# J1P2 Performance Requirements

J1P2 Thermal Performance of Sole-Occupancy Units in Class 2 and Class 4 Buildings sets limits for heating loads, cooling loads and thermal loads, as per Specification 44. Specifically, these are set within [S44C2](#what-is-s44c2-heating-load-limit), [S44C3](#what-is-s44c2-cooling-load-limit) and [S44C4](#what-is-s44c4-thermal-energy-load-limit), where the limits of each Class 2 (sole-occupancy unit (SOU)) are established and adjusted for the total area of habitable space.

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Specification 44 - [S44C2](#what-is-s44c2-heating-load-limit) and [S44C3](#what-is-s44c3-cooling-load-limit) - must be used to calculate the heating and cooling load limit for each SOU in order to verify J1V5(1)(a) and/or J1V5(1)(b).
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## What is S44C2 - Heating load limit?

S44C2 sets the heating load limit of a space (MJ/m2.annum). It is equal to the greater of:

> *a) 4; and*
>
> *b)* $$((0.0044×HDH)−5.9)×FH$$*, where—*
>
> $$HDH$$*= the total annual heating degree hours of the building location; and*
>
> $$FH$$*= the area adjustment factor for the heating load limit, determined in accordance with Table S44C2.*

Table S44C2 outlines the area adjustment factor (FH) based on the total area of habitable rooms (AH). For rooms with an area of 50 m² or less, the adjustment factor is set at 1.37.&#x20;

When the area exceeds 50 m² but is less than or equal to 350 m², the factor is determined by the quadratic formula: ( 5.11 × 1 0 − 6 ) 𝐴 𝐻 2 − ( 3.82 × 1 0 − 3 ) 𝐴 𝐻 + 1.55.&#x20;

For rooms with an area greater than 350 m², the adjustment factor is fixed at 0.84. This table helps in adjusting calculations for energy efficiency assessments based on the size of the habitable room area.

### Table S44C2

| Total area of habitable rooms (AH) | Area adjustment factor (FH)           |
| ---------------------------------- | ------------------------------------- |
| ≤ 50 m2                            | 1.37                                  |
| > 50 m2 to ≤ 350 m2                | $$(5.11×10−6)AH2−(3.82×10−3)AH+1.55$$ |
| > 350 m2                           | 0.84                                  |

## What is S44C3 - Cooling load limit?

S44C3 sets the cooling load limit of a space (MJ/m2.annum) in accordance with the following formula:

> $$CLL=(5.4+0.00617×(CDH+1.85DGH))×FC$$
>
> $$CLL$$*= the cooling load limit (MJ/m2.annum); and*
>
> $$CDH$$*= the total annual cooling degree hours of the building location; and*
>
> $$DGH$$*= the total annual dehumidification gram hours of the building location; and*
>
> $$FC$$ *= the area adjustment factor for the cooling load limit, determined in accordance with Table S44C3.*

Table S44C3 details the area adjustment factor (FC) for different ranges of the total area of habitable rooms (AH). For areas up to 50 m², the adjustment factor is set at 1.34.&#x20;

For areas greater than 50 m² but not exceeding 200 m², the factor is calculated using the formula: ( 1.29 × 1 0 − 5 ) 𝐴 𝐻 2 − ( 5.55 × 1 0 − 3 ) 𝐴 𝐻 + 1.58. For areas between 200 m² and 1000 m², the formula ( 3.76 × 1 0 − 7 ) 𝐴 𝐻 2 − ( 7.82 × 1 0 − 4 ) 𝐴 𝐻 + 1.12  is used.&#x20;

Lastly, for areas exceeding 1000 m², the adjustment factor is fixed at 0.71. This structured approach allows for precise adjustments in energy efficiency assessments based on the size of the habitable room area.

### Table S44C3

| Total Area of Habitable Rooms (AH) | Area Adjustment Factor (FC)                 |
| ---------------------------------- | ------------------------------------------- |
| ≤ 50 m²                            | 1.34                                        |
| > 50 m² and ≤ 200 m²               | (1.29 × 10⁻⁵) AH² - (5.55 × 10⁻³) AH + 1.58 |
| > 200 m² and ≤ 1000 m²             | (3.76 × 10⁻⁷) AH² - (7.82 × 10⁻⁴) AH + 1.12 |
| > 1000 m²                          | 0.71                                        |

## What is S44C4 - Thermal energy load limit?

S44C4 sets the thermal energy load limit of a space (MJ/m2.annum), calculated in accordance with the following formula:

> *TLL = 19.3 HLL + 22.6 CLL − 8.4 / Tr + 10.74 − 15*
>
> *TLL represents the thermal energy load limit.*
>
> *HLL represents the heating load limit.*
>
> *CLL represents the cooling load limit.*
>
> *Tr represents the annual average daily outdoor temperature range.*

S44C4 calculates the thermal energy load limit (TLL) based on the heating load limit (HLL), cooling load limit (CLL), and the annual average daily outdoor temperature range (Tr).&#x20;

It combines these factors using specific coefficients and constants to determine the maximum thermal energy load that a system or building can accommodate, considering both heating and cooling needs along with outdoor temperature variations.

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S44C4 - Thermal energy load is not required for J1V5. It is only required if an independent Performance Solution is being undertaken to meet the Performance Requirement J1P2.
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