Ventilation systems
manufactured in Britain – another factor in the Hospital’s decision-making process.
Technical specification Each TurboChill machine provides 600 kW of chilled water at 5.5˚C flow, and 11˚C return, with a very high seasonal efficiency (ESEER of 5.0 and EER of 3.74). The units require a 400 V/3 Ph/50 Hz
electrical supply with an electrical input of 160 kW, with a FLC (full load current) of 254 A, and a very low individual compressor starting current of just 2 A. The overall dimensions of each unit are 6,675 mm long by 2,200 mm wide by 2,600 mm high, with each weighing 5,680 kg. The refrigerant in thesemachines is non-ozone depleting refrigerant, R134a.
Pros and cons Henderson Green outlined the advantages and disadvantages of all three of the chiller options in its appraisal to ensure that the hospital was fully informed before making its decision. Below is an overview of the ‘pros and cons’ of the TurboChill:
Advantages Infinite capacity control. Most compact plant. Best seasonal efficiency (EER & ESEER), and therefore the lowest CO2
emissions.
Completely oil-free compressor technology.
Low noise. Very low maintenance (only a small number of moving parts).
The lightest of the electrically-driven machines.
Smallest power supply required, and no high starting current.
Lowest annual energy consumption and running costs.
Disadvantages Highest capital cost, and same installation cost as the second option.
New technology necessitated additional training of maintenance engineers.
A ‘complete package’ Specifying new technology for a healthcare facility requires a detailed analysis and complex integration of the technology into the Hospital’s systems, and Henderson Green successfully pioneered this at Basingstoke and North Hampshire Hospital as the Trust’s lead consultant – from feasibility through to completion of the installation. The NHS Trust project team managed the process. Henderson Green’s team comprised Allen Holmes as CDM (Construction, Design, and Management) co- ordinator, a statutory
62 Health Estate Journal September 2013 This was a fantastic project to work on,
since we were able to offer the hospital much more than just a consulting engineer role.We oversaw the whole process as contract administrators and low carbon consultants. The Airedale chillers were double the price of the alternative options, and it was the first time that one of our clients has gone down the route of choosing the most expensive solution. This was a classic case, as with many hospitals, of where the thermal loads are being controlled well, but the electrical load is increasing, because of the air-conditioning required for all the electrical equipment. Once hospitals exceed the maximum demand, the metering kicks in, which makes reducing electrical consumption essential. Since the installation at Basingstoke and North Hampshire Hospital, however, the chillers’ electricity consumption has fallen by about 40%.”
A bird’s eye view of the Airedale TurboChill air conditioning units installed at the Basingstoke and North Hampshire Hospital over a year ago. Henderson Green encouraged the Hospital to look at the units’ lifecycle costs, rather than focusing purely on the initial investment involved.
requirement for every major capital project, and ScottWilson, as structural engineer.
‘Spend now, save later’ There are countless ways that hospitals can use energy more efficiently to reduce consumption, many at no, or low, cost. The installation of new air-cooled chillers at Basingstoke and North Hampshire Hospital is an encouraging example of how a decision to sow for the future, despite substantial capital costs, reaped both instant and long-term benefits for both the hospital, and the environment.
Expertise required Luke Broadbent, the Hospital’s project manager, said: “Replacing the chillers was not only an urgent issue, but equally one which we knew would require the expertise of an external consultant. It was imperative that the hospital reduce its power load, as we were getting very close to reaching our available electrical capacity, and knew Henderson Green would be able to provide a sustainable solution that would bring about this reduction. “Our decision to go with the Airedale
TurboChill was testament to our desire to optimise lifecycle costs over the life of the plant. Taking a ‘short-term’ capital cost view can be tempting, but Henderson Green assisted us in looking ahead to see the bigger picture for both the hospital and the environment. Having been in place for over a year now, the new chillers have revolutionised the provision of cooling to the main operating theatres, and calculations suggest a saving of up to £16,000 per year. This makes it simple to see how, in a relatively short time, the chillers will pay for themselves.” An Airedale spokesperson
The technology behind the new Airedale TurboChill is designed around the ‘revolutionary’ centrifugal Turbocor compressors, which are reportedly low cost to use, require minimal maintenance, and produce low carbon emissions. The oil-free compressors are also described as ‘practically silent in operation’.
added: “This is an excellent example of how our TurboChill units have met both the bespoke needs of this clinical setting, and the hospital’s requirement to reduce its energy consumption. Henderson Green’s involvement meant the hospital’s decision- making process was not only streamlined, but also more informed, and, of course, that the Trust’s team looked at the lifecycle cost of the installation, rather than simply focusing on the capital investment entailed.”
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114 |
Page 115 |
Page 116 |
Page 117 |
Page 118 |
Page 119 |
Page 120 |
Page 121 |
Page 122
