HYBRID SYSTEMS A
hybrid (or dual fuel) heating system combines a high effi ciency continuous fl ow water heater or a hydrogen ready water
heater with a renewable heating system such as a heat pump or a Solar Thermal arrangement. For projects looking to replace or upgrade their
hot water system with a more energy effi cient and greener solution, then a hybrid system would be an option. A hybrid system provides designers and building owners and managers with the familiarity of the continuous fl ow water heating system with the renewable energy generated by a preheat provided by a heat pump or solar thermal array. The Rinnai Hybrid solution is market leading in terms of energy conservation, as the units will read the temperature of the preheated hot water and modulate the gas input to boost the water to the required temperature. This means that the renewable gains are maximised and the use of natural gas or hydrogen in the future is optimised. For domestic hot water generation the hybrid
system will need to be accompanied by a storage vessel, this vessel is fi lled with preheated hot water that utilises the energy from the renewable heat source as the primary heat source. As the performance of the heat pump can change with the seasons and the hot water requirement for the building maybe beyond the capability of the heat pump alone, the incorporation of Rinnai continuous fl ow water heaters becomes necessary. Consultants and contractors should look to those manufacturers and suppliers with technology that is equipped with smart controls that monitor the incoming water temperature and boost it accordingly. This ensures that renewable heat generated is maximised and the only energy needed is to boost the temperature to the required set point by only using the required amount of energy. This can become important for ensuring temperature of anti-legionella regimes for applications that require hot water above 60 degrees constantly.
Hybrid systems and the road to Net Zero
Hybrid heating and hot water systems are the natural step for the heating industry as the government strives to reduce the reliance on fossil fuels. A hybrid system can meet all objectives in terms of being practical, economic and technically feasible. Rinnai managing director Tony Gittings explains
Progress to the goal of Net Zero needs a bit of
help from common sense and a capacity to stop being partisan about either specifi c products or energy vectors or platforms. There is a need for all products/systems to be designed to work easily and quickly.
The truth of the matter is that hybrid
systems with either heat pumps or solar thermal are the right product – in the specifi c circumstances of the site. Those circumstances also need the site to be accurately evaluated so that the correct size heat pump or solar array deployed. Load demand and seasonal adjustments must be made, and they need to be made realistically based on data. The aim to achieve Net Zero must be governed by maximising and optimising a whole system,
www.heatingandventilating.net
28 January 2023
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