This paper investigates how a simulated room’s energy and temperature performance are affected if its underfloor heating control is modelled with increasing detail. Experiments were performed to develop and calibrate an empirical model of wax motor and to calibrate the valve curve. These models were used to implement and test the On/Off and proportional-integral (PI) control processes at various levels of modelling detail. Controllers were implemented by gradually adding optimized control parameters, signal delay, calibrated valve curve, signal modulation, and actuator modelling. The On/Off control dead band and PI parameters exhibited the largest impact, reducing energy use (1%–5%) and temperature fluctuations (ca 1 K). Modulating the PI output signal increased temperature fluctuations to the same amplitude as On/Off with 0.5 K dead band, increasing space heating demand by 1.3%. The wax actuator counted for less than 1%; however, it increased time delays to maximally 7 min and remarkably changed the mass flows.
Parts , T M , Ferrantelli , A , Naar , H , Thalfeldt , M & Kurnitski , J 2023 , ‘ Wax actuator’s empirical model development and application to underfloor heating control with varying complexity of controller modelling detail ‘ , JOURNAL OF BUILDING PERFORMANCE SIMULATION . https://doi.org/10.1080/19401493.2023.2201818
Energy renovations of the building stock are a paramount objective of the European Union (EU) to combat climate change. A tool for renovation progress monitoring is energy performance certificate (EPC) labelling. The present study tested the effect of different EPC label classifications on a national database, which comprises ~25,000 EPC values from apartment buildings, detached houses, office buildings, and educational, commercial, and service buildings. Analysing the EPC classes labelling resulting from four different EU methods, we estimated the annual renovation rates, costs, energy savings, and CO2 emissions reduction that would affect the national building stock if each of them was adopted, to fulfil the European Climate Target Plan by the year 2033. The ISO 52003-1:2017 two-point and one-point methods determined a very uneven distribution of renovation rates, from 0.45% to ~9%. Conversely, the Directive 15% recently proposed in COM/2021/802 with uniform rates determined smaller differences and standard deviation, not pushing renovations above 3.70%, namely a rate that once fine-tuned can stimulate realistic, yet effective renovation campaigns. The major differences in renovation rates provided by the studied methods show the need for a harmonized strategy such as the Directive proposal to enable achievement of European targets.
A very short and rough comparison of two @Victory Amplifiers V4 amps, filmed with smartphones and no post processing for a (relatively) realistic effect about the live sound. It’s basically A/B-ing the relative differences of amps and pedals.
As an extra, there’s also a short test on-the-field for The Sheriff’s GREEN channel, straight into a MESA Dual Rectifier 4×12 cab, boosted only by the Bad Horse.
…and now also Quantum Arkanum is available on #Spotify, #Deezer and all the other digital distribution media 😄. This is my Yin side, dark and symbolic, dealing with Greek and Egyptian cosmogony and ancient myths such as the cult of Amun-Ra. The beginning of a long and comprehensive project. Check it out!
While my Quantum Prana music is my Yang, mostly fun and playful with progressive, funk and jazz influences, my Quantum Arkanum solo project is my Yin: the moon, dark and more Metal. Centred on #occultism, #symbolism and #hermeticism (my passions since the 90s ), this first EP deals with Egyptian cosmogony (with some references to Hesiod and ancient Greece as well).
Musically, it is built upon orchestral music, King Crimson’s “Red” era, Candlemass, Opeth and other dark stuff.
It will appear on #Spotify and other digital distribution media in about a week. In the meantime, you can listen to it on Soundcloud:
Some update about my upcoming Quantum Arkanum EP: the vocals for track #2 are now recorded. The song is heavy on symbolism and gnostic traditions, consistently with the EP’s title.
If Event Horizon https://g.co/kgs/4AB8BA is my Yang, progressive and rather bright sounding, Quantum Arkanum is my Yin, featuring dark atmospheres based on doom metal arrangements. Still quite progressive anyway, but with a different flavour.
Tracks #1 and #3 are going to be instrumental, while #2 features vocal parts and lyrics on Egyptian cosmogony and occultism. A mix of English and Ancient Greek.
Forecast for the release date: end of June/mid July. Stay tuned!
Evaluating the #energy performance of existing buildings is critical for improving the efficiency and resilience of the building stock as a whole. The importance of this information holds at different scales, both locally and at the national and international levels. A major problem arises from the difficulty in obtaining information from existing buildings; often, the only available data are the yearly consumption per unit area, typically corresponding to the energy performance certificate (EPC). This paper shows how to address concerns of practical relevance with a limited number of variables by examining an EPC national database (including the major cities of Tallinn, Pärnu, Tartu, and others) that provides only EPCs, construction/renovation year and heated area. Through a systematic statistical investigation of nearly 35 000 EPCs of educational, office, commercial and other building typologies, we i) characterise the time evolution of EPC classes, ii) evaluate the impact of incentives pre/post-renovations, and iii) create benchmarking tables that allow comparisons of a specific building with the existing stock to identify representative buildings for detailed auditing. The readiness of the Estonian building stock could thus be evaluated by linear fitting. All new and renovated buildings are estimated to achieve the zero-energy building (ZEB) status by 2050; remarkably, for some categories, this will occur already in the present decade if the identified linear trends persist. Additionally, we investigated whether the #COVID-19 pandemic has affected building stock readiness by comparing pre- and post-2020 ZEB year fit estimations. Contrary to what was expected, the change in working habits affected some building types only marginally, while the national regulations played a prominent role. Detached private houses exhibited a pronounced worsening in readiness, while the educational and entertainment sectors benefited from specific energy labelling remodulations.
Horrible. Tedious to death. An awful drag…at least it was short and the pain lasted only a week.
The story of an idiotic, spineless scientist who manages to create life (!), but then immediately rejects and abandons the creature because…it’s ugly. Then he faints, an awful number of times throughout the too many pages of this terribly self-indulgent teenager disaster. What a waste of time, really. Kenneth Branagh did an amazing job in ameliorating this story in his movie.
Victor is so irrational to never really use his brain at all, he’s all emotion and psychosis, sees something, gets scared and faints, then he falls sick, for two-three months. And he whines about how he’s pitiful, unlucky, suffering and blah blah blah. He makes idiotic choices and never faces his responsibilities, he can only blame the creature.
The book is also very illogical, and relies too much on very convenient coincidences. I’m not writing spoilers, but the story almost made me sometimes scream with desperation!
The narrative is so horribly self-indulgent that we have to read up to 4 pages of useless scenery description, which could be easily condensed in one page just for the setting. But no, you need to know the colour of the tree’s leaves in that particular season, and right when you were finally acquiring some momentum, hoping in something to happen, the rhythm is broken again. And when action happens, Victor usually faints. Then he wakes up after two months in bed, and then he whines some more. Then also the creature whines. And the ship’s captain whines too. Everybody whines, including the poor reader.
It’s incredible how such a brilliant premise, with all the influence it carried (and still carries) on literature and popular culture, including a number of undertones and legitimate questions about the power and dangers of science, got wasted on this poor execution. At least I’ve learned a new English word: “countenance”. Beware, you’ll read it a lot, REALLY an awful lot of times!
My “Mozart Medley” is now published on #Spotify and other major streaming services like #Soundcloud. These are three Mozart pieces adapted for an electric guitar ensemble (string quartet and winds), including some humour:
Symphony n.25 I movement (extract)
Eine Kleine Nachtmusik K. 525, I Allegro (extract)
Der Hölle Rache kocht in meinem Herzen, Aria (extract)
Original compositions by W. A. Mozart Rearrangement and production by Quantum Prana
Musician, theoretical physicist, and martial artist