Design of HVAC systems for bld 3862 – LHCb control room and for bld 2885 – LHCb new workshop

The Building 3862 is located adjacent to the existing hall SX8. It has a total surface of ~1100 m 2 and it is composed of:  A control room of 280 m 2 on the ground floor;  A meeting room of 155 m 2 on the first floor;  Three offices of 62 m 2 together on the first floor;  A small room ~5 m 2 for the IT star-point;  Toilets;  Hallways and coffee rooms;  A control room for the LHC cryogenics group of 54 m 2 on the second floor;  Four offices of m 2 together on the second floor.

Indoor conditions Internal thermal loads Name of premises Location of served premises TemperatureHumidity Technical room (*) Underground Winter 21°C ± 2 KNot controlled LHCb - Control Room Ground floor Summer 24.5°C ± 1.5 K Winter 22°C ± 2 K 50% ± 10% Meeting room 3 Offices First floor Summer 25°C ± 2 K Winter 21°C ± 2 K Not controlled Cryogenics - Control Room Second floor Summer 24.5°C ± 1.5 K Winter 22°C ± 2 K 50% ± 10% Facilities Ground and first floor Summer 25°C ± 2 K Winter 21°C ± 2 K Not controlled Location of served premises Name of premises Thermal loads [kW] Maximum number of people Underground Technical room25- Main Technical Gallerynot considered Ground Floor LHCb Control Room2535 Facilities11- First Floor Meeting room Offices58 Facilities9- Second Floor Cryogenics Control Room 76 Facilities & Othernot considered Future LHCb needsnot considered TOTAL96

Total winter thermal losses Winter heat loads, calculated as per EN ISO and EN ISO 13790, are about ~30 kW as losses through the building envelope. Total summer heat loads Summer heat loads have been calculated as per ASHRAE Handbook RTS Method. Total summer heat load is about ~140 kW.

The building is heated and cooled by a VRV system and ventilated (fresh air) by a dedicated AHU.

VRV system 5 outdoor units 40 indoor units 10 room remote controller 1 central remote control

VRV system See drawings

Why a VRV system? VRV system (heat recovery type): -provides user with the ability to maintain individual zone control in each room and floor of the building; -can operate simultaneously in heating and/or cooling (just one heat recovery unit can provide both heating and cooling for each room); -allows heat recovery from one zone to another (estimates range from 11% to 17% less energy compared to all-air systems); -is able to respond individually to fluctuations in space load conditions (it means that the user can set the ambient temperature of each room as per his/her requirements and the system will automatically adjust the refrigerant flow to suit the requirement). It keeps temperature fluctuations to minimum (+/- 1F).

Why a VRV system? -The modular concept makes it easy to adapt the HVAC system to expansion or reconfiguration of the space; -VRF systems are lightweight; require less outdoor plant space and offer space-saving features; -Because ductwork is required only for the ventilation system, it is smaller than the ducting in standard systems (it needs little space for pipes and accessories installation); -Reduced noise level. -Because there are no water pumps to maintain or air ducts to be cleaned, less maintenance is required compared to other technologies.

Why not an all-air system (standard system)? -Little or no space between false ceiling and ceiling (first and second floor) for ducts installation -Little space on the roof for the positioning of AHUs -No hot water available for heating (hydronic system precluded)

CV Works: Started on 15/01/2015 Ended on 30/06/2015 Total cost of the HVAC installation: euros euros (HVAC 2 nd floor) Additional costs: euros (drinking water connection, boiler, etc.)