Abstract
In order to achieve ambitious goals for energy efficiency and requirements for near zero energy buildings, various technological solutions enabling the use of renewable energy are proposed and applied. One such rapidly spreading technology is heat pumps. However, the use of air-to-water heat pumps in countries where the cold season is cold and humid has unfavourable conditions for the operation of this equipment during the heating season. As a result, the performance efficiency of the equipment decreases. This article presents the simulation results of an air-to-water heat pump operation in Lithuania using the TRNSYS modelling tool; its nominal heating capacity is 6.55 kW. The model was calibrated using real data obtained at Vilnius Gediminas Technical University when measurements were performed under heat pump freezing conditions. The seasonal performance factor of the heat pump heating mode was determined during the calculation. Parametric analysis of the model was also performed, when sensitivity of the model to the initial climatic data was observed. Comparable results are obtained for Vilnius, Prague and London.
Highlights
various technological solutions enabling the use of renewable energy are proposed
using real data obtained at Vilnius Gediminas Technical University when measurements were performed under heat pump freezing conditions
The seasonal performance factor of the heat pump heating mode was determined during the calcula tion
Summary
Tyrimo objektas – oro šaltinio šilumos siurblys, esantis Vilniaus Gedimino technikos universiteto Pastato ener ginių ir mikroklimato sistemų laboratorijoje. Vykdytų eksperimentų metu (2020–2021 m.) vidutinis oro srautas kito nuo 1583 m3/h iki 5298 m3/h, tiekiamo vandens temperatūra esant ga rintuvo užšalimo galimybei buvo palaikoma apie 40 °C, o grįžtamojo – apie 35 °C. – Oro šaltinio šilumos siurblys (Type917), kurio nomi nalioji šildymo galia yra 6,55 kW. – Valdikliai (Type2-AquastatH) leidžia stebėti patalpos vidaus temperatūrą, kuri gali kisti ±3 °C ribose nuo nustatytosios temperatūros, akumuliacinės talpos temperatūrą, kurioje palaikoma 40 °C temperatūra bei leidžiama taip pat jai svyruoti ±3 °C ribose. – Duomenų nuskaitymo komponentas (Type9a) leidžia modelyje panaudoti eksperimente išmatuotus duomenis: aplinkos oro temperatūra, santykinė drėgmė ir vandens, patenkančio į ŠS, temperatūra. – Suderinus modelį, Type 9a iš dalies pakeičiamas klimatinių duomenų įvesties komponentu (Type15), kai nagrinėjamas įrenginio veikimas viso šildymo sezono metu. Ats kirai dar reikia vertinti patiriamus šilumos nuostolius dėl vamzdyno izoliacijos pažeidimo trasoje, esančioje lauke
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