www.heatingandventilating.net
Hot water provision
Above: Andy Green, technical director at Baxi
to legionella control management, there are several ways in which ASHPs can be used. Mid temperature ASHPs can be used with
direct electric water heaters in an all-electric approach to raise the DHW to safe temperatures. As this approach would involve higher volumes of stored DHW, it is important to take into account available space and the weight for the larger cylinders – particularly when dealing with rooftop or non-basement plant rooms. Additional forms of legionella control legionella within the larger volumes of stored water will also need careful monitoring and management. Another option is high temperature ASHPs which are capable of delivering the high flow temperature required to meet the design temperature for sanitary hot water. The major advantage of using high temperature heat pumps is that it avoids the need for an alternative form of technology to store the DHW above legionella temperatures. This brings greater design flexibility as less
space is required, making for a much simpler design and easier installation. However, it’s important to note that the coefficient of performance of heat pumps drops off at higher temperatures, affecting the real-world efficiency and operating costs. With benefits from both options, we are pleased
to be expanding our ASHP portfolio to offer both mid and high temperature ranges.
Point-of-use solutions
Point-of-use electric water heaters should also be considered as an efficient solution to an immediate supply of hot water for washbasins
“Where demand for hot water is high, the design strategy for the system can be one of the main challenges to ensure reliability, efficiency and safety within the project parameters”
and kitchen areas in buildings like schools or GP surgeries, as they only generate energy when required. Installing a point-of-use water heater like the Heatrae Sadia Multipoint that incorporates anti-legionella functionality, water pasteurisation and anti-tamper design, will ensure that water is adequately stored, cycled and distributed.
Calculating embodied carbon
The embodied carbon associated with the manufacture of a product as well its operational
performance is increasingly under scrutiny to reduce the emissions associated with building services. To make it quicker and easier for specifiers
to evaluate and select equipment with lower embodied carbon, sustainably minded manufacturers now provide this data on their products. Baxi, for example, offers free CIBSE Technical Memorandum 65 Embodied carbon in building services calculation documents for its Heatrae Sadia hot water solutions with full Environmental Product Declaration (EPD) documents to be made available for all new products including the new commercial heat pump ranges.
Specialist support
In conclusion, there are any number of options to generate low carbon hot water in new buildings. But achieving an efficient service while
avoiding the risks associated with hot water provision and any site limitations can be a more complex challenge. This is where early conversations with your manufacturer of choice can be beneficial. From specialist technical and product
information to legislative guidance to prefabricated end-to-end solutions, we can work with you to arrive at the best solution every time, taking the pain out of hot water.
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