👉Chandigarh Call Girls 👉9878799926👉Just Call👉Chandigarh Call Girl In Chandiga...
Valsuani - 15° Convegno Europeo CSG
1. ISAHP: INTEGRATED SOLAR ASSISTED HEAT PUMPS
OPERATED WITH ISOBUTANE (R600A)
L.A. Tagliafico, F. Scarpa, G. Tagliafico, F. Valsuani, C. Rossi
Dott. Ing. Federico VALSUANI
From conception to prototype
Fiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento 1
2. SYSTEM DESCRIPTION - ISAHP
The direct expansion
integrated solar assisted
heat pump (ISAHP) water
heater consists of a Rankine
refrigeration cycle where
unglazed flat plate solar
collectors act as an
evaporator for the refrigerant
(R600a).
The condenser is coupled
with a water storage tank in
order to cover the energy
user demand.
innovative device for building integrated applications
Fiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento 2
3. Purpose:
• Increase the panel efficiency
keeping the panel temperature
lower than traditional solar
system; flusso utile
FLUSSO UTILE [W/m2]
• Increase the COP of the heat pump 800
working with higher evaporator
temperature; 600
W/m2
tradizionale
400
innovativo
• Reduce the panel costs using 200
unglazed panel.
0
5.30
7.30
9.30
11.30
13.30
15.30
17.30
8 novembre 2005 DIAGNOSI E CERTIFICAZIONE ENERGETICA DEGLI EDIFICI 3/35
4. EFFICIENCY - ISAHP
G=800W/m2, h=10W/m2 °C)
G=800W/m2, h=10W/m2 °C
TRADITIONAL SOLAR PANEL
lower panel temperature and
lower heat losses toward the ambient
Higher efficiency
Integrated panel efficiency
Traditional panel efficiency G=900W/m2, U=15W/m2 °C
𝜀𝐺 − ℎ ∆𝑇
𝜂=
𝐺
PSIPC
Fiera Rho Milano, 28/03/2012 L.A. Tagliafico, F. Scarpa, G. Tagliafico, F. Valsuani, C. Rossi 4
5. FLUID – R600a
A full design has been performed and R600a
resulted the best operating fluid.
The use of natural refrigerants, such as R600a – isobutane, is interesting for its low
environmental impact (ODP = 0, low GWP) when used in a high efficiency system
(low energy consumption, low TEWI) .
The range of pressure and Temperature of R600a fits the working condition of R134a
systems.
The use of R600a is consistent for small and medium device because of the
explosive hazard for bigger devices.
CE 1272/2008: Isobutane - Category 1 - H220 (High flammability)
Lower Explosion limit (LEL) 1.5 % Approx 38 g/m3
Upper Explosion Limit (UEL) 8.5% Approx 203 g/m3
Minimum ignition temperature 460 °C
Fiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento 5
7. ISAHP - PROTOTYPE
The prototype built at DIME – University of
Genoa is composed of:
• Variable speed volumetric compressor (6 cm3)
• Pulse modulated electronic expansion valve
• Water condenser
• Bare steel solar panel (evaporator) (1m2)
The solar evaporator is made of a copper coil
(din=8mm, dext=10mm, L=30m, A=0.75m2)
welded on an steel plate in which the R600a
flows.
Patent n. 1371944 (22.03.2010)
Fiera Rho Milano, 28/03/2012 7
8. ISAHP – PST comparison
The PSIPC system has been installed coupled with a traditional solar thermal
system (PST) in order to cover the hot water and heating load of a dressing room.
This design solution allow to compare the instant power and the thermal energy
generation of the two devices.
Fiera Rho Milano, 28/03/2012 8
10. USER LOAD COVERAGE- ISAHP
Traditional solar panel
PSIPC
Comparison between user load coverage of the ISAHP (new) and a thermal panel (Traditional solar panel)
Annual average user load coverage (reference load = 4964 MJ/m2year
ISAHP = 34%
Traditional thermal collector = 13%
Fiera Rho Milano, 28/03/2012 10
11. PRIMARY ENERGY SAVING - ISAHP
Primary energy saving index as a function of the COP for four representative months – simulated data.
Red Line – Compressor Limits of the operative condition of the PSIPC machine.
Fiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento 11
12. CONCLUSION - ADVANTAGES
Main advantages in comparison to traditional
system:
• The PSIPC prototype has been realized
using R134a components but charged with
R600a as refrigerant fluid. Good
adaptability has been found.
• Higher solar panel efficiency (0.7-0.9 );
→ the solar panel is kept at lower
working temperature
• Higher heat pump COP (6 ÷ 8.5);
→ higher evaporator working temperature
• Lower solar panel cost
→ bare steel plate, no glass cover
Fiera Rho Milano, 28/03/2012 12
13. PSIPC – Water to water system
Wcomp storage tank
collectors 3 (4) 5 Tuser
User: Public swimming pool
Quser
Qevap compressor Power: 150 kW HP
E
Qint Panel surface: 400m2
Tp Qcond
Date: 2011-2012
Water loop Refrigerant loop Domestic water
2 1
Fiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento Page 13
14. PVT-SAHP
User: Test rig
Power: 220 Wp +
Panel surface: 1,6 m2
Date: 2011-2012
Wc
Tamb
A Qlost compressor
A Qevap Qc
th) USER
PVT panel
T
H
Wel Condenser
el)
Expansion valve
Fiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento Page 14
15. Thanks for the attention
University of Genoa, the research Group:
L.A. Tagliafico - tgl@ditec.unige.it
F. Scarpa - federico.scarpa@unige.it
G. Tagliafico - giulio.tagliafico@unige.it
C. Rossi - cecilia.rossi@unige.it
F. Valsuani - federico.valsuani@unige.it
3TC Engineering Srl
Via Adamoli, 401
16165 Genova
Tel. 010.836.22.04 - Fax 010.836.10.94
e-mail: info@3tcsrl.it web: www.3tcsrl.it
Fiera Rho Milano, 28/03/2012 Le innovazioni Tecnologiche nel Freddo e e nel Condizionamento Page 15
