scholarly journals The effect of the HVAC system on the energy consumption of various insulated lightframe buildings

2016 ◽  
Vol 64 (1) ◽  
pp. 29
Author(s):  
Zoltán HANTOS ◽  
Zsolt KARÁCSONYI
Keyword(s):  
Energy Consumption ◽  
Hvac System

<p class="p1">A szerzők egy könnyűszerkezetes lakóházat vizsgáltak három különböző hőszigeteltségi fokozattal és három különböző, fatüzelésen alapuló épületgépészeti rendszerrel kiépítve. A vizsgálatok eredménye hétköznapi ismeretekkel is feltételezhető, hiszen mind a szigetelések vastagságának, mind az épületgépészeti rendszer hatásfokának növelésével egyaránt csökkenthető az épület energiafelhasználása. Tényleges értékekkel azonban elsőként mutathatjuk be, hogy mekkora fogyasztáscsökkentést eredményez a komolyabb hőszigetelés, vagy egy modern napkollektoros, hővisszanyerővel kombinált fűtési rendszer a Magyarországon megvalósítható fa bordavázas épületek esetében. A cikkben bemutatott kilenc épület mindegyike teljesíti a 176/2008. (VI. 30.) Korm. rendelet A+ energetikai besorolását, de a leggyengébb és a legjobb közötti több mint kétszeres energiafelhasználási mutatóval. Az épületek a korszerű fa bordavázas épületek energiafogyasztás-csökkentésének lehetséges fokozataiként értelmezhetők.</p>

Energy Efficiency and Tracking Performance Evaluation for Dual-Mode Model Predictive Control of HVAC Systems

2018 ◽  
Vol 10 (4) ◽  
Author(s):  
Zicheng Cai ◽  
Asad A. Ul Haq ◽  
Michael E. Cholette ◽  
Dragan Djurdjanovic
Keyword(s):  
Energy Consumption ◽  
Predictive Control ◽  
Pid Control ◽  
Control Structure ◽  
Tracking Performance ◽  
System Control ◽  
Hvac System ◽  
Dual Mode ◽  
Different Types ◽  
Predictive Controller

This paper presents evaluation of the energy consumption and tracking performance associated with the use of a recently introduced dual-mode model predictive controller (DMMPC) for control of a heating, ventilation, and air conditioning (HVAC) system. The study was conducted using detailed simulations of an HVAC system, which included a multizone air loop, a water loop, and a chiller. Energy consumption and tracking performance are computed from the simulations and evaluated in the presence of different types and magnitudes of noise and disturbances. Performance of the DMMPC is compared with a baseline proportional-integral-derivative (PID) control structure commonly used for HVAC system control, and this comparison showed clear and consistent superiority of the DMMPC.

scholarly journals Lessons learned from recommissioning a public office building

2018 ◽  
Vol 175 ◽  
pp. 04029
Author(s):  
Yuyang Miao ◽  
Chenggang Liu ◽  
Xinjiang Huang
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Water System ◽  
Lessons Learned ◽  
Hot Water ◽  
Office Building ◽  
Hvac System ◽  
Public Office ◽  
Control Scheme ◽  
Actual Energy Consumption

Energy consumption of HVAC system play a big role on the whole building energy usage. Recommissioning on HVAC system can improve build comfort and its performance. Taking the recommissioning of public office as an example, the issue of the energy consumption of HVAC system was found, control scheme of chilled and hot water system and AHUs was optimized, the new energy saving control scheme was determined, and the actual energy consumption was analysed. The result show that recommissioning for the public office building achieved obviously effect, and the rate of energy saving is 18%, 33% and 10% for chilled water, hot water and electricity, respectively.

Experimental Study of PCM Inclusion in Different Building Envelopes

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
C. Castellón ◽  
A. Castell ◽  
M. Medrano ◽  
I. Martorell ◽  
L. F. Cabeza
Keyword(s):  
Energy Consumption ◽  
Phase Change Materials ◽  
Energy Savings ◽  
Construction Materials ◽  
Temperature Oscillation ◽  
Heat Pumps ◽  
Hvac System ◽  
Small House ◽  
Trombe Wall ◽  
Insulation Effect

The main objective of this paper is to demonstrate experimentally that it is possible to improve the thermal comfort and reduce the energy consumption of a building without substantial increase in the weight of the construction materials with the inclusion of phase change materials (PCM). PCM are a suitable and promising technology for this application. This paper presents an experimental setup to test PCM with various typical insulation and construction materials in real conditions in Puigverd de Lleida (Lleida, Spain). Nine small house-sized cubicles were constructed: two with concrete, five with conventional brick, and two with alveolar brick. PCM was added in one cubicle of each typology. For each type of construction specific experiments were done. In all cubicles, free-floating temperature experiments were performed to determine the benefits of using PCM. A Trombe wall was added in both concrete cubicles and its influence was investigated. All brick cubicles were equipped with domestic heat pumps as Heating, Ventilation, and Air Conditioning (HVAC) system; therefore, the energy consumption was registered, providing real information about the energy savings. Results were very good for the concrete cubicles, since temperature oscillation were reduced by up to 4°C through the use of PCM and also peak temperatures in the PCM cubicle were shifted in later hours. In the brick cubicles, the energy consumption of the HVAC system in summer was reduced by using PCM for set points higher than 20°C. During winter an insulation effect of the PCM is observed, keeping the temperatures of the cubicles warmer, especially during the cold hours of the day.

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