Discover and read the best of Twitter Threads about #HVAC

Most recents (14)

@prlambert @energysmartwv @curious_founder One per room is way too many. They’re not small enough and the turndown isn’t low enough for that.
@prlambert @energysmartwv @curious_founder We usually do ducted #heatpumps for the whole house in our #HVAC design projects. When people come to us wanting all #ductless units, we try to talk them into ducted for the bedrooms.
@prlambert @energysmartwv @curious_founder Here's an example from a small high-performance house we did in Virginia.

Loads (in BTU/hr)

Bedroom 1
htg = 1,944
clg = 320

Bedroom 2
htg = 1,454
clg = 511

Study
htg = 1,665
clg = 1,063
Read 7 tweets
CROONICLE: Essential Tips to Create a Successful Online Local... croonicle.com/2022/01/create… #listingsite
CROONICLE: Effective Ways to Stop Your Sugar Cravings croonicle.com/2022/01/effect… #sugarcravings #sweettooth
CROONICLE: Step-by-Step Guide When Looking for a Wedding Phot... croonicle.com/2022/01/guide-… #weddingphotography
Read 36 tweets
Long🧵on the provisions of #BuildBackBetter on all things #electricity & #grid. The act starts w/ ~3bn in loans for electric co-ops @NRECANews, incl. projects w/ #batteries. Co-ops have been very involved in @ENERGY-funded R&D & are now enabled to bring results to practice! 1/
It is funny that in my postdoc work @CMU_ECE & @NRECANews w/ @eeregov funding, we actually studied the added value of #battery to #photovoltaics for residential customers' energy cost savings: energy.gov/eere/solar/pro… & [1],[3], [4] here panay1ot1s.com/publications-s… 2/
Another ~10bn to co-ops for loans until 2031 to improve #resilience & #reliability w/ investments in #renewables & #transmission . Co-ops 'own' transmission lines & this money can motivate adjacent upgrades. Also critical that #renewables & #transmission appear together here! 3/
Read 23 tweets
Live: International dream team of air quality experts talking about how we're not doing enough to prevent #delta transmission in schools
Worst-case scenario: Children's hospitals overloaded with 1/3th the beds needed, and 1/5th the PICU beds needed
Delta primarily spreads through #aerosol inhalation. The 6-ft rule is insufficient. The 15-min rule is insufficient. If someone must eat indoors, they should not talk. The infectious person does not have to be in the room at the same time as you
Read 24 tweets
The Concord project opted to go with Solar (PV) connected to an energy storage system (battery storage) in lieu of a backup generator.

This system has been designed to keep the critical loads for the home operational even if the utility power is knocked out.
This includes the backup heating and domestic hot water system (gas boiler with radiant floor heat + indirect hot water tank), the refrigerator, freezer, microwave, TV/WiFi, lighting and receptacles in strategic areas.
The Generac PwrCell provides 18 kWh of battery storage in a single cabinet, and up to 9 kW of continuous power output, enough to power the critical loads for extended periods of time. It can also be expanded to 36 kWh of battery storage in the future should it ever be needed.
Read 7 tweets
A metal ion orients SARS-CoV-2 mRNA to ensure accurate 2′-O methylation of its first nucleotide
» doi.org/10.1038/s41467…
The #SARSCoV2 #coronavirus is able to utilize the changes in metal ion concentrations to disguise itself in the human host body thus evading immune responses. Image
Efficacy of #clarithromycin on #COVID19 pneumonia without oxygen administration; protocol for multicenter, open-label, randomized-controlled, 3-armed parallel group comparison, exploratory trial #CAMECOVID
» doi.org/10.1101/2021.0…
Japan Registry of Clinical Trials jRCTs071210011 Image
The influence of #HLA genotype on the severity of #COVID19 infection
» doi.org/10.1111/tan.14…
A genetic link has been discovered explaining why some people catch #Covid but don't get sick. The gene is found three times as often in people who are #asymptomatic. Image
Read 199 tweets
🔝5 Concerns about #SARSCoV2 #Biology: A Call to Pause, Deliberate, and Revise Policy─This review is intended both as a basic resource and to initiate an open and critical dialog about SARS-CoV-2 biology for an independent and public call to action. jjcouey.medium.com/5-concerns-abo…
Structural basis of ribosomal #frameshifting during translation of the #SARSCoV2 #RNA #genome
» doi.org/10.1126/scienc…
A unique feature of the SARS-CoV-2 genome controls protein synthesis and presents an "Achilles heel" of the virus. Image
Brainstem neuropathology in two cases of #COVID19: #SARSCoV2 trafficking between #brain and #lung
» doi.org/10.1007/s00415…
Neuropathologic evidence strongly suggests that the pathophysiology of COVID-19 related respiratory failure includes a neurogenic component. Image
Read 213 tweets
🔺3k workers (20-69 yrs) perished in #CdnPoli pandemic @CPHO_Canada. Hard to get good official #OSH info . Using #ONpoli @WSIB injury reports & PHU data from
@TOPublicHealth &
covid-19.ontario.ca
to estimate where fatalities might b . #TOpoli #PaidLeave #SickPlan #COVIDZero Image
#Pandemic #ONpoli work hotspots inc warehouse, transport, health, #OntEd, manu, construction, stores & offices. Adj fatalities for #excessdeath as per @MoriartyLab . #DayOfMourning @FredHahnCUPE @HarveyBischof @ETFOpresident @aefopresidence @OECTAProv @SharleenStewart @FolkDawson Image
Read 40 tweets
Il Dito E La Luna─Indossare la #mascherina all'aperto se non s'è a stretto contatto con estranei NON è indispensabile (il dito). Viceversa, predisporre opportuni impianti #HVAC con filtrazione #Heat#UVC#HEPA è IMPRESCINDIBILE (la Luna). Mind Your Head Image
Il Dito E La Luna─Indossare la #mascherina all'aperto se non s'è a stretto contatto con estranei NON è indispensabile (il dito). Viceversa, predisporre opportuni impianti #HVAC con filtrazione #Heat#UVC#HEPA è IMPRESCINDIBILE (la Luna). Mind Your Head
Il Dito E La Luna─Indossare la #mascherina all'aperto se non s'è a stretto contatto con estranei NON è indispensabile (il dito). Viceversa, predisporre opportuni impianti #HVAC con filtrazione #Heat#UVC#HEPA è IMPRESCINDIBILE (la Luna). Mind Your Head
Read 3 tweets
Bilancio di un anno su Twitter, reso possibile grazie a Paolo Barnard. Abbiamo contribuito a sollevare ragionevoli dubbi, nel bene e nel male, facendo chiarezza su:

