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BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI
Publicat de
Universitatea Tehnică „Gheorghe Asachi“ din Iaşi,
Tomul LVIII (LXII), Fasc. 4, 2012
Secţia
CONSTRUCŢII DE MAŞINI
THEORETICAL ECO-EFFICIENCY COMPARATIVE STUDY
CASE, HYDROCARBONS, AMMONIA AND HFC MIXTURE
ALTERNATIVES RETROFIT
BY
GRAŢIELA MARIA ŢÂRLEA ∗2 , ION ZABET 1 , MIOARA VINCERIUC 2
and ANA ŢÂRLEA 2
1 Romanian General Association of Refrigeration of Bucharest
2 Technical University of Civil Engineering of Bucharest
Received: September 20, 2012
Accepted for publication: November 10, 2012
Abstract. Several natural refrigerant alternatives are compared on the basis
of their cycle coefficient of performance and TEWI factor (Total Equivalent
Warming Impact – in respect with SR EN 378-1).
These natural alternatives: ammonia and mixtures have zero or low global
warming potential (GWP).
The theoretical study uses as reference a single stage refrigeration system
which works with R 404A. To implement the international Legislation, in the
future it is necessary to retrofit HFC refrigerants with ecological refrigerants
(with zero ODP and zero GWP).
Energy efficiency is directly related to global warming and greenhouse
gases emissions
Key words: energy efficiency, TEWI, natural refrigerants, refrigeration
system.
1. Introduction
The retrofitted single stage refrigeration system is used for chilled
products in a cold storage (0…4°C). Initial refrigeration system is composed by:
condenser, scroll compressors, evaporators, refrigerant vessel and thermostatic
valves.
∗ Corresponding author: e-mail: gratiela.tarlea@gmail.com