DHW usage

House Calcs		DHW			Specific heat of water :			4.185	(kJ/kgC)	Jg-1C-1
	tank temp(C)		60				or	0.00116	(Kwh/kgC)
	bath temp(C)		35			shower flow(l/m)		8	bath depth(cm)		15
	shower temp(C)		45			shower time (m)		10		length(m)	1.35
	mains temp(C)		10							width(m)	0.54
		tot vol	HW vol
	bath	80	40
	shower	50	35				Energy stored in tank to:			30	C
dishwasher		20	0						(Kwh)
	washMC		56						Tank temp
	handwash	1	0.5				tank size	60	40	60	80
							100	3.5	1.2	3.5	5.8
Avg. Annual use			#people:	2			130	4.5	1.5	4.5	7.6
	per person		household				160	5.6	1.9	5.6	9.3
	#/day	#/wk	#/wk				190	6.6	2.2	6.6	11.0
				usage(l)			220	7.7	2.6	7.7	12.8
Bath		0.5		2080			250	8.7	2.9	8.7	14.5
shower		2		7280			280	9.8	3.3	9.8	16.3
dishwash			1.5	1560			310	10.8	3.6	10.8	18.0
washMC			1	2912			340	11.9	4.0	11.9	19.8
hands	3			1095			370	12.9	4.3	12.9	21.5
other			10	520			400	14.0	4.7	14.0	23.3
	l/d/person:	22		15447
			Kwh	897.86
	Gas	6	p	£54
	Electric	11	p	£99

Monthly overview

Monthly Spread
Roof/Panel angle	30					Heating hours:			6
Panel size(tubes)	40		area:	4.5	Extra heating hours (work@home):				6
Stove output(KW)	4
HW output temp	50
(per month if not stated)	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	tots/avgs	gas cost	elec cost
Days away	0	14	2		14	4	14		2		2		52
Daytime working days	12	6	11	12	6	10	6	12	11	12	11	12	121
Heating hours/day	8.5	4.5	7.9	8.5	4.5	0.0	0.0	0.0	7.9	8.5	7.9	8.5	5.5
Heating hours	254.5	134.5	236.5	254.5	134.5	0	0	0	236.5	254.5	236.5	254.5	1996.5
Solar:
Insolation (Kwh/m2/day)	0.6	1.17	1.94	3.22	4.17	5	4.44	3.61	2.78	1.67	0.78	0.47	29.89
(from panelangle sheet (Kwh/m2/day)	0.9	2.9	2.9	2.9	4.54	4.54	4.54	2.9	2.9	2.9	0.9	0.9	33.72
Heat to panel (Kwh/day)	2.9	5.3	8.7	14.5	18.8	22.5	20.0	16.2	12.5	7.5	3.5	2.1
Heat to panel (Kwh)	123	160	266	441	571	684	608	494	381	229	107	64	4127	£248	£454
DHW usage (l)	1287	695	1203	1287	695	1118	695	1287	1203	1287	1203	1287	13246
Mains water incoming temp (C)	4	5	7	9	12	14	15	14	12	9	7	5	9.4
Water Heating requirement (Kwh)	69	36	60	61	31	47	28	54	53	61	60	67	628	£38	£69
Avg outside temp (Cam, 2006. C)	4	3.8	4.7	9.1	13.1	17.9	21.6	17.1	18	13.7	8	6.3	11.4
Space Heating avg power(whole house) (Kw)	3.9	4.0	3.7	2.8	2.0	1.0	0.3	1.1	0.9	1.8	3.0	3.3	2.3
Space Heating requirement (kwh)	993	538	875	713	269	0	0	0	213	458	710	840	5608	£336	£617
Space Heating avg power (lounge)(Kw)	2.3	2.3	2.3	1.9	1.2	0.3	0.0	0.4	0.3	1.1	2.0	2.1
Space Heating requirement (kwh)	585	309	544	484	161	0	0	0	71	280	473	534	3442	£207	£379
Stove hours (per day)	6.0	4.5	6.0	6.0	4.5	0.0	0.0	0.0	6.0	6.0	6.0	6.0
Solar provided (Kwh)	99	128	212	353	457	548	486	395	304	183	85	51	3301	£198	£363
Solar useable (Kwh)	99	128	212	353	300	47	28	54	266	183	85	51	1806	£108	£199
Solar fraction for DHW	1.43	3.52	3.53	5.75	14.88	11.70	17.20	7.34	5.73	2.98	1.42	0.76
Solar space heating (Kwh)	30	92	152	291	426	501	458	341	251	122	25	0	2689	£161	£296
Stove provided (Kwh)	730	294	682	730	294	0	0	0	682	730	682	730	5555	£333	£611
Stove fraction for heating	0.74	0.55	0.78	1.02	1.09				3.20	1.59	0.96	0.87
Boiler Provided (Kwh)	233	152	41	0	0	0	0	0	0	0	2	126	553	£33	£61
Solar fraction for heating	0.03	0.17	0.17	0.41	1.58				1.18	0.27	0.04	0.00	0.4
Heat to dump (Kwh)	0	0	0	0	0	43	116	90	130	96	25	0

