Heat Transfer Coefficients of the HTL2-ISO
Report by Ingenieursbureau Post en Dekker B.V. for Hörmann Alkmaar B.V.
Project Details
| Researching Party | Ingenieursbureau Post en Dekker B.V. Grasweg 41A 1031 HW, Amsterdam |
| Product Owner | Hörmann Alkmaar B.V. Robbenkoog 20 1822 BB Alkmaar |
| Object Code | 10950 |
| Product Description | Charging bridge technology in conjunction with insulation technology for reduced energy losses during and outside of operation. |
Scope of Analysis
Analysis of the insulation performance of the HTL2-ISO platform using the thermal conductivity model in combination with data from a heat loss test. This defines a simplified, unified heat transfer coefficient (U) for each available variant of the HTL2-ISO charging bridge. Only the surface of the HTL2-ISO is considered; other heat losses from the environment are not taken into account.
Method
The thermal conductivity model is applied to calculate uniform heat transfer coefficients (U) per length and lip length variant of the HTL2-ISO. Width deviations are not presented as they have only a minor impact on the heat transfer coefficient and are considered within the tolerance. Convective heat loss, caused by leaks in the interstitial spaces, is compensated by a constant heat loss (QLeak), estimated from data from a heat loss test.
Passive State U per Length Variant
All U-values are calculated in the passive state of the charging bridge with the lip retracted. All U-values are subject to a tolerance of ± 0.2 when tested under similar conditions.
| Length (mm) | 2000 | 2500 | 2750 | 3000 |
| U (W/m²K) | 2.8 | 2.5 | 2.4 | 2.3 |
Active State U: Length vs. Lip Length
All U-values are calculated in the active state of the charging bridge with the lip extended. All U-values are subject to a tolerance of ± 0.2 when tested under similar conditions.
| Lip length (mm) | Length (mm) | |||
| 2000 | 2500 | 2750 | 3000 | |
| U (W/m²K) | 2.6 | 2.4 | 2.3 | 2.2 |
| 650 | 2.4 | n.v. | n.v. | n.v. |
| 950 | n.v. | 2.1 | 2.0 | 2.0 |
| 1150 | ||||
Analysis Notes
All published values are based on estimates and a heat loss test under stable conditions, and apply only to charging bridges. Fluctuations in atmospheric pressure, conductivity, ventilation, or leaks at locations other than the charging bridge are not considered.
The method for this heat transfer analysis was approved and executed by Post en Dekker B.V. ✔️
