Presentation Title Date xx, 2004

1
REGIONAL ADMINISTRATION BUILDING IN COIMBRA,
PORTUGAL Prof. Anibal De Almeida, João Fong,
André Quintino, Anabela Carvalho ISR - University
of Coimbra
Building and Use
Heating Cooling System (cont.)
Heat Pump
Fan Coils Coadis 2 fancoil units, also
manufactured by CIAT, were selected due to their
high heat-exchanger efficiency, high performance
of the fan and high efficiency of the brushless
permanent magnet motor with variable speed
control.
building photo
heat pump photo
Thermal Storage
The building is heated and cooled using the
ground source heat pump prototype developed by
CIAT for the Ground-Med project. CIAT HP
CAPACITY 70 kW Refrigerant R410A Compressors
tandem of On/Off scroll compressors Heat
exchangers brazed plates manufactured by CIAT
Water reversible to always be
counter current Expansion device electronic
expansion valve
A latent heat thermal energy storage (LHTES) will
be coupled to the GSHP. This will help reduce the
electricity costs taking advantage of variable
electricity rates while helping the grid to
overcome the intermittent output of renewable
energy The storage unit will consist of a tank,
with a total volume of 3m3 filled with 400
containers of a Phase Changing Material (PCM)
resulting in a storage capacity of 100kWh. The
selected PCM is a hydrated salt (sodium
thiosulfate pentahydrate) with a melting point of
46ºC and a heat of fusion of 190kJ/kg.
Coimbra Heat Pump full load performances for
cooling
Conditions Cooling mode Cooling mode Cooling mode Cooling mode Cooling mode Cooling mode Cooling mode
Conditions Evaporator Evaporator Condenser Condenser Cooling capacity EER Eurovent Class A
Conditions Inlet Outlet Inlet Outlet Cooling capacity EER Eurovent Class A
EUROVENT 12C 7C 30C 35C 56 kW 5.05 gt 5.05
Coimbra demo site 15C 10C 25C 30C 63.5 kW 6.19 n.a.
Distribution of air-conditioned spaces
This building is located in Coimbra of Portugal
and concerns an old milling factory which was
recently renovated and transformed into an
administration building. This building is now
used for public services housing offices for
specific purpose. Total area of building
3250 m2 Conditioned area
586 m2 Aver. annual air temperature
15.1 ºC Aver. annual  air
 relative  humidity 77
Heating power demand for level 3 34
kW Cooling power demand for level 3 48 kW
Coimbra Heat Pump full load performances for
heating
Conditions Heating mode Heating mode Heating mode Heating mode Heating mode Heating mode Heating mode
Conditions Evaporator Evaporator Condenser Condenser Heating capacity COP Eurovent Class A
Conditions Inlet Outlet Inlet Outlet Heating capacity COP Eurovent Class A
EUROVENT 10C 40C 45C 61 kW 4.58 gt 4.45
Coimbra demo site 15C 35C 40C 70.4 kW 5.65 n.a.
Thermal storage tank (source PCM)
Data Acquisition System
Borehole Heat Exchanger
  water flow used on the condenser side for
Eurovent conditions in cooling test should be
used to determine this value   water flow used
on the condenser side for demo site in cooling
conditions should be used to determine this value
Heating Cooling System

• Water temperature conditions
• Cooling (In/Out) 15 / 10 oC
• Heating (In/Out) 35 / 40 oC
• Hydraulic Loop Description
• This loop pumps the fluid to the fan coil units
  and comprises the Thermal Energy Storage tank and
  hydraulic circuit. It is basically composed by
  the following elements
• Very high efficiency circulating pumps
• Monitoring elements temperature-, flow-,
• pressure meters
• Thermal storage tank 3,000 l tank
• Buffer tank
• Valves, filters, etc.
• A simplified schematic of the loop is shown
  below

Internal hydraulic loop