Analiza delovanja in optimizacija komponent toplotne črpalke v sušilnem stroju

Petelin, Nada (author), Poredoš, Alojz (mentor)

V okviru magistrske naloge smo naredili eksperimentalno analizo delovanja toplotne črpalke v sušilnem stroju. Opisali smo teoretično ozadje delovanja parnega hladilnega procesa in predstavili potek preračuna lamelnega prenosnika toplote z uporabo ɛ-NTU metode. Podrobneje smo predstavili eksperimentalno progo na kateri smo izvajali meritve ter opisali posamezna merilna mesta, merilno opremo in testno proceduro. V nalogi smo izdelali posplošen numerični model za preračun lamelnega prenosnika toplote - kondenzatorja, ki nam je služil kot orodje za določanje optimalne velikosti glede na določene vhodne podatke. Predstavili smo rezultate, analiza meritev pa nam je bila v pomoč pri validaciji numeričnega modela. Glede na numerično izračunane izstopne temperature zraka in hladiva iz prenosnika toplote smo ugotovili, da lahko kondenzator zmanjšamo za 1/7 prvotne velikosti, pri tem pa toplotna moč pade za manj kot 10%. S tem smo zmanjšali površino prenosnika toplote namenjeno ohlajanju pare hladiva, ki je prvotno predstavljala 1/3 celotnega kondenzatorja, za polovico.

• Language: Slovenian
• Keywords: toplotna črpalka, sušilni stroj, parni hladilni proces, numerični model, eksperimentalna analiza, kondenzator
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-94469
• Publication date in RUL: 30.08.2017

Secondary language

• Language: English
• Title: Performance analysis and optimization of heat pumps components in tumble dryer

Abstract

In this master thesis experimental analysis of a heat pump in a tumble dryer was carried out. We described theoretical background of vapor compressor cycle and presented calculation procedure for finned tube heat exchanger based on ɛ-NTU method. Experimental system where the measurements were taking place was shown in detail, including every single measuring point, used equipment and test steps. The main goal of this thesis was to develope a numerical model of finned tube heat exchanger - a condenser. The numerical model was used to help us find an optimal condenser size, depending on given input data. Measured data and data analysis was presented with aim to use experimental results for numerical model validation. Depending on the numerically determined outlet temperatures of air and refrigerant, we found out that decreasing condenser area for 1/7 of its initial size, reduces heat power for less than 10%. With this the superheated area of the condenser, which originally presented 1/3 of overall condenser size, was reduced for one half.

• Keywords: heat pump, tumble dryer, vapor compressor cycle, numerical model, experimental analysis, condenser