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Posts Tagged ‘HVAC’

July 19, 2016

DON´Ts for efficient and cost-effective heating system in a passive house!

DON´Ts when designing a heating system in a passive house: spend a lot of money on a biomass boiler or bore hole heat pump system expect that a 100% electric heating and hot water system will comply with the primary energy limit for Passivhaus certification. Excerpt from “How to build a Passivhaus: Rules of thumb”, […]...

AUTHOR: Petra Vladykova Bednarova

July 15, 2016

Tips on designing, installing and using hot water system in a passive house!

Hot water often uses more energy than heating in a Passivhaus so it pays to concentrate on designing an efficient system. Use the DHW sheet in PHPP at an early…...

AUTHOR: Petra Vladykova Bednarova

July 14, 2016

Book of the month: ASHRAE Handbook – HVAC Systems and Equipment!

A new book to add to my collection and to have something good to read has landed in my mailbox some time ago. An “ASHRAE Handbook 2016 – HVAC Systems…...

AUTHOR: Petra Vladykova Bednarova

July 11, 2016

Gas boilers, air heat pump, underfloor heating, ground source, wood stoves, and more systems to use for heating a passive house!

Gas boilers are the default heat source in the UK and can easily be used in a Passivhaus. Combi boilers provide hot water on demand, and as such have high…...

AUTHOR: Petra Vladykova Bednarova

July 7, 2016

No secret when using a heating system in a passive house!

Air heating is the defi ning method for Passivhaus, in theory minimising costs. In practice there are a lot of reasons for not using air heating: A particular room’s demand…...

AUTHOR: Petra Vladykova Bednarova

July 6, 2016

Individual performance of HVAC components versus overall HVAC system performance! Both needs to be certified!

Inspections and audits are performed to different levels in different countries, for example low-cost/ low results in some Member States (MS), more costly and thorough in others (for example in…...

AUTHOR: Petra Vladykova Bednarova

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July 5, 2016

Heating load when designig an HVAC system for a passive house!

PHPP works out an overall heat load, in terms of watts and W/m2. This gives a continuous heat load – ie, assuming the heating is on 24/7, and is aimed…...

AUTHOR: Petra Vladykova Bednarova

June 30, 2016

Heating via the fresh air supply in a passive house!

A Passivhaus building can in theory be heated via the fresh air supply – that is after it is heated to around 50°C. This idea of doing away with a…...

AUTHOR: Petra Vladykova Bednarova

June 27, 2016

Don´t just stick the ventilaiton unit in the loft and other DON´Ts for technical systems in passive house!

Don´ts for technical systems for a passive house: just stick the ventilation unit in the loft omit silencers accept shoddy ductwork installation. Excerpt from “How to build a Passivhaus: Rules…...

AUTHOR: Petra Vladykova Bednarova

June 2, 2016

Handing over, primary maintanence, commissioning, changing filters and checkups of HVAC system in a passive house!

Hand over the system with a description of the system, demonstration of how to operate the controls and how to change filters. Also provide information on where to get replacement…...

AUTHOR: Petra Vladykova Bednarova

May 26, 2016

Guidelines for designing a chilled beam system!

While every project is unique, here are some guidelines: the zone sensible cooling load is between 20 to 40 Btu/ft² average for building; the primary airflow rate should be 0.25…...

AUTHOR: Hugh Crowther