Central Heating System for Bungalow - Heat Transfer, U-Values and Heat Loss

Central heating system of Bungalow
Prepared by,
Name:
Student Id:
Course:
1 | P a g e

Introduction
The course of action of focal warming structure for the house on the prelude of liquid stream
perspectives, for example, as material and direct confirmation and moreover warm exchanger
graph begin .The house will be warmed utilizing a 42 kW hotter with a 20 ( C temperature
refinement between the water river and outlet. This will utilized for masterminding warming
structure on the start of Heat exchange edges (Cockroft, Cowie, Samuel, 2017).
Central heating system
The most comprehensively saw kind of Heat pump is the air-source warm pump, which
exchanges warm between your home and the outside air. The present Heat pump can reduce
your vitality use for warming by around half showed up distinctively in connection to electric
affirmation warming, for example, radiators and baseboard radiators. High-reasonability
warm pumps additionally dehumidify superior to anything standard focal ventilation systems,
accomplishing less vitality utilize and the entire all the all the more cooling solace in summer
months. Air-source warm pumps have been utilized for a long time in all parts of the United
States, yet so far they have not been utilized as a bit of zones that master expanded conditions
of subfreezing temperatures.
2 | P a g e

Heat transfer
Heat exchanger is a constant flow adiabatic open framework in which two liquid s trade or
exchange warm between them without losing or growing any glow from condition or
incorporating. As indicated by constant stream vitality condition net change in enthalpy of
Heat exchanger is zero. From thermodynamics we comprehend that glow move in any
dependable weight process is equivalent to change in enthalpy of the liquid. In addition we
expect that the largeness of the hot and cold liquids stays unflinching as they go through the
glow exchanger. Solidifying in excess of two fixations it can be considered that the rate of
Heat exchange among hot and chilly liquid in any glow exchanger is equivalent to the rate of
enthalpy change of both of the liquids (Dellwig & Lipinski, 2017). The prosperity measure is
that don't utilize the relationship of condition for enrolling enthalpy change of any liquid in
the event that it is experiencing stage change like in steam improvement.
C h ange∈energy=Heat +Work + ent h al h y c h ange wit htime
∆ E=Q+W + ∑❑
open
∫
t
❑
H total dme
∆ E= ̇m1 ∆ H1+ ̇m2 ∆ H2
U-Values and Heat Loss
Section 1
Using CIBSE Guide A the thermal values of a typical construction was used in order to
determine the U-Values of 0.16 for the roof and 0.3 for the walls. Please see the below
calculations;
Wall Calculation
3 | P a g e
Brick
105mm
Blown
Fibre
Insulation
100mm
Lightweight
Aggregate
Concrete
Block
100mm
Dense
Plaster
13mm

The top values reflect the dimensions of the materials used and the bottom values are the
thermal conductivity values from table 3.47 of CIBSE Guide A. The surface and airspace
values used in the calculation where from table 3.48 of CIBSE Guide A.
4 | P a g e
Outside
Ro
Outside
Ri

Roof Calculation
The top values in the below calculation again reflect the dimensions of the materials used and
the bottom values are the thermal conductivity values from table 3.47,3.37 & 3.35 of CIBSE
Guide A. The surface and airspace values used in the calculation where from table 3.48 of
CIBSE Guide A
5 | P a g e
Outside
Ro
Inside
Ri
Clay Tiles
25mm
Ventilated
Airspace
Ventilated
Airspace
Roofing
Felt
25mm
PU
Insulation
120mm
Plasterboard
12.5mm

Section 2
The purpose of this assignment is to design the heating system by choosing either emitters,
boilers, pumps etc. for the building layout provided. The choice of system selected will be
identified within this report and all calculations and considerations will be taken into account
when doing so.
Within this report the heat loss calculations will need to be collated for all the rooms on the
first floor, this will then determine what type of emitters are required followed by the amount
of heat required for each room.
Design Considerations
U-Values;
Roof - 0.3 W/m2 oC
Floor – 0.13 W/m2 oC
Internal Partition Wall – 0.13 W/m2 oC
Exposed Wall – 0.16 W/m2 oC
Glazing – 2.1 W/m2 oC
Louvre – 2.5 W/m2 oC
Room Height 2.7m
Room Height in Corridor & Circulation Areas 2.4m
6 Air Changes per hour in Toilets
Heat Loss
Please see the heat loss calculations that have been completed by hand, this may take some
considerable time to complete depending on the size of project. You can also do the heat loss
calculations on various software packages.
There are two parts to the calculation of heat loss from any space. The fabric loss and the
ventilation loss. The fabric loss consists of all the various areas of the structure that apply to
6 | P a g e