Air-to-water heat pump with your hands - part two
Dec 23, 2019
The cost price of a heat pump, heating costs
If necessary, an alternative to the blue fuel can be not only a solid fuel boiler with accumulator tank, but also the heat pump. Want to save on gas supply? FORUMHOUSE offers a history of the user with the nickname batt87, which heats homemade house heat pump, rather than to hold gas.
Assembly costs are independent of the system with a heat pump of 3.5 kW
T. e. cost indoor heat exchanger, without a split, about 10-15 m. p. depending on how much power you want to remove from your heat exchanger.
External power split 24K BTU can be found within 10 m. P., Universal charge to split costs 3 t. P, as a result of 15 + 10 + 3 = 28 m. P. You can collect the heat pump air / water 9 kW / h of heat, which will consume 2.5-3 kW / h.
But these data will heat when the outdoor air temperature from +5 ° C and above, if the temperature is lower, and the consumption difference and heat generation is less, so it is necessary to expect that during freezing to -5 ° C the system will operate with a coefficient 1.5-2, t. E. 2.5 kW would require from the network, give 3.5-5 kW of heat.
External power split 48K BTU can be found within 20 m. P., Universal charge to split costs 3 t. P, as a result of 15 + 20 + 3 = 38 m. P. can collect air heat pump water at 18 kW / h of heat, which would consume 5-6 kW / h.
But these data will heat when the outdoor air temperature from +5 ° C and above, if the temperature is lower, and the consumption difference and heat generation will be less need to rely on this, that at temperatures below zero to -5 ° C the system will operate with a coefficient 1.5-2, t. E. 5 kW require from the network will give 7.5-10 kW of heat.
Still a lot of money I spent on the piping heat pumps and connection with the existing heating system. But these costs are all very different, depending on the complexity and the coolness of the boiler. For example, one tap with sleeves 1 "costs about 900 rubles.
Incidentally, not difficult to alter and outdoor unit of air into the water from the well, Krasnodar year round in the well water 15 C °. Coefficient convert electricity into heat to be stable throughout the year, around 4-5 m. E. require 2.5 kW, we will get 12 kW of heat, but will be the consumption at the pump that will pump water from the well and needed water from the well to drain somewhere, may be in another well or river / lake. But according to my calculations in my case it is not very profitable, t. To. Pilot pump contributes about 2-3 kW of heat and if it will give 4 kW I just not notice.
Therefore, the heat pump water / water is as follows and 15 kW / h of heat capacity.
Why does it not make sense to carry out gas
Let's return to Gaza following simple calculations, which show that the gas connection is not profitable to me, even at normal price for the installation of gas pipes.
The main consumers of electricity in the house, it is a boiler and heating system.
Consumes have an average of 7 kW per day (myself, my wife and child 2 years): 7 kW × 30 days × 12 months × 5.38 rubles = 13600 rubles... If you use my new heat pumps for domestic hot water from April to November, I have to save at least 50% of the electricity in these months, it turns out 7300 rubles.
According to my calculations, the new pump, I'll spend on heating at 5900 rubles. per month, instead of 9500 rubles., with margin calculations, as a result, I hope, will be more economical.
5900 rubles. × 4 months. = 23600 rubles.
TOTAL: 23600 + 7300 = 30900 rubles.
Gas I would spend
7 days kW × 30 × 12 × 0.64 × Months 1,1 = 1800 rubles.
2282 kW × 4 months. × 1,1 = 10,000 rubles.
GAZ is still necessary to add maintenance 3000 rubles.
TOTAL: 10000 + 1800 + 3000 = 14800 rubles.
If the planned costs for the installation of gas 280,000 tons. P. put in the bank at 6%, we get 17,000 rubles. in year.
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And how do you think it makes sense to hold gas or better to put money in the bank?