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1 | initial version |
You can indeed approximate heating and cooling loads (losses) by doing a manual calculation, but know that this won't be very accurate since you'll be missing a lot of parameters (for example solar heat gains, radiation, latent loads...).
Anyways, your basic loads are as follows:
- Envelope losses - from floors, walls, ceilings and windows - that can be calculated using q = UA.dT
.
- Infiltration losses, which basic equation is the sensible heat equation q = cp.ρ.Q.dT
(where Q is the volumetric airflow rate m3/s, cp is the specific heat capacity of air)
- Potential ventilation loads (same basic equation as infiltration)
It's always very useful to know those basic equations by heart, so that you can double check any more complicated model (such as a modeling software) outputs. For example, double checking the heating and cooling energy consumption of a dedicated outside air system (DOAS) is really easy using heating and cooling degree days: using a very basic dimensional analysis you can figure out how you're supposed to plug the heating degree days in there to derive kWh/year (I can help if you want).
I suggest you read up Chapter 17 and 18 of the ASHRAE Handbook of Fundamentals (they are on a four year cycle so anything like 2009, 2013), and you can also see the Manual J calculations from from ACCA.
2 | No.2 Revision |
You can indeed approximate heating and cooling loads (losses) by doing a manual calculation, but know that this won't be very accurate since you'll be missing a lot of parameters (for example solar heat gains, radiation, latent loads...).
Anyways, your basic loads are as follows:
- follows:
q = UA.dTU.A.dT
q = cp.ρ.Q.dT
(where Q is the volumetric airflow rate m3/s, cp is the specific heat capacity of It's always very useful to know those basic equations by heart, so that you can double check any more complicated model (such as a modeling software) outputs. For example, double checking the heating and cooling energy consumption of a dedicated outside air system (DOAS) is really easy using heating and cooling degree days: using a very basic dimensional analysis you can figure out how you're supposed to plug the heating degree days in there to derive kWh/year (I can help (this end of post if you want).can't figure it out).
I suggest you read up Chapter 17 and 18 of the ASHRAE Handbook of Fundamentals (they are on a four year cycle so anything like 2009, 2013), and you can also see the Manual J calculations from from ACCA.
! Dimensional analysis
3 | No.3 Revision |
You can indeed approximate heating and cooling loads (losses) by doing a manual calculation, but know that this won't be very accurate since you'll be missing a lot of parameters (for example solar heat gains, radiation, latent loads...).
Anyways, your basic loads are as follows:
q = U.A.dTUA.dT
q = cp.ρ.Q.dT
(where Q is the volumetric airflow rate m3/s, cp is the specific heat capacity of It's always very useful to know those basic equations by heart, so that you can double check any more complicated model (such as a modeling software) outputs. For example, double checking the heating and cooling energy consumption of a dedicated outside air system (DOAS) is really easy using heating and cooling degree days: using a very basic dimensional analysis you can figure out how you're supposed to plug the heating degree days in there to derive kWh/year (this end of post (I can help if you can't figure it out).want).
I suggest you read up Chapter 17 and 18 of the ASHRAE Handbook of Fundamentals (they are on a four year cycle so anything like 2009, 2013), and you can also see the Manual J calculations from from ACCA.
! Dimensional analysis
4 | No.4 Revision |
You can indeed approximate heating and cooling loads (losses) by doing a manual calculation, but know that this won't be very accurate since you'll be missing a lot of parameters (for example solar heat gains, radiation, latent loads...).
Anyways, your basic loads are as follows:
- follows:
q = UA.dT
q = cp.ρ.Q.dT
(where Q is the volumetric airflow rate m3/s, cp is the specific heat capacity of It's always very useful to know those basic equations by heart, so that you can double check any more complicated model (such as a modeling software) outputs. For example, double checking the heating and cooling energy consumption of a dedicated outside air system (DOAS) is really easy using heating and cooling degree days: using a very basic dimensional analysis you can figure out how you're supposed to plug the heating degree days in there to derive kWh/year (I can help if you want).
I suggest you read up Chapter 17 and 18 of the ASHRAE Handbook of Fundamentals (they are on a four year cycle so anything like 2009, 2013), and you can also see the Manual J calculations from from ACCA.
5 | No.5 Revision |
You can indeed approximate heating and cooling loads (losses) by doing a manual calculation, but know that this won't be very accurate since you'll be missing a lot of parameters (for example solar heat gains, radiation, latent loads...).
Anyways, your basic loads are as follows:
q = UA.dT
.q = cp.ρ.Q.dT
(where Q is the volumetric airflow rate m3/s, cp is the specific heat capacity of air)It's always very useful to know those basic equations by heart, so that you can double check any more complicated model (such as a modeling software) outputs. For example, double checking the heating and cooling energy consumption of a constant volume dedicated outside air system (DOAS) is really easy using heating and cooling degree days: using a very basic dimensional analysis you can figure out how you're supposed to plug the heating degree days in there to derive kWh/year (I can help if you want).want). It's also a perfect application since it should be fairly accurate.
I suggest you read up Chapter 17 and 18 of the ASHRAE Handbook of Fundamentals (they are on a four year cycle so anything like 2009, 2013), and you can also see the Manual J calculations from from ACCA.
6 | No.6 Revision |
You can indeed approximate heating and cooling loads (losses) by doing a manual calculation, but know that this won't be very accurate since you'll be missing a lot of parameters (for example solar heat gains, radiation, latent loads...).
Anyways, your basic loads are as follows:
q = UA.dT
.q = cp.ρ.Q.dT
(where Q is the volumetric airflow rate m3/s, cp is the specific heat capacity of air)It's always very useful to know those basic equations by heart, so that you can double check any more complicated model (such as a modeling software) outputs. For example, double checking the heating and cooling energy consumption of constant volume dedicated outside air system (DOAS) is really easy using heating and cooling degree days: using a very basic dimensional analysis you can figure out how you're supposed to plug the heating degree days in there to derive kWh/year (I can help if you want). It's also a perfect application since it should be fairly accurate.
I suggest you read up Chapter 17 and 18 of the ASHRAE Handbook of Fundamentals (they are on a four year cycle so anything like 2009, 2013), and you can also see the Manual J calculations from from ACCA.
7 | No.7 Revision |
You can indeed approximate heating and cooling loads (losses) by doing a manual calculation, but know that this won't be very accurate since you'll be missing a lot of parameters (for example solar heat gains, radiation, latent loads...).
Anyways, your basic loads are as follows:
q = UA.dT
.q = cp.ρ.Q.dT
(where Q is the volumetric airflow rate m3/s, cp is the specific heat capacity of air)It's always very useful to know those basic equations by heart, so that you can double check any more complicated model (such as a modeling software) outputs. For example, double checking the heating and cooling energy consumption of constant volume dedicated outside air system (DOAS) is really easy using heating and cooling degree days: using a very basic dimensional analysis you can figure out how you're supposed to plug the heating degree days in there to derive kWh/year (I can help if you want). It's also a perfect application since it should be fairly accurate.
I suggest you read up Chapter 17 and 18 of the ASHRAE Handbook of Fundamentals (they are on a four year cycle so anything like 2009, 2013), and you can also see the Manual J calculations from from ACCA.