kaczjer's profile - activity

Carrier HAP 5.1 compliance with ASHRAE 90.1 VAV inconsistent automation Dear Sir or Madame, I am writing if HAP ver 5.1

Maybe some kind of 3-way valve? Mixing with cold water may be a waste of energy.

Thanks, do you think that VRF manufacturer can provide us necessary data?

Hi Everyone! I we prepare advisory analysis for HVAC project design in Poland. Our goal is to reduce LCC of HVAC components. We use Carrier HAP and IES.

The thing that we want to analyse is a comparison of VRF units by different providers. As example Provider A is more expencive than Provider B. Looking for ESEER, EER or COP factors Provider A is sometimes also worse. So based on such fact Provider B is reasonable solution, but based on already installed equipments the result is opposite because such factors do not show whole year operation. We want to prepare LCC analysis that can precisely compare VRF A and VRF B. The question is what data we need to obtain from providers and which software we need to use. Investment cost are of course not a problem. Additional costs as maintenance is hard to estimate and we skip them. We only want to compare energy use. Many thanks in advance!

Many thanks, The question is what parameters of VRV units should I use for comparisons. In my opinion nominal parameters

Many thanks, The question is what parameters of VRV units should I use for comparisons. In my opinion nominal parameters

OK I will answer my question, cause we solved the problem. 1. assume oppening time, example 8-16 every day 10 min per ho

Life cycle costs comparison of VRF units Hi Everyone! I we prepare advisory analysis for HVAC project design in Poland.

HAP v5.11i vs v4.91i fan energy use difference Dear Everyone I am writing to enquire about Carrier HAP v5.11i and v4.91

IES VE Peer view help Hi everyone! We are providing various kind of analysis for LEED, BREEAM and advisory purposes in

Air Curtain Modelling Technique - LEED Carrier HAP Dear Everyone I am dealing with few energy models for LEED which cont

Dear everyone. I am preparing energy modell for 4-floor office building in Poland. For modelling purpose I use CARRIER HAP software For baseline I have to model system 9 for heated only spaces. System by descrition : Warm air furnace provided by Constant Air Volume AHU + Fossil fuel furnace. Our building uses remote hot water from municipal hot water grid so I choose Remote Source Water Plant and hot water as a source of heat.

The problem is which system type should I choose? I saw somewhere template for system 9 and it was modelled as Equipment Type: Split AHU Air System Type CAV Single Zone

But in our modell we have multiply spaces each floor which we have to supply, so Single Zone isn`t good.

My last choose was CAV - 2 Deck Multizone but I am not sure about that case and I can`t modell humidification for those system

Thank You in advice for any help ! Przemylaw Rejczak Polish Code Energy Certification Assessor

Hi

I am modeling in eQuest 7-floor office building in Poland. This will be used for LEED certification.

I have a big problem with air flow sizing for each zone.

Most rooms are provided with CAV (constant air volume) with heating and cooling coils prowered by hot/chilled water loop and there are

4-pipe fancoils which helps with conditioning. Chilled water is produced in chilers and hot water is produced in heat exchanger which gets heat from municipal heating grid.

For proposed building I have modeled one big (for few floors) and few small ( per one floor) fancoils system (with heating/cooling coils)

which get Outside Air from "Constant Volume Single zone with Reheat" system. Each CAVs powers one Dummy zone.I set termostat schedules, so they equals to temperatures which CAVs supplies in cooling and heating mode.

I set air flow volume (CFM) and kW/cfm for CAV, defatul values for fans in fan coil systems and loads for both.

I set fan (0/1) schedule for systems, termostat and design T cool/heat schedules for all zones.

At first I started in DD wizzard but mainly work was done in Detailed Mode.

In results I got lots of unmet hours and the energy consumption (gas) is overkilling. The problem I think, is connected with adjusting properly airflow to each zone. For some zones I have 0 unmets but an overkilling airflow.

For the rest zones factor of cfm/sf is 0.1 and there I have lots of unmets. I saw in project that before calculations airflow is already assigned for each zone. I supposed that Wizzard did it for me, but these are bad sized values.

After deleting it I got ennormous flow for each zone and lots of cooling unmets(all year for each zone). The same problem is in Baseline model. I have no idea how to deal with this problem.

Thanks in advance

Przemysław Rejczak