid heat pump system, both heat generators can cover the entire heating load, where the energy sources can be freely selected according to definable criteria including efficiency, emissions and price. Compared to a conventional combustion heating system a hybrid system will require two heat generators and two energy connections, meaning even when there is a pre-existing gas connection, there will be issues of logistics, space requirements and a higher complexity of the plant. That requires more effort and expertise from the system designer, supplier and installer which leads to a 50% to 60% higher CAPEX cost compared to a pure condensing heating system. So, what are the advantages that outweigh these initial costs? A hybrid heat pump/gas boiler system is able to reduce the maximum power consumption of a system
Adveco CHP servicing in progress
by smartly balancing the heat generators for greater efficiencies and lower operational costs whilst guaranteeing high system temperatures to ensure the comfort of those still living or working in the building during refurbishment work. If the hybrid system is also equipped with a buffer tank and domestic hot water (DWH) tank the heat pump can achieve a high
ccording to 2019 figures issued by the Department for Business, Energy and Industrial Strategy
The graphic represents a hybrid heat pump system consisting of an air source heat pump designed for a system part load (baseload) and a gas condensing boiler for peak load
Bill Sinclair
To secure climate-neutral building stock by 2050, commercial organisations desperately need help to achieve practical and cost-effective sustainability, according to Adveco technical director Bill Sinclair
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