BSEE HEATING & COOLING
On the back of a recordbreaking summer and a winter that seemingly would never end thanks to the ‘beast from the east’, Danny Packham, European product manager – warm air and radiant for Nortek Global HVAC UK, discusses occupancy comfort as we face further extreme weather events
temperatures dipping to a stark - 15ºC and peaking at 35.5ºC, building owners need to ensure they have sophisticated measures in place to manage the comfort of their employees especially considering there is no upper temperature limit for workers. Employers have a duty of care to provide a comfortable working environment for employees. Providing the best experiences for occupants is a top priority for property owners and building managers. Some examples include creating a more comfortable, productive environment by actively measuring and managing temperature, carbon dioxide levels, and lighting levels throughout the building.
A Getting it right
Heating is a necessity and therefore very important that it is done right, therefore the client needs to determine exactly what kind of system they wish to employ i.e. a warm air heating system, a radiant ‘spot’ heating system or a full radiant heating system. Each system has its own benefits and constraints, which are very much dependent upon the building style and proposed use. Most buildings that operate on a closed door policy tend to be suitable for a warm unit heater system which can be conveniently positioned to ensure an even distribution of heat throughout the space. Reznor offers a comprehensive range of gas fired suspended warm air unit heaters from the standard UDSA (11kW up to 97kW) which will suit almost every warm air application.
When used in conjunction with the DS range of destratification fans will help ensure that the whole space is heated and at the same time reducing valuable energy costs by re- using any wasted heat that has gathered within the roof space and returning it to low level.
uExtreme weather events, such as the Beast from the East and the long, hot summer, are pung occupancy comfort in buildings
Where buildings operate an ‘open door’ policy, have poorly insulated buildings or only want to heat a small part of a larger area, then a radiant heating system would be better suited. Reznor’s Vision range of radiant
Adversing: 01622 699116 Editorial: 01622 687031
PLANNING FOR EXTREME WEATHER Finding the right heating and cooling solution
ir conditioning and occupancy comfort is increasingly something that commercial building owners will need to
think about. With 2018
tube heaters radiant heaters focus heat on specific areas and do not heat the air, therefore avoiding heat being wasted as it leaves the building, especially from escaping through permanently open doors. This can result in fuel savings of up to 75 per cent, compared with conventional heating systems in a similar application.
Heating and cooling
Whilst heating a building during the winter is a necessity, cooling a building during the summer is just as important especially to achieve comfortable working conditions, which will ultimately lead to more efficient performance from personnel. However selecting a heating and cooling system, unlike a heating system only, is best suited to those applications that operate a ‘closed door’ policy, otherwise all the effort and more importantly energy, will escape through those open doors.
To achieve a heating and cooling system, Reznor offers two solutions
The Preeva range of gas fired air heaters can provide combined heating and ventilation with the option of cooling. Units are available as either indoor or outdoor models with a wide range of heat outputs and cooling capacities. Air volumes are model dependent but range from 0.47m3
/s up to 3.88m3 /s with external
static pressures of up to 400pa available. When cooling is incorporated within Preeva an external condenser/cooling unit is required.
In addition to the above, models are available with thermal efficiencies above 91 per cent (ncv), or by using models SHH or RHH which have thermal efficiencies above 101 per cent (ncv) making them eligible for Enhanced Capital Allowances (ECA). To reduce on site installation time units are supplied to site pre- assembled and are fully wired. Preeva is ideal when applications have a requirement for heating, cooling and ventilation, as all can be met from a single installation. Thus reducing the time and cost associated with installing separate systems.
RTU is a range of packaged rooftop units (can also be used on the floor outside) that are fitted with heat pumps providing a range of cooling and heating outputs. Additional heat is available by selecting the option gas fired heater section.
Comfort for theatregoers
The benefits to the client will be comfort conditions for the whole environment, customers, and staff at an affordable price. Reznor were able to provide the idea cooling and heating system for Victoria Palace theatre in London.
Theatre owners Delfont Mackintosh wanted to renovate the heating, ventilation and cooling systems to
20 BUILDING SERVICES & ENVIRONMENTAL ENGINEER DECEMBER 2018
uNortek Global HVAC, in conjuncon with the project team, provided the ideal HVAC soluon under the Reznor brand for London’s Victoria Palace theatre
ensure a consistent and comfortable temperature throughout the building. The upper circle could be sweltering in 28ºC while, at the same time the audience in the stalls were cooling their heels in temperatures as low as 19ºC.
The theatre group was shown several technical design options and sketch- up models by the project team, which included architects Buro Happold and contractors, Mechanical Services, to simplify their search for the best matched solution
Nortek Global HVAC, in conjunction with the project team were able to provide the ideal HVAC solution under the Reznor brand which involved the installation of four packaged rooftop units, located on the roof of the theatre. The RTU is composed of air-to- air heat pumps in packaged rooftop configurations with a DX coil and condensers to work as a heat pump to provide both heating and cooling modes, optional preheat via electric or gas fired coils. The range also has various heat recovery options available to maximise efficiency. A key benefit of the Reznor RTU system is that the units can be installed without the need to make any structural alterations to the building.
The four Reznor RTUs provide ventilation to the main auditorium, this air is either tempered or cooled dependant on the required demand. To maximise the efficiency of the system a heat pump configuration was selected to provide both heating and cooling. With indoor air quality being an ever-present driver in modern built environment design, the RTU satisfies occupancy ventilation requirements. The system now provides a comfortable working environment to theatre staff and members of the audience adding to their overall experience. Installed in 2017 the system has really been put to the test through one of the UK’s coldest winters and hottest summers.
www.nortekhvac.com VISIT OUR WEBSITE:
www.bsee.co.uk
‘
Providing the
best experiences for occupants is a top priority for property owners and building managers. Some examples include creang a more comfortable, producve environment by acvely
measuring and managing temperature, carbon dioxide levels, and lighng levels throughout the building.
’
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
