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    ANALYSIS OF HEAT PUMPS WITH ZEOTROPIC REFRIGERANT MIXTURES BY TAGUCHI METHOD
    (Turkish Soc Thermal Sciences Technology, 2010) Comakli, Omer; Comakli, Kemal; Ozdemir, Nesrin; Yilmaz, Mehmet
    The goal of this work is to determine the optimum set of parameters by using the Taguchi method in vapour compression heat pump systems. The experimental apparatus consist of an air-to-liquid vapor compression heat pump, a water cooled condenser, a forced air evaporator, an electrical air and water heaters, and various measuring elements and other auxiliary equipments. Refrigerants R22, R407C, and five of their binary mixtures which contain about 0%, 25%, 50%, 75%, and 100% mass fractions of R407C were tested. To determine the effect of the chosen parameters on the system and optimum working conditions, an experimental design method suggested by Genichi Taguchi was used. The most effective parameters are found to be the condenser water mass flow rate for the coefficient of performance and to be condenser water inlet temperature for the exergetic efficiency.
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    Analysis of heat pumps with zeotropic refrigerant mixtures by Taguchi method
    (2010) Comakli, Ömer; Comakli, Kemal; Özdemir, Nesrin; Yılmaz, Mehmet
    Bu çalışmanın amacı Taguchi metodu kullanarak buhar sıkıştırmalı ısı pompası sistemlerinin optimum çalışma parametrelerini belirlemektir. Deney sistemi; su soğutmalı kondenser, zorlanmış hava soğutmalı evoparator, hava ve su ısıtıcıları, çeşitli ölçüm cihazları ve yardımcı ekipmanları içeren ısı pompası sisteminden oluşmaktadır. Soğutucu akışkan olarak R22, R407C ve bunların kütlesel olarak beş faklı (0%, 25%, 50%, 75%, 100% R407C ) karışımı kullanılmıştır. Etkin ve optimum çalışma parametrelerini hesaplamak için Genichi Taguchi tarafından önerilen deneysel yöntem kullanılmıştır. Performans katsayısı için en etkin parametre kondenser su debisi, ekserji verimi için en etkin parametre kondenser suyu giriş sıcaklığı olarak bulunmuştur.
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    ENERGETIC AND EXERGETIC COMPARISON OF AIR TO AIR AND AIR TO WATER HEAT PUMPS ACCORDING TO EVAPORATOR CONDITIONS
    (Univ Malaysia Pahang, 2013) Comakli, Kemal; UgurCakir; Sahin, Erol; Kus, Aysegul Cokgez
    This paper presents an experimental energetic and exergetic comparison for a heat pump system that can be run in different modes as air to air and air to water. Components of the heat pump do not change when the running mode changes, except for the condenser. This means that some external and internal effects (like compressor type, pipe lines) that can affect the system performance will be the same for each running mode. The comparison which was made in this study demonstrates which system leads to an efficient conversion and supply of energy and exergy. In the analysis, four balance (mass, energy, entropy and exergy) equations are applied to the system for the two modes. Exergy and energy efficiency values for both systems are given, while exergy destructions in each of the systems are determined and presented. It is seen that the heat pump unit which has the highest COP value is the air to air type (3.45-3.8); second is the air to water type (3.35-3.41). The exergy efficiency of the air to air heat pump (29-32%) is higher than the exergy efficiency of the air to water type heat pump (24.1-25). Ranking of the exergy destruction rates of the two heat pump types from high to low is as follows: air to air and air to water.