CH heatloss

								u-values (W/m2.K)
									now	pre-insul	window factor		0.17
Whole house approximation								wall	0.45	1.6	avg air changes		1.2
								window	1.7	1.7	specific heat of air		0.33
								ext door	4	4
								roof	0.16	0.5
Size								floor	1.2	1.2
	Internal	External	windows	across	up			int wall	1.9
length(m)	8.22	8.83	north down					int door	4
width(m)	6.64	7.26	south down					bay roof	4
height(m)	2.4	5	north up					1st floor	2
floors	2		south up
	Area(m2)	temp diff	Heat loss(W/m2)	(pre-insul)
Wall	143	19	1020	3599
Window	24	19	783	783
Floor	55	7	458	458
Roof	55	19	166	519
total(W/K)			2428	5360
	vol (m3)
Ventialtion	262	19	3942	3942		range(Kwh)	5240	13099
				9302
			6371	W	6.4	kW	imperia:metric conversion:			0.14422	(btu.in/hf.F.ft2 -> W/mK)
									material	k(btu.in/ hr.F.ft2)	k (W/mK)	R(1/k) (imperial)	R(1/k) (mK/W)
				was:	1.32		polystyrene (cut edge)			0.25	0.038	4.00	26.32
U-values				as is:	0.45	polystyrene(smooth surface)				0.2	0.029	5.00	34.67
wall	k (W/mK)	width(m)	R(m2K/W)	plus therm bd:	0.27			brick (outer leaf)		9	0.770	0.11	1.30
thermal bd	0.024	0.035	1.46	1.46				brick (inner leaf)			0.56
inside surface			0.13	0.13				plasterboard		4.5	0.210	0.22	4.76
plaster	0.210	0.018	0.09	0.09				mortar (inner leaf)			0.880		1.14
brick	0.560	0.105	0.19	0.19			mortar (outer leaf)				0.94		1.06
rockwool	0.04	0.065	1.63	0.18				rockwool			0.04
brick	0.770	0.105	0.14	0.14				phenolic foam			0.024
outside			0.04	0.04				fibreboard			0.1
		0.293	0.45	1.32
											m2K/W
Bay roof									cavity		0.180		5.56
felt	1	0.002	0.00	0.00			external surface (wall)				0.04
plank	0.11538	0.012	0.10	0.10			internal surface (wall)				0.13
fibreboard	0.1	0.018		0.18			external surface (roof)				0.04
kingspan	0.024	0.05	2.08				internal surface (roof)				0.1
glasswool	0.04	0.13	3.25				external surface (floor)				0.04
polystyrene	0.038	0.1	2.63				internal surface (floor)				0.17
plasterboard	0.210	0.0095	0.05	0.05
			0.12	3.02	24.50
Thermal Mass
From SAP:	19	(Thermal Mass Parameter) Solid floor. maonry+dense plaster on all walls
floor	Y(W/m2K)			Thermal mass= Sum(area, addmittance(Y))/total floor area
concrete,carpet	3.2
Heatloss room by room						Total:	5509	7882
Ground temp		11
outside design temp		−1
Lounge		Tempdiff			heatloss		total
element	Area	(wholehouse)	(roomonly)	U-value	(wholehouse)	(roomonly)				room	temp	air changes
External wall	27.1	19	19	0.45	234	234				lounge	18	1.5
Bay window	6.6	19	19	1.7	212	212				kitchen	14	2
Window	2.3	19	19	1.7	73	73				hall	10	2
