Small pre-assembled family like house at CESI RICERA
A small pre-assembled building available for experimental activities at CESIRICERCA facilities in Milan, has been equipped with a water-to-water electric heat pump. Underground water has been used as the heat source. The water is pumped by a submerged electric pump placed at about -25 m. The heating/cooling plant has been working for a year in order to continously monitor its behaviour in realistic conditions, along a complete summer/winter season.
| Country | Italy |
| City | Milano |
| Client name | CESI RICERA |
| Application area | Building sector |
| Building type | One-/two-family house |
| Year of construction | 1997 |
| Heat source/sink | Water/Water |
| Heat pump type | Electric heat pump |
| Year of installation | 2006 |
| Purpose | Heating and cooling |
| Heat source system | Aquifer/wells |
| Operation mode | Monovalent |
| Refrigerant | R22 |
| Contact name | Walter Grattieri |
| Contact E-mail | walter.grattieri@cesiricerca.it |
| Contact website | http://www.cesiricerca.it |
| Supported by | RdS Fund, Research for the Italian Electric System |
Project description
Building, overall energy concept
- Small pre-assembled family like house, built in 1997, Surface= 61 m2, S/V=1.22,
average U-value= 0.60 W/m2/K (includes walls and windows)
- Heated/cooled area= 60m2, n.1 storey
- Location: Milan, Italian climatic zone E, degree days (heating) = 2404, design outdoor/indoor temp= -5/+20°C
- Calculated annual heating/cooling demand: 6.250 kWh heating (constant internal temp. 20°C), 3.450 kWh cooling (constant internal temp 24°C)
- Design heating/cooling peak load: 4,40 kW heating, 3,45 kW cooling
- Ambient heating and cooling by electric heat pump only
- Distribution system: hydronic circuit with fan coils; supply/return temp: 16/10°C cooling, 35/30°C heating
Heat pump system
- Water-to-water heat pump, Climaveneta model HRNH 0011electricity driven, heat source: water, heat sink: water
-Heating and cooling capacity: 6,2 kW winter, 5,5 kW summer (nominal values at standard conditions)
- Operation mode: continuous
- Refrigerant R22
- Heat source: underground water at roughly constant temperature, +16°C, in summer and winter
Operation experiences
Since the heat-pump is a little oversized for the experimental building, the internal temperatures has been kept higher in winter, and lower in summer, than the design values, in order to have a more regular operation of the heat-pump.
No operation or maintenance problems have been found with the heat-pump, but quite serious fouling problems have been met with the submerged pump and its circuit. Notwithstanding frequent cleaning of the filters and tubing, the pump has progressively lost efficiency and increased its electricity consumption, at the same flow conditions; as a consequence the SPF has a lower value than would have been possible if pump efficiency remained good.
Costs, economic efficiency, incentives
No information available.
Regulations, guidelines, benchmarking
No information available.
References
Report (in Italian language) on the monitoring campaigns available on CESIRICERCA website.
| Design value | Measured data | |
|---|---|---|
| Year1 | 2006 | 2006 |
| Heating capacity (kW) | 6,2 | |
| Cooling capacity (kW) | 5,5 | |
| COP (Heating, appliance)2 | 4,50 | 4,41 |
| EER (Cooling, appliance)3 | 15,63 | 15,49 |
| SPF (Heating)4 | 3,21 | |
| SEER (Cooling)5 | 3,91 | |
| Annual heat delivery (kWh/year)6 | 8.206 | |
| Annual cooling delivery (kWh/year)7 | 2.178 | |
| PER (Heating /Cooling)8,9 | 1,25 |
1 Heating and cooling season
2 at 30/35°C fan coils side, and 16/10°C well side
3 at 16/10°C fan coil side, and 16/26°C well side
4 including auxiliary equipment electric consumption
5 including auxiliary equipment electric consumption
6 constant internal temperature 23°C
7 constant internal temperature 22°C
8 Primary Energy Ratio: Useful heating (and cooling) energy delivered / primary energy input (kWhUE / kWhPE)
9 Energy conversion factor: 2.559 kWht/kWhe
| Institution/Company | CESIRICERCA SpA |
| Responsibility/Function | ESE |
| Street/PoBox | via Rubattino 54 |
| ZIP | 20134 |
| City | Milano |
| Country | Italy |
| Contact Person | Walter Grattieri |
| Phone/Fax | +39 02 4674 5714 |
| grattieri@cesiricerca.it | |
| Website (URL) | http://www.cesiricerca.it |
