Post on 02-Jan-2016
Thermal Storage Coupled to a Ground Source Heat Pump in
a Public Services BuildingCOIMBRA
Andre Quintino Duarte
Oradea, 06 June 2012
Demonstration Building
Total area: 3250m2
Four floors
Two public services installed
Offices, laboratories, conference room
Capacity for 250 permanent workers + 72 temporary people in a conference room
Located close to a river
“Fábrica dos Mirandas”
Demonstration Building
• The heated /cooled spaces are located in level 3 of the building (last floor).
• 22 rooms (offices)• Approximately space conditioned area 600 m2
Thermal Solution• Before 2012: Air Conditioning
– Low Efficiency;– Noisy;– Outdated technology;– COP between 2 and 3.
• February 2012: Ground Source Heat Pump (GSHP)– High Efficiency;– Very Silent;– New technology;– COP between 5 and 6.
• November 2012: GSHP + Thermal Storage– Increase Efficiency;– Avoid Expensive Electricity Periods;– Reduce Building Footprint.
Thermal Storage• The thermal storage tank is to be located in a room
adjacent to the machinery room. It is planned to have a volume of 3.5m3 (40% water + 60% PCM).
• Research is being conducted with the support of the Fluids Thermal Transfer Group of the Department of Mechanical Engineering on the best design of the tank to ensure optimal heat transfer and to ensure that the storage maximum capacity of the PCM modules is used.
• It was found that the most suitable material would be the S46 salt hydrate from PCM products Ltd (UK)
Thermal Storage Tank
Tank Dimensions:1,5m; 0,8m; 3m (H; W; L)
With a Thermal Capacity of 100 KWh.
(Currently under construction)
To be installed late this year in November.
Electricity Price in Portugal
Period Period Electricity Prices Peak Power Prices
Peak Period9 AM to 10:30 AM6 PM to 8:39 PM
0,2078 €/kWh 0,4025 €/kW
Middle Peak Period8 AM to 9 AM
10:30 AM to 6 PM 0,1112 €/kWh -
Off Peak Period10 PM to 2 AM6 AM to 8 AM
0,0732 €/kWh -
Special Off Peak Period
2 AM to 6 AM 0,0680 €/kWh -
0:00
0:45
1:30
2:15
3:00
3:45
4:30
5:15
6:00
6:45
7:30
8:15
9:00
9:45
10:3
011
:1512
:0012
:4513
:3014
:1515
:0015
:4516
:3017
:1518
:0018
:4519
:3020
:1521
:0021
:4522
:3023
:15
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
Typical Electrical Consumption
Hours
Ele
ctri
cal
Po
wer
(kW
)
Heat Pump• Reversibility is done on the
water side in order to always be in counter current on the heat exchangers.
• This is achieved by 3-way motorized valves
CondEvap
Simplified Schematics of the Hydraulic Installation
75 mm Diameter PPR Pipes in the main sections
Thermal Storage