ext door	2.0	19	19	1.7	65	65				bog	10	1
kitchen wall	7.5	8	8	1.9	113	113				bedroom	14	1
hall wall	12.0	8	8	1.9	182	182			wookoffice		18	1.5
floor	32.9	7	7	1.2	276	276				tessoffice	18	1.5
Ceiling (office)	13.3	0	8	2	0	213				bathroom	23	2
Ceiling (to bed)	18.3	4	8	2	146	293			unusedroom		10
Bay window ceil	1.6	19	19	0.12	4	4				airing cupboard	25
	vol			coeff	1306	1665	whole	roomonly		unused nominal	10
ventilation	78.9	19	19	0.495	1114	1114	2419	2779
wookoffice
External wall(S)	6.1	19	19	0.45	52	52
External wall(W)	7.6	19	19	0.45	66	66
Window(S)	1.1	19	19	1.7	36	36
Window(W)	1.1	19	19	1.7	36	36
Door	1.5	8	8	2	23	23
T-office wall	4.3	0	8	1.9	0	66
Bed wall	8.7	4	8	1.9	66	133
Ceiling	14.2	19	19	0.16	43	43
floor	14.2	0	8	2	0	227
	vol			coeff	323	682	whole	roomonly
ventilation	32.6	19	19	0.495	460	460	783	1142
tessoffice
External wall(N)	5.1	19	19	0.45	44	44
External wall(W)	5.2	19	19	0.45	44	44
Window(W)	1.1	19	19	1.7	36	36
W-office wall	4.3	0	8	1.9	0	66
Hall wall	5.5	0	8	1.9	0	84
Ceiling	7.2	19	19	0.16	22	22
floor	7.2	0	8	2	0	115
	vol			coeff	146	410	whole	roomonly
ventilation	16.5	19	19	0.495	233	233	378	642
Bedroom
External wall(S)	6.8	15	15	0.45	46	46
External wall(E)	8.7	15	15	0.45	60	60
Window	2.3	15	15	1.7	59	59
W-office wall	9.9	−4	4	1.9	−75	75
Bathroom wall	4.0	−9	4	1.9	−68	30
Hall wall	2.3	4	4	1.9	17	17
Airing cupboard	2.3	−11	4	1.9	−48	17
Ceiling	17.9	15	15	0.16	43	43
Floor	17.9	−4	4	2	−143	143
	vol			coeff	−109	490	whole	roomonly
ventilation	41.1	15	15	0.33	305	305	196	795
Bathroom
External wall(N)	4.0	24	24	0.45	43	43
External wall(W)	6.3	24	24	0.45	68	68
Window	1.1	24	24	1.7	45	45
Bedroom wall	2.3	9	13	1.9	39	57
Hall wall	5.5	13	13	1.9	136	136
Ceiling	7.2	24	24	0.16	28	28
Floor	7.2	9	13	2	129	186
	vol			coeff	488	563	whole	roomonly
ventilation	16.5	24	24	0.66	392	392	880	955
Kitchen
External wall(N)	8.1	15	15	0.45	55	55
External wall(W)	6.5	15	15	0.45	44	44
Window	2.3	15	15	1.7	58	58
Lounge wall	8.6	−4	4	1.9	−65	65
Hall wall	6.5	4	4	1.9	49	49
Ceiling	10.3	−9	4	2	−185	82
Floor	10.3	3	3	1.2	37	37
	vol			coeff	−6	392	whole	roomonly
ventilation	24.6	15	15	0.66	366	366	360	758
Hall/Bog
External wall(N)	13.8	11	11	0.45	69	69
External wall(E)	4.5	11	11	0.45	23	23
Window	1.1	11	11	1.7	21	21
Window	1.1	11	11	1.7	21	21
Ext Door	2.0	11	11	4	86	86
Lounge wall	10.8	−8	0	1.9	−165	0
Kitchen wall	5.4	−4	0	1.9	−41	0
Ceiling(t-office)	7.0	−8	0	2	−113	0
Ceiling(Loft)	6.1	11	11	0.16	11	11
Floor	10.2	−1	−1	1.2	−12	−12
	vol			coeff	−100	218	whole	roomonly
ventilation	54.5	11	11	0.66	593	593	493	811

