Mathematical Analysis of Optimal Operating Conditions in Heating Systems

Table 5

Electricity costs, fuel costs, and operation costs under different operating conditions.

Number	Flow Rate	Water Supply Temperature	Water Return Temperature	Indoor Temperature	Power Consumption	Electricity Costs	Fuel Costs	Operating Costs
	m^3/h	°C	°C	°C	kWh	$	$	$
1	0.606	67.13	65.90	18.65	0.120	0.0104	0.0126	0.0230
2	0.629	67.11	65.92	18.65	0.128	0.0111	0.0126	0.0238
3	0.670	67.07	65.96	18.65	0.130	0.0113	0.0126	0.0239
4	0.710	67.04	65.99	18.65	0.125	0.0109	0.0126	0.0235
5	0.755	67.01	66.02	18.65	0.130	0.0113	0.0126	0.0239
6	0.810	66.97	66.06	18.65	0.136	0.0118	0.0125	0.0243
7	0.866	66.95	66.08	18.65	0.150	0.0130	0.0127	0.0258
8	0.955	66.91	66.12	18.65	0.168	0.0146	0.0128	0.0273
9	1.040	66.87	66.16	18.65	0.184	0.0160	0.0125	0.0284
10	1.172	66.83	66.20	18.65	0.217	0.0189	0.0125	0.0314
11	1.194	66.83	66.20	18.65	0.196	0.0170	0.0127	0.0297
12	1.235	66.82	66.21	18.65	0.249	0.0216	0.0127	0.0343
13	1.276	66.81	66.22	18.65	0.163	0.0141	0.0127	0.0269
14	1.280	66.81	66.22	18.65	0.206	0.0179	0.0128	0.0306
15	1.294	66.80	66.23	18.65	0.212	0.0184	0.0125	0.0309
16	1.321	66.80	66.23	18.65	0.236	0.0205	0.0127	0.0332
17	1.371	66.79	66.24	18.65	0.225	0.0195	0.0127	0.0323