✔️Wuhan WIV twitter.com/i/events/12546…
✔️Idrossiclorochina twitter.com/i/events/12688…
✔️Vaccini twitter.com/i/events/13521… Image
COV2: E GLI AEROSOL INFETTIVI?
In Italia non ci dicono se è possibile o meno contrarre il CoV2 dal semplice respiro di un portatore sano CHE RIMANE a galleggiare nell'aria ANCHE DOPO il suo passaggio, e persino viaggia a distanza. Fatti per POTER PREVENIRE.
CoV2: IL NEW YORK TIMES CONFERMA IL MIO VIDEO
Il New York Times ha pubblicato, 7 giorni dopo il mio video sugli #aerosol infettivi, una conferma di ciò che dissi perché ora lo dice anche il CDC del governo americano. No panico, MA PRENDERE LE PRECAUZIONI.
Read 54 tweets
Whole building system metric needs to be done to improve energy efficiency, but comes with some challenges.

Dr. Bing Liu @nwalliance
#SummerStudy20
Total System Performance Ratio (TSPR) evaluates the ENTIRE #HVAC system & can be calculated by:
#BuildingSystems Image
Free software is available to improve whole building analysis, thanks @eeregov !

buildingenergyscore.energy.gov
Read 5 tweets
Clear need to increase interdisciplinary knowledge on #HVAC, #building, #smartcities &&& working across diverse groups — Adam Jacobs from Optimal Energy

#BuildingTrades #SummerStudy20 Image
Some quick thoughts:
US construction is male & white; leading to systemic & intergenerational siphoning of contracts, social relationships & $$$$

Diversity & anti-racist policies need to implemented in bidding & contractors
Existing efforts at Municipal, State, & Federal seek to do ALL the things: gender equity & racial equity --->
Read 7 tweets
Daily Bookmarks to GAVNet 7/12/2020-2

greeneracresvaluenetwork.wordpress.com/2020/07/12/dai…

How Futurists Cope With Uncertainty | by Amy Webb | The Startup | Medium

medium.com/swlh/how-futur…

#uncertainty
Covid-19 and climate change: Why we need to remember what we’ve lost - Vox

vox.com/energy-and-env…

#COVID19 #ClimateChange #TippingPoint
Can HVAC guidance help prevent transmission of COVID-19? | McKinsey

mckinsey.com/industries/adv…

#transmission #COVID19 #coronavirus #hvac
Read 3 tweets
This is pretty interesting. The article lays out an existing intellectual divide or siloization between medical professionals/researchers (& the engineers working w/ them) vs aerosol scientists (& the engineers working w/ them). 1/

#covid19 #masks

wired.com/story/how-mask…
When I first started reviewing the research on influenza to evaluate the potential for developing a tool to estimate risk of infection reductions via ventilation, filtration, etc., I got some pushback. Engineers steeped in hospital/healthcare design told me... 2/
influenza wasn’t airborne, or at least not enough to present any real threat. Which contradicted what was being said in the aerosol research literature.

So I had the opportunity to experience this intellectual divide first hand. 3/
Read 5 tweets

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