Tank Losses

Tank losses		heat loss coefficient for storage tank:				0.1429	Btu/hr*ft2*F
Manufacturer		Navitron	Navitron	Navitron	Navitron	Navitron	Navitron	Navitron	Navitron	Navitron	Navitron
Tank volume (l)		120	135	172	210	144	168	216	259	320	450
Tank height (mm)		1050	1200	1500	1800	1050	1200	1500	1800	1800	1800
Tank Diameter (mm)		400	400	400	400	450	450	450	450	500	550
Insulation thickness (mm)		75	75	75	75	75	75	75	75	75	75
Surface area (m2)		1.6	1.8	2.1	2.5	1.8	2.0	2.4	2.9	3.2	3.6
k-value (W/mK)		0.020	0.020	0.020	0.020	0.020	0.020	0.020	0.020	0.020	0.020
R-value (K.m2/W)		3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8
U-value (W/K.m2)		0.27	0.27	0.27	0.27	0.27	0.27	0.27	0.27	0.27	0.27
Heat loss (W) @ temp diff	90	37.69
	80	33.50	37.52	45.57	53.61	38.45	42.97	52.01	61.06	68.68	76.47
	70	29.32	32.83	39.87	46.91	33.64	37.60	45.51	53.43	60.10	66.91
	60	25.13	28.14	34.17	40.20	28.83	32.23	39.01	45.80	51.51	57.35
	50	20.94	23.45	28.48	33.50	24.03	26.86	32.51	38.16	42.93	47.80
	40	16.75	18.76	22.78	26.80	19.22	21.48	26.01	30.53	34.34	38.24
	30	12.56	14.07	17.09	20.10	14.42	16.11	19.51	22.90	25.76	28.68
	20	8.38	9.38	11.39	13.40	9.61	10.74	13.00	15.27	17.17	19.12
	10	4.19	4.69	5.70	6.70	4.81	5.37	6.50	7.63	8.59	9.56
Heatloss (kWh) @50Cdiff,hrs	12	0.25	0.28	0.34	0.40	0.29	0.32	0.39	0.46	0.52	0.57
	24	0.50	0.56	0.68	0.80	0.58	0.64	0.78	0.92	1.03	1.15
From newark sheet (50mm)	24	1.3	1.39	1.6	1.8	1.45	1.58	1.84	2.05	2.34

Gas/Leccy usage

Current Usage

Leccy

Meter 1

read/estimated

Meter 2

read/estimated

price for 1st

price

Kwh/day

£/day

Billdate

From

to

period

start

end

start

end

Meter1

Meter2

217

(rest)

cost

(ays)

(Kwh)

(Kwh)

(Kwh)

(Kwh)

Kwh

Kwh

(pence)

pence

£

2007-08-17

89

2647

r

2731

r

6920

r

7126

r

84

206

11.066

7.975

£29.83

3.26

£9.72

Gas