What We Did
The existing air conditioning systems serving the space were approximately 15 years old and were reaching the end of their operational life. Due to the age of the systems and the extended operating hours (24 hours a day, 365 days a year), the frequency and scale of repairs had increased over recent years.
It was now time to plan replacement, especially when the potential energy savings and increased reliability were factored in. Using industry standard TEWI (Total Environmental Warming Impact) calculations, Advantage were able to estimate the existing system’s total carbon output over its lifetime, and from that, the total operating costs for the electricity consumed. These calculations incorporated the system’s power input, run time, total refrigerant charge and DEFRA’s figure for CO₂ produced per kWh of electricity generated.
The eight existing IMI systems were each replaced with Daikin infrastructure cooling systems, each comprised of a ceiling mounted cassette indoor unit served by a heat pump outdoor unit. Each of the new systems were configured to produce 10.49 kW of sensible cooling at a room temperature of 22°C db (50% RH) at an ambient temperature of 35°C db. This compared very favorably to the 8.95 kW provided by each of the IMI systems when they were new. The latter figure is likely to have reduced over the lifetime of the systems, as the components age and the systems inevitably become less efficient.
The increase in the total sensible cooling capacity, meant that the cooling load could now be met, even in the very unlikely situation that two systems were to fail simultaneously. Even with the increased amount of cooling available, it was estimated that the upgrade would reduce annual CO₂ emissions by approximately 88 tonnes and reduce the annual running costs by around £14,640 per annum*
It was critical that the DAB transmission equipment remained operational at all times during the project, so a phased programme of works was devised and implemented to ensure that there was sufficient cooling available at all times. Allied to that was the timing of the installation, which was carried out in the early spring in order to avoid the peak ambient temperatures that typically occur later in the year. Each of the eight existing systems were decommissioned and the new systems installed, tested and commissioned one at a time, in order to maintain and control the tight environmental conditions required by the transmission equipment.
The works took a total of six weeks to complete and we’re happy to report that our client was delighted with the results.
Do you have an ageing air conditioning system in need of upgrade? If so, we can provide you with a free energy assessment comparing your current system to a new one to demonstrate your potential savings. To find out more, simply get in touch or call us on 01306 628 282.
*The figures above were estimates only and were based on the systems operating 24 hours a day, 365 days a year, with the compressor running 75% of that time. Carbon output for electricity generation and transmission was based on DEFRA’s figure at the time of 0.53kg/kWh CO₂. The unit cost of electricity was assumed to be £0.09/kWh.