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Climatization Systems and Sanitary Hot
Water in Energetic Certification of Buildings-A
Claudia Ribeiro Pacheco FFP* and Jose Pacheco de Carvalho AR
Department of Physics, Applied Physics and Telecommunications Research Group, Universidade da Beira Interior, Portugal
Submission: January 15, 2021; Published: January 20, 2021
*Corresponding Author:Claudia Ribeiro Pacheco FFP, Department of Physics, Applied Physics and Telecommunications Research Group, Universidade da Beira Interior, 6201-001 Covilha, Portugal
How to cite this article: Claudia R P F, Jose P d C A. Climatization Systems and Sanitary Hot Water in Energetic Certification of Buildings-A Case Study.
Civil Eng Res J. 2021; 11(2): 555809. DOI:10.19080/CERJ.2020.10.555809
Calculation procedures have been developed, considering the thermal project of a building under study, for simulation of several combinations of heating and cooling climatization systems and conventional systems of sanitary hot water production. Comparisons are made for the values of annual greenhouse gas emissions, annual and monthly energy bills of climatization and sanitary hot water preparation, energy class and the cost of acquisition, installation, and maintenance of equipment.
Keywords:Climatization systems; Sanitary hot water; Energetic certification of buildings
The transposition of Directive 2002/91/ EC , made it possible to compare energetic performance of buildings in different State Members of Europe, based on mutually established parameters . To meet energy requirements, minimum requirements, air quality and energy class, an integrated analysis of both architectural and equipment solutions becomes relevant . In buildings, there are several solutions, which lead to different energy performances. However, it is not necessarily mandatory that a low energy bill corresponds to a good energy rating [3,4].
The building of our case study was a detached single-family home . The systems analyzed included a set of air conditioning (heating and cooling) and SHW production equipment available locally and currently used in single-family housing buildings. Ten solutions were analyzed, S1 to S10. Briefly we have:
a.S1-Standard system, comprising a heating system composed of electrical resistances, a cooling system composed of a refrigerating machine with a performance coefficient of 3 and a SHW production system through an electric water heater with 50 mm of thermal insulation in buildings without gas supply, or through a natural gas or LPG heater when the supply is foreseen.
b.S2-Heat pump / Refrigerating machine for heating / cooling and natural gas boiler for SHW.
c.S3-Heat pump / Refrigerating machine for heating / cooling and electric water heater for SHW.
d.S4-Heat pump / Refrigerating machine for heating / cooling and heat pumps for SHW.
e.S5-Butane gas wall boiler for heating and instant SHW.
f.S6-Wall-mounted natural gas boiler for heating and instant SHW.
g.S7-Wall-mounted natural gas condensing boiler for heating and instant SHW.
h.S8-Diesel floor boiler with accumulation for condensation and SHW by accumulation.
i.S9-Biomass boiler for heating and wall-mounted natural gas boiler for SHW.
j.S10-Biomass boiler for heating and SHW with accumulation.
To compare the air conditioning and SHW production
solutions in the house under study, the following performance
indicators were selected for new buildings: Energy rating, where
the energy rating scale for buildings or building fractions is made
up of 9 classes, in line with the provisions of EN 15217 ;
CO2 emission rate; Energy bill; Return on investment period.
This work has shown that the impact of climatization and
SHW systems on Energy Certification is very significant. A
building that combines exceptional insulation conditions may
have very different energy classes, depending on the adopted
climatization solution, varying from B- to A +. In the case of an
“existing” building, with poor thermal insulation conditions, in
breach of the minimum thermal quality requirements, it may have
a high energy class, only disguised by the appropriate choice of
equipment. It is possible to reconcile a low annual CO2 emission
with a low energy bill. However, another important aspect to
consider is the cost of installing the equipment. It is possible to
reduce the CO2 emission rate and, consequently, obtain a good
energy class, which does not necessarily imply a low energy
bill or a low installation cost. The solutions that presented the
lowest energy bill were: S2) Heat pumps/refrigeration machine
for climatization and natural gas boiler for sanitary hot water,
S3) Heat pumps/refrigeration machine for climatization and
electric water heater for sanitary hot water, S4) Heat pumps for
climatization and sanitary hot water. Solution S3 is penalized in
terms of CO2 emissions, so solutions S2 and S4 are more favorable.
However, solution S4 has a higher installation cost, compared to
solution S2 and a longer simple payback period.
Some conclusions can be highlighted: The performance
indicators analyzed are relevant parameters in helping to
decide on the climatization and support systems for SHW to
be implemented. The most appropriate balance between the
various indicators must be technically justified in order to enable
the decision maker to choose the most convenient solution, its
advantages and disadvantages. The weight of the climatization
and SHW production systems, both in the energy bill and in the
energy classification, is very significant, and it is recommended
that the decision on these systems be evaluated by the different
specialties involved. A good energy classification, with reduced
CO2 emission rates, does not necessarily correspond to a lower
Isolani P, Comini, R, Clement F, Puente F, Orlandi A et al. (2008)Energy efficiency in residential buildings. Deco editions, Lisbon, Portugal.
(20120) Pacheco, Cláudia FFPR. Impact of Climatization and DHW Systems on Certification Energetics of Buildings under the RCCTE: Case Study, M. Sc thesis, University of Beira, Interior, Covilha, Portugal.